A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time How many people would it take to replace a large electric power plant that generates 700 MW?  people

5. Two people of the same mass climb the same set of stairs. Person A climbs the stairs in 25 s. Person B climb the stairs in 35 s. a. Which person does the most work? Explain your answer b. Which person produces more power ? Explain your answer

An electric elevator with a motor at the top has a cable weighing 4.5 pounds per foot.When the car is at the first floor, 180 feet of cable are out, and effectively 0 feet are outwhen the car is at the top floor. The elevator car itself weighs 2000 pounds when empty   a) Find the work done by the motor lifting just the empty elevator car from the firstfloor to the top floor, ignoring the cable. b) Find the work done by the motor lifting just the cable from the first floor to the topfloor. Keep in mind, that the cable gets shorter and must therefore get lighter as theelevator goes up.

Please answer this question in detail, Don't use chatgpt.

11. Can a normal force on an object ever do work on the object? Explain.

A 2,000-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 3.00 m before coming into contact with the top of the beam, and it drives the beam 14.6 cm farther into the ground as it comes to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest.

Calculate the potential energy of a 430g book being help at 1.9m off the ground. Report your answer in J.

1. Refer to figure 1. The 10.0 kg green cart travels down a ramp - from point A to B. Calculate its starting potential energy, kinetic energy at the bottom of the ramp, and its velocity coming off the bottom of the ramp. If the cart coasts from points B to C, did it do any work? How far up the 2nd ramp does the cart go as measured from the ground? 10.0m Figure 1 B

Calculate the mechanical potential energy.

A person with a range of vision from 50 cm to ∞(infinity) uses a 19 cm focal length magnifier. (a) Find the angular magnification when the magnifier is used with the eye relaxed.(b) Find the angular magnification when the magnifier is used with the eye focused at its near point.