can someone please help me I am so behind I neee to catch up but I need it to be correct both of them

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.

The heliocentric and the geocentric models of the solar system included these central principles