Air pressure is 1.0 × 10^5 N/m2, air density is 1.3 kg/m3, and the density of soft drinks is 1.0 × 10^3 kg/m3 . If one blows carefully across the top of a straw sticking up 0.080 m from the liquid in a soft drink can, it is possible to make the soft drink rise half way up the straw and stay there. How fast must the air be blown across the top of the straw?
a. 76 m/s
c. 25 m/s
b. 27 m/s
d. 0.99 m/s
C
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Kinetic Energy: How many joules of energy are required to accelerate a 1.0-kg rock from rest to a speed of 0.866c? (c = 3.0 × 108 m/s)
A. 1.8 × 1017 J B. 9.0 × 1016 J C. 3.0 × 103 J D. 3.3 × 1016 J
Compared to a sound of 40 decibels, the intensity of a sound of 50 decibels is
A) 10 times as much. B) 100 times as much. C) 1000 times as much. D) 10,000 times as much. E) more than 10,000 times as much.
Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
?
?
Use this exhibit to answer the following question(s).
Refer to . What is her angular displacement (in rad) in the first 8 minutes?
a.
0
b.
?
c.
4?
d.
8?
e.
16?