A 10-mH inductor is connected in series with a 10-ohm resistor, a switch and a 6-volt battery. What is the time constant of the circuit? How long after the switch is closed will the current reach 99 percent of its final value?
What will be an ideal response?
1.0 ms, 4.6 ms
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If you are learning to juggle it would be good to slow the ball's acceleration. You can do this by using
A) lighter balls. B) heavier balls. C) more balls. D) none of the above
A 0.10-?F capacitor is connected to a 120-V rms 60-Hz source
(a) What is its capacitive reactance? (b) What is the rms current to the capacitor? (c) If both the capacitance and the frequency were doubled, what would be the rms current? What will be an ideal response?
An L-shaped metal machine part is made of two equal-length segments that are perpendicular to each other and carry a 4.50-A current as shown in the figure
This part has a total mass of 3.80 kg and a total length of 3.00 m, and it is in an external 1.20-T magnetic field that is oriented perpendicular to the plane of the part, as shown. What is the magnitude of the NET magnetic force that the field exerts on the part? A) 8.10 N B) 11.5 N C) 16.2 N D) 22.9 N E) 32.4 N
In an observation made in 1919 demonstrating the deflection of starlight due to gravity, light rays moving near ________ bent to a slightly different angle.
A. a laser with the same frequency of light B. the Earth at its equator C. the Sun D. the Moon