Refraction occurs when a wave

a.

enters a new medium at an angle.

b.

hits a surface through which it cannot pass.

c.

moves around a barrier.

d.

interferes with another wave.

Many of the whales in the ocean rely upon tiny marine organisms, called plankton, for food. If all of the plankton suddenly died, what might happen to the whales? A. They would start eating fish. B. They would not survive either. C.

Ashen light (or earthshine) is a. the sunlight that shines on the face of the Moon that we never see. b. the light from the Moon that illuminates Earth's surface at night. c. the light we see at dusk just after the Sun sets. d.

10. A satellites is in a circular orbit around the earth at a height of 360 km above the earth's surface. What is its time period? What is its orbital speed?

How conduction allow heat transfer?

If an object emits or reflects light

The force of friction on a sliding object is 10n. the applied force needed to maintain a constant velocity is:

What is the best hypothesis to use for this investigation

Quantum physics would most likely be needed to understand the motion of which of the following? A. an atom B. a cell C. a ball D. a galaxy

Sharon throws a 0.20 Kg with an acceleration of 10 m/s/s. (a) What force did she exert on the ball? (b) What force did the ball exert on her?

What are three ways that extra carbon is getting to the atmosphere?