In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle?
a. zero
b. 45°
c. 90°
d. 180°
a
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A wave's velocity is the product of the:
A) frequency times the period of the wave. B) period times the energy of the wave. C) amplitude times the frequency of the wave. D) frequency times the wavelength of the wave. E) amplitude times the wavelength of the wave.
A simple pendulum, 2.6 m in length, is released with a push when the support string is at an angle of 45.0° from the vertical. If the initial speed of the suspended mass is 1.25 m/s when at the release point, what is its speed at the bottom of the swing? (g = 9.8 m/s2)
a. 4.1 m/s b. 3.9 m/s c. 4.1 m/s d. 16 m/s e. 7.2 m/s
A circular ring of charge with radius b has total charge q uniformly distributed around it. What is the magnitude of the electric field at the center of the ring?
1. 0 2. keq/b2 3. keq2/b2 4. keq2/b 5. none of those answers
When de Broglie's matter waves are applied to electrons in the Bohr atom, which of the following occurs?