Centrifuge separation, a method of separating 235U from 238U, works because of
A) the difference in size of the two nuclei.
B) the fact that both these nuclei are radioactive.
C) the difference in the masses of the two nuclei.
D) the difference in electrical charge of the two nuclei.
E) the fact that both these nuclei respond to (or feel) the strong nuclear force.
C
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The angular diameters of the Moon and Sun vary slightly because the orbits of the Moon and Earth are slightly elliptical
a. True b. False Indicate whether the statement is true or false
Thermal Expansion: Suppose that a rigid aluminum wire were to be strung out in a loop that just fits snugly around the equator (assuming a perfectly spherical Earth with a radius of 6.37 × 106 m). If the temperature of the wire is increased by 0.50°C, and the increase in length is distributed equally over the entire length, how far off the ground will the wire loop be if it remained centered on the earth? The coefficient of linear expansion of aluminum is 24 × 10-6 K-1.
A. 7.6 mm B. 76 mm C. 76 cm D. 76 m E. 760 m
In circular aperture diffraction, how does the diameter of the hole affect the diffraction pattern?
A. The smaller the hole the narrower the central maximum. B. The smaller the hole the wider the central maximum. C. The smaller the hole the smaller the angle to the first dark fringe. D. The hole diameter does not affect the pattern.
A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force on the car due to the road?
A) tangent to the curve in the forward direction B) tangent to the curve opposite to the direction of the car's motion C) perpendicular to the curve outward D) perpendicular to the curve inward E) There is no friction on the car because its speed is constant.