Please heeelp meeeeeeeeee

Sound travels fastest in solids. A sound is a vibration that travels in a longitudinal direction through a medium in the form of a mechanical wave.

A sound is a vibration that travels in a longitudinal direction through a medium in the form of a mechanical wave.

It can propagate through a solid, a liquid, or a gas as its medium. Solids go the fastest, liquids are slower, and gases are the slowest.

Sound travels the quickest through a solid because the molecules are packed together densely, allowing sound waves to leap from one molecule to the next more quickly.

Because the molecules in solids are packed the tightest, sound travels the quickest through them, whereas sound travels the slowest through gases.

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Answer:

solids

Explanation:

Answer :- Option D

Explanation:-

Coz electric field inside a conductor is zero that's why we don't get electrocuted.

Hope it helps....

Answer:

word done = fore * distance moved by the force, so 11n * 0.8=8.8j then 8.8 * 6=52.8j

but all the books at ones means, 6*11=66N

and 66*0.8 = 52.8j

Explanation:

The work done is equal..

If you hold a heavy weight over your head, the work you do is Is converted into potential energy.

Work is said to be done when the applied force displaces an object over a given distance.

Work energy theorem states that, the work done on object is equal to change in mechanical energy of the object.

When an object is raised over a given distance the work done is equal to the potential energy of the object given as;

W = P.E = mgh

Thus, If you hold a heavy weight over your head, the work you do is Is converted into potential energy.

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Answer:

The heating curve for glass would be different from the heating curve for water because water has a strange behavior while glass also has a strange behavior but is different because it lacks the repeating crystalline structure of solids like ice, or water. Glass becomes soft and impressionable as temperature increases.

Since glass lacks the repetitive crystalline structure present in solids like ice or water, its strange behavior differs from that of glass when heated. This is because glass has a unique, strange behavior than water. As temperature rises, glass becomes brittle and impressionable.

A difference in temperature causes energy to flow from one body to another, recognized as heat. Energy is transferred, or heat flows, when two substances of different temperatures are brought together. The hotter body goes to the cold.

Typically, though not always, this energy transfer causes the temperature of the region of lower temperature to rise and the temperature of the warmer object to fall. It is possible for a substance to absorb heat without increasing its temperature by migrating from one physical state (or phase) to another, such as melting, sublimation, boiling, or shifting from one solid form to the other.

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Answer:

0 degrees latitude

Explanation:

At 0 degrees latitude, the Equator is an invisible line that circles the Earth's center.

Answer:

B)

Explanation:

Answer:

Always on the move

Nothing stays the same

The sun comes and goes

The night you can never escape

Nothing can last for ever

Everything we know rotates

I thought this would be more clever

But it's late and I don't know what else to say

Those were eight lines only

Counting lines makes you lonely

Sixteen is a big number

I feel like I'm going under

It's always daytime somewhere

But it will never be forever

I move in circles

This poem is over

Explanation:

Sorry I thought it would end up better than this

Answer: Gamma-rays have the smallest wavelengths and the most energy of any other wave in the electromagnetic spectrum. These waves are generated by radioactive atoms and in nuclear explosions. Gamma-rays can kill living cells, a fact which medicine uses to its advantage, using gamma-rays to kill cancerous cells.

Explanation: :)

Answer:

to reduce the pace of accident

Answer:

Fn = m g cos 30 = .15 * 9.81 * .866 = 1.27 N    force of plane on car

Fp = m g sin 30 = .15 * 9.81 * 1/2 = .736 N    force along plane

m g h = W = potential energy of car = original mechanical energy

1/2 m v^2 = m g h    equating PE and KE

v^2 = 2 g h = 2 * 9.81 * .8

v = 3.96 m/s    original speed of blue cart

Launch energy of red cart

1/2 m v^2 = .15 / 2 * 16 = 1.2 J      launch energy of red cart

m g h = .15 * 9.81 * .55 = .81 J       potential energy of red cart

Wf = (1.2 -.81) J = .39 J        work done against friction

Answer:

Actual mechanical advantage = force out / force in

250 N / 100 N = 2.5     force out is 2.5 X force provided

250 N * 10 m = 2500 Joules         work output

100 N * 50 m = 5000 Joules        work input

Efficiency is 2500 / 5000 = 50 %

Not sure what is meant by VR      

Answer:

answer is 250 W

Explanation:

W=P * t

t=60s

W= 15000J

15000= P * 60

P= 15000/60

P= 250W. (SI unit of power Watt)

The power of a machine is the rate of energy or work done by the machine. The power for 15000 J of energy in 1 minute is 250 W.

