It is impossible to construct an engine that is more than 100% efficient. The physical law covering this case is
A. Kelvin's statement of the second law of thermodynamics.
B. the third law of thermodynamics.
C. the zeroth law of thermodynamics.
D. the first law of thermodynamics.
E. Clausius's statement of the second law of thermodynamics.
Answer: D
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What causes the long tail to protrude from this galaxy?
A: A supernova explosion blew material out in that direction. B: The galaxy is moving so fast through space that it's leaving a trail of heavier matter behind. C: A unique and yet unexplained phenomenon creates an anti-gravity effect that's pushing stars out of the galaxy. D: Tidal forces caused by interaction with another galaxy are drawing the material off. E: An incredibly powerful extraterrestrial civilization is reshaping the galaxy to suit its tastes.
A charge (uniform linear density = 9.0 nC/m) is distributed along the x axis from x = 0 to x = 3.0 m. Determine the magnitude of the electric field at a point on the x axis with x = 4.0 m
a. 81 N/C b. 74 N/C c. 61 N/C d. 88 N/C e. 20 N/C
The magnetic force on a point charge in a given magnetic field and at a given speed is largest when it
A. has velocity components both parallel to and perpendicular to the field. B. moves perpendicular to the magnetic field. C. moves in the direction opposite to the magnetic field. D. moves in the direction of the magnetic field.
According to the second law of thermodynamics, for any process that may occur within an isolated system, which answer applies?
A. entropy remains constant. B. entropy increases. C. entropy decreases. D. depends on the rate of change of the process.