While attending a ballgame in St Louis the Wallace boys were amazed to see Berkman (their favorite player) hit a pop up that reached a height of 72m and the baseball has a mass of 0.45 kg. Find the potential energy of the baseball at the top of its fall.

The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?

In a system, when potential energy decreases, then entropy also decreases. true false

In an experiment, how can i change human errors? be specific.