Water flows through pipe A into pipe B. Pipe B is larger and has three times the cross-sectional area that pipe A has. Compared to the speed of the water in pipe A, the speed in pipe B is:
A. 1/3
B. 1/2
C. the same
D. 3X
E. 9X
A. 1/3
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If the mass of the earth and all objects on it were suddenly doubled, but the size remained the same, the acceleration due to gravity at the surface would become
A) 4 times what it now is. B) 1/4 of what it now is. C) 2 times what it now is. D) the same as it now is. E) 1/2 of what it now is.
Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question?
A) What would it be like to ride on a beam of light? B) How many stars are in the universe? C) Can we measure the position and momentum of an electron at the same time? D) Why is the sky dark at night?
Any compact object with a mass greater than _______________ solar masses must form a black hole
Fill in the blank(s) with correct word
Dust particles are pulverized rock, which has density 2500 kg/m3. They are approximately spheres 20 ?m in diameter
Treating dust as an ideal gas, what is the root-mean-square speed (thermal speed) of a dust particle at (The Boltzmann constant is 1.38 × 10-23 J/K.) A) 5.2 × 10-5 m/s B) 1.7 × 10-5 m/s C) 3.0 × 10-5 m/s D) 7.3 × 10-5 m/s