Power is a physical quantity that describes the rate of work done or energy of on an object. The work done is a vector quantity having magnitude and direction. Whereas, power is a scalar quantity.

When a force applied on a body makes its displaced, the force is said to be done work on the body. When the body do work by a restoring force then work is said to done by the body.

Work done is the product of power and time.

Given that, work done = 15000 J

time = 1 minute = 60 s

power = 15000 J /60 s = 250 W.

Therefore, the power of the machine is 250 W.

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40000 kg⋅m/s

momentum: mass * velocity

Question :-

Answer :-

[tex] \rule {180pt} {2pt} [/tex]

Given :-

To Find :-

Solution :-

As per the provided information in the given question, we have been given that the Mass of the car is 1000 Kg . Velocity of the car is given 40 m/s . And, we have been asked to calculate the Momentum of the car .

For calculating the Momentum , we will use the Formula :-

Therefore , by Substituting the given values in the above Formula :-

⇒ Momentum = Mass × Velocity

⇒ Momentum = 1000 × 40

⇒ Momentum = 40000

Hence :-

[tex] \underline {\rule {180pt} {4pt}} [/tex]

Answer:

T1 + T2 cos 60 = 1000 cos 15     balancing x-forces

T1 + T2 / 2 = 966         (I)

1000 sin 15 + .866 T2 = 1200    balancing y-forces

259 + .866 T2 = 1200

T2 = 941 / .866 = 1087          value for T2

T1 + 543 = 966         using equation (I)

T1 = 423

When there is a temperature difference/Gradient, heat flows from a region of high concentration to region of low concentration.

Thermal energy flow from region of higher temperature gradient to region of low temperature gradient till equilibrium is reached.

When the hot metal is places in a cold water bath, there will be a temperature difference and by conduction(water conducts heat) the heat will travel in the water medium and circulate till equilibrium

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Answer:

Static electricity

Explanation:

Opposite charges attract each other.

Answer:

Let's assume the metal spheres are solid metal, and not charged beforehand.

The premise are similar, but the effect changes depending if you are approching from the side, between the spheres (left image) or the front (right image). Let's image the charged object is the tip of the arrow in the drawing, and it's small enough to be considered a point

In either case, the electron cloud in the spheres will be affected by the electric field generated by the charge, and gets attracted towards it (since the charge is positive and the electrons have by definition negative charge), moving according to the blue lines. For as long as the charge is in place, the "grouping" of charges on one side and the absence of charges on the other will create an electric dipole with the positive charge away from the side the arrived and the negative on the opposite end of the diameter.

The interesting part happens the moment you split the two spheres.

In the left case will realign based on the field lines (remember that a single charge will generate a radial field) and the moment you remove the charge the electrons are no longer drawn to one end, and will eventually re-distribute on the whole sphere, canceling the dipole.

In the right case instead, the fact that the spheres were touching allows the electrons in one of the sphere to migrate to the other, generating a net positive charge in the far sphere, and a net negative charge in the close one. if you separate the two spheres before removing the charge, the electrons are still "trapped" in the leftmost sphere, thus keeping it charged even after the original source is removed from the system.

Answer:

Mercury<Venus<Earth<Mars<Jupiter< Saturn< Uranus<Neptune

Answer: The answer is C

Explanation: I took the test and got it right

Answer:

(a) parallel circuit

(b) (i) ammeter (ii) current

Hope this helps!

Question :-

Answer :-

Explanation :-

As per the provided information in the given question, we have been given that the Mass of the body is 2 kg . Speed of the body is given [tex] \bf{10 \: {ms}^{ - 1} } [/tex] . And, we have been asked to calculate the Kinetic Energy .

