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Human activities are the main cause of acid rain. Over the past few decades, humans have released so many different chemicals into the air that they have changed the mix of gases in the atmosphere. Power plants release the majority of sulfur dioxide and much of the nitrogen oxides when they burnfossil fuels, such as coal, to produce electricity. In addition, theexhaustfrom cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air. These pollutants cause acid rain.

It is quite difficult to push a box full of books as compared to the empty box since the mass of the book is quite large.

Therefore it induces frictional force and causes problems for the people. Empty box is devoid of mass; hence the reactionary force would be less resulting in minimum effort from the individual.

When you push there is one component of force that adds to the weight of the body and hence there is more friction. When you pull the vertical component of force is against the weight of body and hence there is less overall friction. So it is easy to pull than push an object.

In electromagnetism, displacement current is a quantity appearing in Maxwell's equations that is defined in terms of the rate of change of electric displacement field. Displacement current has the units of electric current density, and it has an associated magnetic field just as actual currents do.

Conduction current & displacement current. Conduction current is the electric current which exists in a conductor when the electrons flow in the conductor at a uniform rate. So, it is the current in a conductor when the electric field remains constant with respect to time.

Displacement current has the units of electric current density,and it has an associated magnetic field just as actual current s do

displacement current is the product of eo & change of electric flux with respect to time

SI unit of displacement current is " ampere "

For a planet to retain its atmosphere, the planet must be heavy enough to hold the molecules making up the atmosphere down. It means that it needs to have adequate gravitational attraction acting on the molecules so that they don’t escape away. You may ask why the molecules even try to escape? That’s mainly because the Sun heats them up, increasing their kinetic energy. They start moving around more and more rapidly as the temperature goes up, creating a pressure which opposes the gravity. This is pretty much a battle between gravity and heat. Now let’s look at under which circumstances one beats the other.

Thecenter of gravityofEarth liesat thecenterofEarth.

Its because at that point, the mass of theEarthis equally distributed in all the directions, thus pulling equally in all directions.

Hence the net pull is zero.

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Because gravity on earth pull the gases towards it, atmosphere on earth is like a blanket on the surface, this is not possible on moon because of its low gravity.

ans is b. the ions of sodium and chlorine. goes in water.

option b is the correct answer

B is the correct answer (the particles of salt get into the spaces between particles of water)

From work energy theorem, since change in Kinetic energy is zero, the total work done by all forces must be equal to zero.

That means, WF+ Wg= 0

WF= –Wg= mgL(1 – cos theta)

The principle ofworkand kineticenergy(also known as thework-energy theorem)statesthat theworkdone by the sum of all forces acting on a particle equals the change in the kineticenergyof the particle.

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This force vector has a magnitude of 200N at 30 degrees to the Horizontal. This vectorhas two components, one horizontal and one vertical. The horizontal component of the force vectoris thevector projectedon the horizontalx axis and the vertical component is the projection of the vector on the vertical y axis. The 200N force is the resultant of the two components. therefore in a right angle triangle

The horizontal component can be found from cos 30 = x / 200x = horizontal component of the force,

x= 200 cos 30 = 200 × (√3/2) = 100√3N

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minimum because the diameter is variable due to this

Triangle law of vector additionstates that when twovectorsare represented by two sides of atrianglein magnitude and direction taken in same order then third side of thattrianglerepresents in magnitude and direction the resultant of thevectors.

A current carrying wire behaves like a magnet.

To locate a current carrying wire conceled in the wall we just need to move a magnetic compass on the wall since their will be magnetic feild produced by a current carrying conductor and because of that magnetic feild the compass neddle gets deflected from it actual north south direction .so the region on the wall within which deflection of compass neddle is noticed is the place where the current carrying wire is located.

