The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.00-m string is 308 N, and one-half wavelength occupies the string, what is the mass of the wire?
a. 0.025 kg
b. 0.049 kg
c. 0.051 kg
d. 0.081 kg
e. 0.037 kg
C
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As the Sun evolves into a red giant in the distant future, then according to Wien's Law:
A) most of its energy must become shorter in wavelength. B) its peak on the Planck curve will move into the infrared. C) its total luminosity must decrease. D) it will disappear from the universe of visible light. E) its light will be slowed down by its increasing mass.
A thin uniform rod (length = 1.2 m, mass = 2.0 kg) is pivoted about a horizontal, frictionless pin through one end of the rod. (The rotational inertia of the rod about this axis is ML2/3.) The rod is released when it makes an angle of 37° with the horizontal. What is the angular acceleration of the rod at the instant it is released?
a. 9.8 rad/s2 b. 7.4 rad/s2 c. 8.4 rad/s2 d. 5.9 rad/s2 e. 6.5 rad/s2
A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates
A slab of a dielectric material is inserted in the region between the plates and completely fills it. What changes would you observe as the dielectric is inserted? (There could be more than one correct choice.) A) Both the charge on the plates of the capacitor and its capacitance would change. B) The potential difference across the plates would increase. C) Only the charge on the plates of the capacitor would change. D) Nothing would change. E) Only the capacitance would change.
Oil flows through the Alaska pipe line on a clear, sunny day. The flow in the pipe can best be classified as:
(A) Uniform (B) Developed (C) Two-dimensional (D) Cylindrical