Why do radio waves diffract around buildings, while light waves do not?

What do cell phones require to work? A. The GPS system B. Ultraviolet rays C. A cellular system D. X-rays

Two cars raced at a race track. The faster car traveled 20 mph faster than the slower car. In the time that the slower car traveled 165 miles, the faster car traveled 225 miles.

Air creates a frictional drag acting with the motion of falling objects. True False

To recharge your cell phone you plug it into an electrical outlet for several hours. The electrical energy is stored as ___ energy until you are ready to use the phone. A. radiant B. thermal C. nuclear D. chemical

Genetics is the most important factor that affects your physical fitness. a. True b. False

An astronaut weighs 104 newtons on the moon, where the strength of gravity is 1.6 newtons per kilogram. What would she weigh on Mars?

A chemical bond formed when Adams share three pairs of electrons is A. an ionic bond B. a single bond C. a double bond D. a Triple bond

A 1100 kg car rounds a circular turn of radius 24.6 m. Of the road is flat and the coefficient of static friction between the tires and the road is 0.59, how fast can the car go without skidding

What is the momentum of a 15 kg tire rolling down a hill at 3 m/s? 5 kg • m/s 18 kg • m/s 45 kg • m/s 60 kg • m/s

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third