The helium flash shows up on the H-R diagram on the way to the horizontal branch
Indicate whether the statement is true or false
TRUE
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The mean free path of a molecule is 
m in an ideal gas at standard temperature and pressure. What is the mean free path when the pressure of the gas is doubled and the temperature is tripled?
a. 
b. 
c. 
d. 
e. 
According to Copernicus, the retrograde motion for Mars must occur
A) at inferior conjunction, when Mars laps the Earth and passes between us and the Sun. B) at superior conjunction, when Mars lies on the far side of the Sun. C) at quadrature, when Mars lies exactly 90 degrees east or west of the Sun. D) at greatest elongation, when Mars can get up to 47 degrees from the Sun. E) at opposition, when the Earth overtakes Mars and passes between Mars and the Sun.
A container with a one-liter capacity at 27°C is filled with helium to a pressure of 2.0 atm. (1 atm = 1.0 × 105 N/m2.) How many moles of helium does it hold?
A. 0.041 B. 0.081 C. 0.45 D. 0.90 E. 1.0
A helicopter descends from a height of 600 m with uniform negative acceleration, reaching the ground at rest in 5.00 minutes. Determine the acceleration of the helicopter and its initial velocity