A gasoline engine absorbs 2 500 J of heat at 250°C and expels 2 000 J at a temperature of 50°C. The magnitude of the change in entropy (in J/K) for the system is
a. 6.2
b. 4.7
c. 1.4
d. 10.9
e. 3.2
C
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The Cretaceous is a(n)
a. epoch. b. era. c. eon. d. period.
The rotating systems shown in the figure differ only in that the two identical movable masses are positioned a distance r from the axis of rotation (left), or a distance r/2 from the axis of rotation (right)
You release the hanging blocks simultaneously from rest, and call tL the time taken by the block on the left and tR the time taken by the block on the right to reach the bottom, respectively. The bar, pulley, and rope have negligible mass, the rope does not slip, and there is no friction in the axle of the pulley. Under these conditions A) tL = tR. B) tL = tR. C) tL = tR. D) tL = 2tR. E) tl = 4tR.
The energy in the Sun's core is produced by
A. the chemical reaction of hydrogen and helium. B. the release of gravitational potential energy. C. the fusion of hydrogen to helium. D. radioactive decay.
Refraction results from changes in light's
A) frequency. B) incident angles. C) speed. D) all of the above E) none of the above