A car heading north collides at an intersection with a truck of the same mass as the car heading east. If they lock together and travel at 28 m/s at 46° north of east just after the collision, how fast was the car initially traveling?
Assume that any other unbalanced forces are negligible.
A) 40 m/s
B) 20 m/s
C) 80 m/s
D) 30 m/s
Answer: A
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If ice at -40°C is added to water at +40°C, what final temperature will result?
1.It must be below 0°C. 2.It must be 0°C. 3.It must be above 0°C. 4.It can be below 0°C, 0°C, or above 0°C.
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the highest point, where
is the normal force, 
is weight, and 
is tension?
a.
b.
c.
d.
e.
Semiconductors: The energy gap between the valence and conduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substance? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 599 nm B. 959 nm C. 873 nm D. 994 nm
About how many 100-W light bulbs would you have to light up to use energy at the rate of one horsepower?
a. one or two b. seven or eight c. the question doesn't make sense—hp and W are unrelated d. dozens e. none of the above