Find the total electrical energy generated by the plant in a 30-day per... A block slides down a frictionless ramp. A light bulb that supplies 40 watts of power for 500 seconds has done how much work? (a) What is the average power of the elevator motor during t... Air moving at 10.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and has an efficiency of 26.5%. 10,000 W c. 2005 W d. 1995 W. Your physics teacher drives an ideal frictionless car of mass 1000 \ kg which coasts along the level road to his home at a constant speed of 48 \ km/h with the engine turned off. In 39.0, s , a pump delivers 549, dm^3 of oil into barrels on a platform 22.0, m above the pump intake pipe. It is measured by the product of the force and the distance moved in the direction of the force, i.e., W = F-S Made by expert teachers. The rope moves parallel to the slope with a constant speed of 1.0 \ m/s. The student takes 8.5 seconds to run up the same flight of stairs during a second trial. Assume that 65% of the resist... A school counselor randomly selects a sample of 30 students to investigate the impact of a behavior intervention on their academic performance. Believe it or not, the laws of physics apply to towing! An automobile engine delivers 53.1 hp. It is maximal at approximately 2/3 maximal isometric force production. a) If electricity costs 0.12 dollars/kWh, what is the monthly (30-day) cost of running the refrigerator? Find a) what is the power of the hoist in kW. How much work could be performed by a 4476 W (6 hp) motor in 2 hours? Upgrade. The frictional resistance force is 50 Newtons. 3.A 120-kg linebacker accelerates from 5.0 m/s to 10.0 m/s in 1.0 s. How much power does that require? If this motor is being used to lift a crate of mass 192 kg, how fast (i.e., at what speed) can it lift the crate? 1 watt is equivalent to: A 1 joule per second B 1 ⁄ 10 newton per metre C 1 newton metre: 13. A refrigerator has a 1000 W compressor, but the compressor runs only 20 % of the time. A car accelerates uniformly from rest to 18.4 m per s in 4.36 s along a level stretch of road. The acceleration due to gravity is 9.8 m/s2. Question 59: Justify the statement. Studyclix makes exam revision and study easier . What is the useful output power of the hoist? Hint: Assume... A 2000-watt motor working at full capacity can vertically lift a 400-newton weight at a constant speed of {Blank}. What is the power required to keep the boat moving at a steady speed? a. The total mass of the train is 875 g. Find the average power delivered to the train during the accelerat... You are testing a new car in a wind-tunnel for road and wind resistance. Can't find the question you're looking for? For example, the average power per kilogram generated by seven-time-winner Lance Armstrong (m = 75.0 kg) is 6.50 W per ki... How long would it take a 1200 W heater to melt 1.00 kg of ice at -12.0 degrees Celsius, assuming all the energy from the heater is absorbed by the ice? Water is pumped at a rate of 30 kg/minute with negligible velocity. Extra Challenging Physics Questions The 20 physics questions given below are both interesting and highly challenging. object traveling at 90 mph. What is his power output? During the Quiz End of Quiz. The heating value of a Gas is 39MJm^{-3}. Water flows approx. The pulley... An elevator lifts 4 people each with an average mass of 72 kg to a height of 20 meters in one minute. a) person A b) person B c) they both did equal amounts of work Who is more "powerful"? 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. The climb is made in 5 hours starting at an elevation of 2200 m. a) What was the work done by the hiker against gravity? What is Work, Energy and Power? Take the derivative of the work-time graph to get the power-time graph. 15 Questions | By Sir_july | Last updated: Oct 13, 2020 | Total Attempts: 12462 . What average power does this require of the runner? The hoover dam produces 2 x 109 W of electricity. The flash lasts for 2.4 s. What is the power o... You are cycling up a hill, rising 5 feet for every 100 feet you move along the road. It slows down and stops in 18 s. Part A-Before slowing, what is the speed of a child on the rim? P = W/t: Unit 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. A constant frictional force of 4.7 * 10^3 N retards the elevator's motion upward. Calculate the minimum horsepower of the motor to b... A man is pulling a rope at a constant speed of 10 m/s with a power of 500 joules/s. Calculate the minimum horsepower the engine should have to do this. The cylinder then rolls a short distance over level ground and then off a 20 meter high sheer cliff. At speed of 90.0 km/h, you have found that 74.0 % of the total output power of an automobile engine is used in overcoming th... A 1.00 \times 10 W electric motor is used to life a 955 kg object vertically 25.0 m at a constant velocity. A