A miniature, spring-loaded, radio-controlled gun is mounted on an air puck. The gun's bullet has a mass of 6.00 g, and the gun and puck have a combined mass of 130 g. With the system initially at rest, the radio-controlled trigger releases the bullet, causing the puck and empty gun to move with a speed of 0.500 m/s. Of the total kinetic energy of the gun-puck-bullet system, what percentage is in
the bullet?
a. 4%
b. 98%
c. 96%
d. 23%
e. 100%
c
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Waves on a String: The speed of sound in steel is 5000 m/s. What is the wavelength of a sound wave of frequency 660 Hz in steel?
A. 7.58 m B. 2.41 m C. 1.21 m D. 0.829 m E. 0.132 m
On the scale of the cosmic calendar, in which the history of the universe is compressed into 1 year, when did the dinosaurs become extinct?
A) in late December B) in late November C) in late October D) in late September E) in late August
Uranium serves as the source of the Sun's energy because
a. uranium atoms can be fissioned into lighter atoms and energy. b. uranium atoms can be fused into helium and energy. c. uranium atoms can be fused into hydrogen and energy. d. none of the above because fusion of hydrogen atoms serves as the Sun's source of energy. e. none of the above because fusion of helium atoms serves as the Sun's source of energy.
The supermassive black hole at the center of the galaxy is:
A.) 15 light-years away. B.) 300 light-years away. C.) 8,800 light-years away. D.) 26,000 light-years away. E.) 90,000 light-years away.