A really high-speed train moves in a direction parallel to its length with a speed that approaches the speed of light. The height of the train, as measured by a stationary observer on the ground,
A) approaches infinity.
B) approaches zero.
C) increases slightly.
D) decreases slightly.
E) does not change due to the motion.
E
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Projectile Motion: A projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km. If there was no air resistance, at what angle above the horizontal did it leave the ground?
Fill in the blank(s) with the appropriate word(s).
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 25 radians per seconds, then the tangential velocity of a point on the circumference is
A. 1.0 m/s. B. 1.5 m/s. C. 2.0 m/s. D. 2.5 m/s. E. 3.0 m/s.
Specific gravity is a number representing the ratio of a mineral's weight to the weight of an equal volume of water.
TRUE FALSE
Protostars are difficult to observe because
a. the protostar stage is very short. b. they are surrounded by cocoons of gas and dust. c. they radiate mainly in the infrared. d. all of the above e. they are all so far away that the light hasn't reached us yet.