particle of mass m 0.3 kg is acted upon by a force so that its position vector, r t 2.0 t 2 i 5.0 t 2 j t 2 k where t is in s. What is the instantaneous power delivered by this force to the parti... A car of 900 kg accelerates uniformly from rest to a speed of 30 m/s in 15 seconds. Auto mechanics use the following formula to calculate the horsepower (HP) of a car engine: HP = Torque times RPM/C. The crane shown in the figure is lifting a 270 kg crate upward with an acceleration of 3.88 m/s^2. One such laser generates a series of high-intensity pulses rather than continuous beams of light. A skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 16^{\circ} with the horizontal. The 20 physics questions given below are both interesting and highly challenging. The change in the kinetic energy of the block is 100 joule/s. What average power is required for a runner with a mass of 80 kg to reach a speed of 8.2 m/s during a time of 1.8 s? 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. Revise GCSE/IGCSEs and A-levels! 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? Quiz: Work and Power. b) If the gas is burned in 5 minutes what is the power? 2000 J c. 3000 J d. 4000 J. Answer in units of s. The average wind speed at a height of 80 m over the North Sea is estimated to be about 9 m/s. 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. (All numb... 1. How much energy is expended per second? A truck of mass 2 tonnes moving at a speed of 25 m/s is brought to rest suddenly in 5 seconds. A 1.10 x 10^3 kg car accelerates from rest for a time period of 5.0 sec. Paul and John have the same mass of 50 kg. Two minutes later, the plane has reached an altitude of 300 meters and its airspeed has dropped to 90 km/hr. - size - standard error - alpha level - population standard deviation - sample size - beta error, When naturally occurring conversations are observed, about % turns out to be gossip. Get help with your Power in physics homework. Neglecting air friction, what is his power output? Answer: S.I. Formula: The formula for power is. What daily energy intake, in Calories, is required to maintain these basic processes? Pepper pulls a 20.0 kg object along the floor accelerating at 2 m/s/s, and \mu = .2. 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. The human heart has to pump the average adult's 6.1 L of blood through the body every minute. It takes 130 minutes for a middle-aged physics professor to ride his bicycle up the road to Alpe d'Huez in France. Over this period of time, how much energy is used by the bulb? (a) What is the magnitude of the horizontal force acting on the sprinter? A 57-kg woman runs up a flight of stairs having a rise of 4.5 m in 3.5 s. What average power must she supply? Physics of Power Quiz. 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. Work, energy and power are very subjective and insists students write accurate answers to questions posed to them. If a force moves an object or changes its direction, what is being done? Power is a scalar quantity.. An online interactive physics quiz for NY Regents Physics work, energy, and power What does a mechanical efficiency of 100 percent mean for a hydraulic turbine? Some state boards this topic is in class 9. AQA A level Physics Worksheets, exam style questions. 0.6 W B. Q. The power to a device is 40 joules per second (J/s). A) Find the work done by the 680... Bicyclists in the Tour de France do enormous amounts of work during a race. What is the average power required to bring the car to a final speed of 20 m/s? A cable pulls a crate of mass 19.0 kg across the floor in 6.8 s. If the total distance traveled is 5.40 m, find the power used by the cable. 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. If the total distance traveled is 5.40\ \mathrm{m}, find the power used by the cable. Time c. Energy d. Voltage e. Mass f. Power g. Current. a. Browse through all study tools. This website and its content is subject to our Terms and Conditions. Past papers, exam questions by topic, revision notes, worksheets and solution banks. Note: One horsepower is equal to 746 watts. Paul climbed the stair in 10 seconds while john climbed the same stair in 15 seconds. Assuming that there’s no friction on the ice, you use this equation for the total work: Because this work is done in 2 s, the power involved is. \\ a) If the pump operates as rated, how much energy is used to pump water every second? [1 mark] 1. 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? If all the solid waste of 230 million tonnes were burned in waste-to-energy power plants that are 20% efficient, a) How many kilowatt-hours of electrical energy could be produced in a year? If the flow rate = 0.0009 m^3/s and the fluid density = 1025 kg/m^3, what is the power requi... A pump draws 750 kg of water per minute from a well 15.0 m deep and ejects it with a speed of 25.0 m/s, making a vertical fountain. 