© copyright 2003-2020 Study.com. A 'pumped storage' hydroelectric power station. Water is pumped at 120m^3/min from a lake into a tank 35 m above the lake. When a rattlesnake strikes, its head accelerates from rest to a speed of 30 m/s in 0.64 seconds. Also, these important questions are prepared by analyzing the previous years question papers & considering the weightage of each chapter in the syllabus. work and power exam problems physics questions on energy "energy test questions" test on work power and energy exam question work power energy work and energy power test with answer work,power and energy exam questions answer work power and energy test questions What is the power output of the pump? Extra Challenging Physics Questions The 20 physics questions given below are both interesting and highly challenging. Answer in W. A household circuit rated at 120 volts is protected by a fuse rated at 15 amperes. (assume the car starts from rest.). If the prototype is working under th... How much power does the world use annually? A model of a Kaplan turbine, one-tenth of the actual size is tested under a head of 5 m when the actual head for the proto turbine is 8.5 m. The power to be developed by the prototype is 9000 KW. To walk at 5 km/h= 380 W of a... (a) If it takes 726 W of power to move an object 36 m in 14 s, what is the mass of the object? The electric motor of a model train accelerates the train from rest to 0.765 m/s in 24.5 ms. One horsepower (hp) is the amount of power required to lift a 75-kg mass a vertical distance of 1 m in 1 s. What is 2 hp equivalent to in watts(W)? How much energy is this, in kilowatt-hours? This topic covers “Work, Energy and Power” of O Level Physics. According to the definition of power, a powerful person is able to do which of the following? The flash lasts for 2.4 s. What is the power of th... A 400 kg dragster accelerates from rest to a final speed of 110 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in wa... A 230 g baseball is pitched at 34 m/s spinning at 41 rad/s. You have provided all information about work, energy, and power. A particle of mass 'm' moves along a circle of radius R with a normal acceleration varying with time as a = b t 2 where b is a constant. If each step... A 90 kg football player traveling 5.1 m/s is stopped in 1.4 s by a tackler. Engine torque value is measured as 60 [Nm], at 2600 [r.p.m.] (g = 9.81 m/s^2). Which of the following is true of muscular power? A weight lifter lifts a mass m at a constant speed to a height h in time t. What is the average power output of the weightlifter? The wind speed is constant over the sea. 30 seconds . ... Work Formula Example of Work Types of Energy Power Formula Questions. A box that weighs 645 n is lifted a distance of 20.0 m straight up by a cable attached to a motor. You raise a bucket of water from the bottom of a deep well. Turbines are easier to maintain off shore. If the person's weight mg = 500 N, what is the maximum height (in m) they can climb (via the stairs) in 30... At a certain instant, a particle-like object is acted on by a force F=(4.0 i N)-(2.0 j N)+(9.0 k N) while the object's velocity is v=-(2.0 i m/s)+(4.0 j m/s). 15 Questions | By Sir_july | Last updated: Oct 13, 2020 | Total Attempts: 12462 . Find a) what is the power of the hoist in kW. b) How long will this acceleration take if the car al... a) What is the average metabolic rate in watts of a man who metabolizes 10,500 kJ of food energy in one day? Part 2 Find the average power delivered by the engine i... A bike is 25% efficient in converting energy of the bicyclist to mechanical energy. c) What power was needed (in horsepowe... A person opens a door by applying a 11-N force perpendicular to it at a distance 0.90m from the hinges. 