If the velocity of wind is doubled, then the power output will increase by
A. 10 times
B. 8 times
C. 2 times
E. 6 times
Answer: B. 8 times
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In ultrasound the _____________ of the sound is much greater than in normal sound
a. frequency b. period c. wavelength d. amplitude e. speed
Force on a Moving Charge: We observe that a moving charged particle experiences no magnetic force. From this we can definitely conclude that
A. no magnetic field exists in that region of space. B. the particle must be moving parallel to the magnetic field. C. the particle is moving at right angles to the magnetic field. D. either no magnetic field exists or the particle is moving parallel to the field. E. either no magnetic field exists or the particle is moving perpendicular to the field.
A boxcar is equipped with a red laser at the back of the car and a blue laser at the front of the car. When the boxcar is traveling with speed v, the two lasers send out pulses simultaneously. An observer on the ground sees
A. the two pulses hitting the opposite walls at the same time. B. the red pulse hitting the front before the blue pulse hits the back. C. the blue pulse hitting the back before the red pulse hits the front.
A charge Q is placed on the x axis at x = +4.0 m. A second charge q is located at the origin. If Q = +75 nC and q = -8.0 nC, what is the magnitude of the electric field on the y axis at y = +3.0 m?
a. 19 N/C b. 23 N/C c. 32 N/C d. 35 N/C e. 21 N/C