The two names most associated with the discovery of Pluto are
A) Adams and Leverrier.
B) Herschel and Bode.
C) Kuiper and Whipple.
D) Lowell and Tombaugh.
E) Shoemaker and Levy.
D
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Spheres of Charge: In the figure, a conducting sphere of radius r1 = 0.050 m is placed at the center of a spherical conducting shell of inner radius r2 = 0.100 m and outer radius r3 = 0.140 m. The inner sphere carries an excess charge of -4.0 nC. The outer spherical shell carries a net excess charge of 3.0 nC. Calculate the magnitude of the electric field at the following distances r from the center of the spheres. (k = 1/4??0 = 9.0 × 109 N ? m2/C2) (a) r = 0.075 m (in the air space between spheres),(b) r = 0.120 m (in the metal of the spherical shell), and(c) r = 0.200 m (outside the spherical shell).
What will be an ideal response?
A 5.00 kg mass is located at (2.00 m, 0.00 m, 0.00 m) and a 3.00 kg mass is located at (0.00 m, 4.00 m, 0.00 m). The center of gravity of the system of masses is
A. (1.25 m, 1.25 m, 0). B. (1.50 m, 1.50 m, 0). C. (1.25 m, 1.50 m, 0). D. (1.50 m, 1.25 m, 0). E. (1.00 m, 1.00 m, 0).
This bar graph is based on statistical study of results from the Kepler mission. Which of the following conclusions is supported by the graph?
A) At least about 15% of stars have a planet similar in size to Earth. B) Most stars with an Earth-sized planet do not have any larger jovian planets orbiting far from their stars. C) Most stars have five planets. D) A star orbited by a super-Earth is likely also to be orbited by a mini-Neptune.
Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? (There could be more than one correct choice.)
A) The speed of the object is constant but its velocity is not constant. B) The acceleration of the object is +g when the object is rising and -g when it is falling. C) The acceleration of the object is zero at its highest point. D) The speed of the object is zero at its highest point. E) The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.