In a nuclear reactor, the control rods must be able to
A) absorb neutrons.
B) absorb 235U.
C) slow neutrons down without absorbing them.
D) remove the heat from the fissioning uranium.
E) absorb 238U.
A
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A main difference between a radio wave and a sound wave is
A) frequency. B) wavelength. C) energy. D) amplitude. E) medium or no medium.
Exhibit 12-2
The figure below shows a graph of angular velocity versus time for a man bicycling around a circular track.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 12-2. What is his average angular acceleration, in rad/s2, in the period from t = 6 min to t = 8 min?
A.
B.
C.
D.
E.
A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building. If g = 9.8 m/s2 and air resistance is negligible, then what is the speed of the rock as it hits the ground?
a. 30 m/s c. 34 m/s b. 32 m/s d. 36 m/s
Equations are used to
A. All of the above B. describe how quantities change together C. define a concept D. describe a property