A 25. meter long wire, of diameter 0.30 mm, connected to 3.00 volts draws 0.499 A
(a) What is the resistance of the wire?
(b) What is its resistivity?
(c) What is its conductivity?
(a) 6.01 ?
(b) 1.70 × 10-8 ? ? m
(c) 5.88 × 107 ?-1m-1
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A 100-? resistor is connected in series with a 10.0-mH inductor across an ac source operating at 1.00 kHz. What is the impedance of this circuit?
A) 100 ? B) 200 ? C) 1000 ? D) 236 ? E) 118 ?
Is the acceleration due to gravity always pointing vertically downward even for an object whose velocity is vertically upward? Explain your answer
If the velocity of an object is zero at one instant, what is true about the acceleration of that object? (There could be more than one correct choice.)
A) The acceleration could be positive. B) The acceleration could be negative. C) The acceleration could be zero. D) The acceleration must be zero.
The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
a.
its speed is decreasing.
b.
its angular momentum is increasing.
c.
the gravitational force does no work on the planet.
d.
all of the above are correct.
e.
none of the above is correct.