The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and ? = 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?
a.
0.44
b.
0.33
c.
0.38
d.
0.28
e.
0.17
d
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Intensity: An 800-kHz sinusoidal radio signal is detected at a point 2.1 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.80 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity of the radio signal at that point? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 8.5 × 10-4 W/m2 B. 1.2 × 10-3 W/m2 C. 1.7 × 10-3 W/m2 D. 6.0 × 10-4 W/m2 E. 4.2 × 10-4 W/m2
Because of Earth's rotation, a swinging pendulum rotates about a vertical axis once every twenty-four hours.
a. true b. false
An ac generator contains 80 flat rectangular loops of wire, each of which is 12 cm long and 8 cm wide. The loops rotate at 1200 rpm about an axis through the center and parallel to the long side
If the magnetic field in which the loop rotates is uniform, has magnitude 0.30 T, and is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? A) 20 V B) 27 V C) 35 V D) 29 V
If a charge of 12 ?C is located 5.0 cm from a charge of 6.5 ?C, the potential energy of this arrangement is
A) 1.4 × 10-5 J. B) 14 J. C) 0. D) 2.8 × 10-4 J. E) 281 J.