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3 years ago

Which statements accurately describe mechanical waves

Physics

1 answer:

AleksAgata [21]3 years ago

7 0

Answer:

Explanation:

so a mechanical wave transfers energy through a medium but unlike other waves that move through very long distances

the distance of the mechanical wave is different

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Predict whether sound will would travel faster in air in summer or in winter?

Arisa [49]

In summer because the air in summer is less dense.

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3 years ago

A bus is designed to draw its power from a rotating flywheel that is brought up to 3000 rpm by an electric motor. The flywheel i

Arada [10]

To solve this problem we will apply the concept of rotational kinetic energy. Once this energy is found we will proceed to find the time from the definition of the power, which indicates the change of energy over time. Let's start with the kinetic energy of the rotating flywheel is

$E_r = \frac{1}{2} I\omega^2$

Here

I = moment of inertia

$\omega =$ Angular velocity

Here we have that,

$\omega = 3000\frac{rev}{min}(\frac{2\pi rad}{1rev})(\frac{1min}{60s})$

$\omega = 314.159rad/s$

Replacing the value of the moment of inertia for this object we have,

$E_r = \frac{1}{2} (\frac{MR^2}{2})\omega^2$

$E_r = \frac{1}{2} (\frac{2000(0.5)^2}{2})(314.159)^2$

$E_r = 1.233698*10^7J$

The expression for average power is

$P = \frac{E_r}{\Delta t}$

$\Delta t = \frac{E_r}{P}$

$\Delta t = \frac{1.233698*10^7}{20*10^3}$

$\Delta t = 616.8s \approx 620s$

Therefore the correct answer is 620s.

3 0

4 years ago

If the gravitational force between objects of equal mass is 2.30 x 10^‐8 N when the objects are 10.0 m apart, what is the mass o

Readme [11.4K]

Answer:

Mass of each objects, m = 185.69 kg

Explanation:

The gravitational force between two equal masses is, $F=2.3\times 10^{-8}\ N$

Separation between the masses, d = 10 m

Let m is the mass of each object. The gravitational force is given by :

$F=G\dfrac{m^2}{d^2}$

$m=\sqrt{\dfrac{F.d^2}{G}}$

$m=\sqrt{\dfrac{2.3\times 10^{-8}\times (10)^2}{6.67\times 10^{-11}}}$

m = 185.69 kg

So, the mass of each objects is 185.69 kg. Hence, this is the required solution.

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3 years ago

Why is physics used to study the heat absorbed by the ocean?

Wewaii [24]

Answer:

Explanation:

It absorbs gases, but also heat energy from the atmosphere, distributes them in its depths and thus slows down changes in the entire Earth system. The amount of energy absorbed by the ocean is therefore also an indication of the total heat absorbed by the planet.

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3 years ago

1. A person of mass 55 kg is in a bumper car that has a mass of 75 kg. They are together at a velocity of 8 m/s.

ExtremeBDS [4]

The momentum of the bumper car after the collision is 1,040 kgm/s.

<h3>Momentum of bumper</h3>

The change in momentum of the bumper is calculated as follows;

P = v(m1 + m2)

P = 8(55 + 75)

P = 1,040 kgm/s

The momentum of the bumper car after the collision is 1,040 kgm/s.

The direction is still the same.

Learn more about momentum here: brainly.com/question/7538238

#SPJ1

7 0

2 years ago

Which statements accurately describe mechanical waves​

Which statements accurately describe mechanical waves