The electron microscope is based on the use of
A) X-rays.
B) high-frequency sound waves.
C) matter waves.
D) electromagnetic waves.
E) mesons.
C
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Relative Velocity: On a calm day with no wind, you can run a 1500-m race at a velocity of 4.0 m/s. If you run the same race on a day when you have a constant headwind that slows your speed by 2.0 m/s, how much time would it take you to finish the race?
A. 250 s B. 750 s C. 1125 s D. 9000 s
Equilibrium: A 10.0-kg picture is held in place by two wires, the first one hanging at 50.0° to the left of the vertical and the second one at 45.0° to the right of the vertical. What is the tension in the first wire?
A. 69.6 N B. 50.8 N C. 98.1 N D. 69.4 N E. 23.8 N
A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the
A) air resistance on the ball. B) weight of the ball. C) force that the ball exerts on the bat. D) grip of the player's hand against the ball. E) weight of the bat.
This graph shows the adjustment factor versus the ratio of the speed of the system or object to the speed of light. The graph implies that, if travel at speed c were possible, a clock traveling at the speed of light would stop
a. True. b. False. c. It is impossible to know.