You stand on a bridge above a river and drop a rock into the water below from a height of 53 m. What is the acceleration of the rock as it falls

20 pts Choose all the answers that apply. Which of the following statements are true? After the vernal equinox the nights become longer in the northern hemisphere. After the autumnal equinox the days become shorter in the northern hemisphere.

A railroad tank car contains milk and rolls at a constant speed along a level track. The milk begins to leak out the bottom. The car then a. Need more information about the rate of the leak. b. maintains a constant speed. c. speeds up. d. slows down.

Three lites equals how maby millimeter

If the number of predators in the environment increases, what happens to the number of prey organisms?

Lightning bolts occur when negative charges in clouds: A. Flow positively to the ground B. Flows negatively to the ground C. Flows to the negatively charged clouds D. cause thunder to sound

As resistance goes up, what happens to the current?

1. A 0.828-nm photon collides with a stationary electron. After the collision, the electron moves forward and the photon recoils backwards. a) Find the momentum of the electron. b) Find the kinetic energy of the electron.

When are you most aware of your motion in a moving vehicle: when it is moving steadily in a straight line or when it is accelerating?

The force of gravity on a person or object on the surface of a planet is called?

What happens to the particles of the liquid inside a thermometer when the thermometer is heated? They slow down and spread apart. They speed up and spread apart. They slow down and move closer together. They speed up and move closer together.