Contrast the speeds of sound and light in watching a flash of lightning, then listening for the thunder to follow
What will be an ideal response?
Light travels at 300,000 km/sec, so the flash of light is almost instantaneous from a few miles away; sound travels at about a fifth of a mile per second, so if the thunder follows the lightning by five seconds, the bolt hit about a mile away.
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The moon with a mass of 
kg is orbiting about the earth with a mass of 
kg at a radius of 
meters. The earth is orbiting about the sun with a mass of 
kg at a radius of 
meters. The force of gravity on the moon when it is between the earth and the sun is 
A. 
N toward the sun.
B. 
N toward the earth.
C. 
N toward the sun.
D. 
N toward the earth.
E. 
N toward the earth.
A carbon atom with six protons, seven neutrons, and five electrons has
State Newton's first law of motion
What will be an ideal response?
Refraction occurs when light passing from one medium to another
A) changes frequency. B) changes speed. C) loses energy. D) reflects inward.