What is D ?
Its name the wave diagram.
B: Crest
A: Trough
C: wavelength

I think can someone check that. I think D might be amplitude but i don’t know.

Answer:

11.2 m/s

Explanation:

Average velocity = displacement / time

v = 100 m / 8.9 s

v = 11.2 m/s

Answer:

Testing

Explanation:

Scientific methods are the steps that scientists follow to find an answer to the questions and to find solutions to the problems. There are certain steps which are followed chronologically in the scientific method:

Answer:

1.) Momentum = 10 units

2.) Because of gravity

Explanation:

According to the Newton 3rd law of motion, we realise that in collision, momentum is always conserved.

So, if a ball is thrown upward with ten units of momentum initially, the “recoil” momentum of the earth will be approximately 10 units of momentum. We do not feel this because of the gravity.

Answer:

The answer is D

Explanation:

Answer: I think the answer is option D.

Answer:

c no definite shape and volume

The one that is the characteristic of gas is that it has no definite shape or definite volume. The correct option is A.

Gases have a number of distinctive characteristics. The fact that they don't have a set shape means that they can fit into and take on the shape of any container that they occupy.

Due to their high compressibility, gases can occupy a variety of spaces. Because of this, they lack a fixed volume.

Gaseous particles have the potential to disperse and diffuse because they are constantly moving, moving erratically and quickly.

Additionally, compared to liquids and solids, gases have lower densities. They also have traits like high thermal expansion and the capacity to mix and separate with ease.

Thus, the correct option is A.

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18.67

Explanation:

acceleration=Force÷mass

acceleration=140÷7.5

acceleration=18.67

Answer:

Explanation:

Force,F = mass,m × acceleration due to gravity,g

⇒g=F/m

⇒g=140/7.5

⇒g=18.67 N/kg

Answer:

18.5 m/s

Explanation:

Take down to be positive.

Given:

Δy = 10.0 m

v₀ = 12.0 m/s

a = 9.8 m/s²

Find: v

v² = v₀² + 2aΔy

v² = (12.0 m/s)² + 2 (10 m/s²) (10.0 m)

v = 18.5 m/s

Answer: d

One thirty-sixth of

Explanation: Gravitational field or gravitational field strength obeys the inverse square law. The gravitational field is inversely proportional to the square of the earth distance. That is,

g = Gm/r^2

Where r = distance.

If weather satellite is placed in orbit six times farther away from the earth's centre, gravitational field will be one thirty-sixth of its initial value.

Therefore, the gravitational field experienced by the satellite in orbit is one thirty-sixth of the field that it experienced on the ground.

Answer:

[tex]Momentum(p) = 20kgm/s[/tex]

Explanation:

Given

Mass = 10kg

Velocity = 2m/s

Required

Calculate the momentum of the man

Momentum is calculated as thus

[tex]Momentum(p) = Mass(m) * Velocity(v)[/tex]

or

[tex]p = mv[/tex]

So; to solve this question; we simply substitute 10kg for mass and 2m/s for velocity in the above formula;

The formula becomes

[tex]Momentum(p) = 10kg * 2m/s[/tex]

[tex]Momentum(p) = 10 * 2 * kg * m/s[/tex]

[tex]Momentum(p) = 20kgm/s[/tex]

Hence, the momentum of the man is [tex]20kgm/s[/tex]

Answer:

1Farahd

The equivalent capacitance in parallel 6F is now in series with

3F - 2F = 1F

Answer:

D

Explanation:

Mechanical energy is all about movement

Also kinetic and potential energy are mechanical

Answer:

force=2,time=4.5

Explanation:

Thats the answer

Answer: depth = 3.75 m

Explanation:

Taken the speed of the sound in sea to be V = 1500 m/s

The time between an echo sounder sending and receiving a pulse is 0.005 s. That is,

Total time T = 0.005

Formula for echo is:

V = 2X/T

Where X = distance covered

Substitute V and T into the formula

1500 = 2X/0.005

Cross multiply

7.5 = 2X

Make X the subject of formula

X = 7.5/2

X = 3.75 m

Therefore, the depth of the sea is 3.75 m

Answer:

Explanation: Work=force×distance

W=F×S  where W=10,000J,  F=m×g=225 kg×10 N/kg= 2250 N

⇒S=W/F

     = 10000/2250

     = 4.44 m

The box will be raised 4.53 m

Work done is defined as the product of component of the force in the direction of the displacement and the magnitude of  this displacement .

