Hi guys! pls help I asked this question almost 2 times and still didn't receive my answers.....Thanks in advance..

The speed of sound in air doesn't depend on the frequency of the sound.  It depends on the temperature, pressure, and humidity of the air.  It's usually around 340 m/s .

Answer:

I think the answer is C too

Answer:

Trains stop in their own time.

Every freight train, every situation, every load is different. The distance it takes to halt a train in an emergency is based on multiple factors: the speed when the brakes are applied, the track's incline, the number of cars hooked behind the locomotives and the loading of those cars, the "brake delay" inherent in the train's hydraulic system, the friction-causing metallurgy of the wheels and tracks, the weather.

Even the engineer behind the controls can't know on any given day how long it would take to stop the train.

"There is no specific rule of thumb on that," said Greg Udolph, general manager of the Texas State Railroad, a freight and tourist line in East Texas running from Palestine to Rusk. "If the track is wet with dew it changes. Everything that can affect it does. A train takes as long to stop as it takes to stop. Sometimes it can be a mile. Sometimes it's less, sometime's it's more."

Explanation:

Hope this helps :)

Answer:

Daniel Bernoulli

Explanation:

Hope this helps! :)

Answer:

Daniel Bernoulli is the person who discovered that fast-moving fluids produce less pressure and slow-moving fluids produce greater pressure.

Answer:

Purple Car and Black Car

Explanation:

Have to be moving in acceleration to have acceleration, being at a constant speed isn't moving.

Answer:

211.89 km/h

Explanation:

Given that,

The speed of an airplance in North direction = 200 km/h

Speed in East direction = 70 km/h

We need to find the resultant speed of the airplane. It can be calculated as the resultant of the two velocities as follows :

[tex]v=\sqrt{200^2+70^2} \\\\=211.89\ km/h[/tex]

So, the required speed is 211.89 km/h.

Answer:

a lens is scattering light

Explanation:

Diagram B shows a plano concave lens. Plano-Concave lenses bend parallel input rays to diverge from one another on the output side of the lens and hence have a negative focal length.

In the given figure, a Plano concave lens is shown. It scatters light. The image is formed in front of lens. The formed image is virtual.

Hence, the correct option is (c) "a lens is scattering light".

Answer:

Look below.

Explanation:

All the symptoms provided points to the common problem of dehydration. Especially a physically active person because they are constantly sweating which leads to the loss of bodily fluids and dehydration.

Answer:

B

Explanation:

Remark

If, when it reaches its maximum height where the PE is the greatest, that the maximum energy is when the ball is first kicked. That would mean its starting energy is 10 Joules.

Formula

KE = 1/2 m v^2

Givens

KE = 10 J

m = 0.2 kg

v = ?

Solution

10 = 1/2 * 0.2 * v^2

10 * 2 = 0.2 * v^2

20 = 0.2 * v^2

20/0.2 = v^2

100 = v^2

v = 10 m/s

Answer:

The deceleration is -7.85x10³ rad/s².

Explanation:

The angular speed (ω) is related to frequency (f) as follows:

[tex] \omega = 2\pi f [/tex]

When the frequency is 30 Hz the angular speed is:

[tex] \omega_{i} = 2\pi f = 2\pi*30 Hz = 188.5 rad/s [/tex]

Now, when the frequency is 20 Hz the angular speed is:

[tex] \omega_{f} = 2\pi*20 Hz = 125.7 rad/s [/tex]

Finally, the angular acceleration (α) can be found using the following equation:

[tex] \omega_{f}^{2} = \omega_{i}^{2} + 2\theta \alpha [/tex]

Where:

θ: is the angular displacement = 72°

[tex] \alpha = \frac{\omega_{f}^{2} - \omega_{i}^{2}}{2\theta} [/tex]

[tex] \alpha = \frac{(125.7 rad/s)^{2} - (188.5 rad/s)^{2}}{2*72*\frac{2\pi rad}{360}} = -7.85 \cdot 10^{3} rad/s^{2} [/tex]        

Therefore, the deceleration is -7.85x10³ rad/s².

I hope it helps you!                  

Answer:

frequency is .167/s for this wave

Answer:

wave speed=frequency×wave length

frequency=15/2.5

=6

i hope this helps

Answer:

increases over time is the correct answer

Explanation:

Answer:

a

Explanation:

time=540×60

=32400

f=1÷t

=1÷32400

f=3.09

f=3

The frequency is 3 Hz.

