Experiment to determine the cubic expansivity of a liquid

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (