A transverse periodic wave is represented by the equation y(x, t) = A1 sin
Another transverse wave is represented by the equation y(x, t) = A2 sin
What is the equation that represents the superposition of the two waves?
A. y(x, t) = (A1+A2) sin
cos(kx) + (+A1+A2) cos
sin(kx)
B. y(x, t) = (A1+A2) sin
cos(kx) + (-A1-A2) cos
sin(kx)
C. y(x, t) = (A1-A2) sin
cos(kx) + (-A1+A2) cos
sin(kx)
D. y(x, t) = (A1+A2) sin
cos(kx) + (-A1+A2) cos
sin(kx)
D. y(x, t) = (A1+A2) sincos(kx) + (-A1+A2) cossin(kx)
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Kepler's Third, or harmonic, law states that the
A. semi-major axis of an orbit is inversely proportional to the period. B. planets move fastest when they are closest to the Sun. C. period of an orbit cubed equals the semi-major axis squared. D. semi-major axis of an orbit cubed equals the period squared.
Two charges of 15 pC and ?40 pC are inside a cube with sides that are of 0.40-m length. Determine the net electric flux through the surface of the cube
a. +2.8 N / m2/C b. ?1.1 N / m2/C c. +1.1 N / m2/C d. ?2.8 N / m2/C e. ?0.47 N / m2/C
There is no current in the circuit shown in the figure below until the switch is closed. The current through the 20-? resistor the instant after the switch is closed is either [1] 15 A or [2] 5.0 A, and the current through the 20-? resistor after the switch has been closed a long time is either [3] 5.0 A or [4] 15 A. Which combination of the above choices is correct?
a.
[1] and [3]
b.
[1] and [4]
c.
[2] and [3]
d.
[2] and [4]
e.
None of these
Force on a Wire: A straight 1.0-m long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.60 N, what is the current in the wire?
A. 2.0 A B. 1.0 A C. 3.0 A D. 4.0 A E. 5.0 A