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2 years ago

Which statement is true of a mechanical wave?

Physics

1 answer:

svet-max [94.6K]2 years ago

7 0

It must have a medium. It must travel in empty space. Mechanical waves are waves which needs medium of propogation.

You might be interested in

I drop an egg from a certain distance and it takes the egg 3.74 seconds to reach the ground. How high up was the egg?

Ulleksa [173]

Answer:

B. 68.6m

Explanation:

Free Fall Motion

When a body is left to move in the air with no friction, the motion is ruled only by the force of gravity. The vertical distance a body travels in the air after a time t is .

$\displaystyle y=\frac{gt^2}{2}$

We know the egg takes 3.74 seconds to reach the ground. The height it was launched from is

$\displaystyle y=\frac{(9.8)(3.474)^2}{2}$

$\displaystyle y=68.54\ m$

The closest correct option is

B. 68.6m

5 0

3 years ago

A wheel rotates about a fixed axis with an initial angular velocity of 13 rad/s. During a 8-s interval the angular velocity incr

____ [38]

Answer:

The number of revolutions is 44.6.

Explanation:

We can find the revolutions of the wheel with the following equation:

$\theta = \omega_{0}t + \frac{1}{2}\alpha t^{2}$

Where:

$\omega_{0}$ : is the initial angular velocity = 13 rad/s

t: is the time = 8 s

α: is the angular acceleration

We can find the angular acceleration with the initial and final angular velocities:

$\omega_{f} = \omega_{0} + \alpha t$

Where:

$\omega_{f}$ : is the final angular velocity = 57 rad/s

$\alpha = \frac{\omega_{f} - \omega_{0}}{t} = \frac{57 rad/s - 13 rad/s}{8 s} = 5.5 rad/s^{2}$

Hence, the number of revolutions is:

$\theta = \omega_{0}t + \frac{1}{2}\alpha t^{2} = 13 rad/s*8 s + \frac{1}{2}*5.5 rad/s^{2}*(8 s)^{2} = 280 rad*\frac{1 rev}{2\pi rad} = 44.6 rev$

Therefore, the number of revolutions is 44.6.

I hope it helps you!

4 0

3 years ago

Earthquakes usually happen at: - folds - mountains - fault lines

anastassius [24]

Answer:

Fault lines

Explanation:

8 0

3 years ago

How is the bike in the picture a system and how is the Earth a system?

JulijaS [17]

Answer:

The earth is a vast, complex system powered by two sources of energy: an internal source (the decay of radioactive elements in the geosphere, which generates geothermal heat) and an external source (the solar radiation received from the Sun); the vast majority of the energy in the earth system comes from the Sun.

Explanation:

becuse

4 0

3 years ago

The blank the value of coefficient of friction the greater the resistance to sliding

expeople1 [14]

Answer:

The HIGHER value of coefficient of friction the greater the resistance to sliding

Explanation:

As we know that friction force is given by

$F_f = \mu F_n$

so friction force is the product of friction coefficient and normal force.

So here we can say that if friction coefficient is higher then the friction force will be more as it is product of friction coefficient and normal force.

So correct answer will be given as

The HIGHER value of coefficient of friction the greater the resistance to sliding

8 0

4 years ago

Read 2 more answers