Potential of Point-Charges: Two 3.0 ?C charges lie on the x-axis, one at the origin and the other at 2.0 m. What is the potential (relative to infinity) due to these charges at a point at 6.0 m on the x-axis? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 11,000 V
B. 9000 V
C. 14,000 V
D. 3400 V
Answer: A
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If the electric field and magnetic field of an electromagnetic wave are given by E = E0 sin(kx - ?t) and B = B0 sin(kx - ?t), and if the value of E0 is 51 µV/m, what is the value of B0? (c = 3.0 × 108 m/s)
A) 1.7 × 1014 T B) 1.7 × 103 T C) 1.7 × 10-14 T D) 1.7 × 104 T E) 1.7 × 10-13 T
A long string is pulled so that the tension in it increases by a factor of four. If the change in length is negligible, by what factor does the wave speed change?
a. 0.25 c. 2.0 b. 0.50 d. 4.0
An airplane flies between two points on the ground that are 500 km apart. The destination is directly north of the origination of the flight
The plane flies with an air speed of 120 m/s. If a constant wind blows at 10.0 m/s due west during the flight, what direction must the plane fly relative to north to arrive at the destination? A) 4.78° west of north B) 4.76° east of north C) 4.78° east of north D) 4.76° west of north E) 85.2° west of north
Intensity of Sound: What is the intensity of a 70-dB sound? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 10-4 W/m2 B. 10-5 W/m2 C. 10-6 W/m2 D. 10-7 W/m2