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
c. both hot and cold reservoir temperatures
b. cold reservoir temperature only
d. None of the above choices are valid.
C
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By how many newtons does the weight of a 100-kg person change when he goes from sea level to an altitude of 5000 m? (The mean radius of the Earth is 6.38 × 106 m.)
A) 0.6 N B) 1.6 N C) 2.6 N D) 3.6 N E) 5.2 N
The moment reaction at A in the plane frame below is approximately:
(A) 11400 N ## m
(B) 22280 N # m
(C) 23600 N # m
(D) 16400 N m
What is the impedance of an ac series circuit with 12.0 ? of resistance, 15.0 ? of inductive reactance, and 10.0 ? of capacitive reactance?
A) 21.9 ? B) 13.0 ? C) 11.6 ? D) 27.7 ?
An airplane travels at 141 km/h toward the northeast. What is its component of velocity due north?
A) 41 km/h B) 100 km/h C) 110 km/h D) 141 km/h