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. In what direction does the wreckage move just after the collision?
A) 36.9° N of E
B) 42.0° N of E
C) 45.0° N of E
D) 53.1° N of E
E) 48.0° N of E
E
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The wavelength of a periodic wave is 0.500 m. If the frequency is 400 Hz, then what is the magnitude of the k vector of the wave?
A. 12.6 
B. 14.8
C. 18.4
D. 21.0
E. 25.9
Recall the raisin cake model of the universe and its analogy to our expanding universe. Suppose you measure the recession velocity (the speed at which any object is moving away from us) of Galaxy A to be 2000 km/s and the recession velocity of Galaxy B to be 6000 km/s. What can you conclude about the relative distances of these two galaxies?
A) Galaxy A is 3 times as far from us as Galaxy B. B) Galaxy B is 3 times as far from us as Galaxy A. C) Galaxy A is 6 times as far from us as Galaxy B. D) Galaxy B is 6 times as far from us as Galaxy A. E) The relative distances cannot be determined from the information in this problem.
A 1.0-kg object moving 9.0 m/s collides with a 2.0-kg object moving 6.0 m/s in a direction that is perpendicular to the initial direction of motion of the 1.0-kg object. The two masses remain together after the collision, and this composite object then collides with and sticks to a 3.0-kg object. After these collisions, the final composite (6.0-kg) object remains at rest. What was the speed of the 3.0-kg object before the collisions?
A. 15 m/s B. 10 m/s C. 5.0 m/s D. 20 m/s E. 25 m/s
Like supernovae, quasars must end with a violent explosion
Indicate whether the statement is true or false