The work done on an ideal gas system in an isothermal process is -400 J. What is the change in internal (thermal) energy of the gas?
A) 0 J
B) -400 J
C) 400 J
D) 200 J
A
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A series RLC ac circuit has a capacitive reactance of 55
and inductive reactance of 25
and a resistance of 40
What is the impedance of this circuit?
A. 12
B. 95
C. 70
D. 10
E. 50
Imagine that you could magically move the moon closer to Earth, so that the distance from Earth to moon is cut in half. This would cause the force that Earth exerts on the moon to be
A) reduced to 1/4 of its original value. B) doubled. C) increased to four times its original value. D) halved. E) Nonsense--Earth exerts no force on the moon.
A 150-W lamp is placed into a 120-V ac outlet. What is the peak current?
A) 0.80 A B) 0.88 A C) 1.2 A D) 1.8 A
The combined mass of a binary system is three solar masses. Star A is 1 AU and Star B is 2 AU from the center of mass. What are the masses of Star A and Star B, respectively?
a. 2.5, 0.5 b. 1, 2 c. 2, 1 d. 0.5, 2.5