A transverse periodic wave is represented by the equation y(x, t) = 2.50 cm cos(2,500 rad/s t - 15.0
x). What is the k vector of the wave?
A. 15.0 
in the - x direction
B. 15.0 in the + x direction
C. 30.0 in the + y direction
D. 30.0 in the - y direction
E. 45.0
in the + x direction
B. 15.0 in the + x direction
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Faraday's Law: As shown in the figure, a wire and a 10-? resistor are used to form a circuit in the shape of a square with dimensions 20 cm by 20 cm. A uniform but non-steady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is steadily decreased from 2.70 T to 0.90 T in a time interval of 96 ms. What is the induced current in the circuit, and what is its direction through the resistor?
A. 75 mA, from b to a B. 45 mA, from b to a C. 75 mA, from a to b D. 45 mA, from a to b E. 110 mA, from a to b
The notation used to represent an antiparticle is
a. the particle symbol with a bar over it. b. e+, in the case of the positron. c. ?+, in the case of the antimuon. d. all of the above.
A 110-V hair dryer is rated at 1200 W. What current will it draw when operating from a 110-V electrical outlet?
A) 90 mA B) 1.0 A C) 5.0 A D) 11 A E) 14 A
Decreasing the focal length of the eyepiece in a compound microscope by 50% changes the magnification to _______ times the previous magnification.
A. 0.50 B. 1.5 C. 1.7 D. 2.0 E. 4.0