Describe a situation when a pulley has kinetic energy

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

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.