Which of the following statements best describes the difference between a refracting telescope and a reflecting telescope?
A) A refracting telescope uses a transparent glass lens to focus light while a reflecting telescope uses a mirror to focus light.
B) A refracting telescope produces refracted images while a reflecting telescope produces reflected images.
C) Reflecting telescopes make much clearer images than can refracting telescopes of the same size.
D) It is much easier to make a large refracting telescope than a large reflecting telescope.
A
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Calculations show that gravity begins to overcome thermal pressure in clouds that are
A) less massive than the Sun. B) more massive than the Sun. C) more massive than ten times the Sun. D) more massive than a hundred times the Sun. E) more massive than a thousand times the Sun.
You find yourself in a place that looks (except for your own presence) perfectly symmetrical. There is no way to distinguish one place from another, and all forces are one
With this perfect symmetry, there is no obvious way to define the flow of time. Where are you? A) You are in the center of a young star. B) You are in the early universe before the Planck time. C) You are floating somewhere in the universe near its end, 10100 years from now. D) You are inside the nucleus of an atom. E) You are in the universe shortly after inflation.
A student working with a transmitting apparatus like Heinrich Hertz’s wishes to adjust the electrodes to generate electromagnetic waves with a frequency half as large as before. How large should she make the effective capacitance of the pair of electrodes?
1.four times larger than before 2.two times larger than before 3.one-half as large as before 4.one-fourth as large as before 5.none of those answers
Car A (mass = 1000 kg) moves to the right along a level, straight road at a speed of 6.0 m/s. It collides directly with car B (mass = 200 kg) in a completely inelastic collision
What is the momentum after the collision if car B was initially at rest? A) 2.0 KN-s to the right B) 6.0 KN-s to the right C) 8.0 KN-s to the left D) 10. KN-s to the right E) zero