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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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.
Through what potential must an electron be accelerated to observe maximum diffraction at 70.0° to the surface of a crystal with 0.334 nm between surface planes?
What will be an ideal response?
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.
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