A 2200-kg auto moving northward at 12.0 m/s runs into a 3800-kg truck which is also moving northward, but at 5.00 m/s
If the vehicles lock bumpers, how fast are they moving just after the collision?
7.57 m/s
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A blue photon
A) has a smaller wavelength than a red photon and travels with the same speed. B) has a smaller wavelength than a red photon and travels with a greater speed. C) has a longer wavelength than a red photon and travels with the same speed. D) has a longer wavelength than a red photon and travels with a greater speed.
A student is sleeping under a small goose-down comforter that has coefficient of thermal conductivity of 0.025 W/m 
The thickness of the down comforter is 5.0 cm and the area of the comforter is 2.0 m2. If the temperature difference between inside of the comforter and the outside of the comforter 40
then what is the rate of heat flow through the comforter?
A. 10 W B. 20 W C. 30 W D. 40 W E. 50 W
At the speed of light, how long would it take to reach the nearest star, Alpha Centauri?
a. about a month b. about a year c. about 4 years d. about 1000 years e. about 1,000,000 years
The mean life of muons is 2.2
How fast are they moving if their measured mean life is 1.1 
A. 0.50 c B. 0.87 c C. 0.56 c D. 0.94 c E. This cannot happen.