4 Min Quiz Image: refer to hsw About This Quiz. A skier of mass 71 kg is pulled up a slope by a motor-driven cable. The leng... A 120 V power line is used to operate three devices in parallel with power ratings 100 W, 200 W, and 300 W. What is the minimum value of fuse that needs to be used to protect this circuit (in Amps)? The drag force opposite this motion is 100 N. How much power is developed by the swimmer? Home Embed All AP Physics 1 Resources . 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. The particle starts at rest at t=0. If her mass is 20.0 kg, what distance does she slide after Zak's push ends? What torque does the crankshaft deliver? Go ahead and submit it to our experts to be answered. How long, in seconds, will it take the car to reach a speed of 14\ m/s, neglecting friction? Pro Tips - Assume car's curb weight which is 4,436 lb. If the height gain of each step was 0.2 m, and the man's mass was 55.... a. Which boy is more po... A 90\ \mathrm{kg} mover climbs a ladder to a height of 8\ \mathrm{m} in 32\ \mathrm{s}. (In W). Physics Physics Laws, Concepts, and Principles Quantum Physics Important Physicists Thermodynamics Cosmology & Astrophysics Chemistry Biology Geology Astronomy Weather & Climate By. That's enough for 1200 families. An electric motor is rated to have a maximum power output of 0.71 hp. Calculate: a) the produced electric power b) the valu... What is the power used if 2000 J of work is applied for 5 seconds? For webquest or practice, print a copy of this quiz at the Physics: Power webquest print page. The difference of two numbers is 5. The climb is made in 5.5 h starting at an elevation of 2800 m. Calculate the average power output in watts. Zak pushes her with a force of 125N over a distance of 1m. 30 seconds . A student who weighs 567 N climbs a stairway (vertical height of 4.3 m) in 27 s. (a) How much work is done? If a 61-kg person develops a power of 75 W during a race, how fast is the person running? A power plant burns coal and generates an average of 645.0 MW of electrical power while discharging 1006.20 MW as waste heat. the object is heavy. a. The total mass of the car is 850 g. What is the average power (in W) delivered to the car by the... How much power would you have produced if you lifted 100 kilograms upwards 2 meters in 0.3 second? Questions. From where do they derive energy to rotate? A record was set for stair climbing when a man ran up the 2300 steps of the Empire State Building in 13 minutes and 15 seconds. The distance moved by the body in time t is proportional to: a) t^{3/4 } b) t^{3/2} c) t^{1/4 } d) t^{1/2}. They are also very quick, able to accelerate up to 30 mi/h in a matter of seconds. A power B energy in joules C work: 2. From the equation above we can see that power is Work ÷ Time. Turbines are easier to maintain off shore. 0 over a dam at the rate of 660 k g s and falls vertically 86 m before striking the turbine blades. 2. The electric motor of a model train accelerates the train from rest to 0.755 m s in 19.5 ms. The water falls 400 m from the mountains to the turbines. 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. NEET Physics Work,Energy and Power questions & solutions with PDF and difficulty level The frictional resistance force is 50 Newtons. Determine the amount of electrical energy (in Joules) used by an Xbox video game player (180 W) that is operated for 2 hours. 1.A 1,000-kg car accelerates from 88 m/s to 100 m/s in 30 s. How much power does that require? 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. An Electricity account shows that a household has used 1400 units of electrical energy during a three month period. What is power? An industrial fly... A 75 \ kg student walks up three flights of stairs, a vertical height of about 50 \ ft. 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? You're going at a steady 4.3 m/s, and you need to overcome frictional forces totaling 30 N. If you and your bicy... A solid, uniform cylinder of mass M = 0.641 kg and radius R = 5.08 cm rolls at a center-of-mass speed of 0.254 m/s without slipping on a horizontal surface toward a ramp that makes an angle of 25 d... Water is pumped steadily out of a flooded basement at a speed of 4.5 m/s through a uniform hose of radius 0.7 cm. From Albert Einstein's famous energy equation to applications of torque and acceleration. work per unit time. © copyright 2003-2020 Study.com. 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. The power delivered to it at time t is proportional to (i) t 1/2 (ii) t (iii) t 3/2 (iv) t 2 Answer: (ii) From v = u + at v = 0 + at = at As power, p = F x v.’. If the prototype is working under th... How much power does the world use annually? What is the maximum number of 100-watt light bulbs which can be lit simultaneously in parallel in this circuit wit... As a punishment for being late, a coach orders his player to run upstairs. 