The energy emitted from the surface of a main sequence star is less than the energy generated in the core
a. True
b. False
Indicate whether the statement is true or false
False
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Frictional forces between a probe and a sample are measured with a variant of which microscope?
(a) An optical microscope (b) A SEM (c) A STM (d) An AFM
What makes direct imaging of exoplanets possible?
A. Exoplanets are very dim compared to their host star. B. Exoplanets emit their own light in visible wavelengths, where the host star is dimmer. C. Exoplanets reflect light directly toward their host star. D. Exoplanets emit their own light in the infrared, where the host star is dimmer. E. None of these choices are correct.
Which is the strongest fundamental force?
A) gravitational force. B) electric force. C) nuclear strong force. D) none of the above
A ball is dropped from somewhere above a window that is 2.00 m in height. As it falls, it is visible to a person looking through the window for 200 ms as it passes by the 2.00 m height of the window
From what height above the top of the window was the ball dropped? A) 8.32 m B) 1.87 m C) 4.15 m D) 4.76 m E) 6.78 m