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just replace the no. of revolutions as per the ques.

0.001.

thanks

draw an angle <PQR equals to <ABC

It is a solid sphere

Object position: At C ( Centre of curvature)Object distance = 40 cmPosition of the image: at infinity because the focal length of the mirror is 20 cm.If the object is moved 20 cm towards the mirror then its new position would be at the focus of the mirror.

No, when a beam of light passes through a prism, there is no spectrum.

Actually, spectrum is produced by the deviation of different colors due to the refraction of light.

When a white light passes through the hollow prism, it escapes out as it entered because no refraction takes place.

A glass prism is a transparent object having two triangular ends and three rectangular sides. The refraction of light in glass prism is different from a glass slab. This is because in glass prism, the incident ray of light is not parallel to emergent ray of light.

When a ray of light enters the glass prism it gets deviated two times. First when it enters the glass prism and second when it comes out of the prism. This is because the refracting surfaces of the prism are not parallel to each other. Also, when the ray of light passes through the prism it bends towards its base.

Dispersion of light

In 1665, Isaac Newton discovered that white light consists of seven colours. He found that if a beam of white light is passed through glass prism then it will split in to seven colours. These colours are red, orange, yellow, green, blue, indigo and violet (VIBGYOR).

Spectrum of white light: The band of seven colours formed when a beam of white light is passes through a glass prism is called spectrum of white light.

Dispersion of light: The splitting of white light into seven colours on passing through a transparent medium is called dispersion of light.

The dispersion of white light happens because the angle of refraction of lights of different colours is different while passing through the transparent medium. For example, red colour deviates least and is formed at the upper part of the spectrum and violet colour is deviated maximum and is formed at the bottom of the spectrum.

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Escape velocity is the speed that an object needs to be traveling to break free of a planet or moon's gravity well and leave it without further propulsion. For example, a spacecraft leaving the surface of Earth needs to be going 7 miles per second, or nearly 25,000 miles per hour to leave without falling back to the surface or falling into orbit.

object should be placed at the centre of curvature

XY is the lateral shift.

Then the angle of reflection will also change according to angle of incidence ....because according to law of reflection : angle of incidence = angle of reflection

There is some information missing in the question 18. The angle of deviation of the prism is essential to compute the angle of emergence.

i think the correct answer is 8N pls inform me whether i am right or not

displacement by a whole circle = 2πR displacement by the half circle = 2πR/2= πR

displacement by whole circle= 2ΠRdisplacement by half circle =2ΠR/2=ΠR

answer is r root pi2 +4

The phenomenon of reflection of sound from a surface is called echo. So, to hear distinct echo the minimum distance between the source of sound and the reflector must be 17 m. Which is way larger than the size of a normal room. This is why echo is not heard within a room of all dimensions.

A DISC REVOLVES IN A HORIZONTAL . SO THE ANSWER IS 3

There is a basicdifference, becausemassis the actual amount of material containedin abody and is measured in kg, gm, etc. Whereasweightis the force exerted by the gravity on thatobjectmg. Note thatmassis independent of everything butweightis different on the earth, moon, etc

PotentialEnergy(static energy) isthe storedenergy in anobject or system because of its position or configuration.Kinetic energyof an objectisrelative to other moving and stationary objects in its immediate environment. .Kinetic energycan be transferred from one moving object to another, say, in collisions.

Newton first lawstates that object stays in fixed state, unless external forceisapplied.Newton third lawstates that: if thereisaction then there will be opposite & equal reaction.

Newton's third law of motion is below

5 k^ and magnitude is 5

oo sorry my mistake.. i have done it wrong.. below is correct solution. sorry for inconvenience

(c ) [(mgR) / (LV)] is correct.

Force exerted by spring =ky0. As weight is divided between two spring,

2(ky0) = weight = mg

∴ky0= (mg /2)(1)

alsoI = (V/R)(2)

Fm= magnetic force on the rod = BIℓ

from (2) Fm= [(BLV) / R](3)

When field is ON, spring are observed to extend further.

∴mg + Fm= 4ky0

Fm= 4ky02ky0from(1)

Fm= 2ky0

from (3)

[(BLV) / R] = 2ky0

∴B = [(2ky0R) / (LV)]

from (1) putting 2ky0= mg

∴B = [(mgR) / LV]

no the ans is option 2

Since, the radius is 1.64 mm

i.e. r = 1.64 x 10-6m

As we know, m=∂*v

(where∂ is density and v is volume)

therefore, m = 0.851 x 4/3-pi-r3

= 1.45 x 10-17kg

We have already studued that qE= mg

q=mg/E

=1.45 x 10-17 x9.8/1.92x 105

= 7.4 x 10-22C .

force = charge * electric field

Here the force acting on the drop is the weight pulling it downwards.

Weight = 1.6*10^-14N

Charge on the drop is 3.2*10^-19C

Hence electric field = (1.6/3.2) * 10^5N/C

= 5*10^4N/C

The gravitational force on the oil drop = mg = 3 x 10^-16x 10 = 3 x 10^-15N.

Magnitude of the electrostatic force needed balance this force is given by

E = mg/10e = (3 x 10^-15) / (10 x 1.6 x 10^-19) = 0.1875 x 10^4V/m.

Voltage across the places of the capacitor is then given by

V = Ed = 0.1875 x 10^4x 5 x 10^-3= 9.375 Volts.

emf = BLv

and i = BLv/R

also, F = BLi = B²L²v/R

Note : you can also, do this question by checking the dimension of the options.. and matching it with dimension of F

we know that in this case

y =2r

where 'r' is the radius of the circular path of the charged particle

now, we know that

F = mv2/r = qvB

or

r = mv/ qB

or

r =v/ [(q/m).B]

we know that a = q/m , so

r =v/ aB

also, in scalar form

v = v0

B = B0

so,

r = v0/ aB0

thus,

y = 2r

or

y = 2v0/ aB0

hence, Correct answer: 2* v not / B not * aoption (c)