In which of these reactions is energy released? A. endothermic reactions B. exothermic reactions C. no reactions D. all reactions

Sunsets are red because A. the longest path of sunlight through the atmosphere is at sunset or sunrise. B. a lot of high-frequency light is scattered by the atmosphere. C. blue light from the sun is scattered by Earth's atmosphere. D.

A ball is rolled uphill a distance of 3 meters before it slows, stops, and begins to roll back. the ball rolls downhill 6 meters before coming to rest against a tree. what is the magnitude of the balls displacement?

A 217 kg motorcycle moves with a velocity of 2 m/s. what is it's kinetic energy?

A hot air balloon competition requires a balloonist to drop a ribbon onto a target on the ground. Initially the hot air balloon is 50 meters above the ground and 100 meters from the target.

What is the charge of a nuclei

Which of the two resistors dissipates the larger amount of power?

Three students derive the following equations in which x refers to distance traveled, v the speed, a the acceleration (m/s^2), and t the time, and the subscript (0) means a quantity at time t=0: a) x=vt^2 + 2at, b) x=v0t+1/2at^2, and c) x=v0t+2at^2.

Which is a use of fiber optics?

When a positively charged conductor touches a neutral conductor, the neutral conductor will:

Definition of the rule E=mc^2