On a position-time graph for a particle, suppose the plot starts at some positive position and as the time goes on the curve gets steeper and steeper while curving upwards. Which of the following must be true?
a. The speed of the particle is constant.
c. The speed of the particle is decreasing.
b. The acceleration of the particle is constant.
d. The acceleration of the particle is positive.
D
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Of all the planets, the axial tilt and rotation period of ________ is most like our own
A) Earth B) our Moon C) Venus D) Mars E) Mercury
Cart A, of mass m, starts from rest and travels in a straight line with acceleration a. It reaches velocity v in time t. Cart B, of mass 4m, starts from rest and travels in a straight line with acceleration 
. At time t it has reached velocity
A.
.B.
.C.
D.
E.
What are the seasons like on a planet whose rotation axis is NOT tilted with respect to its orbital plane?
A) shorter than those on Earth. B) longer than those on Earth. C) the same as those on Earth. D) Reversed from those on Earth (winter, fall, summer, spring). E) there are no seasons.