When light passes from a material with a high index of refraction into material with a low index of refraction:
a. none of the light is reflected.
b. some light is reflected without a change of phase.
c. some light is reflected with a 180° change of phase.
d. the light that is not reflected has a 180° change of phase.
b
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Millisecond pulsars that are very old are
a. believed to be the result of mass transfer from a companion that increases the spin of the pulsar. b. all single objects. c. not spinning as rapidly they seem because they have four hot spots that produce the flashes. d. X-ray binaries. e. gamma-ray bursters.
Newton's 2nd Law of Motion states that
A) action and reaction are equal and opposite B) force equals mass times acceleration C) an object moves at a constant velocity unless a force acts D) the force of gravity decreases with increasing distance
An airplane in a wide sweeping "outside" loop can create zero gees inside the aircraft cabin. What must be the radius of curvature of the flight path for an aircraft moving at 150 m/s to create a condition of "weightlessness" inside the aircraft?
a. 1 150 m b. 1 800 m c. 2 300 m d. 3 600 m
A car travels around an unbanked highway curve (radius 0.15 km) at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.80 kN?
a. 0.87 kN b. 0.34 kN c. 0.80 kN d. 0.00 kN e. 0.67 kN