To calculate the frequency of the pendulum, the values given are

t = 540 minute

       The frequency of the simple pendulum can be described through the pendulum moves and come back to its own position for the specific period of the time. Also the pendulum frequency depends upon its length and mass.

Thus, frequency formula can be,

                        ω = √g/l

                       T = 2π / ω

        Frequency, f = 1 / T = ω / 2π

As we have to find the frequency, the time period will be reciprocal.

                        f = 1/ T Hz.

t = 540 per minute

 = 540 × 60 seconds

 = 32400 seconds

f = 1 / 32400

 = 3.08 × 10 ⁻⁶

f = 3 Hz

The frequency thus calculated as 3Hz.

Hence, Option A is the correct answer.

Learn more about the simple pendulum frequency,

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Explanation:

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Answer:

22.5/s is the frequency of the wave

Given:

We know,

→ [tex]Frequency (f) = \frac{C}{\lambda}[/tex]

By substituting the values,

                         [tex]= \frac{450}{20}[/tex]

                         [tex]= 22.5 \ Hz[/tex]

Thus the approach above is right.

Learn more about frequency here:

https://brainly.com/question/25601011

Answer:

they will fall down

Explanation:

Answer:

a = 3 m/s^2

Explanation:

Vi = 10 m/s

Vf = 40 m/s

t = 10 s

Plug those values into the following equation:

Vf = Vi + at

40 = 10 + 10a

---> a = 3 m/s^2

The car is traveling with an initial velocity of 10 m/s, a final velocity of 40 m/s in the time period of 10 seconds, then the acceleration of the car is 3 m/s².

Acceleration describes a change in an object's velocity. By accelerating, decelerating, or changing direction of motion, an object's velocity may change.

An apple falling to the ground, the moon orbiting the earth, and a car stopping at a set of traffic lights are a few examples of acceleration. With the aid of these illustrations, we may better see that acceleration occurs whenever a moving object modifies its direction, speed, or both.

The given values according to the question are,

Initial velocity, u = 10 m/s

Final velocity, v = 40 m/s and,

Time, t = 10 seconds.

Use the equation of motion to find the acceleration,

v = u + at

40 = 10 + (a)10

a = 30/10

a = 3 m/s².

Hence, the acceleration of the car is 3 m/s².

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Answer:

A vector in physics is a quantity that has both magnitude and direction.

Answer:

a line that usually veers and can be the result of force. Examples of Vector in a sentence. Military aviators study the vector between their aircraft and the enemy in order to calculate how to intercept.

Explanation:

Answer:

Higher Amplitude = Higher Energy.

Explanation:

As you could see the higher number the amplitude is the energy also gets higher!

Answer: English

. mathematician

. physicist

. astronomer

. theologian

. author

Explanation:

Take the points, Im leaving Brainly..​ Why?!

[tex]\huge\bf\maltese{\underline{\red{Thanks}}}\maltese[/tex]

Answer:

There are a many ways to produce electricity. Electrons can flow between certain different materials providing a current, as in a common battery. While reliable and portable, chemical batteries run down quickly. To provide the large amounts of steady power demanded by modern societies, large power plants have been built. Most power plants make electricity with a machine called a generator.

A 1925 Turbine Rotor

A 1925 turbine rotor for a Westinghouse generator, Image #21.035, Science Service Historical Image Collection, National Museum of American History

Generators have two important parts: the rotor (which rotates) and the stator (which remains stationary). Generators use the principle of electro-magnetic induction, which exploits the relation between magnetism and electricity. In large AC generators, an outer shell with powerful magnets rotates around a stationary "armature" which is wound with heavy wire. As they move, the magnets induce an electric current in the wire.

It is important to recognize that electricity is not mined or harvested, it must be manufactured. And since it's not easily stored in quantity, it must be manufactured at time of demand. Electricity is a form of energy, but not an energy source. Different generating plants harness different energy sources to make electric power. The two most common types are "Thermal Plants" and "Kinetic Plants".

Answer:

C

Explanation:

Answer:

A. NGC 3603 would be classified as Nebula

Explanation:

Answer:charge and a 0.04 C charge are separated by a distance of 3.0 m. At what position between the two charges would a test charge experience an electric field intensity of zero? Answers 1. The magnitude of the electric field

Explanation:

Answer:

Explanation:

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All that woofin' on the net , I thought you was a thug

They ain't got nowhere to go, I sh0t up everywhere they was

Yeah, you know who took that - from you

Come get it back in blood

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