The distance d that a spring will stretch varies directly as the force f applied to the spring. If a force of 6 lb is required to stretch the spring 3 in, what force is required to stretch the spring

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

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?