In Figure 6-1, the block of mass m is at rest on an inclined plane that makes an angle ? with the horizontal. The force of static friction f must be such that
A) f > mg.
B) f > mg cos?.
C) f > mg sin?.
D) f = mg cos?.
E) f = mg sin?
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Graphical Analysis: An object is moving with constant non-zero velocity in the +x direction. The velocity versus time graph of this object is
A. a horizontal straight line. B. a vertical straight line. C. a straight line making an angle with the time axis. D. a parabolic curve.
Two extremely large nonconducting horizontal sheets each carry uniform charge density on the surfaces facing each other. The upper sheet carries +5.00 µC/m2. The electric field midway between the sheets is 4.25 × 105 N/C pointing downward
What is the surface charge density on the lower sheet? (?0 = 8.85 × 10-12 C2/N ? m2)
A particle moves at a constant speed in a circular path with a radius of 2.06 cm. If the particle makes four revolutions each second, what is the magnitude of its acceleration?
a. 20 m/s2 b. 18 m/s2 c. 13 m/s2 d. 15 m/s2 e. 24 m/s2
If R = 3.0 k?, C = 5.0 mF, ? = 6.0 V, Q = 15 mC, and I = 4.0 mA, what is the potential difference Vb ? Va?
a.
?3.0 V
b.
+9.0 V
c.
?15 V
d.
+21 V
e.
?6.0 V