The most luminous stars in elliptical galaxies are:
A) B stars.
B) O stars.
C) blue supergiants.
D) red giants.
D
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The radius of the moon's orbit is about ____ times larger than the radius of Earth
a. 0.6 b. 6 c. 60 d. 600 e. 6000
The mean free path of molecules in a gas is proportional to:
A. the molecular diameter B. the reciprocal of the molecular diameter C. the molecular concentration D. the reciprocal of the molecular concentration E. the average molecular speed
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The waves with the largest wavelength are waves __________ and ___________.
A Boeing-737 airliner has a mass of 30,000 kg. The total area of the wings is 100 m2 . What must be the pressure difference between the top and bottom of the wings to keep the airplane up?
a. 1960 Pa c. 7840 Pa b. 2940 Pa d. 15,700 Pa