A 10 kg sled is sitting on top of a 10 m hill what is the potential energy of the sled

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?