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Answer:

The REFRACTIVE index is the RATION between seed of in vacuum to the speed of LIGHT in medium.

The refractive index of water for light going from air to water is 1.33.

So the refractive index for beam of light going from water to air will be the INVERSE of 1.33.

n = 1/ 1.33

n = 0.75

Thus the refractive index will be 0.75

Explanation:

Answer:

The equation for conservation of MOMENTUM looks like this: TOTAL momentum before = total momentum after. pbefore = pafter. (M1V1 + m2v2)before = (m1v1 + m2v2)after.

Explanation:

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Answer:

Inertia of REST: A body which is rest continues to be in rest unless acted upon by an external force. ... Inertia of MOTION: A body in motion in a specific DIRECTION continues to be in motion in that direction unless acted upon by an external force to CHANGE the direction.

As, the displacement is ZERO the work will be zero.

explanation

A CONSERVATIVE force depends only on the POSITION of the object.

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ANSWER:

I THINK the answer was TURNED because tur-0.6666.........

Sorry but i am not a science student

EXPLANATION:

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ANSWER:

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Explanation:

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Answer:

The optical fibre is a device which WORKS on the principle of total INTERNAL reflection by which light signals can be TRANSMITTED from one place to another with a negligible LOSS of energy.

ANSWER:

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Explanation:

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ANSWER:

u=15m/s

v=30m/s

then v=u+at

v=15+a

30=15+a

a=15 ANS.

Answer:

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No the Needle is the south ploe of a MAGNET present in the compass

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ANSWER:

I don't have it RIGHT it now

ANSWER:

The given question is solved

Explanation:

Note that the potential difference between Band E, and C and D are EQUAL since they are connected in PARALLEL(in my drawn FIGURE)

Answer:

An OPTICAL fibre is a cylindrical dielectric waveguide ( nonconducting waveguide) that transmits light ALONG its axis, by the process of TOTAL INTERNAL REFLECTION .

1. motion of swing - Translatory and oscillatory motion

2.motion of bullet fired from a gun - RECTILINEAR motion

3. potter's wheel - ROTATORY motion

4. saw of a carpenter - periodic motion

5. falling feathers - RANDOM motion

Answer:

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ANSWER:

A bullet of MASS 50 g is moving with a VELOCITY of 500 ms

−1

. it penetrates 10 cm into a still target and comes to rest.Calculate

(a) The kinetic energy possessed by the bullet,

(b) The AVERAGE retarding force offered by the target.

Answer:

If bar MAGNET is falling VERTICALLY through the hollow region of long vertical copper TUBE then the magnetic flux linked with the copper tube (due to 'non-uniform' magnetic field of magnet) changes and eddy CURRENTS are generated in the body of the tube by Lenz's law the eddy currents opposes the falling of the magnet ...

ANSWER:

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Explanation:

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ANSWER:

Explanation:

Rays of light PARALLEL to the principal AXIS of a concave mirror will appear to converge on a point in front of the mirror somewhere between the mirror's pole and its center of curvature. That makes this a converging mirror and the point where the rays converge is CALLED the FOCAL point or focus

ANSWER:

FINAL velocity

Explanation:

MOTIONS FIRST EQUATION  v=u+at

v-final velocity

u-initial velocity

a-acceleration

t-time

ANSWER:

According to Pacific Lamp Supply Company, the most common reason that lightbulbs can EXPLODE is if the MANUFACTURERS don't PUT enough insulation at the base of the bulb. This causes the base to melt, and the gas that is stored in the light bulb will leak out.

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ANSWER:

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Explanation:

Let us consider an object which is projected vertically upwards with initial velocity  u which reaches a maximum height h.

Acceleration due to gravity=-g

Equation of Motion for a body projected thrown upwards :

V=u-gt----------(1)

h=ut-1/2gt² -----------(2)

v²-u²=-2gh --------(3)

Equations of motion for freely falling body :

for free fall : 

Initial velocity=u=0

g=g

V=gt----------(4)

h=1/2gt²-------(5)

v²=2gh------(6)

Time of Ascent is the time taken by body thrown up to reach maximum height h 

At maximum height , V=0

Equation (1) turns to u=gt1

t1=u/g  ----------(7)

Maximm height h=u²/2g ----------(8)

Time of descent : After reaching maximum height , the body begins to travel downward LIKE free fall

so equation (5) h=1/2gt₂²

t₂²=2h/g

t₂=√2h/g

but from equation (9)

t₂=√2xu²/2g²

t₂=u/g -----------------equation (10)

∴t₁=t₂

The time ascent is equal to time of descent in CASE of BODIES moving under gravity.

