Charge of uniform linear density 6.0 nC/m is distributed along the x axis from x = 0 to x = +3 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point y = +4 m on the y axis?
A.
B.
C.
D.
E.
Answer: A
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Buoyancy: A solid sphere of mass 8.6 kg, made of metal whose density is 3400 kg/m3, hangs by a cord. When the sphere is immersed in a liquid of unknown density, the tension in the cord is 38 N. The density of the liquid is closest to which one of the following values?
A. 1900 kg/m3 B. 1700 kg/m3 C. 1600 kg/m3 D. 1500 kg/m3 E. 1400 kg/m3
In a volcanic eruption, 2km3 of mountain with a density of 1600 kg=m3 was lifted an average height of 513m.
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Why do the patterns of the stars in our sky look the same from year to year?
A) because the stars in the constellations are so far away B) because the stars in the constellations are not moving C) because the stars in the constellations all move at the same speeds and in the same directions, so they don't change their relative positions D) because the stars in the constellations typically move so slowly – typically about the speed of a snail – that their motions are not noticeable
You and your friend, who has the same mass 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 the system you-Earth and your friend-Earth, 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) The friend-Earth system's gravitational potential energy is greater than the you-Earth system's gravitational potential energy, because he got to the top faster. D) Both systems have the same amount of gravitational potential energy at the top. E) The you-Earth system's gravitational potential energy is greater than the friend-Earth system, because you traveled a greater distance in getting to the top.