There is a 30 g sample of Be-11. It has a half-life of about 14 seconds.

How much will be left after 28 seconds?

A. 3.75 g

B. 7.5 g

C. 15 g

D. 30 g

The energy associated with the random motion of molecules or atoms within a substance is

The more mass an object has the more or less potential energy it has?

A cork able to float on water because it is

Does a energy transformation happen when you drop your pencil

What is an apparent change in the frequency of sound or light waves known as?

How can you make gravity smaller and bigger

What is friction and explain

How does the velocity, the distance it has fallen and the acceleration of a free falling body change with time?

Woman pulls a 6.87 kg suitcase, initially at rest, with a 29.2 N force along the handle at 57.7º. Friction pulls back at 12.7 N, and the suitcase moves 5.93 m. What is its final speed? (Unit = m/s)

Suppose you know a golf ball's horizontal velocity and the time it has traveled through the air. how could you calculate how far the ball traveled