An open circuit consists of a 12-?F parallel plate capacitor charged to 200 V and a 10-? resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is
a. 1.2 ?A.
b. 2.4 × 10^?4 A.
c. 2.4 mA.
d. 10 A.
e. 20 A.
e
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Energy Conservation With Nonconservative Forces: As shown in the figure, a 1.45-kg block is held in place against the spring by a 21-N horizontal external force. The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s as it separates from the spring. The block descends a ramp and has a velocity v2 = 2.1 m/s at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction between the block and the rough surface is 0.29. The velocity of the block is v3 = 1.4 m/s at C. The block moves on to D, where it stops. How much work is done by friction between points B and C?
style="vertical-align: 0.0px;" height="148" width="576" /> A. -1.8 J B. -3.6 J C. -14 J D. -6.4 J E. -7.0 J
In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? (
is the velocity of the light wave.)
A.
.B.
C.
D.
E.
An LED emits light of wavelength 600 nm. What is its band gap?
a. 1.11 eV b. 1.54 eV c. 1.99 eV d. 2.07 eV e. 2.33 eV
Two people sit face to face on nice skateboards that are free to roll without friction. They push each other with a force of 40 N and move apart. Person X, whose mass (including the skateboard) is 50 kg, moves to the left at 3 m/s. Person Z, whose mass (including the skateboard) is 60 kg,
A. moves to the right at 1 m/s. B. moves to the right at 10 m/s. C. moves to the right at 2.5 m/s. D. moves to the right at 4 m/s.