An object is moving with constant non-zero acceleration in the +x direction. The velocity versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axis.
D) a parabolic curve.
C
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Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
and 
, what is the direction of the vector 
?
A. ?49°
B. ?41°
C. ?90°
D. +49°
E. +21°
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37° south of west. Which of the following is correct?
A. R = 0.40 km, and the car's speed is decreasing. B. R = 0.20 km, and the car's speed is decreasing. C. R = 0.20 km, and the car's speed is increasing. D. R = 0.16 km, and the car's speed is increasing. E. R = 0.16 km, and the car's speed is decreasing.
Two protons are fired toward each other in a particle accelerator, with only the electrostatic force acting. Which of the following statements must be true about them as they move closer together? (There could be more than one correct choice.)
A) Their kinetic energy keeps decreasing. B) Their electric potential energy keeps decreasing. C) Their electric potential energy keeps increasing. D) Their kinetic energy keeps increasing. E) Their acceleration keeps decreasing.
The Richter magnitude scale measures an earthquake's
A) frequency. B) energy in terms of ground shaking. C) damage. D) all of the above