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F = q1q2/r^2= 2*3*10^ -14/900

0.66*10^-14-20.66*10^-16 coloumb/cm^2

what

Since, P = P0- ρgh = 98 × 103N/m2 P0V0= PV 105[A(500 - H)] = 98 × 103[A(500 - 200)] H = 206 mm Level fall = 206 - 200 = 6 mm Hence, level fall = 6 mm

the three tiny bone in the middle ear are anvil hammer and stirrp

The middleearcontainsthree tiny bones known as the ossicles: malleus, incus, and stapes. The ossicles were given their Latin names for their distinctive shapes; they are also referred to as the hammer, anvil, and stirrup, respectively.

the questions is what is the function but you have written the names of bones

the correct answer is (b) tiny marine algae.

Thunderis the soundcausedbylightning. Depending on the distance from and natureof the lightning, it can range from a sharp, loud crack to a long, low rumble (brontide). The sudden increase in pressure and temperature fromlightningproduces rapid expansionof theair surrounding and within a bolt oflightning.

Every molecule of liquid draws its neighboring molecules towards it, and is itself also drawn towards every neighboring molecule. Only the molecules which are on the surface are not drawn externally. Beyond the surface there are no further molecules, hence obviously there is no question of being pulled by other molecules in the outward direction. Result: Every molecule on the surface faces equal pull inward. It is as if the common center in the liquid is exerting equal pull on each of the molecules and drawing them towards it. Thus, liquid naturally takes spherical shape and a droplet is formed.

Surface tension is responsible for theshapeof liquiddroplets. Although easily deformed,dropletsofwatertend to be pulled into aspherical shapeby the cohesive forces of the surface layer. In the absence of other forces, including gravity,dropsof virtually all liquids would be approximatelyspherical.

These are called the states of matter. Matter can change from one state to another if heated or cooled. If ice (a solid) is heated it changes to water (a liquid). This change is called MELTING. If water is heated, it changes to steam (a gas).

option a) Highest range is 45° and shortest is 15° in range it is one of the important note

Given the Velocity is 40√2

so ux = vcos(45) = 40 m/s

and uy = vsin(45) = 40 m/s

now, in 2 seconds

the displacement in x is = ux*t = 40*2 = 80m

and velocity will be same = 40m/s

the displacement in y will be given by s = 40*(2) -1/2*(10)*(2)² = 80-20 = 60m

and velocity after 2 seconds will be Vy = uy-gt =40-(10*2) = 20m/s

so, the net velocity is √40²+20² = 44.72 m/s

and displacement is √80²+60² = 100m

PE/KE = ¼ - given

4PE = KE

So let at height h' PE and KE are in the ratio 4:1

So for h' : PE/4 = KE

PE + KE = constant

(PE)h+ (KE)h= (PE)h'+ (KE)h'

(PE)h+ (4PE )h= (PE)h'+ ( PE/4)h'

(5PE)h= (5/4PE)h'

5mgh = 5/4 mgh'

h' = 4h

Object distance, u = -1 cmmagnification, m= 2we know, m = -v/u ⇒ v = -mu ⇒ v = -(1)(-2) = 2 cmso image distance= 2 cmnow, by mirror formula , 1/v + 1/u = 1/f⇒ 1/2 + 1/--1 = 1/f⇒ -1+2/-2 = 1/f⇒ 1/f = 1/+2∴ focal length = -2.0 cmonly a concave mirror can form magnified images.since the image is formed behind the mirror, it is virtual and erect

Armature - It is a rectangular coil which is placed in an uniform magnetic field. The main function of armature is to rotate the shraft or axel to which it is attachedBrushes - They are attached (not fixed) to the split rings.The main work of these brushes is to transport current from external circuit to the internal circuitSplit rings - They are also known as commutator. The work of split ring ring is to change the direction of current and which leads the rotation of the armature in the same direction.

The function of the following parts of an electric motor there are split ring

25 is the correct answer of the given question

The answer for this question is35 m.

