If Mars had a thicker atmosphere with a strong greenhouse effect, the outer boundary of the Sun's habitable zone would lie
A) roughly halfway between the orbit of the Earth and Mars
B) just within the orbit of Mars
C) roughly halfway between the orbit of Mars and Jupiter
D) just beyond the orbit of Mars
Question 2A 30. N stone is dropped from a height of 10. m, and strikes the ground with a velocity of 13. m/s. What average force of air friction acts on it as it falls?
A) 7.2 N
B) 2.9 N
C) 1.2 N
D) 4.1 N
E) 0.13 KN
Question 3Two charged objects attract each other with a certain force. If the charges on both objects are doubled with no change in separation, the force between them
A) becomes zero.
B) doubles.
C) halves.
D) quadruples.
E) increases, but we can't say how much without knowing the distance between them.
Question 4When a baseball pitcher throws a curve ball, he makes the ball spin about an axis ________ the direction in which the ball's center of mass is moving.
A) parallel to
B) perpendicular to
C) 45 with respect to
Question 5Satellite A has twice the mass of satellite T, and rotates in the same orbit. Which of the following is true?
A) The speed of T is twice the speed of A.
B) The speed of T is one-fourth the speed of A.
C) The speed of T is half the speed of A.
D) The speed of T is three-fourths the speed of A.
E) The speed of T is equal to the speed of A.
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