Collisions in Two Dimensions: A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the speed of the cars after collision?
A. 8.3 m/s
B. 14 m/s
C. 17 m/s
D. 22 m/s
Answer: B
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Gasoline has a coefficient of volume expansion of 
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What is the volume of gasoline that overflows the tank (ignore the expansion of the gas tank)?
A. 3.95 liters B. 3.11 liters C. 2.67 liters D. 2.09 liters E. 1.55 liters
An electrically neutral metal sphere hangs from an insulating thread. A charged glass wand is brought near to the sphere. Describe what occurs next:
A. The sphere is attracted to the wand B. The sphere is neither attracted nor repelled, since it is electrically neutral C. The sphere is repelled by the wand D. The sphere will become charged
A star of magnitude 1 appears _______________ times brighter than a star of magnitude 2
a. 5.21 b. 3.14 c. 10 d. 2.51
An infrared thermometer operates by way of
A) temperature differences. B) radiant energy invisible to humans. C) conduction, convection, and radiation. D) none of the above