An ordinary light bulb consumes 40 W of power. Through what height could a 1000-N object be lifted expending the same amount of power for 6 hours?   Group of answer choices: 360 m 860 m 720 m 650 m 430 m

A helicopter lifts a 83 kg astronaut 12 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/15. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed? (a) Number Units (b) Number Units (c) Number Units (d) Number Units

A 1000-kg car accelerates from 0 to 15 m/s in 5.0 s with negligible friction and air resistance. What is the average power delivered by the engine? 7500 W O 45000 W O 1500 W O 22500 W O 112500 W

25. A boy with mass m-50 kg walks up h-2 m high stairs at a constant speed in t=4 s. What is the average power in W used in walking up the stairs? (a) 40 (b) 50 (c) 100 (d) 200 (e) 250

A 2.5 kg bowling ball is tied to a 1m long string attached to the ceiling. The ceiling is 5 m above the floor. What is its change in potential energy relative to the floor? 31.3 J O 122.5 J 98.0 J O 24.5 J

Situation 3: A skier of mass 78.0 kg is pulled up a slope by a motor-driven cable. 21. How much work is required to pull the skier a distance of 50.0 m up a 40.0° slope (assumed frictionless) at a constant speed of 3.20 m/s? 22. A motor of what power (Watts) is required to perform this task?

A 2500-W electric motor raises a 500-kg sack from a height of 2.0 m to 24.0 m in 50 s. The efficiency of the motor is: 8.8 % O 40 % O 86 % O 0.42 % O 95 %

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 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.

Assuming g= 9.8 m/s2 near the surface of the Earth 3. Travelling in a mountainous area, a bus of mass 3 tons reaches the edge of a steep valley. There is a 1 km vertical drop to reach the valley below, but 20 km of road to get there. What gravitational potential energy? Will the bus lose in making the descent to the valley bottom?