If a transparency sheet is rubbed with tissue and the transparency and the tissue are then held at rest a short distance from each other, the force between them will be
A) a repulsive electric force.
B) a repulsive magnetic force.
C) an attractive electric force.
D) an attractive magnetic force.
E) zero.
C
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A 45-mH ideal inductor is connected in series with a 60-? resistor through an ideal 15-V DC power supply and an open switch. If the switch is closed at time t = 0 s, what is the current 7.0 ms later?
A) 250 mA B) 650 mA C) 550 mA D) 280 mA E) 850 mA
The small circles in the diagram below represent the positions along the x axis of a body at equal time intervals. Assume the body moves in a straight line
This diagram is most likely to describe
a.
a swimmer swimming laps.
b.
an exercise on a rowing machine.
c.
a person on a treadmill.
d.
a tennis ball during a volley.
e.
a runner who tripped, fell, rose, and continued racing.
Why must you be careful in how you start the timing when you measure the time increments for multiple oscillations of a vibrating system?
A star of apparent magnitude ________ appears 2.51 times brighter than a star of apparent magnitude 4.
A. 10 B. 3 C. 1 D. 6.51 E. 1.49