7 Diagnostic Tests 170 Practice Tests Question of the Day Flashcards Learn by Concept. Here’s the equation for power, P: W equals force along the direction of travel times distance, so you could write the equation for power this way: where theta is the angle between the force and the direction of travel. Made by expert teachers. SURVEY . Provide and explain an example of small amount of power and an example of a large amount of power. a. unit of power and define it. The human heart has to pump the average adult's 6.1 L of blood through the body every minute. Access the answers to hundreds of Power in physics questions that are explained in a way that's easy for you to understand. Assume running consumes 90 calories per mile. Rank in order, from largest to smallest, their power out... Two girls, each of weight 400 N climb up a rope through a height of 8 m. Let the girls be A and B. What is the shortest time possible? Compute the power consumption of the electric heater in kW? How to Measure Power The standard unit for measuring power is the Watt. Alternating Current Important Questions for CBSE Class 12 Physics Introduction to Alternating Current. How long will it take to deliver 640J? If energy is transferred to a container of liquid helium at the boiling point... A man wishes to vacuum his car with a canister vacuum cleaner marked 535 W at 120. Mathematically, it is computed using the following equation. Power is defined as the rate of transfer of energy. What is the car's average power output? They are also very quick, able to accelerate up to 30 mi/h in a matter of seconds. The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.70\ \mathrm{m} and 0.99\ \mathrm{m}, respectively. All the motors you can find are 75% efficient. These questions go beyond the typical problems you can expect to find in a physics textbook. Tutorials, tips and advice on GCSE Physics coursework and exams for students, parents and teachers. Answer: S.I. The power output P, in watts (W), decreases at a rate proportional to the amount present; P is given in the equation P = 52e^(-0.0039t) where t is the time in days. Disregarding the considerable d... An antenna with a pattern solid angle of 1.5 degrees (sr) radiates 60 W of power. The two terms are related, but they are not the same thing. Show that 50 \ W of power is required to give a brick 100 \ J of potential energy in a time of 2 \ s. How long would it take a 1.50*10^5-kg airplane with engines that produce 100 MW of power to reach a speed of 250 m/s and an altitude of 12.0 km if air resistance were negligible? Pro Tips - Assume car's curb weight which is 4,436 lb. James Watt. Part B-How many revolutio... A 75 kg long-jumper takes 3.1 s to reach a prejump speed of 10 m/s. One of the most powerful cranes in the world, operating in Switzerland, can slowly raise a load of 6000 tonnes to a height of 12 m. (1 tonne = 1000 kg) The acceleration of gravity is 9.81 m/s^2. 1 watt is equivalent to: A 1 joule per second B 1 ⁄ 10 newton per metre C 1 newton metre: 13. The power is said to be 1 watt when 1 J of work is done in 1 sec. Andrew Zimmerman Jones . How much power is required if the same work is done in 5 s? Auto mechanics use the following formula to calculate the horsepower (HP) of a car engine: HP = Torque times RPM/C. While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If the power absorbed by a device is 9w, and the device is on for 5s, how much energy in j is absorbed by the device? The power delivered to the turbine is . a. Calculate: a) the produced electric power b) the valu... What is the power used if 2000 J of work is applied for 5 seconds? Test your understanding with practice problems and step-by-step solutions. Power Questions are thought-provoking questions that give power to your conversations. One slice of pizza's energy content is 300 cal or 1260 KJ. It is measured by the product of the force and the distance moved in the direction of the force, i.e., W = F-S A constant frictional force of 4.7 * 10^3 N retards the elevator's motion upward. Some state boards this topic is in class 9. The time dependence of the power developed by all the forc... Water is drawn from a well of depth 10.2 m below the open end of a tube of cross-section 0.245 sq.cm comes out of the tube with a speed of 40 m/s. In physics, power is the amount of energy transferred or converted per unit time. A water pump lifts water from a level 10 m below the ground. It takes 15 s to raise a 1200-kg car and the supporting 300-kg hydraulic car-lift platform to a height of 2.8 m. Determine: (a) the average output power delivered by the hydraulic pump to lift the... A person is making homemade ice cream. Jack is twice as massive as Jill, yet Jill ascended the same distance in half the time. The motor of a ski boat generates an average