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.
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.
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