Initially the velocity is 20root(2)ms-1& the angle is 45. Vertical component of velocity = 20ms-1

After 1 s, It will cover a distance of s = ut+1/2at2= (20)(1)+1/2(-10)(1)2= 20 - 5 = 15m and its vertical velocity comp. will be reduced to 10ms-1.

Soon After it s mass gets reduced to m from 2m due to reaking so according to the law of conser. of center of mass, it velocitys vertical comp. will be doubled. =10ms-1.*2 =20ms-1

Now for coming to rest it has to cover diatnce v2= u2-2gs=> 400/20=s = 20m

So the total height achieved by the the ball is 20+15 = 35 m

A Cricketer moves his hands backwards during catching so as to take a longer time to stop the ball,this reduces the chances of injury.According to Newton’s law of motion,Force=Mass*(change in velocity\speed)/timeGreater the time used to stop the ball,lesser the impact of ball on hands and thus less chances of being hurt by ball and get injured.

The wavelength in alongitudinal waveis the distance between two consecutive points that are in phase. The wavelength in alongitudinal waverefers to the distance between two consecutive compressions or between two consecutive rarefactions. Theamplitudeis the maximum displacement from equilibrium.

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

option B should be correct.In frequency modulation (FM), unlike AM, the amplitude of the carrier is kept constant, but its frequency is altered in accordance with variations in the audio signal being sent.

option A

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Bakelite is best insulator hence used in handles of cooking utensils, switch boards, radio, telephone casings etc. whereas Melamine is heat resistant, it is used in various industrial application.

1.K. E will be 9 times as the k.e is directly proportional to square of velocity

1

A geostationary satellite, is a satellite that revolves in the same direction the earth rotates.

There cannot be geostationary satellite at the poles, because, it would have to be at rest, which cannot happen as it would get pulled by the earth’s gravity and eventually crash to the earth’s surface.

In fact, there can not be geo stationary satellite anywhere else, except above the equator.

If the stone is released from the balloon, I would believe that there would be no other external accelerations other than the acceleration due to gravity.

(b) is correct option

option C is the answers. option c doesn't full fill the equation for the SHM

1)Gases that lead to air pollution includecarbon,nitrogenandsulfuroxides. While some of these gases occur naturally, likecarbon dioxidein the expulsion of air from the lungs, the serious polluters come from the burning of fossil fuels:coal, oil and natural gas

collect information about the common" shade giving"

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first tell me what is the benifits of answering questions at scolr

You help in solving the doubts of students which is itself a benefit .

(i) The leaf peel of lower epidermis is taken and cut with a blade.(ii) The cut pieces are transferred into apetridishcontaining water.(iii) Leaf peel is stained with safranine.(iv) Leaf peel after staining (2-3 minutes) is taken with a brush and kept on a clean glass slide.(v) Mount the peel with glycerine and putcoverslipon it.(vi) Remove the excess stain and glycerin with the help of blotting paper.(vii) Observe the slide under the microscope.

Maximum hydrolysis occurs in this caseas both the cation and anion are reactive and react with water to produce H+and OFT ions. The solution is generally neutral but it can be either slightly acidic or slightly alkaline if both the reactions take place with slightly different rates.

A polar bond is one which is formed between atoms when their is a difference in their electronegativity i.e is the atom which is less electronegative acquires partial positive charge and the other acquires partial negative charge. A typical example is a water molecule.

Examples of polar molecules

Examples of polar molecules of materials that are gases under standard conditions are:

Ammonia (NH3)Sulfur Dioxide (SO2)Hydrogen Sulfide (H2S).

Also, Ethanol is polar, since its oxygen molecule draws electrons towards it due to its high electro-negativity, causing a negative charge around itself.

Non-polar molecules

A non-polar molecule is one in which the electrons are distributed more symmetrically and thus does not have an abundance of charges at the opposite sides. The charges all cancel out each other.

Examples of non-polar liquids

Most hydrocarbon liquids are non-polar molecules. Examples include:

TolueneGasoline