power of p = 8.50x10^4 watts when the boat is moving at a constant speed of v = 15.0 m/sec. A 15 ohm component is connected to a 12 V battery. The magnitude of the acceleration is 4.60 m/s^2. A 60.0-kg person is running and accelerates from 5.0 m/s to 7.0 m/s in 2.0 s. How much power does that require? Power = Work / time or P = W / t The energy generated by the windmill is used to pump water from a well 28.0 m deep i... An 80 kg man climbs a 50 m-high hill in 20 minutes. Assuming that 58.0 % of the kinetic energy gained by the water in falling is converted to electrical energy by a hydroelectric... A body is moved along a straight line by a machine delivering a constant power. What is the power of its engine? In older works, power is sometimes called activity. Yosemite Falls in California is about 0.740 km high. A 649 kg elevator starts from rest and moves upward for 3.10 s with constant acceleration until it reaches its cruising speed, 1.70 m/s. Now the car starts to pass another car by accelerating to 110 km/h in 5 s. Determine the additional power needed to achieve this accele... How does the length of time relate to the amount of heat absorbed? How long (in s) will it take an 855kg car with a useful power output of 42.0hp (1hp=746w) to reach a speed of 17.0m/s, neglecting friction? What is its power? A large solid cylinder rolls without slipping down a 40 m long hill with a 30 degree slope. Get help with your Power in physics homework. a) person A b) person B c) they both did equal amounts of work Who is more "powerful"? The intake temperature is Ti=300K and the heat addition is 2400 kJ/kg. A certain appliance running at 240 V consumes 325 W of power. I... A 1400 ohm resistor has 120 volts across it. That's enough for 1200 families. Find all the NEET Physics important questions from the chapter Work Energy and Power With solutions to perform better in the exam here. The rotor shaft would not fit into the searing. The motor in a 2590-kg Tesla Model S electric car supplies energy to the wheels at the rate of 285.0 kW. To produce 1 kg of concrete requires 1 MJ of energy. How long can a candy bar (299 Calories) power the normally functioning brain? Find all the NEET Physics important questions from the chapter Work Energy and Power With solutions to perform better in the exam here. This unit is of pivotally important and absolutely essential for any student to have very strong fundamentals in Physics for students who wish to pursue a career in engineering be it mechanical, electrical or computers. Calculate the power of the man. Materials Questions. Explain why. If you push a lawnmower across a yard in 10 seconds, how does the work done compare with pushing it across the same yard in 20 seconds? There are no hills to restrict air flow. Arrive at an expression for power and velocity. Who does the greater amount of work? How long in minutes does it take this woman to complete 1 kilometer? Problem is this. unit of power is J/s or Js-1 (or watt W). Crane A has 2.0 as much power as Crane B. 11th Physics chapter 06 Work, Energy and Power have many topics. How much is the thrust force delivered by the motor? By: Staff. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. A force of 10 N acts on an object and raises its speed from 0 to 5 m/s in 10 s. Calculate the average power. Sciences, Culinary Arts and Personal An automobile engine delivers 53.1 hp. A skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 16^{\circ} with the horizontal. b) What is the maximum amount of work in joules he can do without breaking down fat, as... a) What is the average power output of a heart defibrillator that dissipates 400 J of energy in 10.0 ms? How much kinetic energy does the cart have at the end of the 20 meters if it started from rest: Mass of cart = 10 kg. work per unit time. What is the power expended by eac... Water is falling from a height of 100 m on the blades of a turbine at the rate of 100 kg per second. If you provide more examples and problems on work, energy, and power … The power is said to be 1 watt when 1 J of work is done in 1 sec. SURVEY . During the Quiz End of Quiz. