A ball is rolled up an incline so that it goes part-way up and then rolls back down. Which of the graphs below could represent its acceleration vs. time from the instant it is released until it returns to where it started?
3
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The figure is a graph of 
for a car. Solve graphically for the distance traveled from t = 10 s to t = 15 s.
A. 75 m
B. 70 m
C. 67 m
D. 69 m
Intensity of Sound: A barking dog delivers about 1.0 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level in decibels at a distance 5.00 m from the dog? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 61 dB B. 63 dB C. 65 dB D. 68 dB
A ceiling fan is turned on and reaches an angular speed of 60 rev/min in 20 s. It is then turned off and coasts to a stop in 40 s. In the one minute of rotation, through how many revolutions did the fan turn?
a. 30 c. 0 b. 60 d. 600
The sky is blue because of
a. interference b. diffraction c. scattering d. dispersion e. polarization