3 years ago

A handel or knob is fixed at the free end of door. Why?

1 answer:

5 0

Maximum torque.
T=F.r
r is measured from point of turning, which is the hinge. r is maximum when the handle is at the free edge.

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Where $I$ is the sound intensity, $P$ is the power and $A$ is the area.

Since the loudspeaker radiates sound in all directions, we have a spherical sound wave where the radius r is the distance of the microphone from the speaker.

∴ $A$ is given by $4\pi r^{2}$ where $r$ is the radius

From the question, $P$ = 33.0W, $r$ = 52.0m

$I=\frac{P}{A} = \frac{P}{4\pi r^{2} }$

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∴ $I = 9.71\times10^{-4} W/m^{2}$

Hence, the sound intensity at the position of the microphone is 9.71 × 10⁻⁴ W/m²

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