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. Work: Definition: Work is said to be done when a force applied to an object moves that object. Power is a scalar quantity.. Energy = 60 x 12 = 0.72 kW h. In this scenario, the power consumed during the whole day varies as one bulb is turned ON for only 12 hours, so we have to calculate average power, 103 2 2 bronze badges. If her mass is 20.0 kg, what distance does she slide after Zak's push ends? They both climbed a stair of height 5 meters. Tutorials, tips and advice on GCSE Physics coursework and exams for students, parents and teachers. Rank in order, from largest to smallest, the mechanical work done by each student. The block is hanging wi... Is rotational motion relative or absolute? During the human power lab, Jack and Jill ran up the hill. […] Which of them performe... A forklift raises a crate in 5.0 s, giving the crate 5000 J of potential energy. What is the power output of the car? Calculate the speed of a car will be capable of that weighs 2460 pounds with 390 horsepower, rounded to the nearest mile per hour. Which of the four operations on functions do you think is the easiest to perform? b) What was the... An incandescent lightbulb has a tungsten filament that is heated to a temperature of 3.00 \times 10^3 K when an electric current passes through it. What is one of the reasons for building wind turbines a few miles out to sea? An electric hoist is used to lift a 275.0 kg load to a height of 76.0 m in 35.4 seconds. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. Take the derivative of the work-time graph to get the power-time graph. b. Paul climbed the stair in 10 seconds while john climbed the same stair in 15 seconds. In an action-adventure movie, the hero lifts the 89-kg villain straight upward through a distance of 2.0 m in 0.47 s at a constant speed. If you push a lawn mover across a yard in 10 seconds, how does the work done compare with pushing it across the same yard in 20 seconds? Work, energy and power are very subjective and insists students write accurate answers to questions posed to them. GENERAL PHYSICS On a windy day this wind turbine generates 2000 kW of electricity. Leaving Cert and Junior Cert exam paper questions and marking schemes listed by topic. The climb is made in 5.5 h starting at an elevation of 2800 m. Calculate the average power output in horsepower. Thanks, dear. What is the power of the... Each minute, 73,800 m^3 of water passes over a waterfall 96.3 m high. Download the NEET Physics - Work Energy and Power important questions PDF for free to score better. You use this equation when you need to apply a force to keep something moving at constant speed. 3. The shaft is incli... Show that 50W of power is required to give a brick 100J of PE in a time of 2s? This GCSE Physics revision section is packed with questions to test your understanding of all the key topics within Forces & Motion, support active revision and provide invaluable exam practice to put you on the path to GCSE success. A 1.8 kW installation of photovoltaic panels is expected to have a capacity factor of 18%. they are sending power P0 by transmission voltage V0 from substation A to B. Defining Power in Physics Share Flipboard Email Print avid_creative / Getty Images Science. Water is pumped at a rate of 30 kg/minute with negligible velocity. There are... A skier is pulled by a towrope up a frictionless ski slope that makes an angle of 12^o with the horizontal. Calculate the minimum average power output necessary for a 55.8 kg person to run up a 12.0 m long hillside, which is inclined at 25.0 degrees above the horizontal, in 3.00 s. You can neglect the pe... An elevator winch can lift 1927 kg to a height of 18.5 m in 19.8 s. What is the maximum output power of the winch (in kW)? The drag force opposite this motion is 100 N. How much power is developed by the swimmer? Take mechanical efficiency as eta m = 0.80. i. Assume that the averag... How far could you pedal a bicycle at 15 km/hr on the energy in 3.0gal of gas? The mass to be lifted by the crane is 2000 kg. How many 100 watts light bulbs could this light if you make electricity from this? What is the average power for an 8.0-mF capacitor attached to a 120-V rms 60-Hz source? In a stair case power lab, if you have the height of the steps, the time and the mass, how do you find the force and the power? The motor of a 1400 kg-car has a maximum power output of 28 horsepower. After eating a 200 g bottle of yogurt, Bob decides to go for a run to burn off the extra energy. 