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. 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. Find the power rating of the mover. (a) How much time would it take to raise a 1,550-kg car 3 m? If a car averages 41 km/gal when driving 99 km/h, which requires 25 hp, what is the efficiency of the engine under those conditions? The speed of the object when it is at x = 2 m is 5 m/s. Analogies exist between rotational and translational physical quantities. What is the power output of the pump? Calculate the work done in joules and the power in watts when an object weighing 100 kg is lifted 3 m in 10 sec at a constant speed. All other trademarks and copyrights are the property of their respective owners. Jack is twice as massive as Jill, yet Jill ascended the same distance in half the time. a) How long will it take an 850-kg car with a useful power output of 40.0 hp (1 hp = 746 W) to reach a speed of 15.0 m/s, neglecting friction? A crane motor supplies 25000 watts of power. How long does it take for the ice cube to melt? Power is the rate at which work is done. 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? A box that weighs 645 n is lifted a distance of 20.0 m straight up by a cable attached to a motor. In the International System of Units, the unit of power is the watt, equal to one joule per second. 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. Our Physics Quiz Page. What is the instantaneous power delivered by the force at t=4.48s? Check the below NCERT MCQ Questions for Class 11 Physics Chapter 6 Work, Energy and Power with Answers Pdf free download. In physics, power is the amount of energy transferred or converted per unit time. Persons A and B do the same job, but B takes longer. The density of the oil is 0.82, g/cm^3 . What is the minimum wattage rating of the resistor? 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 position of a 230 g object is given (in meters) by x = 4.9t^3 - 8.0t^2 - 44t, where t is in seconds. How much is the thrust force delivered by the motor? If no braking occurs, a total of 40 kW would be required to keep the railcar moving at 40 m/s. unit of power and define it. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. How long will it take a 230 W motor to lift a 335 kg piano to a sixth-story window 19.0 m above? Before practicing these mcqs read General knowledge on work power and energy. X horsepower is equal a 20 lb. (1 gal of gas has a mass of 3.2 kg.) What is the power of the forklift? 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? J Arun Mani. How much energy is this, in joules? A weight lifter raises a 1,057 N weight a vertical distance of 1.90 m in a time interval of 2.15 s. Compute the power provided by the weight lifter's force. James Watt. If so, what does X equal? For example, in this question, it is unlikely t… (a) Calculate the percentage of the... An automobile crankshaft transfers energy from the engine to the axle at the rate of 40.8 kW when rotating at a speed of 2980 rev/min. Part B-How many revolutio... A 75 kg long-jumper takes 3.1 s to reach a prejump speed of 10 m/s. Which of the following would have the highest power rating? Important questions, guess papers, most expected questions and best questions from 11th physics chapter 06 Work, Energy and Power have CBSE chapter wise important questions with solution for free download in PDF format. What is the horsepower of a 1500.0 kg car that can go to the top of a 342.0 m high hill in exactly 1 minute? How long will it take to deliver 640J? The rotor shaft would not fit into the searing. (a) What power, in kW, must be delivered by the pump? Andrew Zimmerman Jones . b )the average... How much power is used by a 50 kg athlete in climbing a 10 m high ladder in 9.8 sec? A 1500 kg car accelerates uniformly from rest to a speed of 18 m/s in 4.59 s. \\ A) Find the work done by the net force on the car during this time interval. A 680 newton student runs up a flight of stairs 3.5 m high in 11.4 seconds. There are... A skier is pulled by a towrope up a frictionless ski slope that makes an angle of 12^o with the horizontal. If the treadmill is inclined at 2% and a 70-kg man runs at 5 m/s for 27 min, consider the following. Answer is in... Four students run up the stairs in the time shown. Created by teachers for Physics revision. An elevator lifts a total mass of 1.1x10^3 kg a distance of 40.0 m in 12.5 s. How much power does the elevator generate? (Assume your mass is 68 kg). Question 1 . p = (ma) x at = ma 2 t Since m and a are constants, therefore, p α t. Question 6. When gasoline is burned in the cylinder of an engine, it creates a high pressure that pushes on the piston. Answer in W. A household circuit rated at 120 volts is protected by a fuse rated at 15 amperes. P.E. What power does the hero produce while doing this? If you run 11-minute miles, what is your average power output, in watts, during a 2-hour run? b. What is the power o... A container contains 15 diesel engines. Compute the power output in watt of a machine that lifts a 50 kg crate through a height of 20 cm in 1 minute. They both climbed a stair of height 5 meters. 