In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s. How long does it take for the train to be 180 m ahead of the car?
A. 2.0 s
B. 3.0 s
C. 6.0 s
D. 9.0 s
E. 18.0 s
Answer: C
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The vast majority of stars in a newly formed star cluster are
A) very high-mass, type O and B stars. B) red giants. C) about the same mass as our Sun. D) less massive than the Sun.
A 1000-kg automobile moving with a speed of 24 m/s relative to the road collides with a 500-kg automobile initially at rest. If the two stick together, what is the velocity in m/s of the two cars after the collision according to an observer in a truck moving 10 m/s in the same direction as the moving cars?
a. 6 b. 11 c. 24 d. 26 e. 31
A segment of wire of total length 3.0 m carries a 15-A current and is formed into a semicircle. Determine the magnitude of the magnetic field at the center of the circle along which the wire is placed
a. 1.6 ?T b. 4.9 ?T c. 1.0 ?T d. 9.8 ?T e. 15 ?T
Binary star systems are thought to form when
A) gravity pulls two neighboring protostars quite close together, but angular momentum causes them to orbit each other rather than collide. B) two interstellar gas clouds happen to contract so close together that there's no room for a disk or planets. C) the protostellar disk around a protostar has enough material to form a second star. D) a protostar emits two jets, each of which turns into a star.