You observe someone pulling a block of mass 33 kg across a low-friction surface. while they pull a distance of 4 m in the direction of motion, the speed of the block changes from 4 m/s to 6 m/s. calculate the magnitude of the force exerted by the person on the block. what was the change in internal energy (chemical energy plus thermal energy) of the person pulling the block?

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?