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B is the correct answer for this question

An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies after the encounter is equal to their total kinetic energy before the encounter.

Reading will be 125Vas these are having same resistance so voltage drop will be same125+125= 250 volt

Given, power of pump = 2kW =2000W

Time (t)= 60sec

Height (h) = 20m

g = 10m/s2

As you know, power =work done per unit time.

Work done = mgh = m ×10×20 =200m

Therefore, 2000W = 200m/60s

Therefore, m = 600kg

So, the pump can raise 600 kg of water in one minute.

Work done by heart = 2*60Number of heart beats= work done/ power in each heart beat= (2*60)/1.5= 80.

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Thefrequencyof100 hertzmeans that thesource of sound vibrates 100 timesin1second. Hence, thesource of sound vibrates6000timesin aminute.

Given that,

r = 12cm = 0.12m

1. Angular speed = 7 revolution in 100s (since, 1 revolution = 2*3.14*r)

= 7*(2*3.14*0.12)/(100)

= 0.053 rad/s

Linear speed, v = Angular speed *radius

=> v = 0.053*0.12 = 6.3*10^-3m/s =0.63 cm/s

2. Value of acceleration is constant here and always acts towards the center.

It is given by

a = v^2/r = 0.033 cm/s^2.

Given v = a √x x = 0 when t = 0

v = dx / dt = a √x=> dx/√x = a dt integrate on both sides=> 2 √x = a t + c x = 0 at t = 0 => c = 0

=> x = a²t²/4 (differentiate now: wrt t)=> v = a² t /2 (differentiate now wrt t)

=> acceleration = a² / 2

hence, option (b) is correct

part 2

A car travels 100m due east and 25m due west.a) what is the distance covered by the car :

Distance is the total path covered by the object.hence distance travelled=100+25=125mb)what is its displacement?

Displacement is the shortest path between source and destination.Car moves 100m forward(east) and then 25m backward(west)so displacement=100-25=75m

a car covered 125 m distance and displacement is 75m

a car covered 125m distance and displacement is 75m

total distance covered by car = 100+25 = 125m displacement = 100-25 = 75m

a) the distance covered by the car is 125m & b) it's displacement is 75

distance =125 mdisplacement=75 m is the correct answer of the given question

a car coverd 125m distance and displacement is 75m

A car covered 125m distance and displacement is 75 m

distance=125m displacement=75m is answer to your question

a car covered 125m distance b

Using relationv = u + atv = final velocityu = initial velocitya = accelerationt = time taken

Hence,v = 0 + 4*4v = 16

Therefore,Final velocity after 4 sec is 16 m/s

A cation is an ion or group of ions possessing a positive charge and having the natural ability to move toward the negative electrode in electrolysis.

and please ...define anion

An ion with net negative charge, having more electrons than protons. In electrolysis, anions migrate to a positively charged anode.

Option 4 is wrong since A X B is C and C cannot be perpendicular to itself.

Area of the circle swept by the windmill =A

Velocity of the wind =v

Density of air =ρ

Volume of the wind flowing through the windmill per sec =Av

Mass ofthe wind flowing through the windmill per sec =ρAv

Massm, of the wind flowing through the windmill in timet=ρAvt

K.E =1/2*(m)*(v²) = 1/2*(ρAvt)(v²) = 1/2ρAv³t

power = energy/time = 1/2ρAv³t/t = 1/2ρAv³

option A

We are given displacement-time relation : s = (1/3) × t² Differentiating it wrt time t ; we get velocity - time relation :-v = (2/3)×t again differentiating above wrt time t ; we get acceleration of body :-a = 2/3 m/s² Now ;Force = mass × acceleration = 3× (2/3) = 2 Nusing displacement-time relation and putting the t = 2 ; we get the displacement the body covers in 2 seconds .s = (1/3) (2)²s = 4/3 m______________________Now work done = 2 × 4/3= 8/3 J

thanku

please tell me which book claer my concept clearly for such tough problem

Vertebrate. ... belonging or pertaining to theVertebrata(or Craniata), a subphylum of chordate animals, comprising those having a brain enclosed in a skull or cranium and a segmented spinal column; a major taxonomic group that includes mammals, birds, reptiles, amphibians, and fishes.