B= (µₒI)/2πa

here, I = 3 A and a = 15 cm = 15 * 10^-2 m and the value of µₒ is 4π * 10 ^-7

so, B = [4π*(10)^-7 (3)] / [2π(15*(10)^-2)]cancelling 4π by 2π, we get,B = [2*(10)^-7*(3)] / [15*(10)^-2]B = [6*(10)^-7] / [1.5*(10)^-1]B = 4*10^-6T

Ans:- Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways. Alpha particles are named after the first letter in the Greek alphabet, α

This is an activity that varies from individual to individual and needs to be performed yourself.

The basic properties of sound are: pitch, loudness and tone. Pitch and loudness of sound. Sound B has a lower pitch (lower frequency) than Sound A and is softer (smaller amplitude) than Sound C. The frequency of a sound wave is what your ear understands as pitch

There are four universal or fundamental forces in nature. Without these forces, all matter in the world will fall apart. Force as such is any pull or push that causes an object to alter its physical state (in terms of motion or deformity). Newton defined a force as anything that causes an object of mass ‘m’ to move with an acceleration ‘a’. A brief overview of the four fundamental forces is given below:

1)Gravitational force - Gravitational force is the force responsible for holding planets in their orbits and this is possible only because of their infinitely long range.

2)Electromagnetic force - These have a long range and the effect of their forces diminishes over distance due to shielding effect.

3)Strong nuclear force - Strong nuclear forces are responsible for holding the nuclei of atoms together.

4)Weak nuclear force - Weak nuclear forces are responsible for the radioactive decay, specifically the beta decay neutrino interactions.

The answer is Option B.

work done in isothermal process is = nRTln(V2/v1)

and since volume is halved

so, work done will be = nRTln(1/2) = -nRTln2

option 4

Charging by Induction:-

1. No physical contact.

2. No exchange of charge.

Charging by conduction:-

1.Two objects must be inphysical contact.

2.Transferof charge takes place.

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A luminous object is one that gives off light. In other words, it glows (or shines) of its own accord. To be able to glow, the object must have its own source of energy.

Some examples of luminous objects are a burning candle, a light bulb, the sun and other stars, fluorescent materials and tube lights, among other things. Fluorescent materials store energy given by other luminous objects and release light in wavelengths that cannot be seen in visible light.

Quantum Physics is a branch of physics which describes the nature at smallest scales of energy levels of atoms and subatomic particles. It is necessary to understand the properties of solids, atoms, nuclei, subatomic particles and light.

In contrast toinduction, where thechargedobject is brought near but never contacted to the object beingcharged,conduction charginginvolves making the physical connection of thechargedobject to the neutral object. Becausecharging by conductioninvolves contact, it is often calledchargingby contact.

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a is the best answer

a is the best answer

( a ) समुद्र की गहराई

samunder ki hight mapne ke liye

a is in the answer....

a best answer bhai please like and share

Option (c) Current: AmpereThis indicates units.

C part is a right answer

the position of object for which the image will be half the size of the object is -20 cm

It’s usually assumed that the mechanism of heating in re­entry is by friction(i.e. viscous drag in the atmosphere). In fact this is the predominant mechanism only at lower altitudes, as air density increases. During thefastest and hottest part of the descent, less familiar physics is in play. A re­entering vehicle develops a very energetic pressure wave at its leadingsurfaces. The energy density is sufficient to cause atmospheric moleculesto dissociate, and their component atoms to become ionized. The vehiclethus descends in a superheated shroud of incandescent plasma.

its due to speed and atmosphere they combine and generate heat

Consider a resistor of Resistance R. Let the current flowing through the resistor be I and potential difference across its ends be V.In time t, let Q amount of charge flows through the resistor.

Work done on Moving charge will be,W =V x Q ---------(1).

According to the definition of electric current,Q = I x t -----------(2).

Putting equation (2) in (1),W = V x I x t.And the work done is dissipated as heat.Therefore,Heat produced, H=W=V x I x t => VIt.H= VIt.According to Ohm's law V= IR.Putting this in equation(2), we get,H= IR x It.Therefore, Heat= I^2)Rt.

Hence heat produced in heater when heat=i^2rt=15*15*10*2*60*60=16,200,000Jouled