In science, the tendency of an experiment to produce a particular result is referred to as
A) a deviation
B) bias
C) an error
D) an uncertainty
B
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Choose the correct word(s) that make the statement true. Say you live in the southern hemisphere and the date is March 20 . For you, summer is ending. Therefore, the March 20th date is the first day of (spring, summer, fall, winter), an event called the (vernal equinox, summer solstice, autumnal equinox, winter solstice)
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Over time, the star-gas-star cycle leads the gas in the Milky Way to ________
A) become denser and hotter B) have a greater abundance of heavy elements C) have a lower abundance of heavy elements D) become denser and have a greater abundance of heavy elements
In a chiller unit R-123 evaporates at -20ºC in 1-cm-inside-diameter horizontal tubes. The inside surface temperature of the tubes is estimated as 5ºC and film boiling is assumed. Saturated liquid flows in at 20 g/s and is to leave as saturated vapor. Estimate the necessary tube length required. Use hnf = 183.4 kJ/kg and hng = 367.9 kJ/kg for R-123.
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The Great Nebula in Orion, M-42, is a low-density cloud of hot gas. Use Kirchhoff's laws to describe its spectrum
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