Rank the electric potentials at the four points shown in Figure OQ25.7 from largest to smallest
4
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Angular Momentum: A solid, uniform, horizontal disk with a diameter of 2.0 m and a mass of 4.0 kg freely rotates at 36 rpm about a vertical axis through its center. A small 0.50-kg stone is suddenly dropped onto the disk and sticks to the disk at a distance of 80 cm from the axis of rotation. The figure shows before and after views.(a) Before the stone fell, what was the moment of inertia of the disk about its central axis?(b) After the stone stuck, what was the moment of inertia of the system about the same axis?(c) What is the angular velocity of the disk (in rpm) after the stone fell onto the disk?
What will be an ideal response?
Irr II galaxies may be the result of a collision, or close encounter, of two normal galaxies
Indicate whether the statement is true or false
A heat pump has a coefficient of performance of 4 . If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is
a. 34 b. 25 c. 36 d. 40 e. 80
Nuclear Binding Energy: The stability of 
C with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:
A. not subject to alpha, beta-plus or beta-minus decay. B. subject to alpha decay only. C. subject to beta-plus decay only. D. subject to beta-minus decay only. E. subject to beta-plus or beta-minus decay, but not to alpha decay.