Find the change in entropy (in J/K) when 5.00 moles of an ideal gas undergo a free expansion from an initial volume of 20 cm3 to a final volume of 100 cm3
a. 71
b. 52
c. 67
d. 191
e. 208
C
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Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the
A) carpeted floor provides a smaller impulse. B) stopping time is shorter on the carpet. C) stopping time is longer on the carpet. D) carpet provides a smaller impulse and a longer time.
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The net force on the body
a. is zero. b. has its largest magnitude. c. points up. d. points down.
A block of mass m is projected across a horizontal surface with an initial speed v. It slides until it stops due to the friction force between the block and the surface. The surface is now tilted at 20° and the block is projected up the surface with the same initial speed, v. Assume that the friction force remains the same as when the block was sliding on the horizontal surface. When the block
comes to rest momentarily, how does its total mechanical energy compare to the case where the block slid horizontally comes to rest? 1.It is the same. 2.It is less in the case where the block went up the slope. 3.It is more in the case where the block went up the slope. 4.We cannot tell from the information given.
Which of the following is the smallest distance?
A) diameter of a typical planet B) 1 light-second C) 1 AU D) diameter of a typical star