Higher mass protostars enter the main sequence:
A) faster and at a higher luminosity and temperature.
B) faster and at a lower luminosity and temperature.
C) slower and at a higher luminosity and temperature.
D) slower and at a lower luminosity and temperature.
E) at the same rate, but at a higher luminosity and temperature.
A
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_______________ is a network of canyons 4000km long and up to 600km wide on the surface of Mars
Fill in the blank(s) with correct word
More than 96% of the mass of living cells are made of
A) carbon and hydrogen B) carbon C) carbon, hydrogen, oxygen, and nitrogen D) hydrogen and oxygen
Based on our current understanding of physics, we can understand the conditions that prevailed in the early universe as far back in time as about
A) 380,000 years after the Big Bang. B) one ten-billionth of a second after the Big Bang. C) 10-45 seconds after the Big Bang. D) 10 billion years ago.
A pure substance A having density of 800 kg/m^3 (56 lbm/ft^3) is diffusing into a binary mixture of A and B. If the velocity of A is 4 cm/hr (1.2 in/hr) into the mixture and the velocity of B is 3.6 cm/hr out of the mixture, what is the total bulk velocity? Assume that the density of pure B is 900 kg/m3 (63 lbm/ft^3) and that the mixture density is 890 kg/m^3 (61 lbm/ft^3).
What will be an ideal response?