Elements heavier than hydrogen and helium constitute about ________ of the mass of the interstellar medium
A) 0.002%
B) 2%
C) 70%
D) 98%
B
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Gravitational Potential Energy: You and your friend, who weighs the same as you, want to go to the top of the Eiffel Tower. Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking longer to do so. Compare the gravitational potential energy of you and your friend, after you both reach the top.
A. It is impossible to tell, since the times you both took are unknown. B. It is impossible to tell, since the distances you both traveled are unknown. C. Your friend's gravitational potential energy is greater than yours, because he got to the top faster. D. Both of you have the same amount of gravitational potential energy at the top. E. Your gravitational potential energy is greater than that of your friend, because you traveled a greater distance in getting to the top.
When Paul compresses air with a tire pump, the temperature of the compressed air
A) drops. B) remains unchanged. C) increases as work is done on it. D) none of the above
Upon what data do measurements of sizes of eclipsing binaries depend?
A) their orbital periods and separations B) their masses and luminosities C) their Doppler shifts and durations of stages of their eclipses D) their temperatures and speeds E) their temperatures and masses
How did the discovery of pulsars by Jocelyn Bell lead to the winning of a Nobel Prize by Anthony Hewish?
What will be an ideal response?