The emf produced by an ac generator is given by 
NBA sin 
t. In the SI system, what is the value of 
for a frequency of 60.0 Hz?
A. 60.0 Hz
B. 120 rad/s
C. 2.00
rad/s
D. 377 rad/s
E. 377 Hz
D. 377 rad/s
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What is unusual about the planet Venus?
A) It rotates in a direction opposite to the direction of its orbit. B) It orbits the Sun faster than it should give the size of its orbit. C) It orbits the Sun in a direction opposite that of all the other planets. D) It does not orbit the Sun in the same plane as the other planets. E) It rotates extremely rapidly around its axis.
The Milky Way galaxy has collided with several other large galaxies in its lifetime
a. True b. False Indicate whether the statement is true or false
Resistance and Resistivity: The resistivity of a 1.0 m long copper wire is 1.72 × 10-8 ? ? m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?
A. 17 mV B. 0.90 mV C. 1.7 mV D. 10 mV E. 90 mV
A rectangular beam with semicircular notches has dimensions h 5 160 mm and h1 5 140 mm. The maximum allowable bending stress in the plastic beam is ?max 5 6.5 MPa, and the bending moment is M 5 185 N?m. The minimum permissible width of the beam is:
(A) 12 mm
(B) 20 mm
(C) 28 mm
(D) 32 mm
