What does the narrator mean when he says that energy is “as old as time itself?”

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

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?