A thick-walled metal pipe of length 20.0 cm has an inside diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the total surface area of the pipe, counting the ends, in square centimeters?
A) 276 cm2
B) 277 cm2
C) 278 cm2
D) 279 cm2
D
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Compared to a cold molecular cloud at 10 K, an HII region has a temperature about
A. 1,000 times hotter. B. 10 times hotter. C. 1,000,000 times hotter. D. the same.
Dallas says that any change in velocity is directly proportional to the time interval over which the change took place. Dana says that is true only when the acceleration is constant. Which one, if either, is correct?
A.
B.
so that ?vx = ?t. C.
always is equal to 
.D.
E.
A simple pendulum, 1.00 m in length, is released from rest when the support string is at an angle of 48.0° from the vertical. What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance)
a. 4.43 m/s b. 3.82 m/s c. 6.49 m/s d. 2.55 m/s e. 1.62 m/s
A ball is thrown up in the air with an initial velocity of 58.8 m/s upward. How long does it take the ball
a. to go up? b. to come down after reaching maximum height?