LCD stands for:
a. linearly collimated diffraction.
b. longitudinally combined depolarization.
c. liquid crystal display.
d. lighted compact disk.
c
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In the diagram below, what is the diameter of Mercury?
a. about 240 km
b. about 2400 km
c. about 24,000 km
d. about 240,000 km
e. about 2.4´106 km
You are standing on a skateboard, initially at rest. A friend throws a very heavy ball towards you
You have two choices about what to do with the ball: either catch the ball or deflect it back toward your friend with the same speed as it was originally thrown. Which choice should you make in order to maximize your speed on the skateboard? A) Deflect the ball back. B) Catch the ball. C) Your final speed on the skateboard will be the same regardless whether you catch the ball or deflect the ball.
A meteor having a mass of 1000 kg moves through outer space, far from all planets and stars and far from all gravitational influences, at a speed of 20 km/s (20,000 m/s). How much work is done on the meteor during a time interval of one second?
A) 20 × 106 J B) 20 J C) 1000 J D) 20 000 J E) None of the above.
A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. If the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object?
A) It loses 0.23 J. B) It gains 0.69 J. C) It loses 0.47 J. D) It loses 1.4 J. E) The energy of the object is unchanged.