Three identical charges of 3.0 ?C are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts on any one of the charges?
A) 1.6 N
B) 1.8 N
C) 2.0 N
D) 2.2 N
E) 2.4 N
A
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The energy of a proton is 1.0 MeV below the top of a 6.8-fm-wide energy barrier
What is the probability that the proton will tunnel through the barrier? (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 0.051 B) 0.048 C) 0.056 D) 0.053
According to relativity theory, you can experience a longer youth when you
A) are near a black hole. B) are near a very large gravitational field. C) travel at nearly the speed of light. D) all of the above E) none of the above
The warmer brown dwarfs fall in spectral class _____
A) O B) A C) L D) T
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5 sin (?t + ?/3). The phase (in rad) of the motion at t = 2 s is
a. 7?/3. b. ?/3. c. ?. d. 5?/3. e. 2?.