How much stronger is the gravitational pull of the Sun on Earth, at 1 AU, than it is on Saturn at 10 AU?
A) 5X
B) 10X
C) 25X
D) 100X
E) 250X
D
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What change in the Sun during the solar system's history is thought to be important to understanding the climates of Venus, Earth, and Mars?
A) a gradual brightening with time B) a gradual dimming with time C) a gradual weakening of the solar wind with time D) a gradual reduction in the amount of ultraviolet and x-ray radiation coming from the Sun
Rotation causes the cocoon of dust to flatten into a dusty disk around protostars
Indicate whether the statement is true or false
When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is 
. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ?sphere at the spherical surface to the flux ?cube at the surface of the cube is
A.
.B.
.C.
D.
.E.
.A rock is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration of objects in free fall is 1.5 m/s2 and there is no atmosphere. What is the maximum height reached by the laser?
A) 8.0 m B) 18 m C) 48 m D) 144 m