The colors of light emitted by incandescent gases show the A. absorbing qualities of gas. B. polarization of atoms in the gas. C. relative masses of atoms in the gas. D. identities of atoms in the gas.

Which description best explains why the view within the rectangle lens is different than the view outside the lens? Light waves are restricted to a single plane through the lens.

If 100ml of cold water is added to 100ml of hot water what happens

Where will water evaporate from? A. from oceans and rivers only B. from rivers and streams only C. from any water source and life forms D. from life forms only

How can you tell if a car is moving? A. The car has wheels. B. The car is in the driveway. C. The car has a motor. D. The car is changing its position.

A 1.0-mol sample of hydrogen gas has a temperature of 27◦C. (a) What is the total kinetic energy of all the gas molecules in the sample? (b) How fast would a 65-kg person have to run to have the same kinetic energy?

O'Malley is riding on a bus which is moving at 10 m/s, and he throws a ball which he observes to be moving at 10 m/s relative to him in the direction of motion of the bus. What speed will Ophelia observe the ball to have?

Part 1. A girl leaves a history classroom and walks 10 meters north to a drinking fountain. Then she turns and walks 30 meters south to an art classroom. What is the girl's total distance traveled? Part 2. Using the information above from Part 1.

Which of the following is an example of a physical change but not a chemical change? A) The log gives off heat and light as it burns B) A tree stores energy from the sun in its fruit C) A penny lost in the grass slowly changes color D) A water pipe

Land masses that move on Earth are called: a. Continents b. Tectonic continents c. Tectonic plates d. Rock Masses

Will two separate 50db sounds together constitute a 100db sound explain mathematical