Mort observes Velma's light-clock, as Velma passes. Mort thus observes Velma's clock to be
A) slow.
B) on time.
C) stopped.
D) fast.
E) moving backward in time.
A
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A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. What is the acceleration of the crate if the 750-N force is maintained after the crate begins to move and the coefficient of kinetic friction is 0.16?
a. 1.8 m/s2 c. 3.0 m/s2 b. 1.4 m/s2 d. 2.1 m/s2
If the polarizing angle for cubic zirconia (zirconium oxide) is 65.6°, what is the index of refraction of the material?
a. 1.84 b. 2.00 c. 2.20 d. 2.43 e. 1.17
Check all that are functions of the cerebellum.
A. Receives sensory plans for movements B. Acts as the "principal" of unconscious physical actions by regulating functions of motor pathways C. Directly controls the influences of hormones and enzymes on skeletal muscles D. Indirectly affects the excitability of motor neurons
Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere?
A) The Northern Hemisphere is closer to the Sun than the Southern Hemisphere. B) The Northern Hemisphere is "on top" of Earth and therefore receives more sunlight. C) The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight. D) The Northern Hemisphere is tilted away from the Sun and receives more indirect sunlight. E) It isn't: both hemispheres have the same seasons at the same time.