Why is it important to get enough sleep each night?

2 + 2 is 4. Minus one it's three

Why are stars changing colurs by blinking?

A boy standing on a 19.6 meter tall bridge sees a motorboat approaching the bridge at a constant speed. When the boat is 27 meters from the bridge, the boy drops a stone to the water below. If the stone strikes the water 3.

Which of the following statements are true concerning electromagnetic waves in a vacuum? Check all that apply Electromagnetic waves travel in a vacuum with a definite and unchanging speed.

15. The frequency of a wave is measured in which of the following units?

When you bring the negatively charged balloon near a rod, how do the electrons move? The electrons move away from the balloon. The electrons do not move. The electrons move toward the balloon.

Mazie stands on her kitchen floor. The coefficient of kinetic friction between her socks and the floor is 0.62, and the coefficient of static friction is 0.75. She has a mass of 42 kg. a.

The kinetic energy of an object is quadrupled. its momentum will change by what factor?

Combining which of the following substances with germanium will cause the germanium to emit free electrons? A. Bismuth B. Gallium C. Aluminum D. Indium

A 50.0-g Super Ball traveling at 25.0 m/s bounces off a brick wall and rebounds at 22.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.