From Kepler's third law, an asteroid with an orbital period of 8 years lies at an average distance from the Sun equal to
A) 16 astronomical units.
B) 4 astronomical units.
C) 8 astronomical units.
D) 2 astronomical units.
E) It depends on the asteroid's mass.
B
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The assumption of isotropy states that
a. the Universe looks the same at all epochs. b. the Universe looks the same from all locations over sufficiently great distances. c. the Universe looks the same in all directions over sufficiently great distances. d. the Universe looks the same at all epochs, the Universe looks the same from all locations over sufficiently great distances, and the Universe looks the same in all directions over sufficiently great distances. e. None of the other choices are correct.
Block A of mass 8.0 kg and block X are attached to a rope that passes over a pulley. A 50-N force P is applied horizontally to block A, keeping it in contact with a rough vertical face
The coefficients of static and kinetic friction between the wall and block A are ?s = 0.40 and ?k = 0.30. The pulley is light and frictionless. In the figure, the mass of block X is adjusted until block A descends at constant velocity of 4.75 cm/s when it is set into motion. What is the mass of block X? A) 6.5 kg B) 7.2 kg C) 8.0 kg D) 8.8 kg E) 9.5 kg
A 2.00-m-long 6.00-kg ladder pivoted at the top hangs down from a platform at the circus. A 42.0-kg trapeze artist climbs to a point where her center of mass is at the center of the ladder and swings at the system's natural frequency. The angular frequency (in s?1) of the system of ladder and woman is
a. 1.01. b. 3.07. c. 4.03. d. 8.05. e. 16.2.
The index of refraction for red light in water is 1.331 and for blue light is 1.340 . If a ray of white light enters the water at an angle of incidence of 83.00°, what are the underwater angles of refraction for the blue and red components of the light?