Which phase changes are endothermic?

Why does the input force have to be greater than the force needed to lift the bale?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.