Betelgeuse is the bright red star representing the left shoulder of the constellation Orion. All the following statements about Betelgeuse are true. Which one can you infer from its red color?
A) It is much brighter than the Sun.
B) Its surface is cooler than the surface of the Sun.
C) It is much more massive than the Sun.
D) It is moving away from us.
B
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A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.0 
then the tangential acceleration of a point 3.0 cm from the center of the CD after 3.0 sec is
A. 0.40 
B. 0.25
C. 0.10
D. 0.06
E. 0.03
The point in Earth's orbit where Earth is farthest from the Sun is known as perihelion. precession. the winter solstice. aphelion. a and d.
a. aphelion.
b. perihelion.
c. precession.
d. the winter solstice
e. a and d
A fountain sends a stream of water 20.0 m up into the air. If the base of the stream is 10.0 cm in diameter, what power is required to send the water to this height?
What will be an ideal response?
Suppose that you were selected for a "Survivor"-type TV show. To help keep your group connected, you suggest that long vines can be tied together and used to transmit signals in cases of emergency. To get the signals to travel faster, you should
a. select lighter vines. b. increase the tension on the vines. c. hang weights from the vines at evenly spaced intervals. d. do all of the above. e. do (a) or (b) above, preferably both.