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let the initial velocity be u , and retardation is a.so, when velocity is u/2

distance covered is 3kmusing V² = u²-2as => (u/2)² = u² -2a(3)=> 6a = 3u²/4 => a = u²/8

so , now when V = 0the 0 = (u/2)² -2a(s)=> s = u²/8a

but a = u²/8

so, s = (u²/8)/(u²/8) = 1kmoption 1.

we know

g = GM/R²

where g = acceleration due to gravity

G = Gravitational constant

M = mass of earth

R = radius of earth

g = GM/R²

M = gR²/G

M = 9.8 x 6.4 x 10^12 / 6.67 x 10 -11

M = 6.018 x 10^24 kg

refractive index = speed of light in air/speed of light in substance=(3*10^8)/(1.25*10^8)=2.4

The direction of force on a current carrying conductor placed in a magnetic field is determined by Right-hand thumb rule.

(a) is correct option

right hand thumb rule

right hand thumb rule

refractions of light at plane surfaces

1.

The direction of induced current may be found easily by applying either Fleming's Right-hand Rule or Lenz's Law.

Flemings left hand rule

1) for finding the direction of magnetic field. 2) used in electric motor. 3) used in electric gernator.

The right-hand rule is based on the underlying physics that relates magnetic fields and the forces that they exert on moving charges—it just represents an easy way for physicists to remember the directions that things are supposed to point. Occasionally a physicist will accidentally use their left hand, causing them to predict that the magnetic force will point in a direction opposite the true direction

We can find the magnetic field that is caused by moving charges using a second right-hand rule. The magnetic field made by a current in a straight wire curls around the wire in a ring. You can find it by pointing your right thumb in the direction of the current in the wire and curling your fingers. Your fingers will be curled in the same direction as the magnetic field around the wire.

so wrong statement is a)

Faraday's law of induction isa basiclaw of electromagnetismpredicting how a magnetic fieldwillinteract with an electric circuit to produce an electromotive force (EMF)—a phenomenon called electromagneticinduction.hence this law helps in determining the NS of magnet due to the deflection produced in the needle

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option 1 is the correct answer.the nature of the flow will be turbulent.

1) is the right answer of the following

option 1 is correct answer

this not the right answer

on dividing the force co-ordinate , we get acceleration time graph as peak acceleration at t=0. that is 10m/s² . so acceleration is constant till t=5 sec , so , for 1 sec the velocity = at = 10m/s

This is because the ciliary muscles of eyes are unable to contract beyond a certain limit. If the object is placed at a distance less than 25cm from the eye, then the object appears blurred because light rays coming from the object meet beyond the retina.

What about the next question

Let m be the mass for 1 m length chain then 25 cm length the mass would be: = > m/4balacncing the forces we get,f = mg/4.u*(3m/4)*g = mg/4u= 1/3

force= 10Nangle between vertical component and force=30°angle between horizontal component and force= 90°-30°=60°horizontal component of force= Fcos60°=10/2= 5N

Pressure is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area. The basic formula for pressure is F/A (Force per unit area). Unit of pressure is Pascals (Pa). Types of Pressures are Absolute, Atmospheric, Differential, and Gauge Pressure. While sipping beverages from a straw, have you noticed that you actually suck the air out of the straw? While you sip the beverage, you’re actually applying ‘Pressure’.

By its very definition: Pressure = Force/Area. So for a given force if you decrease the area by a factor of two, then the pressure would increase by a factor of two.

The upward force due to the change in pressure in the capillary.F(up)=∆P*A =(2*S.T.*cos(angle of contact)/R)*πR^2 assuming angle of contact to be zero =2*π*R*S.T.=(circumference)*(6*10^(-2)) This F(up)=75*10^(-4) From there you will get Circumference is 12.5*10^(-2)m.

here Kf -ki = work done by all forces

ki = 0 so, Kf = Wgravity + WforceKf = 18*5 -1*10*4 Kf = 90-40 = 50 = 5×10.

n = 5

mg=uNm×10=0.2×10m=0.2kgweight=mg=0.2×10=2N

horizontal force on body = normal reaction force = 10 N

so frictional force = 10 x 0.2 = 2N which just counteracts the weight of the body therefore weight of the body is also 2N

Persistence of vision means that the image is retained by the eyes for a small time after it was originally seen, if it was not there motion pictures and cartoons will be like viewing picture after picture slideshow. This persistence of vision gives the motion picture its smooth flow and make it look like they are moving within the screen

15 m/s = 15*3600/1000 km/h = 54 km/h

15 m/s = 15*3600/1000 km/h = 54 km/h

thank u so much

Ans :-

15×18/5=54 hence ans is 54km/h

option 2

velocity of bird = 40j ( +j along north)

velocity of train is = -40i... ( +i along east)

so, velocity of bird with respect to train = Vb-Vt = 40j-(-40i) = 40j+40i = 40√2 in (+i+j) direction.. means north east direction..

option 2.

a correct answer is (3)

option 3

micro SD card stores all the pictures

sin ( alp) =1/2 alp= 30° cos ( bet) =√3/2bet=30° So, alp+ bet = 60°

option c

1.An athlete2.A scooter3.A bicycle

how

H2 burns with pop sound.

the gas which burn with pop sound is hydrogen gas

4R's

the gas is co2the drastic change in the stage stop of mensuration

sorry my brother did this mistake

thanks