Which of the following is NOT a planet visible to the naked eye?
A) Saturn
B) Neptune
C) Mercury
D) Jupiter
B
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The lower edge of the Main Sequence band is known as ____ and represents the location in the HR-diagram at which stars begin their lives as main sequence stars
a. the Coulomb barrier b. hydrostatic equilibrium c. the birth line d. the zero-age main sequence e. the evolutionary track
A large ice cube is 30 cm on each side. If the length of each side is increased by a factor of three, the volume
A. increases by a factor of 1/9. B. increases by a factor of 6. C. increases by a factor of 9. D. increases by a factor of 27.
Dmitri places one end of a copper rod in a heat reservoir and the other end in a heat sink. By what factor is the rate of heat flow changed when the temperature difference between the reservoir and sink is tripled?
a. 0.33 b. 1/9 c. 3.0 d. 9.0
Light spreads out when it passes through a narrow slit because of interference
a. True b. False Indicate whether the statement is true or false