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3 years ago

What is the speed of sound for a noise that travels 2km in 5.8s?

Physics

1 answer:

Gnesinka [82]3 years ago

5 0

Answer:

Explanation:

Speed is defined as the rate at which an object covers a particular distance. So the formula for determining speed is given as the ratio of distance to time taken for covering that distance.

Speed = Distance/Time

As here the distance is given in km units and time in s units, so the units of any one parameter should be changed. Since we know that speed of sound is always about 300 m/s. So it is better to convert the unit of distance from km to m.

Hence, now the distance traveled by the noise is 2000 m and time taken is 5.8 s.

So the speed of noise = Distance/Time = 2000/5.8=345 m/s.

Thus, the speed of noise is slightly greater than the speed of sound and it is found to be 345 m/s.

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1 year ago

If a hypothesis is.......

Varvara68 [4.7K]

Answer:

a correct

Explanation:

a hypothesis is a supposition made of a basis of limited evidence

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2 years ago

Read 2 more answers

Select ALL of the following that are vector quantities.

Dahasolnce [82]

Answer:

166 kg *m/s

44 N upward

39 m/s east

Explanation:

The short answer: If it has direction, it's a vector.

The long answer:

Vectors, unlike scalars, have direction. The first one, 166 kg*m/s is momentum, since momentum is velocity*mass, and velocity is a vector, momentum must be a vector.

44 Newtons is a vector since it has direction, in this case, upward. Force is acceleration*mass, and since acceleration is a vector, force must be a vector.

39 m/s is velocity, velocity has a direction, therefore it's a vector.

13.7 grams is mass since mass doesn't change with direction, it's a scalar, the opposite of a vector.

86 miles per hour has speed, but speed has no direction, therefore it's a scalar.

12 meters is distance, distance has no direction, therefore it's a scalar.

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2 years ago

A circular loop of flexible iron wire has an initial circumference of 170 cm , but its circumference is decreasing at a constant

erastova [34]

Answer:

after 9.00 s ; the magnitude of the induced emf = 0.000944 V

The induced current will be in the clockwise direction.

Explanation:

To find the circumference of the circle ; we use the expression:

C = 2πr

differentiating the above expression to determine the rate of change of the circumference; we have:

$\frac{dC}{dt} = 2 \pi \frac{dr}{dt}$

Here ; the rate of change of the circumference is $\frac{dC}{dt}$

Replacing 12.0 cm/s for $\frac{dC}{dt}$ ; we have :

$2 \pi \frac{dr}{dt} = - 12.0 cm/s ------ \ (equation \ 1 )$

However ;the area of the circle is expressed as:

A = πr²

Also; the rate of change of the area is determined as;

$\frac{dA}{dt} = d \frac{\pi r^2}{dt}$

$\frac{dA}{dt} = 2 \pi r \frac{dr}{dt} ------ \ (equation \ 2)$

Here; the rate of change of area is $\frac{dA}{dt}$

Replacing - 12.0 cm/s for $2 \pi r \frac{dr}{dt}$ in equation (2) ; we have:

$\frac{dA}{dt} =(-12.0 \ cm/s) r ------ \ (equation \ 3)$

Now; after 9.00 s ; the value of circumference of the loop is decreased by:

$C_f = ((12.0 \ cm/s )( \frac{1 \ m}{10^2 \ cm}))(9 \ s)$

= 1.08 m

The expression for the circumference of the loop after 9.00 s is:

$C = C_i - C_f$

Given that :

$C_i ( initial \ circumference) = 170 \ cm = 1.7 \ m$

C = ( 1.7 - 1.08) m

C = 0.62 m

Recall that :

C = 2πr

0.62 = 2×3.14 × r

r = $\frac{0.62}{2*3.14}$

r = 0.099 m

Replacing r = 0.099 m into equation (3)

$\frac{dA}{dt} =((-12.0 \ cm/s )( \frac{1 \ m}{10^2 \ cm}))(0.099 \ m)$

$\frac{dA}{dt} =-0.01188 m^2/s$

From Faraday's law, Induced emf (ε) is expressed as:

$\epsilon = - \frac{d \phi }{dt}$

and the magnetic flux is given as:

$\phi = BAcos \theta$

replacing the value of $\phi$ into above equation; we have:

$\epsilon = - \frac{d \ (BAcos \theta) }{dt}$

= $- B cos \theta \frac{d(A)}{dt}$

where θ = 0 ; B = 0.800 T and $\frac{dA}{dt}$ = -0.0118 m²/s

$\epsilon = -(0.800 \ T) (cos 0) (-0.0118 m^2/s)$

$\epsilon = 0.000944 \ V$

Therefore; after 9.00 s ; the magnitude of the induced emf = 0.000944 V

b) The magnitude of id directing into the plane; However ; considering Lenz's law ; it states that the changes produced in the field will be opposed by the induced current. Thus ; it is found that the direction of the current will be in clockwise direction.

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3 years ago

Read 2 more answers

What is the speed of sound for a noise that travels 2km in 5.8s?​

What is the speed of sound for a noise that travels 2km in 5.8s?