The maximum theoretical thermodynamic efficiency of a heat engine operating between hot and cold reservoirs is a function of which of the following?
a. hot reservoir temperature only
b. cold reservoir temperature only
c. both hot and cold reservoir temperatures
d. None of the above choices are valid.
c
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An electron has a velocity of 6.0 × 10^6 m/s in the positive x direction at a point where the magnetic field has the components Bx = 3.0 T, By = 1.5 T, and Bz = 2.0 T. What is the magnitude of the acceleration of the electron at this point?
a. 2.1 × 10^18 m/s2 b. 1.6 × 10^18 m/s2 c. 2.6 × 10^18 m/s2 d. 3.2 × 10^18 m/s2 e. 3.7 × 10^18 m/s2
Which of the following is an inherent disadvantage of radio telescopes?
A. Radio telescopes cannot detect visible light. B. They only work at night. C. Radio telescopes have low magnification. D. Radio signals are very weak, and their photons do not penetrate the atmosphere easily. E. The long wavelength of radio waves results in lower resolving power, compared to other telescopes of the same size.
Consider a 4500. ohm resistor in series with a 133. mH inductor. What capacitance should be added in series so that the impedance is a minimum at 500. KHz?
A) 2.67 ?F B) 0.627 pF C) 0.762 pF D) 7.26 ?F E) 0.267 pF
A 15.0-m rope is pulled taut with a tension of 140 N. It takes 0.545 s for a wave to propagate along the rope. What is the mass of the rope?
A) 1.67 kg B) 2.10 kg C) 2.77 kg D) 5.09 kg E) 3.19 kg