Differential rotation of the Sun is
a. heating in the chromosphere and corona that makes them hotter than the photosphere.
b. the magnetic dynamo inside the Sun.
c. the equatorial regions of the Sun rotating more rapidly than the polar regions.
d. the origin (and subsequent disappearance of) Sunspots first near the poles then closer to the Sun's equator as the Sunspot cycle progresses.
e. the rotation of the Sun's southern and northern hemispheres in opposite directions.
c
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When a train makes a curve, a tapered wheel rim is able to
A) cover different distances per revolution. B) maintain a fixed rotational speed. C) reduce differences in angular speeds.
An organ pipe open at both ends is 1.5 m long. A second organ pipe that is closed at one end and open at the other is 0.75 m long. The speed of sound in the room is 330 m/s. Which of the following sets of frequencies consists of frequencies which can be produced by both pipes?
A. 110 Hz, 220 Hz, 330 Hz B. 220 Hz, 440 Hz, 660 Hz C. 110 Hz, 330 Hz, 550 Hz D. 330 Hz, 440 Hz, 550 Hz E. 220 Hz, 660 Hz, 1 100 Hz
Which of the following statements is true of the angles of incidence and reflection?
a. They are not related b. They can never be equal c. They are always equal d. They add to 90°.
Which of the numbers 0.1, 1.0, and 2.0 represent possible values for the COP of a heat pump?
1.0.1 only 2.1.0 only 3.2.0 only 4.all of these.