ANSWER:

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ANSWER: Hello! Hope this helps you:D

An electric current is the rate of flow of electric CHARGE past a POINT or region.

unit of electric current is the ampere

Pot life is the time from mixing the two packs TOGETHER to the point at which the mixed PAINT is no longer useable. It is also known as the working time or useable life.

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Answer:

NEWTON's SECOND law. The second law states that the rate of change of momentum of a body is DIRECTLY proportional to the force applied, and this change in momentum takes PLACE in the direction of the applied force. The second law can also be stated in terms of an object's acceleration.

ANSWER:

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ANSWER:

a CAR MOVING....

EXPLANATION:

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ANSWER:

NORMAL to the PAPER,INWARDS

ANSWER:

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ANSWER:

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ANSWER:

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Answer:

We USE →B to denote a MAGNETIC field and arrows on field lines to show the direction of the magnetic field. Note that if there is no CURRENT there will be no magnetic field. The direction of the current in the CONDUCTOR (wire) is shown by the central arrow

Explanation:

Answer:

The Tyndall effect is LIGHT scattering by particles in a colloid or in a very fine suspension. ALSO KNOWN as Willis–Tyndall scattering, it is similar to Rayleigh scattering, in that the intensity of ...

Explanation:

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ANSWER:

m/s is the CORRECT answer

Answer:

Knowing that body temperature is influenced by the MEASUREMENT site, we calculated average temperatures, in DECREASING ORDER, rectal at 37.04°C, tympanic at 36.64°C, URINE at 36.61°C, oral at 36.57°C, and AXILLARY at 35.97°C.

Explanation:

ANSWER:

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ANSWER:

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Answer

• Distance = 14 km
• Displacement = 10 km

Given

• A person MOVES 8 km in a straight line towards EAST and then move 6 km to the south

To FIND

• Distance
• Displacement

Diagram

-  -  -  -  -  -  -  -  -  -  -  -  -  - >     ( 8 km )

                                          |

                                          |

                                          |

                                          ^    ( 6 km )

                                          |

                                          |

                                          |

Concept Used

Distance : It is defined as how much ground occupied by an object

Displacement : It is defined as the shortest distance b/w two points i.e., initial and final points .

Solution

Distance = 8 kn towards east + 6 km towards south

⇒ Distance = 8 km + 6 km

⇒ Distance , D = 14 km

From diagram ,

Displacement will be find by using PYTHAGORAS theorem .

LET displacement be d .

⇒ d² = 8² + 6²

⇒ d² = 64 + 36

⇒ d² = 100

⇒ d = 10 km

So ,

Distance , D = 14 km

Displacement , d = 10 km

ANSWER:

Her FALL was BROKEN by the SLUDGE pond

Explanation:

She did not hit the ground abruptly but her descent was slowed gradually.

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Answer:

EXPLANATION:

The electric field due to charge plate with charge density (σ) is GIVEN by,

E = σ/2ϵ₀

Now the force between charge plate and charge Q is,

F = qE

substituting the value of E in the equation,

F = qσ/2ϵ₀

Here,

• q = -31 C

• σ = 5×10¹⁰ C m

• ϵ₀ = 8.85 × 10⁻¹² F m⁻1

∴ F = (-31) × {(5×10¹⁰)/(2 × 8.85 × 10⁻¹²)}

⇒ F = -875.706 N

​

ANSWER:

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ANSWER:

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Answer:

Explanation:hii im not sure if its ur answer but i HOPE it helps:)

Let us consider a right circular closed cylinder of radius r and length l, with infinitely LONG line of charge as its axis.

The magnitude of electric FIELD intensity at every point on the curved surface of the cylinder is same, because all such points are at the same distance from the line charge.

Contribution of curved surface of cylinder towards electric flux,

                                 ()

 Where   is the curved surface area of cylinder.

On the ends of the cylinder angle between and is 90. Therefore these ends make no contribution to the electric flux of the cylinder.

E ()

Charge enclosed in the cylinder= linear charge density x length = λl

According to Gauss's theorem

The direction of electric field vector will be the function of whether the line charge is positive or negative

If λ < 0, i.e., in a negatively charged wire, the direction of  is radially inward towards the wire.

If λ > 0, i.e., in a positively charged wire, the direction of  is radially out of the wire.

Answer:

EXPLANATION:

INITIAL VELOCITY(U) = 15m/s

Final Velocity(v) = 30m/s

Average velocity = 15 + 30/2 = 45/2 = 22.5m/s

Accelaration = Δd/Δt = 30-15/t = 15/t.  

ANSWER:

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