At a distance of 4.3 cm from the center of a very long uniformly charged wire, the electric field has magnitude 2000 N/C and is directed toward the wire
What is the charge on a 1.0 cm length of wire near the center? (?0 = 8.85 × 10-12 C2/N ? m2)
A) -0.056 nC B) -0.044 nC C) -0.048 nC D) -0.052 nC
C
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What frequency of sound traveling in air at 40 oC has a wavelength of 0.50 m?
a. 20 Hz b. 344.7 Hz c. 502.9 Hz d. 711.2 Hz
A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts falling down
Which of the following statements about the rock's motion are true just before it hits the ground? (There could be more than one correct choice.) A) Its horizontal velocity component is zero. B) Its velocity is vertical. C) Its vertical velocity component is the same as it was just as it was launched. D) Its horizontal velocity component is the same as it was just as it was launched. E) Its speed is the same as it was just as it was launched.
Intensity of Sound: The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the intensity level in dB? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 18 dB B. 23 dB C. 28 dB D. 32 dB
The position of an object that is oscillating on an ideal spring is given by the equation x = (12.3 cm) cos[(1.26s-1 )t]. At time t = 0.815 s,
(a) how fast is the object moving? (b) what is the magnitude of the acceleration of the object?