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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A conducting rectangular loop of mass M, resistance R, and dimensions a × b is allowed to fall from rest through a uniform magnetic field which is perpendicular to the plane of the loop. The loop accelerates until it reaches a terminal speed (before the upper end enters the magnetic field). If a = 2.0 m, B = 6.0 T, R = 40 ?, and
M = 0.60 kg, what is the terminal speed?
a.
1.6 m/s
b.
20 m/s
c.
2.2 m/s
d.
26 m/s
e.
5.3 m/s
Applications to Astronomy: Pulsars are rapidly spinning
A. regular stars like our sun. B. red giant stars. C. neutron stars. D. white dwarfs.
Loop B?
A. Clockwise. B. Counterclockwise. C. No current flows in this loop. D. One needs more information to answer.
The atomic nuclei of the same element always have the same number of protons
Indicate whether the statement is true or false