When you look into a clear pond, a fish may appear to be in a different position than it actually is. What is this caused by?

A. diffraction

B. dispersion

C. refraction

D. reflection,

In space, astronauts use an electrical medium to talk to each other ... Why?

Describe the organization of our solar system. What are the different divisions, or categories?

What do we mean by the interstellar medium?

What did scientists predict the big bang should have left?

7. The diagram illustrates the differences between the skulls and brain volumes of three extinct hominins. In each drawing in the diagram, the shaded area inside the skull indicates the size of the brain.

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

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.