A heavy frog and a light frog jump straight up. They push off in such a way that they both have the same kinetic energy just as they leave the ground. Assume air resistance is negligible
Which of the following statements about these frogs are correct? (There could be more than one correct choice.) A) Just as they leave the ground, the heavier frog is moving faster than the lighter frog.
B) Just as they leave the ground, the lighter frog is moving faster than the heavier frog.
C) They both leave the ground with the same speed.
D) The lighter frog goes higher than the heavier frog.
E) The heavier frog goes higher than the lighter frog.
F) Both frogs reach the same maximum height.
B, F
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Two charged objects attract one another with a force F. If the charge on both objects is doubled and the distance between them is also doubled, what will be the force between them?
Interstellar dust consists mostly of
A) microscopic particles of carbon and silicon. B) ozone "smog." C) hydrogen and helium atoms. D) tiny grains of water ice. E) the same tiny particles found in household dust.
Which of the following best explains the hypothesized phenomenon of black hole evaporation?
A) Particles (or anti-particles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. B) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. C) Particles (or anti-particles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists, but doesn't really occur.
An achromatic lens
a. is used to correct spherical aberration in reflecting telescopes. b. is used to correct chromatic aberration in refracting telescopes. c. is used to correct spherical aberration in refracting telescopes. d. is used to correct chromatic aberration in reflecting telescopes. e. contains two mirrors and focuses the light back through the primary mirror.