What will be the pressure exerterd by the 0bject if 4000n is acting on an area of 50msqure

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

In the illustration, which two simple machines are being used to enable the student to reach the door? a. inclined plane and pulley b lever and wheel-and-axle c pulley and lever d wheel-and axle and inclined plane

What is the specific heat of wood ?