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4 years ago

Please help! 80 points will give brainiest!!!

Physics

2 answers:

AVprozaik [17]4 years ago

7 0

Answer:

The frequency, f, is 250 Hz. Hz is cycles per second. Hence a number divided by seconds.

The wavelength, λ, is 1.5 m.

The speed is v. Which is frequency times wavelength.

v = f xλ

Hence 250Hz*1.5m= 375 meters per second or 375 m/s

Explanation:

hope this helps mark me brainliest pls

lys-0071 [83]4 years ago

4 0

Explanation:

The expression for the speed of the sound in terms of frequency and the wavelength is as follows;

$v=\nu \lambda$

Here, v is the speed, $\nu$ is the frequency of the wave and $\lambda$ is the wavelength of the wave.

It is given in the problem that a sound wave has a frequency of 250 Hz and a wavelength of 0.35 m.

Calculate the speed of the sound wave.

$v=\nu \lambda$

Put $\nu= 250 Hz$ and $\lambda= 0.35 m$ .

$v=(250)(0.35)$

v= 87.5 m/s

Therefore, the speed of the sound wave is 87.5 m/s.

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3 years ago

A car is moving at 19 m/s along a curve on a horizontal plane with radius of curvature 49m.

JulsSmile [24]

Answer:

$\mu =0.75$

Explanation:

Frictional Force

When the car is moving along the curve, it receives a force that tries to take it from the road. It's called centripetal force and the formula to compute it is:

$F_c=m.a_c$

The centripetal acceleration a_c is computed as

$\displaystyle a_c=\frac{v^2}{r}$

Where v is the tangent speed of the car and r is the radius of curvature. Replacing the formula into the first one

$F_c=m.\frac{v^2}{r}$

For the car to keep on the track, the friction must have the exact same value of the centripetal force and balance the forces. The friction force is computed as

$F_r=\mu N$

The normal force N is equal to the weight of the car, thus

$F_r=\mu .m.g$

Equating both forces

$\displaystyle \mu .m.g=m.\frac{v^2}{r}$

Simplifying

$\displaystyle \mu =\frac{v^2}{rg}$

Substituting the values

$\displaystyle \mu =\frac{19^2}{(49)(9.8)}$

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4 years ago

Explain what a concentration gradient is and what it means for a molecule to diffuse down its

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Answer:

Diffusing the gradient ensures that most of the molecules in high concentration zone will wind up in the previously low concentration by the spontaneous movement of small molecules.

Explanation:

A gradient of concentration is the difference between in concentration of one place / area substance to different area. Having a molecule flow down its concentration gradient means moving the molecules from hypotonic areas to the concentration hypertonic areas

Diffusing the gradient ensures that most of the molecules in high concentration zone will wind up in the previously low concentration by the spontaneous movement of small molecules.

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3 years ago