A 4.0-mF capacitor initially charged to 50 V and a 6.0-mF capacitor charged to 30 V are connected to each other with the positive plate of each connected to the negative plate of the other. What is the final charge on the 6.0-mF capacitor?
a. 20 mC
b. 8.0 mC
c. 10 mC
d. 12 mC
e. 230 mC
D
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Magnetic Moment: A flat circular coil has 250 identical loops of very thin wire. Each loop has an area of 0.12 m2 and carries 15 mA of current. This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What is the magnitude of the magnetic moment of the coil?
Fill in the blank(s) with the appropriate word(s).
Star A and star B have the same temperature, but different luminosities. What can you infer about these two stars?
A) Star A must be bigger. B) Star B must be bigger. C) Star A must be redder. D) Star B must be redder. E) Nothing can be inferred from the information given.
A gas-filled vertical cylinder, closed at the bottom end, is fitted at the top with a piston that can move freely
The mass of the piston is 10.0 kg, and the initial height of the piston above the bottom of the cylinder is 25 cm. A mass of 8.0 kg is placed on the piston. What is the resulting height of the piston, assuming that the temperature of the ideal gas is kept constant? A) 12 cm B) 13 cm C) 14 cm D) 15 cm E) 16 cm
With respect to the earth, object 1 is moving at speed 0.80 c to the right. Object 2 is moving in the same direction at speed 0.80 c with respect to object 1. How fast is object 2 moving with respect to the earth?
A) 0.64 c B) 0.98 c C) 0.16 c D) 1.6 c E) 0.80 c