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.
D
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Can the lines in the figure below be equipotential lines?
a.
No, because there are sharp corners.
b.
No, because they are isolated lines.
c.
Yes, because any lines within a charge distribution are equipotential lines.
d.
Yes, they might be boundary lines of the two surfaces of a conductor.
e.
It is not possible to say without further information.
Which of the following seismic waves travels the slowest?
a. surface waves c. shear waves b. pressure waves d. both surface and pressure waves
A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of and it bounces back with this same speed
The ball is in contact with the wall What is the magnitude of the average force exerted on the wall by the ball? A) 800 N B) 400 N C) 55,000 N D) 27,500 N E) 13,750 N
A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2 . What area must be removed form the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10^?6 (°C)?1.)
a. 0.079 3 cm2 b. 0.159 cm2 c. 0.238 cm2 d. 0.841 cm2 e. 0.921 cm2