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

Physics & Space Science

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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.

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Physics & Space Science

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

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Physics & Space Science

When de Broglie's matter waves are applied to electrons in the Bohr atom, which of the following occurs?

A. The electron is found to have in its orbit an integral number of half-wavelengths. B. Bohr's quantization assumption for electron orbits is modified to incorporate the wave properties of the electron. C. de Broglie's results allow an integral number of wavelengths in the electron orbits. D. The angular momentum of the electron in the atom is constant, with longer wavelengths at larger quantum numbers.

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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

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Physics & Space Science