Which of the following stars has the hottest surface temperature?
A) the blue star
B) the orange star
C) the green star
D) the red star
E) the yellow star
A) the blue star
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A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
A. 60 m B. 28 m C. 44 m D. 12 m E. 88 m
The piston of a cylinder containing a quantity of ideal gas is advanced so that the volume of the gas is decreased by one-half. A pressure gauge on the cylinder shows the pressure of the gas to have increased threefold in the process. By what factor does the temperature of the gas change?
Why doesn't Mars have a stratosphere?
A) It is too far from the Sun. B) Its atmosphere does not contain enough of an ultraviolet-absorbing gas. C) Its atmosphere does not contain enough greenhouse gases. D) It is too small in size. E) It lacks a strong enough magnetic field.
The dense, rocky, and metallic planets are found close to the Sun because:
a. the Sun’s gravity attracted the denser particles (rocks and metals) closer to it. b. the Sun was unable to hold onto the lighter (gaseous) particles and they moved farther away where they formed the outer planets. c. rocks and metals condensed at the relatively high temperatures close to the Sun. d. they were nudged inward by close encounters with Jupiter early in the solar system’s history.