An isotope decreased to one fourth its original amount in 18 months. What is the half life of this radioactive isotope?

A 0.540-kg bucket rests on a scale. Into this bucket you pour sand at the constant rate of 56.0 g/s. If the sand lands in the bucket with a speed of 3.20 m/s, (a) what is the reading of the scale when there is 0.

Chanel has some cotton candy that came in a cloudy shape. She wants to make it more dense. Which describes the candy before and after Chanel manipulated it?

Which of the following is the best example of a proper hypothesis? 1. I think there is no effect on hearing if you listen to loud music only three hours a day. 2.

Name the device which measure distance travelled by the body

a cat plays with a toy mouse suspended from a light string of length 1.25 m, rapidly battling the mouse so that it acquires a speed of 2.75 m/s while the string is still vertical.

Why have plants in the alpine biome adapted to survive on limited nutrients?

At a molecular level, does plasma have more or less energy than other states of matter?

A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt.

How can you predict the action of the element

How is the mass of a liquid substance affected after it freezes A) It increases. B) It decreases. C) It stays the same.