F14-9. If the motor winds in the cable with a constant speed of v = 3 m/s, determine the power supplied to the motor. The load weighs 100 N and the efficiency of the motor is ɛ = 0.8. Neglect the mass of the pulleys. D B. A v = 3 m/s %3D E M

Determine the work done by an electric motor lifting an elevator and its occupants weighing 2200 lb through five floors; assume a distance of 15 ft between each floor. Compute the power requirements for the motor to go from the first to the fifth floor in a. 5 s b. 8 s

A winch motor generates 500 W and uses it to pull a 250 kg crate across a horizontal floor. The crate starts from rest and the winch is applied for 5 seconds. The final speed of the crate is

How long will it take a motor with a 1520 W power output to lift a 160 kg couch to a seventh story window 18.7 m above ground? O 19.3 s O 2.84 x 104 s O 1.97 s O 1.03 s

2. For a satellite in a circular orbit around the earth, the gravitational force from the earth on the satellite causes the centripetal acceleration. The amount of work done by the gravitational force from the earth on the satelliteA) is zeroB) is greater than zero.C) is less than zero.D) would be different if the masses of the earth and satellite were different.E) can’t be determined without a calculator and some data.i. Prove your answer by using the formula for work, W: (Hint: Consider just a short segment of the orbit, rather than the full revolution.) ii. Prove your answer by talking about the satellite’s kinetic energy, ∆?� ***also please do it i,ii and write a process detail.

30. A 10-m chain with mass density 4 kg/m is initially coiled on the ground. How much work is performed in lifting the chain so that it is fully extended (and one end touches the ground)?

Is it experimentally possible that the energy absorbed by the cylinder due to friction could be greater than the work performed on it? Explain.

WP-2 Leo has designed a winch to pull a 120kg crate up a rough ramp. The crate travels with a constant speed 4.75m along the ramp in 30.0s. The coefficients of friction between the crate and the ramp.are: H 0.175 and p=0.300. Neglect air resistance. 4.75m m-120kg 35.0⁰ What (total) power must Leo's winch produce in order to move the crate as described above.

An electric winch causes an elevator to move between floors of a ten-story building. The mass of the elevator with a maximum load of passengers is at most 500. kg. The elevator moves a speed of 0.304 m/s taking a time of 115.s to travel the distance of 35.0 m. What is the minimum power rating this winch would have? Select one: a. b. C. d. 1.49 x 10³ W 1.30 x 10¹ W 4.90 x 10³ W 1.72 x 105 W