What is the mean free path of a gas of hard spheres of radius 2.00 × 10-9 m when the number of spheres per volume is 3.00 × 1019 m-3?
A)
1.17 × 10-4 m
B)
4.00 × 10-9 m
C)
9.76 × 10-5 m
D)
1.88 × 10-3 m
E)
4.69 × 10-4 m
E
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A film of index of refraction n1 coats a surface with index of refraction n2. When n1
A.
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.A 0.30-kg rock is swung in a circular path and in a vertical plane on a 0.25-m-length string. At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that point?
a. 7.9 N b. 16 N c. 18 N d. 83 N
Mass on a Spring: An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its elastic potential energy is a maximum?
A. at either A or B B. midway between A and B C. one-third of the way between A and B D. one-fourth of the way between A and B E. at none of these points
The above reactions are of the ___________________
a. proton-proton fusion chain
b. hydrogen-hydrogen fusion chain
c. CNO cycle
d. All of the other choices are correct.