Wesprinklepowder on carrom boardto make the surface of the boardsmooth. This reduces the friction between the surface of thecarrom board, the striker and the coins. As a result, the coins and the strikercanmove easily on the carrom board.

Force=mass*accelerationmass=10/2=5kg

Question 11 Force=mass×acceleration 10 =mass×2mass = 10/2 =5 kg ans

Question 12 mass of ball =200g=0.2kgacceleration = 3m/s*s Force = mass × acceleration = 0.2*3 = 0.6N ans

option (1) 8 N is the correct answer

vectors can be split into 3 component along the 3 Axis as x-component , y-component and z-component

An el­ectric motor is all about magnets and magnetism: A motor usesmagnetsto create motion. If you have ever played with magnets you know about the fundamental law of all magnets: Opposites attract and likes repel. So if you have two bar magnets with their ends marked "north" and "south," then the north end of one magnet will attract the south end of the other. On the other hand, the north end of one magnet will repel the north end of the other (and similarly, south will repel south). Inside an electric motor, these attracting and repelling forces createrotational motion. ­

Abrushis a device which conducts current between stationary wires and moving parts, most commonly in a rotating shaft. Typical applications include electricmotors, alternators and electric generators.

The Role of spit rings is to provide a path for the current provided to the motor to energize the armature windings of the rotor, in order to create a magnetic field to oppose that of the field windings of the stator. The more current in the windings, the stronger the magnetic field, the more torque on the shaft, so you want as much conductivity in your split rings, commutator and brushes as your motor can handle the current to provide the intended torque.

Ans :- Fleming's Left Hand Rule is used to determine the direction of force on a current carrying conductor placed in magnetic field.

It states that stretch the thumb, the forefinger and the middle finger of the left hand so that they are perpendicular to each other. The forefinger points in the magnetic field, the middle finger in the direction of the current and the thumb in the direction of force exerted on conductor.

Fleming's left-hand rule is used for electric motors, while Fleming's right-hand rule is used for electric generators. ... In an electric motor, the electric current and magnetic field exist (which are the causes), and they lead to the force that creates the motion (which is the effect), and so the left hand rule is used.

Do a force diagram around the center of gravity of your body. In both cases you have the same amount of force in the vertical direction, but in the one bucket scenario you have a lot of force in the horizontal direction.With one bucket you are constantly leaning in the other direction so that the downward force is exerting directly on your center of gravity. This keeps you from tipping over.

mam but in the question they have asked how far and not how fast....

Mass = 60 kgK.E = 750 Jv = ?

K.E = (1/2)mv^2

750 = (1/2) × 60 × v^2v^2 = 150/6v = √25v = 5 m/s____________________Hence the man should run with a velocity of 5m/s.

The temperatureTin degrees Celsius (°C) is equal to the temperatureTin degrees Fahrenheit (°F) minus 32, times 5/9:

T(°C)= (T(°F)- 32) × 5/9 = (100°F - 32) × 5/9 = 37.778°C

So 100 degrees Fahrenheit are equal to 37.778 degrees Celsius:

100°F = 37.778°C

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Water pollution is the contamination of water bodies (like oceans, seas, lakes, rivers, aquifers and groundwater) usually caused due to human activities. Water pollution is any change in the physical, chemical or biological properties of water that will have a detrimental consequence o any living organism. Due to its liquid form and availability in river, ponds, river, it get polluted easily

The value of cross product of vector is

|A×B| = |A|•|B|sin∅

Reading of screw gauge= MSR + VSR × LC + zero error= 0.5cm + 25 × 0.001cm + 0.004cm= 0.529cm

Reflectioninvolves a change in direction of waves when they bounce off a barrier.Refractionof waves involves a change in the direction of waves as they pass from one medium to another.Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.

These colors are often observed as light passes through a triangular prism. Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion

Theresistance-change factor per degree Celsius oftemperaturechange is called thetemperature coefficient of resistance.

Definition :

Theresistance-change factor per degree Celsius oftemperaturechange is called thetemperature coefficient of resistance. This factor is represented by the Greek lower-case letter “alpha” (α). A positivecoefficientfor a materialmeansthat itsresistance increases with an increase in temperature.