A continuous sinusoidal longitudinal wave is sent along a very long coiled spring from an attached oscillating source. The wave travels in the negative direction of an x axis; the source frequency is 25 Hz; at any instant the distance between successive points of maximum expansion in the spring is 24 cm; the maximum longitudinal displacement of a spring particle is 0.30 cm; and the particle at x = 0 has zero displacement at time t = 0. If the wave is written in the form s ( x , t ) = s m cos( kx ± ωt ), what are (a) s m , (b) k , (c) ω , (d) the wave speed, and (e) the correct choice of sign in front of ω ?
A continuous sinusoidal longitudinal wave is sent along a very long coiled spring from an attached oscillating source. The wave travels in the negative direction of an x axis; the source frequency is 25 Hz; at any instant the distance between successive points of maximum expansion in the spring is 24 cm; the maximum longitudinal displacement of a spring particle is 0.30 cm; and the particle at x = 0 has zero displacement at time t = 0. If the wave is written in the form s ( x , t ) = s m cos( kx ± ωt ), what are (a) s m , (b) k , (c) ω , (d) the wave speed, and (e) the correct choice of sign in front of ω ?
A continuous sinusoidal longitudinal wave is sent along a very long coiled spring from an attached oscillating source. The wave travels in the negative direction of an x axis; the source frequency is 25 Hz; at any instant the distance between successive points of maximum expansion in the spring is 24 cm; the maximum longitudinal displacement of a spring particle is 0.30 cm; and the particle at x = 0 has zero displacement at time t = 0. If the wave is written in the form s(x, t) = sm cos(kx ± ωt), what are (a) sm, (b) k, (c) ω, (d) the wave speed, and (e) the correct choice of sign in front of ω?
Checkpoint 4
The figure shows four orientations of an electric di-
pole in an external electric field. Rank the orienta-
tions according to (a) the magnitude of the torque
on the dipole and (b) the potential energy of the di-
pole, greatest first.
(1)
(2)
E
(4)
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The compound beam is fixed at Ę and supported by rollers at A and B. There are pins at C and D. Take
F=1700 lb. (Figure 1)
Figure
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Solved Part A The compound
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Problem
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Những kết quả này có
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There are pins at C and D To F-1200 Egue!)
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Solved The compound b...
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