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3 years ago

We can block light by placing obstacles in its path, but it’s much more difficult to block sound. Why?

Physics

2 answers:

Flauer [41]3 years ago

8 0

<h3>Answer;</h3>

B. Sound waves can move through various mediums.

<h3>Explanation;</h3>

A wave is a transmission of a disturbance from one point to another. It involves transmission of energy from the source to another point.
A wave may or may not require a medium for transmission. Waves that require medium for transmission are called mechanical waves and those that do not require medium for transmission are known as electromagnetic waves.
Light is an example of electromagnetic wave therefore it can be blocked when obstacles are placed on its path. However, for the case of sound waves, they can not be blocked by an obstacle as sound would travel through the medium used to block.

mamaluj [8]3 years ago

6 0

Answer:

B. Sound waves can move through various mediums.

Explanation:

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3 years ago

A slingshot is used to launch a stone horizontally from the top of a 20.0 meter cliff. The stone lands 36.0 meters away.

alisha [4.7K]

A)

It is a launch oblique, therefore the initial velocity in the vertical direction is zero. Space Hourly Equation in vertical, we have:

$S=S_{o}+v_{o}t+ \frac{at^2}{2} \\ 20= \frac{10t^2}{2} \\ t=2s$

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$\Delta v= \frac{\Delta S}{\Delta t} \\ v_x= \frac{36}{2} \\ \boxed {v_{x}=18m/s}$

B)

Using the Velocity Hourly Equation in vertical direction, we have:

$v_{y}=v_{y_{o}}+gt \\ v_{y}=10\times2 \\ \boxed {v_{y}=20m/s}$

The angle of impact is given by:

$cos(\theta) =\frac{v_{x}}{v_{y}} \\ cos(\theta) = \frac{18}{20} \\ cos(\theta) =0.9 \\ arccos(0.9)=\theta \\ \boxed {\theta \approx 25.84}$

If you notice any mistake in my english, please let me know, because i am not native.

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