Suppose you are in an elevator that is traveling upward at constant speed. How does your weight compare to your normal weight on the ground?
A) It is the same.
B) It is greater.
C) It is less.
D) You are weightless.
A) It is the same.
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Phase Angles: The figure shows a series ac circuit. The inductor has a reactance of 60 ? and an inductance of 210 mH. A 30-? resistor and a capacitor whose reactance is 80 ? are also in the circuit, and the rms current in the circuit is 2.2 A. What is the phase angle of the circuit?
A. -34° B. 34° C. +90° D. -56° E. 56°
This photograph shows a small portion of the Sun's photosphere. What is going on in the bright regions (such as the bright region indicated by the arrow)?
A) Hot gas is rising up from the solar interior. B) Cool gas is falling back down into the solar interior. C) The bright spots are regions of unusually intense magnetic fields. D) The bright spots are what we call sunspots.
A mine railroad car, of mass 200 kg, rolls with negligible friction on a horizontal track with a speed of 10.0 m/s. A 70. kg stunt man drops straight down a distance of 4.0 m, and lands in the car
How fast will the car be moving after this happens?
A light bulb is connected to a 110-V source. What is the resistance of this bulb if it is a 100-W bulb?
A) 100 ? B) 8.0 m? C) 6.0 m? D) 120 ? E) 240 ?