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4 years ago

Why does the energy of a sound wave decrease over time

1 answer:

6 0

Sound is a longitudinal wave that carries energy. Sound needs a medium to propagate through (this means that sound cannot propagate in vacuum).

The medium usually determines the speed of the wave travelling through it.

As the sound waves travel in a medium, this medium begins to decrease, therefore, the energy of the sound also decreases.

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Which object has the least amount of kinetic energy? a car driving down a road a soccer ball rolling down a hill a bicycle locke

mars1129 [50]

<span> a bicycle locked to a bike rack im pretty sure</span>

7 0

3 years ago

Read 2 more answers

Suppose I produce radio waves with an antenna that have a peak electric field amplitude E and peak magnetic field amplitude B. I

denis23 [38]

Answer:

Correct answer is 2B

Explanation:

The electric field magnitude and magnetic field magnitude in an electromagnetic waves are related as under

$E=cB$

where 'c' is velocity of light in the medium of transmission

According to the given question if we double the electric field we have

$2E=cB'\\\\2cB=cB'\\\\B'=2B$

Thus the magnetic field also doubles

3 0

3 years ago

A 2 kg ball of clay moving at 35 m/s strikes a 10 kg box initially at rest. What is the velocity of the box after the collision?

Ainat [17]

Answer:

V = 5.83 m/s

Explanation:

Given that,

Mass of a ball of a clay, m = 2 kg

Initial speed of the clay, u = 35 m/s

Mass of a box, m' = 10 kg

Initially, the box was at rest, u' = 0

We need to find the velocity of the box after the collision. Let V be the common speed. Using the conservation of momentum to find it.

$mu+m'u'=(m+m')V\\\\V=\dfrac{mu+m'u'}{(m+m')}\\\\V=\dfrac{2\times 35+10\times 0}{2+10}\\\\V=5.83\ m/s$

So, the velocity of the box after the collision is equal to 5.83 m/s.

4 0

3 years ago

1. Monique is nine weeks into her pregnancy, and she had an appointment with her doc tor today. She is very happy and excited be

djyliett [7]

Since Monique is able to hear the heartbeats of her baby, it's the Fetus stage of pregnancy when the body starts developing inside the womb.

<u>Explanation:</u>

The Fetus Stage of Pregnancy:

Once the 4th-7th weeks of pregnancy passed, the embryo start developing inside the womb of the mother and the respective symptoms reflects. This is the Fetus stage of pregnancy which occur in approximately around the 10th week of pregnancy.

In the fetus stage, the human body begins to develop inside the womb. In this phase, most of the organs are developed and the limbs starts to form firmly. The Fetus stage comes after the Embryo stage but usually, the transition varies according to the growth and circumstances of the atmosphere.

But, what is certain is that the mother can feel the impulse and heartbeats of the baby inside her womb which is an exciting and memorable feeling for her.

7 0

4 years ago

(a) A hole of 1 cm in diameter is drilled in a plate of steel at 20°C. What happens to the diameter of the hole as the steel is

Anestetic [448]

When heat is applied to a substance/material or steel in our case, a series of changes will occur, one of which is Expansion.

Hence the hole will expand from 1cm to a diameter that is greater.

Thermal expansion refers to the expansion or contraction of the dimensions of the solid, liquid or gas when their temperature is changed.

<h3>Types of Expansion</h3>

Linear expansion
Areal expansion and
Volumetric volume.

Learn more about expansion here:

brainly.com/question/1166774

8 0

3 years ago