The windings of a motor have a resistance of 4.0 ?. The counter emf of this motor when connected to a 120-V line and running at full speed is 104 V
(a) What is the start up current of this motor? (b) What is the current in the motor when running at full speed?
(a) 30 A
(b) 4 A
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While most neutron stars are also pulsars, an older "bare" neutron star was captured in rapid motion only 200 lightly years distant by:
A) Arecibo Radio Observatory. B) the Keck Telescopes used as an interferometer. C) the Chandra X-ray observatory. D) the Hubble Space Telescope. E) the Spitzer Infrared Space Telescope.
Which requires more energy?
A) melting a gram of 0°C ice B) increasing the temperature of 1 gram of water from 0°C to 100°C C) changing 1 gram of 100°C water to 100°C steam D) all the same
An electronic component with a 17-? resistor is rated for use at power levels not exceeding What is the safe current through the component?
A) 0.91 A B) 1.21 A C) 238 A D) 0.22 A
A parallel-plate capacitor is connected to a battery and becomes fully charged. The capacitor is then disconnected, and the separation between the plates is increased in such a way that no charge leaks off
As the plates are being separated, the energy stored in this capacitor A) increases. B) decreases. C) does not change. D) become zero.