The wiring in a motor has resistance of 1.2 ? and produces a back emf of 0.62 V when connected to a 10.3-V battery of negligible resistance. Find the current flow through the motor
a. 9.1 A
b. 8.6 A
c. 0.52 A
d. 8.1 A
e. 8.0 A
d
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Two equal mass objects (which are in thermal contact) make up a system that is thermally isolated from its surroundings. One object has an initial temperature of 100°C and the other has an initial temperature of 0°C
What is the equilibrium temperature of the system, assuming that no phase changes take place for either object? (The hot object has a specific heat capacity that is three times that of the cold object.) A) 23°C B) 19°C C) 75°C D) 50°C E) 25°C
American power plants usually supply 120 V ac
(a) At what frequency is this voltage supplied? (b) What is the maximum voltage?
What is the frequency of monochromatic light where the photon energy is 6.5 × 10^-19 J? (h = 6.63 × 10^-34 J×s)
a. 2.2 × 10^14 Hz c. 4.4 × 10^14 Hz b. 9.8 × 10^14 Hz d. 8.3 × 10^14 Hz
Satellite Motion: If Earth had twice its present mass but it orbited at the same distance from the sun as it does now, its orbital period would be
A. 4 years. B. 3 years. C. 2 years. D. 1 year. E. 6 months.