Radioactivity was discovered in about

After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is (neglecting air resistance) A. less than when it was at the top of its path. B.

Which of the following descriptions explains the process of water freezing? A) Water molecules speed up until they escape into a different phase.

1. In a single atom, no more than 2 electrons can occupy a single orbital? A. True B. False 2. The maximum number of electrons allowed in a p sublevel of the 3rd principal level is? A. 1 B. 6 C. 2 D. 8 E. 3 3.

It takes Andy 0.50 seconds to lift a 98-newton box from the floor and place it on the table. If he expends a constant power of 137 watts during this time, what is the height of the table?

Sally is training for the 1,000-meter running race at her school. Her goal is to place third or better. How can Sally determine if she is making progress toward her goal?

An apple drops from a tree and hits the ground in 1.5s what is its speed just before it hits the ground?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?

A tow truck pulls a 500 kg car so that the car accelerates 2 m/s2. What is the net force on the car? 250 N 498 N 1000 N 502 N

Which force keeps you near earths surface?

Name one process that requires a force in the human body.