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3 years ago

7

What frequency will you hear if a truck is driving toward you at 20 m/s sounding a horn of frequency 300 Hz. Assume the speed of

sound to be 340 m/s.

1 answer:

Damm [24]3 years ago

6 0

Answer:

=319Hz

Explanation:

This question is on sound waves

General formulae;

Frequency of observer= f of source*[ (v of sound+ v of observer)/(v of sound-v of source)]

where f is frequency and v is velocity

Given;

Velocity of sound = 340m/s

frequency of source = 300 Hz

Velocity of observer=0m/s

Velocity of source/truck= 20m/s

Substitute values in the formulae;

Frequency of observer= 300× {(340+0)/(340-20)}

=300×{ 340/320}

=300×340/320

=318.75

=319Hz

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Explanation:

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50(0) = 0 J

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3 years ago

A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equ

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Answer:

a) $k=19.6N/m$

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Explanation:

From the question we are told that:

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Mass $m=0.30kg$

Total stretch length $L_t=0.150+0.100=>0.25$

a)

Generally the equation for Force F on the spring is mathematically given by

$F=-km\\\\k=F/m\\\\k=\frac{m*g}{x}\\\\k=\frac{0.30*9.8}{0.15}$

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$\omega=\frac{2\pi}{T}$

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Generally the equation for the Frequency is mathematically given by

$F=\frac{1}{T}$

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3 years ago

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