A 6-kg object is moving to the right at 4 m/s and collides with a 4-kg object moving to the left at 6 m/s. The objects collide and stick together. After the collision, the combined object:
a. has the same kinetic energy that the system had before the collision.
b. has more kinetic energy than the system had before the collision.
c. has no kinetic energy.
d. has less momentum than the system had before the collision.
C
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to 
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A. 159 J B. 125 J C. 102 J D. 172 J
A metal block has a density of 5000 kg per cubic meter and a volume of 2 cubic meters. What is the block's mass?
A) 1000 kg B) 2500 kg C) 5000 kg D) 10,000 kg E) none of the above
Which of the following is a problem inherent in all large radio telescopes?
A) They are badly affected by poor seeing and atmospheric turbulence. B) The lightest breeze shakes them, making the observations blurry. C) Their waves are blocked by water vapor, so they must be located in deserts. D) Radio waves have long wavelengths, so radio telescopes have poor resolution. E) The dust clouds in the Milky Way block almost all wavelengths except light.
A spaceship, which has length 35 m and width 16 m when at rest, is moving in a direction along its length at a speed where its length contraction results in a 28-m length measured by a stationary observer. What would the measured width be in this case?
a. between 18 and 20 m b. 16 m c. 13 m d. less than 13 m e. 20 m