Suppose you are investigating how the day ends hamsters affect how much they run on the hamster wheel. in order to control the experiment which of these should you do? a. change only the diet of each hampster. b. give all the hamsters the exact same diet. c. only allow some hampsters to run on the wheel. d. compare the behavior of hamsters and gerbils

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)