A hydraulic press has its input piston depressed 20 centimeters while the output piston is raised 1 centimeter. A 1-newton input can lift a load of
A) 1 N.
B) 10 N.
C) 15 N.
D) 20 N.
E) none of the above
Answer: D
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Interactions among galaxies also are thought to influence a galaxy's type in at least some cases. Which of the following does not support the idea that interactions can shape galaxies?
A) the presence of features, such as "tails" extending out of galaxies, bridges between galaxies, and rings of stars around galaxies B) the fact that galaxies with distorted appearances are more common at great distances than nearby C) computer modeling of collisions between galaxies D) the fact that more distant galaxies have larger redshifts
If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = 80 nC, and q = 32 nC in the figure, what is the magnitude of the electric force on q?
a.
1.6 N
b.
1.3 N
c.
1.9 N
d.
2.2 N
e.
0.040 N
Samus is exploring the planet Zebes in the star system Metroid Prime (where the laws of physics are the same as on Earth and in our universe) in a ship moving at constant velocity. She turns on her headlamps as she encounters some strange fog. Ridley, the villain lying in wait, is at rest with respect to Samus. The speed of the light from Samus's headlamps as measured by Ridley depends most
importantly on
Is it possible, according to Einstein's relativity, for a child to be biologically older than his or her parents?
A) Yes, if the parents go on a long and fast trip and return to Earth. B) Yes, if the child goes on a long and fast trip and returns to Earth. C) No, because it is not possible to actually move backward through time. D) No, because the principles of relativity don't have anything to do with actual biological aging. E) No, because the "relativity of time" does not allow the actual order of events in time to be switched around.