What is the relativistic kinetic energy of an electron moving at a speed of 2.30 × 10^8 m/s? (electron mass is 9.11 × 10^?31 kg and c = 3.00 × 10^8 m/s)
a. 4.57E–14 J
b. 1.28E–13 J
c. 5.26E–14 J
d. 3.38E–14 J
e. 8.20E–14 J
a
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A block holding a ringing tuning fork oscillates back and forth, attached to a wall by a spring of spring on a horizontal, frictionless surface, with amplitude 17 cm. The mass of the tuning fork and block together is 0.75 kg. An observer who is situated so that the block’s direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the period of motion of the block? The speed of sound at the time of the experiment is 340 m/s.
A. Cannot do without knowing the spring constant. B. 0.28 s C. 0.14 s D. 0.044 s E. 0.022 s
A mass m is attached to a vertical spring with a force constant k, it oscillates with a period T. If the spring is cut to one third of its original length and the same mass is attached to it, the new period of oscillation will be
A) less than T. B) greater than T. C) equal to T. D) It could be greater or less than T, depending on how you cut the spring.
We can study how galaxies evolve because ________
A) galaxies are transparent to visible light B) we can watch as they interact in real time C) the farther away we look, the further back in time we see D) we are really smart astronomers
26Al decays by beta-plus decay. What is the daughter nucleus?
A. 27Al B. 25Al C. 26Mg D. 26Si E. 26Al