This photo shows an undersea volcanic vent. What is it, and what is its significance to the study of the origin of life?
A) Genetic studies suggest that life may have originated around vents like this one.
B) It is the place where we have found the oldest living organisms on Earth.
C) It is the place where we have found the oldest fossils on Earth.
D) It shows that fires can burn underwater.
A) Genetic studies suggest that life may have originated around vents like this one.
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A molecule in an ideal gas has an rms velocity 450 m/s. If the mean free path of the particle in the gas is 
then what is the average time between collisions?
a. 
b. 
c. 
d. 
e. 
Calculations show that gravity begins to overcome thermal pressure in clouds that are
A) less massive than the Sun. B) more massive than the Sun. C) more massive than ten times the Sun. D) more massive than a hundred times the Sun. E) more massive than a thousand times the Sun.
Water flows over a waterfall 20. m high, at the rate of 4.0 × 104 kg/s. If this water powers an electric generator with a 40% efficiency, how many watts of electric power can be supplied?
What will be an ideal response?
An LRC circuit is at critical damping with R = 100 ?. Starting from its maximum value, the charge on the capacitor drops to 50% of its value in a time t = 5 ms. What are the values of the inductance L and the capacitance C?
A) L = 0.36 H, C = 0.144 mF B) L = 2.67 H, C = 1. 25 mF C) L = 0.03 H, C = 0. 3 mF D) L = 1.17 H, C = 8.1 mF E) L = 5.12 H, C = 0. 06 mF