A roller coaster with a potential energy of 235,200 J sits at the top of a 30 m high hill. What is the mass of the roller coaster? (Formula: PE = mgh)

1. The sun and other stars produce visible light by a. fluorescence. b. luminescence. c. incandescence. d. electroluminescence.

The temperature of water in is 45 dgrees celsius. What does this measurement represent?

Why does a wet towel spread out and hung outside on a windless day dry faster than a wet towel left rolled up in a plastic bag?

What was the key breakthrough in the interpretation of quasar spectra?

A uniform thin rod of length 0.400 m and mass 4.40 kg can rotate in a horizontal plane about a vertical axis through its center. the rod is at rest when a 3.0 g bullet traveling in the rotation plane is fired into one end of the rod.

If a small child were to release a balloon into the atmosphere, what would happen to the size of the balloon as it makes it way higher in the sky?

Is a aluminum pie plate an element

The age of the solar system can be established by radioactive dating of

What changes in the original atom are expected as a result of this natural phenomenon

What is a descriptions of an animal cell's nucleus?