Stars that have ejected a planetary nebula eventually become
a. protostars.
b. brown dwarfs.
c. white dwarfs.
d. red giants.
C
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Magnetic Field of a Long Wire: A long straight wire has a constant current flowing to the right. A rectangular metal loop is situated above the wire, and also has a constant current flowing through it, as shown in the figure. Which one of the following statements is true? 
A. The net magnetic force on the rectangle is upward, and there is also a nonzero torque on the rectangle. B. The net magnetic force on the rectangle is zero, and the net torque on it is zero. C. The net magnetic force on the rectangle is downward, and there is also a nonzero torque on the rectangle. D. The net magnetic force on the rectangle is zero, but there is a nonzero torque on the rectangle. E. The net magnetic force on the rectangle is downward, and the net torque on it is zero.
Recalling that iron lies at the lowest point of the "nuclear energy curve," which of the following nuclear reactions would "release" [that is, convert to other forms] nuclear energy from iron?
A) Fusion B) Fission C) Both of the above. D) None of the above. E) This is the wrong answer.
An object can move even when no force acts on it
1.True 2.False
You can increase the temperature of a gas by compressing it
Indicate whether the statement is true or false