A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 30 m in 2.0 min, what is the average power delivered by the child?
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Q: average power delivered
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Q: A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 30 m in 2.0 min, what…
A: Given , Force = 75 N Displacement s = 30 m Time = 2 minutes
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Q: power
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- How much power is needed to push a 1100 kg piano up a 4.0 meter ramp into a truck bed that is 1.5 meters off the ground in 10.0 seconds. The coefficient of friction between the ramp and the piano is 0.32A 1100 kg car drives up a hill that is 16.2m high. During the drive, two nonconservative forces do work on the car: (i) the force of friction, and (ii) the force generated by the car's engine. The work done by friction is −2.91×105J; the work done by the engine is 6.74×105JFind the change in the car's kinetic energy from the bottom of the hill to the top of the hillYour job is to lift 25.0 kg packaged boxes a vertical distance of 1.0 m from the ground onto the bed of a delivery truck. How many packaged boxes would you have to load onto the truck in one minute for your average output power that goes into lifting the boxes to be 0.11 hp?
- A sprinter who weighs 639 N runs the first 8.6 m of a race in 1.9 s, starting from rest and accelerating uniformly. What are the sprinter's (a)speed and (b) kinetic energy at the end of the 1.9 s? (c) What average power does the sprinter generate during the 1.9 s interval?A puck with a mass of 159.0 g is sliding with an initial velocity 31.0 m/s. The puck enters a section of rough ice and slows to a speed of 15.1 m/s. What is the magnitude of the work done on the puck by the rough ice? Express your answer in Joules to 1 decimal place.A helicopter lifts a 65 kg astronaut 18 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? (b) How much work is done on the astronaut by her weight? (c) What is the kinetic energy? (d) What is the speed of the astronaut just before she reaches the helicopter? m/s
- A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 81 kg, and the height of the water slide is 11.8 m. If the kinetic frictional force does -5.1 × 103 J of work, how fast is the student going at the bottom of the slide?A 600 N person climbs a ladder at a constant speed. The person climbs up 12 meters in a time of 20 seconds. What is the work done and the power exerted?A railroad locomotive accelerates a 95,000-kg railcar from 10 m/s to 25 m/s in 90 seconds. What was the average power transferred to the boxcar during this process? 25 MW 280 kW 330 kW 2.3 MW 48 kW
- A man pushes a lawn mower on a level lawn with a force of 211 N. If 52% of this force is directed forward, and 53 W of power is expended in pushing the mower 7.0 m, how much time is spent in pushing the mower this distance?A warehouse worker pushes a crate across a rough floor. A frictional force of 22.5 N acts to oppose the motion of the crate, and the worker pushes with a horizontal force of 40.6 N. If the total work done by the worker on the crate is 98.0 J, through what distance did the worker push the crate?A cheerleader lifts his 68 kg partner straight up off the ground a distance of 0.72 m before releasing her. Assume the partner’s velocity is zero at the beginning and the end of the lift. The acceleration of gravity is 9.8 m/s2 . If he does this 22 times, how much work has he done? Answer in units of J.