Homework Help: physics

Posted by Ryan on Thursday, October 22, 2009 at 10:30am.

A 7.5-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling. If the box is being lifted at a constant speed of 2.0m/s, what is the power delivered by the person pulling on the ropre? If the box lifted at constant acceleration from rest on the floor to a height of 1.5m above the floor in 0.42s what average power is delivered by the person pulling the rope?

physics - bobpursley, Thursday, October 22, 2009 at 11:12am
power= force*distance/time= mg*velocity

If being accelerated, then force=mg+ma

Answer this Question

Related Questions

physics - A 6.9-kg box is being lifted by means of a light rope that is threaded...
Physics - The diagram for this problem is a pulley. On the left end Box 1 is ...
physics - A light rope is attached to a block with a mass of 6 kg that rests on ...
Physics - A 70 kg person stands on a 30 kg platform and pulls on a massless rope...
physics - A light rope is attached to a block with a mass of 6 kg that rests on ...
Physics - A 1.7kg block and a 2.7kg block are attached to opposite ends of a ...
Physics - A hanging mass, M1 = 0.78 kg, is attached by a light string that runs ...
physics - A 3 lb bucket containing 40 lb of water is hanging at the end of a 20 ...
science: physics - A 2.0 kg breadbox on a frictionless incline of angle is ...
Physics - A special pulley has two discs with radii R1 = .8 m and R2 = .35 m. A ...

For Further Reading

First Name:
School Subject:
Answer: