What determines how rapidly a star burns up its fuel?
A. the temperature in its core
B. its mass
C. its luminosity
D. the pressure in its core
E. All of these choices are correct.
Answer: E
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A conical pendulum is constructed with a string 2.00 m in length. The pendulum is set in horizontal circular path the vertical axis. If the angle the string makes with the vertical axis is 45.0 degrees, then the angular velocity of the conical pendulum is
A. 4.00 rad/s. B. 3.55 rad/s. C. 3.04 rad/s. D. 2.63 rad/s. E. 2.01 rad/s.
Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 12-1. What is her angular displacement (in rad) in the first 8 minutes?
A. 0 B. ? C. 4? D. 8? E. 16?
A mass is suspended from a string in an airplane. As the plane is in the process of taking off, it is found that the string, instead of being vertical, hangs at an angle of 13° from the vertical. What is the acceleration of the plane at this time?
a. 2.3 m/s2 c. 9.1 m/s2 b. 3.8 m/s2 d. 3.5 m/s2
A hot pizza contains
a. heat b. internal energy c. temperature d. work e. none of the above