Work done = F .s = Fs cos (theta)

F = mg

s =h

theta = 0°

cos (theta) = cos 0 = 1

hence , work done = m*g*h

Potential energy is stored in the form of work done

potential energy = work done to raise the box = m*g*h

given

mass (m) = 225kg

work done(WD) = 10,000 J

height (h) = ?

potential energy = m*g*h

10,000 J= 225kg * 9.8m/s^2 * h

h = 4.53 m

The box will be raised 4.53 m

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Answer:

5 mph East.

Explanation:

If the girl is the frame of reference, we need to check the train's relative movement to the girl.

If the girl was not moving inside the train, the speed of the train would be zero, because the train and the girl would be moving together with the same speed and direction.

If the girl is moving 5 mph toward the back of the train, the movement of the train should be calculated considering the girl is fixed (not moving).

So the direction of the train movement would be the inverse of the girls movement (the girl is going West), then the speed and direction of the train is 5 mph and East.

Answer:

D. The Federal Reserve Bank can provide a short-term loan to banks

to prevent them from running out of money.

Explanation:

A bank run occurs when a large number of depositors withdraw their deposits simultaneously from a bank.

As the number of withdraws increases, the available cash in the bank decreases until a point that the bank can't give depositors their money.

In these situations, The Federal Reserve Bank acts as a lender of last resort that helps to reinforce the effect of deposit insurance, and to reassure bank customers that they will not lose their money.

Answer:

B

Explanation:

Heat flows from hot to cold to lower the temperature of hot areas and increase temperature of cold areas. The end result is that the 2 areas have the same temperature, thus increasing entropy.

Heat flows spontaneously from hot to cold, and entropy increases.

The second law of thermodynamics relates to the entropy of a system. According to the second law of thermodynamics, the total entropy of a system may increase or remain constant in a spontaneous process.

The implication of this is that the entropy of a system never decreases. The entropy of a system increases when heat flows from a hot to a cold body and not vice versa.

Hence, the statement that; "Heat flows spontaneously from hot to cold, and entropy increases" describes the second law of thermodynamics.

Answer:

Explanation:  

How does a force do negative work on an object ; This is when the direction of motion is opposite to the direction of the force

To solve this we must be knowing each and every concept related to work. Therefore, a force do negative work on an object,  when the direction of motion is opposite to the direction of the force.

A task requiring mentally or physically effort in order to accomplish a goal or outcome is referred to as labor in general. When we lift heavy objects off the ground or push or pull large objects, we are performing labor. When the direction of motion is opposite to the direction of the force, work is negative.

Another word we frequently use is energy. Energy and amount of work performed are typically associated, because a person who's really feeling particularly excited is capable of accomplishing a lot of work.

Therefore, a force do negative work on an object,  when the direction of motion is opposite to the direction of the force.

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Answer:

The fundamental wavelength of the vibrating string is 1.7 m.

Explanation:

We have,

Velocity of wave on a guitar string is 344 m/s

Length of the guitar string is 85 cm or 0.85 m

It is required to find the fundamental wavelength of the vibrating string. The fundamental frequency on the string is given by :

[tex]f=\dfrac{v}{2l}\\\\f=\dfrac{344}{2\times 0.85}\\\\f=202.35\ Hz[/tex]

Now fundamental wavelength is :

[tex]\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{344}{202.35}\\\\\lambda=1.7\ m[/tex]

So, the fundamental wavelength of the vibrating string is 1.7 m.

Answer:

the answer from nod energy from atoms

Answer:

Captive animals are animals that are maintained by people in an enclosed place not allowing them to be free. There are several factors that make it difficult to reintroduce them to their natural habitats like:

-Captive animals don't learn the necessary skills to survive in their natural habitats like hunting skills.

-They are too used to have contact with people which makes them vulnerable to hunters.

-Sometimes these animals are not able to integrate with a wild population.

-It has been found that some captive animals are more susceptible to diseases.

Answer: A

destructive interference

Explanation: Interference involves coming together of two waves of the same type. E.g sound waves, water waves e.t.c

Whenever two waves of different amplitude interferes with one another and there is increase in amplitude, this is known as constructive interference.

But whenever there is decrease in amplitude as a result of interference of the two waves, this is known as destructive interference.

If Two waves with amplitudes of 52 units and 98 units come together. Their amplitude, which is measured at a specific point and time, is 46 units. The wave behavior that explains this value is destructive interference because of decrease in the units of amplitude.

Answer:

destructive interference

Explanation: Plato user