The lengthening of the wavelength of a photon as it escapes from a gravitational field is known as__________
A) gravitational blueshift
B) gravitational redshift
C) photonic adaptation
D) photon occultation
B
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When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal speed. Once he has reached terminal speed
A) his acceleration is equal to g. B) the force of air drag on him is equal to zero. C) the force of air drag on him is equal to g. D) his speed is equal to g. E) the force of air drag on him is equal to his weight.
Subduction of higher density oceanic plates under the continents not only creates deep trenches but also tall volcanic chains ashore as well
Indicate whether the statement is true or false
The frictional force, due to air resistance, acting on an object is always
A. in the direction of the object's motion. B. in the upward direction. C. greater than the net force. D. smaller than object's weight. E. in the opposite direction to the object's motion.
When playing tennis, if you hit the ball off of the top end of the racket, an uncomfortable standing wave vibration is produced in the racket. This wave is
A. longitudinal. B. transverse. C. neither longitudinal nor transverse. D. both longitudinal and transverse.