A balloon of negligible mass is filled with 300 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.18 kg/m3.)
a. 150 kg
c. 333 kg
b. 300 kg
d. 444 kg
C
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Which of the following hypothetical observations would demonstrate that the inflation model was incorrect?
A) The geometry of the universe is curved, not flat. B) The helium abundance in a galaxy is 29%. C) The rate of expansion of the universe has changed over time. D) Stars began to shine only a few hundred million years after the Big Bang.
A force on an object is given by F(x) = ( -4.00 N/m)x + ( 2.00 N/m3)x3. What is the change in potential energy in moving from x = 1.00 m to x = 2.00 m?
A) 10.0 J B) -1.50 J C) -10.0 J D) 1.50 J E) 12.0 J
If Nellie hangs from a horizontal bar that is supported by four vertical ropes, the tension in the ropes
A) are each half her weight. B) are each equal to her weight. C) add to equal her weight. D) none of the above
Neutral hydrogen may be detected between the stars because it emits ________
Fill in the blank(s) with correct word