As more resistors are added in parallel across a constant voltage source, the power supplied by the source
A) increases.
B) decreases.
C) does not change.
A
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Detect a star giving off more ultraviolet light than green light. What property of thestar can I estimate with this information?
a) Its chemical composition b) Its temperature c) Its density d) Its age e) Its distance from Earth
If the ac peak current through a 100 ohm resistor is 1.7 A, the peak voltage across this resistor is
A) 289 V. B) 110 V. C) 170 V. D) 210 V. E) 120 V.
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
When a sound wave moves through a medium such as air, the motion of the molecules of the medium is in what direction (with respect to the motion of the sound wave)?
a. perpendicular c. anti-parallel (in opposite direction) b. parallel d. Both choices B and C are valid.