The loaded cab of an elevator has a mass of 4.70 × 103 kg and moves 191. m up the shaft in 24.0 s at constant speed. At what average rate does the force from the cable do work on the cab?

A loaded ore car has a mass of 950 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 33.0° above the horizontal. The car accelerates uniformly to a speed of 2.25 m/s in 12.5 s and then continues at constant speed. (a) What power must the winch motor provide when the car is moving at constant speed? 11.73 x KW (b) What maximum power must the motor provide? 11.7 ✓ KW (c) What total energy transfers out of the motor by work by the time the car moves off the end of the track, which is of length 1,250 m? X J

A boy in a wheelchair (total mass 47.0 kg) has speed 1.40 m/s at the crest of a slope 2.60 m high and 12.4 m long. At the bottom of the slope his speed is 6.20 m/s. Assume air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N. Find the work he did in pushing forward on his wheels during the downhill ride.

A loaded ore car has a mass of 950 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 34.5° above the horizontal. The car accelerates uniformly to a speed of 2.00 m/s in 12.5s and then continues at constant speed. (a) What power must the winch motor provide when the car is moving at constant speed? 10.55 ✓ kW (b) What maximum power must the motor provide? 10.86 ✓kw (c) What total energy transfers out of the motor by work by the time the car moves off the end of the track, which is of length 1.250 m² 5.65 106 X Consider how the change in mechanical energy of the cart is related to the amount of energy that transfers into and out of the system. J Need Help? Road !!

A 27.0-kg child on a 4.00-m-long swing is released from rest when the ropes of the swing make an angle of 35.0° with the vertical. (a) Neglecting friction, find the child's speed at the lowest position. m/s (b) If the actual speed of the child at the lowest position is 3.30 m/s, what is the mechanical energy lost due to friction? Need Help? Read It

The power source for a non-electric grandfather clock is a 12.0 kg weight that hangs by a chain and slowly falls 0.750 m every week as the pulling force runs the clock.  At the end of each week, the owner pulls the mass up back to the top and the clock runs for another week.  What is the average power required to run the clock? (1 mW = 10^-3 Watts,  1 µW = 10^-6 Watts)

The loaded cab of an elevator has a mass of 4.70 × 103 kg and moves 191. m up the shaft in 24.0 s at constant speed. At what average rate does the force from the cable do work on the cab?

A child on a tricycle is moving at a speed of 1.40 m/s at the start of a 2.05 m high and 12.4 m long incline. The total mass is 58.5 kg, air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N, and the speed at the lower end of the incline is 6.60 m/s. Determine the work done (in J) by the child as the tricycle travels down the incline. 1216.80 As the tricycle travels down the incline, there is a change in kinetic energy (it increases), there is a change in gravitational potential energy (it decreases), the change in internal energy consists of a "thermal" increase due to the frictional interaction, and a "chemical" decrease due to the child burning calories. J

A car accelerates uniformly from rest to 20.0 m/s in 5.6 s along a level stretch of road. Ignoring friction,calculate the average power required to accelerate the car if the weight of the car is 9.0 × 103 N

A child on a tricycle is moving at a speed of 1.40 m/s at the start of a 2.45 m high and 12.4 m long incline. The total mass is 45.5 kg, air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N, and the speed at the lower end of the incline is 6.80 m/s. Determine the work done (in J) by the child as the tricycle travels down the incline. J