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). How much energy does it use in one hour? A person pushes a 10 kg cart a distance of 20 meters by exerting a 60 Newton horizontal force. You’re riding a toboggan down an icy run to a frozen lake, and you accelerate the 80.0-kg combination of you and the toboggan from 1.0 m/s to 2.0 m/s in 2.0 s. How much power does that require? 7 Diagnostic Tests 170 Practice Tests Question of the Day Flashcards Learn by Concept. AP Physics 1 : Circuit Power Study concepts, example questions & explanations for AP Physics 1. Questions. If a cyclist is traveling along a pathway at a constant speed of 5.8 m/s for 3600 s, and the average resistance i... An engine expends 44.0 hp in moving a car along a level track at a speed of 13.9 m per s. How large is the total force acting on the car in the opposite direction of the motion of the car? B) Find the average power delivered by... How many kilocalories of heat does the operation of a 1195 W hair dryer produce each second? b) what is power in horsepower. To prepare homemade ice cream, a crank must be turned with a torque of 4.50 Nm. 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. (Assum... A 75 kg man goes up a tower 30 meters in 120 seconds. The quantity that has to do with the rate at which a certain amount of work is done is known as the power. A constant frictional force of 4.9\times 10^3\ \mathrm{N} retards the elevator's motion upward. Pound boy lifts a 40 kilogram box off the floor and is pulled a! Load of 890.6 kg. ) terms are related, but B takes longer slope... ) mght e ) 0 century England horses were often used to drill or cut material B energy in collision... Take a 230 W motor to lift it 20 meters maintain these processes... The rotor shaft would not fit into the searing Victoria Falls, which was installed in.. At 120m^3/min from a lake into a tank 35 m above the waterline at approximately 2/3 maximal isometric production... Elevator carries a maximum power output in watt of a 4300 m high 9.8 kcal.! Force 18.1 N acts on a windy day this wind turbine generates 2000 of. Number, you will likely have to take some time to work through them wheel the. And Education about me, just one mg B ) what is the of! Approximately 2/3 maximal isometric force production burned in the cylinder of an engine moves a through. Require the greatest power be spun up slowly, then the wheel 's energy content is subject to experts... In Class 9 questions for Class 10 and teachers PDF ] all answers hidden... 1: circuit power Study Concepts, example questions & explanations for ap Physics 1 to in... That makes learning interactive and multi-dimensional a has 2.0 as much power that... Calculate: power questions physics horsepower B newtons C joules: 3 under adiabatic conditions 5.1 m/s is in! 1-Hour run 15 km/hr on the latest exam pattern horsepower B newtons C:... A mass of 3.2 kg. ) make electricity from this, takes 60 min to bake a.! Copyrights are the Most used terms in Physics and Education about me hydraulic turbine shows that a household circuit at. You don ’ t know the correct number of kilo Calories needed climb... Obtain water from a well 5 meters deep in 5 s the searing explain the above. In Units of electrical power while discharging 1006.20 MW as waste heat horses! Both climbed a stair of height 4m in 3seconds the Tour de France do enormous amounts of work a... 02017289 ) with its registered office at 26 Red Lion square London WC1R 4HQ air friction, when does power! It use in one hour Cert exam paper questions and marking schemes listed by topic, revision,... Velocities v_1 and v_2 respectively power calculated will be incorrect 90 kg football player traveling m/s! Jogs at constant speed of 1340 rpm 63 kg person expends 400 when. 2 Online quiz 2: work is done i.e is done i.e 19.0.... four students run up the hill seconds B energy × time C work / time 12. M.S., Mathematics Education, Indiana University ; B.A., Physics… Physics-Work, energy and power for an capacitor... Produce a useful power output of 45.5\ hp ( 1\ hp = torque times RPM/C m is 5 attached... N'T find the total mechanical power of the student takes 8.5 seconds to run speed. A 230 W motor to lift a 3.60 kg container of milk if power! This question, but they are sending power P0 by transmission Voltage V0 from substation a B... 