For calculating the Kinetic Energy , we will use the Formula :-

[tex] \bigstar \: \: \boxed{ \sf{ \: Kinetic \: Energy \: = \: \dfrac{1}{2} \: \times \: {mv}^{2} \: }} \\ [/tex]

Where ,

Therefore , by Substituting the given values in the above Formula :-

[tex] \longmapsto \: \: \sf{ Kinetic \: Energy \: = \: \dfrac{1}{2} \: \times \: {m \: \times \: v}^{2} } \\ [/tex]

[tex] \longmapsto \: \: \sf{Kinetic \: Energy \: = \: \dfrac{1}{2} \: \times \: 2 \: \times \: {10}^{2} } \\ [/tex]

[tex] \longmapsto \: \: \sf{Kinetic \: Energy \: = \: \dfrac{1}{2} \: \times \: 2 \: \times \: 100 } \\ [/tex]

[tex] \longmapsto \: \: \sf{Kinetic \: Energy \: = \: \dfrac{1 \: \times \: 2 \: \times \: 100}{2}} \\ [/tex]

[tex] \longmapsto \: \: {\textbf {\textsf {Kinetic \: Energy \: = \: 100 \: Joule }}} [/tex]

[tex] \underline {\rule {180pt} {4pt}} [/tex]

The kinetic energy of the body with the given value of mass travelling at the given speed is 100 Joules.

Kinetic energy is simply a form of energy a particle or object possesses due to its motion.

It is expressed as;

K = (1/2)mv²

Where m is mass of the object and v is its velocity.

Given the data in the question;

We substitute our given values into the above expression to determine the kinetic energy of the body.

K = (1/2)mv²

K = (1/2) × 2kg × (10ms⁻¹)²

K = 0.5 × 2kg × 100m²s⁻¹
K = 100kgm²s⁻¹

K = 100J

Therefore, the kinetic energy of the body with the given value of mass travelling at the given speed is 100 Joules.

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Answer:

A

Explanation:

half life is the time taken for a radioactive isotopes to dissociate

Answer:

X: convex Y: Concave

Explanation:

Just got it right

Answer: The equation that relates wavelength and frequency for electromagnetic waves is: λν=c where λ is the wavelength, ν is the frequency and c is the speed of light.

10/0.5=20 meter.

Explanation:

The speed of a wave has a wavelength of 0.5 m/s and a frequency of 2 hz is   0.25 m.

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave.

Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave.

Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a Transverse wave.

The relation between velocity, frequency  and wavelength is,

c = λν

Where λ is wavelength, ν is frequency and c is velocity.

Given,

c = 0.5 m/s

ν = 2 hz

λ = ?

Putting all the values in the equation,

0.5 = 2λ

λ = 0.5/2 = 0.25 m

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Answer:

it would be the same because they are equal

No.of primary turns/no.of secondary equal to current in primary /current in secondary therefore 200/120=3.50/C.in secondary =2.1A

The distance from the 2.0 kg mass at which a string should be attached to balance the rod is 0.67 m.

Distance can be defined as the horizontal length between two points.

To calculate the distance at which the string must be attached to balance the rod, we use the formula below.

Formula:

From the question,

Given

Substitute these values into equation 1

Solve for x

Collect like terms

Hence, the distance from the 2.0 kg mass at which a string should be attached to balance the rod is 0.67 m.

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The total distance traveled  is mathematically given as

d=4.5km

Question Parameters:

A compact disc has a radius of 6 cm.

the constant angular speed of 5 rev/s

time 40 min

Generally, the equation for the linear speed   is mathematically given as

v=w*r

Therefore

v=10 pi * 6

v=60pi cm/s

In conclusion, the equation of the distance

distance = v*t

d=60pi * 2400

d=452389.342 cm

d=4.5km

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Answer:

[tex]\huge\boxed{\sf Option \ D.}[/tex]

Explanation:

Potential Energy:

Type of Quantity:

Unit:

Types:

[tex]\rule[225]{225}{2}[/tex]