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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

Why must you be careful in how you start the timing when you measure the time increments for multiple oscillations of a vibrating system?

Physics & Space Science

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

Physics & Space Science