A 4-kg box is pushed across a level floor with a force of 60 N for a displacement of 20 m, then lifted to a height of 2 m. What is the total work done on the box?
(A) 200 J
(B) 400 J
(C) 1120 J
(D) 1200 J
(E) 1280 J
Ans: (E) 1280 J
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In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. Earth was at the center of the universe. e. None of the above was believed.
Resistance and Resistivity: Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare?
A. Both wires have the same resistivity. B. The longer wire has 3 times the resistivity of the shorter wire. C. The longer wire has 9 times times the resistivity of the shorter wire. D. The longer wire has 27 times times the resistivity of the shorter wire.
Supernovas are thought to always result in
A) neutron stars. B) red giant stars. C) regular stars like our Sun. D) white dwarfs. E) black dwarfs.
Elements heavier than hydrogen and helium constitute about ________ of the mass of the Milky Way's interstellar medium.
A) 0.002 % B) 2 % C) 70 % D) 98%