An ac signal is applied across a 40-mH inductor and a 100-? resistor. If the power factor of this circuit is 0.40, what is the frequency of the ac signal?
A) 160 Hz B) 910 Hz C) 410 Hz D) 600 Hz E) 200 Hz
B
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An airplane with an airspeed of 120 km/h has a heading of 30° east of north in a wind that is blowing toward the west at 30 km/h. What is the speed of the plane relative to the ground?
A) 150 km/h B) 90 km/h C) 140 km/h D) 110 km/h
A solid cylindrical bar conducts thermal energy at a rate of 25 W from a hot to a cold reservoir under steady state conditions
If both the length and the diameter of this bar are doubled, the rate at which it will conduct thermal energy between these reservoirs will be A) 200 W B) 100 W C) 50 W D) 25 W E) 12.5 W
Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10^?4 T. How much energy is stored in 1.0 m3 of the atmosphere because of this field?