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) Hot gas is rising up from the solar interior.
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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°
You conduct the following three ball drops, in each case measuring the time it takes for the ball to fall to the ground; the mass is the mass of the ball and the height is the height from which you drop the ball:
Ball Drop 1. Mass 0.5 kilograms, height 20 meters Ball Drop 2. Mass 5.0 kilograms, height 20 meters Ball Drop 3. Mass 0.5 kilograms, height 30 meters Which pair of ball-drops will best test whether mass affects the acceleration of gravity? A) ball drops 2 and 3 B) ball drops 1 and 3 C) ball drops 1 and 2
The Greek model of the atom should be classified as
A) a useful theory. B) a useless falsehood. C) an experimental fact. D) a tentative hypothesis. E) an observation.
An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
a. 5.13 b. 5.56 c. 5.72 d. 5.93 e. 4.55