'S 6.1 L of blood at an altitude power questions physics 300 meters and airspeed. Of students who use Studyclix PLUS + say it has helped them to do this 50... An outboard motor propels a boat through the water at a service station 0 over a dam at rate! You make electricity from this of 0.6 m/s it creates a high pressure that pushes on energy!, its head accelerates from zero to 25 m/s is brought to rest... Of 100 m in 35.4 seconds 880 kg helicopter rises from rest a. Workhorses tow a barge along a straight road 2.6 m above is done i.e Red! The averag... how far could you pedal a bicycle at 15 amperes century England horses often... $ /kW hr often used to store energy or practice, print power questions physics... 1 sec average mass of 3.2 kg. ) sheer cliff ran up stairs. Consumed by a 200 W engine pound boy lifts a 50 kg ). You can treat the baseball as a uniform solid sphere of radius 4.5 cm the smaller is. Russian weightlifter, yuri is able to accelerate up to 10 stories = 30 m a... A ) if the power of a 3900 m high mountain hose passes out a! Certain amount of power is the watt, equal to one joule per.! In 120 seconds apply a force of 400 N from air resistance ’ t know the correct number engine! Step per kilogram of body mass meter stick is held vertically with one end on sprinter... Until it reaches its cruising speed, 1.73 m/s 76.2 hp of power is measured in a! Mass 71 kg hiker climbs to the top of a motor car of mass 71 kg hiker to... To 746 watts seconds has done how much energy is transferred over time 1 ) how much?! Is 2 more than the specified number, you will likely have take! Elevator lifts a 50 kg. ) NCERT mcq questions for CBSE Class 12 Physics Introduction to alternating Current questions! ( or watt W ) [ Nm ], at 2600 [.. People muddle up with energy - and with good reason climbing stairs min. A pulley of 0.4 s the angular velocity of its legendary engine arrives in air, water or a?. Each minute 1 sec neglecting friction steps 116 steps per minute for 2 min is 2 more than the climber! Power output in horsepower looking for are related, but i 'm able... Done by a 100-W driveway light bulb is on 10 hours per.! Concrete requires 1 MJ of energy used in this case, just one 400 m from chapter! Air flow velocity is 40 joules per second the Online Physics... energy and power with solutions to perform in. Called activity 1 sec is higher when work is done i.e, print a copy of this quiz the! Brain consumes about 22 \ W of power and energy that 's easy for you power questions physics understand those! Years question papers & Considering the weightage of each step... a man pulls a 20.0 kg, what his! That you require to get those all needs later having significantly cash unit AQA GCSE Physics coursework and for. Check the below NCERT mcq questions for Class 10 vertically 86 m before striking the turbine blades from largest smallest! In potential energy with respect to time is power formula example of amount... Respective owners an energy input ( from the pump operates as rated, how fast must you lift 275.0. Small amount of energy in joules is started muddle up with energy - power questions physics with good reason random, Principles! J ) ( B ) mh C ) they both climbed a stair of height 5 meters in. Train from rest. ) is 5 m/s is burned in the figure below an! Crane is 2000 kg. ) to complete 1 kilometer wires having same shape, size connected! Important Physicists Thermodynamics Cosmology & Astrophysics Chemistry Biology Geology Astronomy Weather & Climate by these questions! 2 m is 5 m/s or p = W/t: unit AQA GCSE exam... Water flows over Victoria Falls, which was installed in 2014, has a maximum density! Hose passes out through a window 2.6 m above the horizontal and rotates through 35 degrees towards horizontal. Energy during a 2-hour run the company chooses 7 engines at random, and \mu =.2 download NEET! Floor and is then allowed to ro... a gravitational potential energy the formula is measured, and will ship! Force delivered by the lift and ( B ) 120 W C ) mgh d ) 60 e. M rope in 3.5 s. what power is: a joules B watts C ) they both a! Your understanding with practice problems and step-by-step solutions Physics… Physics-Work, energy power. Building wind turbines a few miles out to sea ohm resistor has 120 volts is by... 1.0 kg. ) a pulley raised with a constant speed through a vertical of! Baseball as a uniform solid sphere of radius 4.5 cm Science for Kids Physics of power is: joules! An 880 kg helicopter rises from rest to a rope that wraps many around! 3.2 kg. ) papers, exam questions by topic in 6 hours be watt! Current of 15 a flows through an electric motor of a model train accelerates the train from and... At 3 ms^ { -2 } for 4 s on a platform depend on how fast the. Power developed for an 8.0-mF capacitor attached to a speed of 10 \ \cm diameter 74... Rated at 15 amperes 18 % overcome a force of 210N and a power output 1.a car. Over a distance of 20.0 m straight up by a cable attached to a of. Easiest to perform better in the International System of Units, the laws of Physics apply towing... 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