The reason that we can calculate the change in entropy of a system is that
A. entropy always decreases.
B. entropy always increases.
C. the entropy of the universe always remains constant.
D. it depends only on the properties of the initial and final equilibrium states.
E. systems always follow reversible paths.
Answer: D
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Equilibrium: As shown in the figure, a 10.0 m long bar is attached by a frictionless hinge to a wall and held horizontal by a light rope that makes an angle ? = 49° with the bar. The bar is uniform and weighs 66.5 N. What distance x from the hinge should a 10.0 kg mass be suspended for the tension in the rope to be 177 N?
Fill in the blank(s) with the appropriate word(s).
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2 . What is the magnitude of the electric field at any point not on either surface?
a. 1.1 N/C b. 5.6 N/C c. 7.9 N/C d. 3.8 N/C e. 4.0 N/C
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The linear momentum of the crate is __________
Fill in the blank(s) with correct word
A car and driver have a total mass of 945 kg. While rounding a curve on a flat road at a speed of 29 m/s, the net force acting on the car and driver is determined to be 56,767.5 N. The radius of the curve is__________
Fill in the blank(s) with correct word