If we see two objects that have different colors, the light waves coming from them have different ____________
Fill in the blank(s) with correct word
frequencies (or wavelengths)
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The average distance from Earth to the Sun is called the__________
A) astronomical unit B) light-year C) radius of curvature D) focal length
Cart A, of mass m, starts from rest and travels in a straight line with acceleration a. It reaches velocity v in time t. Cart B, of mass 4m, starts from rest and travels in a straight line with acceleration 
. At time t it has reached velocity
A.
.B.
.C.
D.
E.
The linear momentum of a truck will be greater than that of a bus if
a. the truck's mass is larger than the bus's but its speed is the same b. the truck's speed is larger than the bus's but its mass is the same c. the truck's mass and speed are both larger than the bus's d. any of the above
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half life of the radioisotope is
a. 3 minutes b. 4 minutes c. 6 minutes d. 8 minutes e. 12 minutes