Which of the following hypothetical observations would contradict current understanding of the nature of white dwarfs?
A) discovery of a white dwarf with a mass of 1.5 MSun
B) discovery of a white dwarf with a surface temperature of 6000 K
C) discovery of a white dwarf at the center of a planetary nebula
D) discovery of a white dwarf with a 1.5 MSun mass main-sequence companion
A) discovery of a white dwarf with a mass of 1.5 MSun
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Which font in the figure above is an example of a monospace font?
A. Tahoma B. Georgia C. Ravie D. Courier New
According to modern science, approximately how old is the Sun?
A) 4 1/2 billion years B) 25 million years C) 10,000 years D) 400 million years
Proper time interval is the
A. time kept by the observatory in Greenwich, England B. time measured by any observer with a calibrated clock C. elapsed time between two events measured in a frame of reference in which the two events occur at the same time D. elapsed time between two events measured in a frame of reference in which the two events occur at the same point in space
The cutting cord on a gas-powered weed cutter is 0.20 m in length. If the motor rotates at the rate of 20 rev/s, what is the tangential speed of the end of the cord?
a. 628 m/s c. 19 m/s b. 25 m/s d. 63 m/s