Isaac wants to make s'mores. he holds a marshmallow on a metal skewer over a fire. a few seconds later, the marshmallow is cooked and the skewer feels warm. what most likely happened? ]
the fire heated the surrounding air, which cooked the marshmallow.
the heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.
the heat from the skewer cooked the marshmallow.
thermal energy in the form of heat moved from the fire to the skewer and marshmallow.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?