An AC voltage source, with a peak output of 122 V, is connected to a 54.0-? resistor. What is the rate of energy dissipated due to heat in the resistor?
a. 276 W
b. 138 W
c. 68.9 W
d. 195 W
e. 87.7 W
b
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If a person is nearsighted the corrective lens will:
a. take an object at the far point and form an image at 25 cm. b. take an object at 25 cm and form an image at the far point. c. take an object at infinity and form an image at the far point. d. take an object at infinity and form an image at 25 cm.
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 12 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the same direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 1.1 mT b. 1.4 mT c. 1.7 mT d. 2.0 mT e. 0.2 mT
The position x, in meters, of an object is given by the equation x = A + Bt + Ct2, where t represents time in seconds. What are the SI units of A, B, and C?
A) m, m, m B) m, s, s C) m, s, s2 D) m, m/s, m/s2 E) m/s, m/s2, m/s3
Current evidence suggests that life on Earth
A) originated in shallow ponds on land B) was delivered from elsewhere in meteorites C) was deliberately planted by an advanced civilization D) originated close to deep-sea volcanic vents or underground