The atmosphere is a mixture of gases. It is mostly composed of

A small, dense center that has a positive charge and is surrounded by moving electrons

A 12 kg ball moving at 20 m/s strikes another ball at rest. After a completely inelastic collision, the balls move at 10 m/s. What was the mass of the second ball?

A generator can be powered by falling water. True False

Two red blood cells each have a mass of 9.05*10-14 kg and carry a negative charge spread uniformly over their surfaces. The repulsion arising from the excess charge prevents the cells from clumping together. One cell carries - 2.

What processes formed the beaches of Florida?

If an igneous rock has very large crystals of minerals that you can see when looking at it, which type of igneous rock is it

You have a 60-foot roll of fencing and a large field. You want to make two paddocks by continuing the fencing down the middle of a rectangular enclosure. What are the dimensions of the largest such enclosure you can make?

Crystallization is a separation technique used to produce rock candy from a sugar solution. true or false

A car traveling in a straight line has a velocity of 3.79 m/s at some instant. After 5.4 s, its velocity is 11.9 m/s. What is its average acceleration in this time interval? Answer in units of m/s 2

The periodic law states that elements that have similar properties appear ... a. to the left of each other b. to the right of each other c. at every 10th element d. at regular intervals