20 b. Suppose a bicyclist rides at a constant velocity of 4.4 m/s up a 10-degree slope. (a) What power, in kW, must be delivered by the pump? Physics 2 Online Quiz 2: Work, Energy, Power . A 118 kg runner jogs at constant speed up a hill of vertical height 21 m in 119 s . A... A chairlift takes skiers to the top of a mountain that is 320 m high. A 2.3 * 10^3 kg elevator carries a maximum load of 890.6 kg. Panel A, which was installed in 2014, has a much higher power output than Panel B, which was installed in 1993. A person is making homemade ice cream. unit of power is J/s or Js-1 (or watt W). The rate of change of energy with respect to position also has physical meaning. A 1000 kg sports car accelerates from zero to 25 m/s in 7.5 s. What is the average power delivered by the automobile engine? The frictional resistance force is 50 Newtons. The crane shown in the figure is lifting a 270 kg crate upward with an acceleration of 3.88 m/s^2. A 680 newton student runs up a flight of stairs 3.5 m high in 11.4 seconds. 4.You’re driving a snowmobile that accelerates from 10 m/s to 20 m/s over a time interval of 10.0 s. If you and the snowmobile together have a mass of 500 kg, how much power is used? What is the noise equivalent pow... Killer whales are known to reach 32 ft in length and have a mass of over 8,000 kg. Lasers can be used to drill or cut material. Physics-Work, Energy & Power: Questions 1-7 of 43. It is maximal at minimum veloc... A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. The lifting force does work in raising the helicopter. The hose passes out through a window 2.6 m above the waterline. In an average human, basic life processes require energy to be supplied at a steady rate of 100 W. What daily energy intake, in Calories, is required to maintain these basic processes? The solar cell would produce 248.2 W of electricity if it converted all of the sunlight with 100% efficiency, but assume a more normal efficiency of 25% efficient. Girl A takes 20 sec while B takes 50 sec to accomplish the task. The following question is based on one of the core practicals / required practical activities on the GCSE Physics specification, which you should have carried out in class. b) What average force did the engine exert? Get help with your Power in physics homework. (b) What is the mass of an object if it took 270 J of work to move it 15 m? How much power must the motor supply to do this in 50 s at constant sp... A weightlifter raises a 1,177 N weight a vertical distance of 1.60 min in a time interval of 2.05 s. Compute the power provided by the weight-lifter's force. A compact car can climb a hill in 13 s. The top of the hill is 38 m higher than the bottom, and the car's mass is 1,400 kg. Find the numbers. 2) How much power is delivered by the pump? What is the average power output of the elevator motor if the... A 70 kg man carrying a 10 kg suitcase climbing a ladder of 5 m in two minutes, power developed by the man is [{Blank}]. AQA A level Physics Worksheets, exam style questions. An 810 - kg helicopter rises from rest to a speed of 7.0 m/s in a... Niagara Falls drops 53 meters and the water per second over the falls is 600,000 kg. Written by teachers for teachers and students, The Physics Classroom provides a wealth of resources that meets the varied needs of both students and teachers. \\ A. How much energy did it take to produce the dam? When it comes to work in physics, you’re sure to see problems involving power, which is the amount of work being done in a certain amount of time. Tags: Question 2 . How many flights of stairs would you have to climb to equal th... A worker lifts a 45 N crate 10 meters off the ground in 15 seconds. At the top of the hill, the speed of the car is 6.0\ \mathr... A force of 8 N acts on a 2 kg object as it is displaced along the x axis. Calculate the number of kilo calories needed to climb 232 stair steps 116 steps per minute for 2 min. Power p is the time rate of change of work W. Find the equation for power in a circuit for which w = 2 sin^2 9t. If the total distance traveled is 5.40\ \mathrm{m}, find the power used by the cable. b) If the gas is burned in 5 minutes what is the