Pls someone help me plss guys!!!
I will give you brainiest

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:

A plane's engines are designed to move it forward at high speed. That makes air flow rapidly over the wings, which throw the air down toward the ground, generating an upward force called lift that overcomes the plane's weight and holds it in the sky. The wings force the air downward and that pushes the plane upward.

Explanation:

planes stay in air because of 2 reasons :

Plane's wings are designed to push the air downwards and letting the plane to lift off and stay in air..

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.

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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:

Refer to the attachment..

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:

A. NGC 3603 would be classified as Nebula

Explanation:

Answer:

increases over time is the correct answer

Explanation:

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:

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:

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".

Explanation:

I love you

mujhe bhi bolo

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.

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Answer: The first one is A and C

Explanation:

Answer:

2 is A

3 is C

Explanation:

The reason why two is a is think of it like this. atoms have to be combined together to make a molecule. So in other words you need letters to create a word.

3 is c because in a recipe you have to have the right proportions. Just like you have to have the right proportions of atoms to create a molecule.

Answer:

frequency is .167/s for this wave

Answer:

wave speed=frequency×wave length

frequency=15/2.5

=6

i hope this helps

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:

The stone is accelerating at 9.8 m/s².  If we multiply that by three seconds, we get 29.4 m/s.

Answer:

Higher Amplitude = Higher Energy.

Explanation:

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

Wave Speed (M/s) = Frequency (Hz) x Wavelength (M)

Wave Speed = 3500Hz x 2.8M = 9800M/s

Answer = Top one

Answer:

A

Explanation:

3500Hz*2.5m=9800m/s

Give Brillienst please!!!!

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:

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:

Explanation:

Pooh Shiesty, that's my dawg

But Pooh, you know I'm really shiesty

You told all them O.T. ni  ggas that you really slide

Tell the truth about your gang, they really dyin'

I got my own fire, don't need security in the club

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

Come get it back in blood

Answer:

Explanation:

Remark

This is a conservation problem.

The momentum before impact = momentum after impact

momentum before

m = 0.04 kg

v = 300 m/s

momentum after

m = 0.5 kg + 0.04kg    That's the mass of the block and bullet

v = ?

Solution

0.04 * 300 = 0.54 * x

12 kg m/s   = 0.54 kg * x

12 / 0.54 = x

x = 22.22 m/s

Answer:

the height of the hill is 8.622 m.

Explanation:

Given;

mass of the cart, m = 90 kg

speed of the cart at the base, v = 13 m/s

Let the height of the hill = h

Apply the principle of conservation of energy, to determine the height of the hill.

¹/₂mv² = mgh

¹/₂v² = gh

[tex]h= \frac{1}{2} \times \frac{v^2}{g} \\\\h = \frac{1}{2} \times \frac{13^2}{9.8} \\\\h = 8.622 \ m[/tex]

Therefore, the height of the hill is 8.622 m.