Suppose David Ortiz hits a home run which travels 361. feet (110. m). Assuming it left the bat at 50.°, how fast was it hit?
What will be an ideal response?
33.1 m/s
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What nuclear fusion mechanism does an isolated white dwarf use to generate energy?
a. Proton-proton chain b. CNO cycle c. Triple alpha process d. White dwarfs don't generate their own energy.
Capacitance: If the electric field between the plates of a given air-filled capacitor is weakened by removing charge from the plates, the capacitance of that capacitor
A. increases. B. decreases. C. does not change. D. It cannot be determined from the information given.
Pressure in a Liquid: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the absolute (total) pressure p on the bottom of this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
This photograph shows a small portion of the Sun's photosphere. What is going on in the bright regions (such as the bright region indicated by the arrow)?
A) Hot gas is rising up from the solar interior. B) Cool gas is falling back down into the solar interior. C) The bright spots are regions of unusually intense magnetic fields. D) The bright spots are what we call sunspots.