A metal cylinder of radius 2.0 mm is concentric with another metal cylinder of radius 5.0 mm. If the space between the cylinders is filled with air and the length of the cylinders is 50 cm,
what is the capacitance of this arrangement? (k = 1/4??0 = 8.99 × 109 N • m2/C2)
A) 33 pF
B) 60 pF
C) 22 pF
D) 30 pF
E) 11 pF
D
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A planet of mass M orbits a star in a circular orbit of radius R, in orbital period T. What would be the orbital period of another planet, orbiting at radius R, but having mass 2M?
A. 0.71T B. T C. 1.4T D. 2T E. 0.50T
Two speakers in an automobile emit sound waves that are in phase at the speakers. One speaker is 40 cm ahead of and 30 cm to the left of the driver's left ear. The other speaker is 50 cm ahead of and 120 cm to the right of the driver's right ear. Which of the following wavelengths is(are) in phase at the left ear for the speaker on the left and the right ear for the speaker on the right?
A. 10 cm B. 20 cm C. 650 cm D. All of the wavelengths listed above. E. Only the wavelengths listed in (a) and (b).
A 10-V battery is connected to a 15-? resistor and an unknown resistor R, as shown. The current in the circuit is 0.40 A. How much heat is produced in the 15-? resistor in 2.0 min?
a.
0.40 kJ
b.
0.19 kJ
c.
0.29 kJ
d.
0.72 kJ
e.
0.80 kJ
Light of wavelength 400 nm bombards a surface with work function 2.46 eV. What is the maximum kinetic energy of the photoelectrons from this surface?
A. no photoelectrons are emitted B. 2.46 eV C. 3.30 eV D. 0.640 eV E. 0.840 eV