Which formula is dimensionally consistent with an expression yielding a value for velocity? (a is acceleration, x is distance, and t is time)
a. v/t2
b. vx2
c. v2/t
d. at
d
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A moving cue ball strikes another ball of equal mass that is initially at rest on the flat planar surface of the pool table. If the collision is elastic, the direction of the velocity of the cue ball after the collision will be ________ to the direction of the velocity of the other ball.
What will be an ideal response?
In the equation E = hf, the symbol f stands for
A) wave frequency. B) wavelength. C) rate at which photons are emitted. D) none of the above
Sound: A plucked guitar string produces a sound wave of frequency 0.44 kHz on a day when the speed of sound is 340 m/s.(a) What is the wavelength of the sound wave?(b) How much time elapses between the impacts of two adjacent compressions of the sound wave on your eardrum?
What will be an ideal response?
Mort and Velma are twins, born at the same time on Earth. Velma is taken on a long trip into outer space, at a speed close to lightspeed, and returns to Earth. When she returns,
A) Mort observes that he is younger than Velma, but Velma will observe that she is younger than Mort. B) Mort and Velma observe that they have aged equally. C) Mort observes that he is older than Velma, and Velma observes that she is older than Mort. D) Mort and Velma both observe that Velma is older than Mort. E) Mort and Velma both observe that Mort is older than Velma.