Collisions in Two Dimensions: A 900-kg car traveling east at 15.0 m/s suddenly collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together after the collision. What is the speed of the wreckage just after the collision?
A. 6.10 m/s
B. 12.2 m/s
C. 25.0 m/s
D. 35.0 m/s
E. 17.3 m/s
Answer: B
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An electron and a positron (antielectron), both nearly at rest, collide. What particle(s) is(are) produced?
a. One photon of energy 1.02 MeV b. Two photons of energy 511 keV c. A pi-meson d. A K-meson and an anti-neutrino
The root mean square speed of a gas molecule is greater than the average speed, because the former gives a greater weight to
a. lighter molecules. b. heavier molecules. c. lower speeds. d. higher speeds. e. more probable speeds.
A rocket in space fires its engines continuously until it runs out of fuel. Describe the motion of the rocket.
A. The rocket's speed is a constant value until the engines stop firing, and then coasts to a stop. B. The rocket's speed increases until its engines stop firing, and then coasts to a stop. C. The rocket does not move, as the engines have nothing to push against. D. The rocket's speed does not change, and it continues to move in a straight line. E. The rocket's speed increases until its engines stop firing, and then coasts in a straight line.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If vector
is added to vector , the result is 
. If is subtracted from 
, the result is 
. What is the direction of (to the nearest degree)?
A. 225°
B. 221°
C. 230°
D. 236°
E. 206°