Amy has a mass of 50kg she is riding a skateboard traveling 10m/s what is her momentum?

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.)

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?