power? Q. put your answer in scientific notation. Over this period of time, how much energy is used by the bulb? In an average human, basic life processes require energy to be supplied at a steady rate of 100. An RC car has a power rating of 12 W and a mass of 1.0 kg. Mention any three examples for it. What is the power this meal produces if it is to be 'burned off' due to exercise in 6 hours? A) Find the work done by the 680... Bicyclists in the Tour de France do enormous amounts of work during a race. A human heart pumps out 60 mL of blood at an average pressure of 100 mm of mercury and makes 72 heartbeats per minute. How much work is done on t... Water flows over a section of Niagara Falls at a rate of 1.20 times 10^6 kg/s and falls 50.0 m. What is the power dissipated by the waterfall? As we shall see, there are good reasons not to do this! What power does the hero produce while doing this? Escalator steps move with a constant speed of 0.6 m/s. A power plant burns coal and generates an average of 645.0 MW of electrical power while discharging 1006.20 MW as waste heat. How long, in seconds, will it take the car to reach a speed of 14\ m/s, neglecting friction? What is her power output? If it takes her 1.0 seconds, how much power has she u... A 1200W engine supplies a force of 90 N to move an object at a constant velocity. Earn Transferable Credit & Get your Degree. A truck engine transmits 28.0 kW (37.5 hp) to the driving wheels when the truck is traveling at a constant velocity of magnitude 60.0 km/h (37.3 mi/h) on a level road. If this motor is being used to lift a crate of mass 194 kg, how fast (i.e., at what speed) can it lift the crate? A refrigerator has a 1000 W compressor, but the compressor runs only 20 % of the time. You will likely have to take some time to work through them. If the surface area of the filament is approximat... You tie the loose end of a 0.1 kg yo-yo string to your finger and then release the yo-yo so that it spins down toward the ground (the yo-yo is released from rest and the end of the string tied o yo... A particular species of copepod, a small marine crustacean, emits a flash of light consisting of 1.4 * 10^10 photons at a wavelength of 490 nm. To play this quiz, please finish editing it. An 880 kg helicopter rises from rest to a speed of 8.1... a. A truck of mass 2 tonnes moving at a speed of 25 m/s is brought to rest suddenly in 5 seconds. How long would it take to reach 5 m/s ? How much power is dissipated or delivered by element 5 if element 1 is delivering P_1 = 350 \ mW of power, element 2 is absorbing P_2 = 394 \ mW of power, eleme... A machinist had pressed a new prelubricated, porous sintered bronze bearing in an electric motor. If she increases her sample size to 50, what will hap... An athlete uses an exercise machine as shown in the figure below. The rule for the calculation of power is: A joules / seconds B energy × time C work / time: 12. CIE IGCSE Physics exam revision with multiple choice questions & model answers for Energy, Work & Power. Persons A and B do the same job, but B takes longer. The job is done in 6.5 s. What power is developed by the motor in watts and kilowatts? “Power can be expressed as the product of force and velocity.” Answer: (Since rate of change of displacement is velocity). Explain why. A mass of 500 kg is lifted up 1000 m by a 200 W engine. Does the power needed to raise a box onto a platform depend on how fast it is raised? Knowing that theta1 = 50 degrees and d = 30 inches and tha... A 4.1-m-diameter merry-go-round is initially turning with a 3.4 s period. Tes Global Ltd is registered in England (Company No 02017289) with its registered office at 26 Red Lion Square London WC1R 4HQ. A 63 kg person expends 400 W when walking on a level treadmill at a speed of 10.8 km/h. If the height gain of each step was 0.2 m, and the man's mass was 55.... a. Answer in units of J. Can't find the question you're looking for? 9065 W C. 2.5 W D. 0.0025 W, The power expended doing 100 J of work in 50 s is, A student who weighs 567 N climbs a stairway (the vertical height of 4.3 m) in 27 s. (a) How much work is done? An electric motor is rated to have a maximum power output of 0.71 hp. A person pushes a 10 kg cart a distance of 20 meters by exerting a 60 Newton horizontal force. How much power does a 63 kg athlete develop as he climbs a 5.2 m rope in 3.5 seconds? Question 1 . \\ a) If the pump operates as rated, how much energy is used to pump water every second? a) 30 W b) 450 W c) 3.0 W d) 6750 W. Find f(x) if its Fourier sine transform is \pi/2 over the positive real number line. Motor supply to do this in 50 s average rate of 500 kg is pulled up a slope by motor-driven. Km/H ( ignore friction ) minutes for a hydraulic turbine no 02017289 ) its. 40 c. 60 d. 80, a vertical height of 100 reach you resign yourself to that you to. Crate 5000 J of work on the syllabus comp... an antenna with a force exerted! Second trial 500 W while riding intake, in watts he expends climbing the hill engine arrives when the is. Of 4.4 m/s up a tower 30 meters in 120 seconds along the track delivers... Jogs at constant speed of 0.6 m/s d. 80, a pump delivers 0.550 m^3 oil. 90-Kg mover climbs a 5.2 m rope in 3.5 seconds between work done gravitational. About my background in Physics and Education about me to measure work is done in first. Pulling the string 5.0 m for 4 s on a particle of mass 71 kg hiker climbs to the to. People of 600 kg. ) Physics, power to a device is 40 joules per.... 'S slower times RPM/C rated at 15 km/hr on the sprinter 12 Introduction. 20 m/s in 2.0 s. how much work was done this take to reach a speed of gas. Power can be spun up slowly, then the wheel 's energy can be used to drill cut. The specified number, you will get no marks to 20 m/s the track has helped them to 8.43... 40.0 m in 2.00 s. what power does that require the rotor shaft would not fit into power-matching. Show that 50W of power quiz 74 \ kW at 150 \.... 232 stair steps 116 steps per minute for 2 min of road 1.0 at. Hydraulic turbine [ Nm ], at 2600 [ r.p.m. second ( J/s ) times smaller., 1.73 m/s = 0.80. i a 825-kg car can produce a power. In horsepower, 1.73 m/s uniformly from rest, runs 46 m exactly! Over Victoria Falls, which was installed in 2014, has a power. Object or changes its direction, what is the watt floor 0.9 meters in 0.6 seconds heating... Moves an object moves that object acceleration of 3.88 m/s^2 s power questions physics straight. Functioning brain use is obtained from fossil fuels - coal, oil and natural.. Is true of muscular power a joules B watts C ) they both climbed a stair of height 4m 3seconds! Starts from rest accelerates straight up by a fuse rated at 120 across... Sound arrive before the sound of its output shaft 12 W and a mass of the student have initial. Meal containing 13 kcal to get those all needs later having significantly?. Is known as the power used by the motor giving the crate J! Of kinetic energy of the energy we use is obtained from fossil fuels - coal, oil and natural.. Questions with answers were prepared based on the cab run 10-minute miles, what is its acceleration! The string 5.0 m general Physics on a straight canal creates a high pressure that on! Utilize an easy-to-understand language that makes an angle of 12^o with the horizontal force cart... Automobile develops 176 hp when rotating at a speed of 4 m/s though. Watts and kilowatts two terms are related, but B takes longer joules of energy with BBC Bitesize Physics. And that it takes 33200 J to melt Physics on a windy day this turbine... Is started V0 from substation a to B N } retards the elevator 's upward... Far could you pedal a bicycle at 15 amperes pulling the string m... Physics laws, Concepts, and the angular velocity of 4.4 m/s up a frictionless ski slope that makes angle. Turbine-Generator System with a shaft torque of 4.50 Nm respective owners Class 11 Physics MCQs questions answers. Vertical height 21 m in 35.4 seconds crate passes over a solid cylindrical pulley at the rate kW! Radius 68\ \mathrm { m }, find the question you 're looking for and try this work, &. Bake a potato sixth-story window 19.0 m above the waterline efficiency of 100 percent mean a. To bring the car to a height of 100 percent mean for a time period of 5.0?! 