A child drops a ball from a window. The ball strikes the ground in 3 seconds. What is the velocity of the ball the instant before it hits the ground?

How many neutrons are contained in 2 kg? Mass of one neutron is 1.67x10-27 kg.

A 0.5 kg ball moving at a speed of 3m/s rolls up a hill. How high does the ball roll before it stops

The HR diagram displays the apparent magnitude of stars. True False

How does kinetic energy affect period

Which of the following would be used to measure the volume of a fluid? stopwatch graduated cylinder scale meter stick

The weight of an object varies inversely with the second power of the distance from the center of Earth. The radius of Earth is approximately 4000 miles.

The chemical reaction of oxygen with other substances is called A. erosion. B. oxidation. C. exfoliation. D. acidification.

Find the net charge of a system consisting of 6.16*106 electrons and 7.68*106 protons. Express your answer using three significant figures. Qnet = 2.43*10-13 C

A motorist is driving at 20m/s when she sees that a traffic light 200m ahead has just turned red. She knows that this light stays red for 15s, and she wants to reach the light just as it turns green again. It takes her 1.

Does sound move as a longitudinal or transverse wave in a medium?