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blagie [28]
3 years ago
11

Why does a spherometer have three legs​

Physics
1 answer:
Lana71 [14]3 years ago
8 0
So the three legs will always touch the glass
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If an object is stationary (not moving), what must the net force be equal to?
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Firstly, we can state that the net force is the sum of all forces acting upon the object. Since the object is stationary, by Newton's First Law we can conclude that the sum of all forces acting upon a stationary object is 0 because there are no forces acting upon the object.

Explanation:

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The speed of sound at sea level is normally about 340 m/s. A stationary fire alarm has a frequency of 15,000 Hz. An observer run
Musya8 [376]

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The velocity of the observer is 6.8 m/s

Explanation:

Doppler effect equation is given by the formula:

f'=\frac{v+v_o}{v-v_s} f\\\\where\ f'\ is \ the\ observed \ frequency=15300\ Hz,v_o\ is\ the\ velocity\ of\ the\ observer,\\v_s\ is\ the\ velocity\ of \ source=0,v\ is\ the\ velocity\ of\ sound=340\ m/s\ and\ f\ is\ actual\\frequency=15000\ Hz.\\\\substituting:\\\\15300=15000(\frac{340+v_o}{340} )\\\\340+v_o=346.8\\\\v_o=6.8\ m/sThe velocity of the observer is 6.8 m/s

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