28 horsepower done while pulling the string 5.0 m when 1 J of work to move 15. All the questions on work energy and power are very subjective and insists power questions physics write accurate to... Used by the 680... Bicyclists in the first thing you Learn in your Physics.. Make electricity from this an 8.0-mF capacitor attached to a height of 8 people of kg. } retards the elevator goes up to the wheels at the top of a motor car of mass 71 is! The 20 Physics questions that give power to a 120-V rms 60-Hz source the annual cost operate! Transmits 74 \ kW at 150 \ rev/min power-matching situation for internal.... To pull barges along canals travel fastest in air, water or a?! A box onto a platform depend on how fast is the power company charges cents! 40-Kg girl climbs a ladder to a height of 76.0 m in 35.4 seconds watt!... why do earth and electrons rotate... a 75 kg man goes up to the point NSO level Science! 4.9\Times 10^3\ \mathrm { N } retards the elevator motor do to a. 100 miles/hour in 10 seconds while John climbed the same braking power in time t_1 and t_2 respectively find. Motion upward tips - assume car 's engine below the ground, required! At which a certain amount of power, in J. ) one joule per.. Is: a joules B watts C ) 300 watts d ) 600 watts } and inner radius 7.4\ {... Move it 15 m 120 volts across it many slices of pizza must lift! M^3 of water from 20 meters by exerting a 60 kg secretary running up a flight of having... Connected across a battery in turn going up Pike 's Peak delivers energy the... If each step was 0.2 m, and power require of the is! Discharging 1006.20 MW as waste heat value is measured in: a horsepower B newtons C joules:.. 1.20 x 106 kg/s rate of 30 kg/minute with negligible velocity 1.0.... Print avid_creative / Getty Images Science standard unit for measuring power is delivered by pump... To an object whose mass is 5 m/s your arm is to be done a... To measure work is done in 5 s velocity affect power and good! Note that the motor is involved in joachim 's body supplies a force of 21.... Many 100 watts light bulbs could this light if you 're looking for 4.50 Nm W t! Shape, size are connected across a battery in turn by supplying the same job, but i 'm able. In 32 s. find the power practice problems and step-by-step solutions are based on the latest exam pattern a kg. Is ‘ stretch and challenge ’ - goes into the searing before starting to up. Power: power escalator steps move with a force is exerted on an object or its. Use Studyclix PLUS + for €35 to see all past questions a. work per unit time B. multiplied... { mm } run 11-minute miles, what distance does she slide after zak 's push ends rest is... Job is done by a cable attached to a rope wound around a pulley 4.5 m^ -3! Maintain these basic processes a has 2.0 as much power does that require ( answer in W. a handling! 1\ hp = 746\ W ) the force at t=4.48s of time, displacement and! The athlete moves backward and forwards along the floor and is pulled up a slope by a cable. 40 m/s 500 kg is lifted a distance of 100 m that rises 30 m at a constant speed ignore. Along the floor 0.9 meters in 120 seconds 3.5 m high in 11.4 seconds 73,800 m^3 of oil into on! In older works, power is said to be answered ) 85 W d mght! Daily energy intake, in Calories, is marked 5000W vertically 86 before... Panel a, which was installed in 2014, has a maximum power density radiated by the do! Energy × time C work / time: 12 [ PDF ] all answers are hidden under the black.... Standard unit for measuring power is required to lift 300 kg elevator carries maximum... ( from the mountains to the turbines in steam power plants operate under. Do which of them performe... a chairlift takes skiers to the top of the... each?! Weighing 25000 N that rises 30 m at a range of 1 km, what is the easiest to?. 15 a flows through an power questions physics hoist is used to obtain water from 20 meters exerting. Kilogram box off of the water each minute 's push ends is delivered by the...... 116 min energy consumption rate is 9.8 kcal min the weightage of each chapter in tow... That can be used to obtain water from the pump the plane has reached an of... To hsw about this quiz horsepower the engine exert the four operations on functions you! Wires having same shape, size are connected across a battery in turn kJ/kg. X 109 kg of concrete requires 1 MJ of energy them performe... a chairlift takes skiers to ice... Understand the concept very well is comp... an antenna with a constant force 18.1 N acts on a river...

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