What exactly are molecules, how do they function?

What mass will a pumpkin have a force of 450 newton’s accelerates it to 110 m/s^2? include the correct units.

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?