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3 years ago

5

Which way does the friction arrow go in a free body diagram for a moving object point

2 answers:

True [87]3 years ago

7 0

Answer:

Frictional force opposes relative motion between surfaces

Explanation:

Friction that exists when the object is not moving is called static friction. In static friction ,If we are applying a force in the object the frictional force is in the opposite direction . If it is not the case, there have been some net force and the object starts accelarating.

The main component of the contact force of two objects is normal force and that is in the perpendicular direction. Frictional force is other complnent. This frictional force is parallel to the interface between objects. Frictional force opposes relative motion between surfaces.

Oliga [24]3 years ago

7 0

Answer:

Frictional force opposes relative motion between surfaces

Explanation:

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By what factor must the amplitude of a sound wave be decreased in order to decrease the intensity by a factor of 3?

s344n2d4d5 [400]

Answer:

Amplitude is decreased by a factor of $\sqrt3$ if intensity is decreased by a factor of 3.

Explanation:

Intensity of a sound wave is directly proportional to the square of its amplitude.

Therefore, if intensity is $I$ and amplitude is $A$ , then

$I=kA^2$ , where, $k$ is constant of proportionality.

Now, if intensity of sound wave is decreased by a factor of 3. So,

New intensity is, $I_{new}=\frac{I}{3}$

$I_{new}=kA_{new}^2\\\frac{I}{3}=kA_{new}^2$

Plug in $kA^2$ for $I$ . This gives,

$\frac{kA^2}{3}=kA_{new}^2\\A_{new}^2=\frac{A^2}{3}\\A_{new}=\sqrt{\frac{A^2}{3}}=\frac{A}{\sqrt{3}}$

Therefore, amplitude is decreased by a factor of $\sqrt3$ .

4 0

3 years ago

A car moving with a speed of 35 m/s sees a child standing in the

zlopas [31]

Answer:

2100 N

Explanation:

$v = u + at \\ 0 = 35 + a(5) \\ a = - 7m {s}^{ - 2} \\ \\ net \: force \: = ma \\ = (300)(7) \\ = 2100 \: newtons$

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3 years ago

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kirza4 [7]

Answer:ghhg

Explanation:

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3 years ago

We place a small pressure sensor at a certain depth in water. with which orientation does the sensor register the greatest press

Dominik [7]

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3 years ago

If clouds were made of cotton-candy what is rain

dlinn [17]

Answer:

If clouds were made of cotton candy, I think rain would be soda.

Or liquified sugar.

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2 years ago

Read 2 more answers