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It becomes heat. The water will be slightly warmer after the stirring than before.

Just the both vectors

so, the resultant vector is (5+2)i+(3-7)j+(-7+1)k = 7i-4j-6k

now, magnitude is √7²+4²+6² = √49+16+36 = √103.

Now, if there is a vector whosemagnitudeis same as that of vector but the direction is opposite, then it is called negative of the given vector . Forexample, vector is the negative of vector . It is written as = – .

Inphysics, aforceis said to doworkif, when acting, there is adisplacementof the point of application in the direction of the force. For example, when a ball is held above the ground and then dropped, the work done on the ball as it falls is equal to the weight of the ball (a force) multiplied by the distance to the ground (a displacement).The SI unit of work is thejoule(J), which is defined as the work expended by a force of onenewtonthrough a displacement of onemetre.Work is a vector quantity.

Dimensional Formula is defined as the expression of the physical quantiy in terms of its basic unit with proper dimensions.

The dimension of mass, length and time are represented as[M],[L]and[T]respectively.

So in order to write dimensional formula of

1 Work -

Work=Force×DisplacementWork=Force×Displacement

Now keeping unit of force and displacement we get the unit of work.

Work=NmWork=Nm

NowN=kgm/s2N=kgm/s2

So,

Work=kgms2×mWork=kgms2×m

Work=kgm2s−2Work=kgm2s−2

So dimensional formula of work is

Work=ML2T−2

1

Option (3) is correct.

Jointed track is made using lengths of rail, usuallyaround 20 m(66 ft) long (in the UK) and 39 or78 ft(12 or 24 m) long (in North America), bolted together using perforated steel plates known as fishplates (UK) or joint bars (North America

air is the mixture of gases.

4/x +5y = 7

when x = -4/3

then 4/(-4/3) +5y = 7=> -3 + 5y = 7=> 5y = 7+3 = 10=> y = 10/5 = 2

It is the condition of resonancewhereWl= 1/wcw^2= 1/LC

it's wrong

Given:

a = -9.8 m/s2

t = 3.41 s

vi = 0 m/s

Find:

d = ??d = vi*t + 0.5*a*t2d = (0 m/s)*(3.41 s)+ 0.5*(-9.8 m/s2)*(3.41 s)2

d = 0 m+ 0.5*(-9.8 m/s2)*(11.63 s2)

d = -57.0 m

(NOTE: the - sign indicates direction)

F = ma294 N = m × 9.8 m/s²294/9.8 = mm = 30kg

Porcelain objectsarewrapped in paperor straw before packing for transportation to avoid breakage. This is due to the reason thatpaperand straw are fluffy materials. When packed in such materials, the time of impact between variousporcelain objects, in case of an accidental fall or jerk, is very much increased.please like the solution 👍 ✔️

Momentum = mass × velocity = 75 × 2 = 150 kg m/s

momentum=mass× velocity =75×2 =150 kg.m/s

momentum=mass x velocity = 75x2 =150kg m/s

p=m×v75×2. mass into velocity150kgm/s

The right answer of this question is 150kg.m/s

A source of electricity such as cell, battery, power supply, etc.helps to maintaina potential differenceacross a conductor.

ten thousand newton (10000 N)

how

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I want much more clear answer how you got 50,000

Gravitational force = centripetal force G M m / d² = m v² / d v² = G M / d = g R² / d v = R √(g/d)

ω = angular velocity = v / R = √(g/d) T = time period = 2π/ ω = 2 π √(g/d)

36)For this question,

We have the formula,g'= g/(1+h/R)^2

Here g' = acceleration due to gravity at the height

g = 9.8m/s^2

R = radius of earth

h = height

g/g' = (1+h/R)^2

4 = (1+h/R )^2

1+h/R = 2

h/R = 1

h = R

the image is too bluryyyyy.....

x=-3 is the answer of the question

The right answer is x=-3

let the final mixure is water at T°C

heat given by vapor =heat taken by ice

x*540 +x*c (100-T) = 5x*80 + 5x*c* (T-0) wher C is the heat capacity of water=1 cal/gm/°C

so x*240 =6xT

T=40°C

This is because hard water contains sulphates, carbonates or bicarbonates of calcium and magnesium in it in the form of impurities. So these impurities actually distort the boiling point as they lead to increase in bond strength between structure and so to break the bond at boiling point larger temperature is required and as a result it has a higher boiling point. Whereas distilled water is pure H2O, and has nothingotherthan water molecules.

L = Iw

here for a circular ring rotating about its axis

I = MR^2= 1x(0.2)^2= 0.04 kg.m^2

and w = 10 rps = 62.83 rad/s

so, we have

L = 0.4 x 62.83

thus, angular momentum

L = 2.513 kg.m^2/s

Momentum,P is same for both objects.

Let the lighter object be 1Let the heavier object be 2.

RATIO OF THEIR KINETIC ENERGY:= K.E 1/K.E 2= P²/2m1 ÷ P²/2m2P²,P² get cancelled.= 1/2m1÷1/2m2= 2m2/2m12,2 get cancelled.= m2/m1=mass of heavier object/mass of lighter object

We can conclude that the heavy object has more K.E

PROOF:K.E = mv²/2

K.E is directly proportional to the mass.

The heavy object has more mass.So,it has more kinetic energy.

So at the end of month…One, 90% is left;Two, 90% of that 90% (= 81%) is left;Three, 90% of that 81% (= 72.9%) is left; andFour, 90% of that 72.9% (= 65.61%) is left.100% - 65.61% = 34.39% has disintegrated.Algebraically, d(n) = disintegrated percentage after n months = (1 - d(1))^n

modern physics questions it is

B) is the correct answer

a) is the correct answer

D) is the correct answer

Separation of components of air by the process called fractional distillation: In this process, air is liquefiedunder high pressure. Then it is boiled and depending upon the boiling points of fractions (gases), the components are separated.Instead of flow chart I am providing you diagrammatical representation of process-

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According to Newton's third law of motion, action force is equal to reaction but acts on two different bodies and in opposite derections. When a horse pushes the ground, the ground reacts and exerts a force on the horse in the forward direction. The force is able to overcome friction force of the cart and it moves.

F=230Nis a correct answer

Gases have volume elasticity because we can change the volume of gases easily as compare to other States of matter , liquid and solid

Sun is very bright and watching sun with naked is dangerous to your eyes.Watching a full solar eclipse is not dangerous but when it comes to partial solar eclipse only some part of the sun is covered by the moon( We watch sun different from different places since the angle between your eye and the sun is changing but at few places we see it completely covered by moon since the place on Earth, moon and sun are almost making a straight line) and the rays from the uncovered sun will still reach earth and eventually your eye which exactly seeing the sun with naked eyes during normal days. Even though the sun is partially covered the rays are dangerous enough to damage your eyes.

Asolar eclipse occurswhen the moon gets between Earth and the sun, and the moon casts a shadow over Earth. Asolar eclipsecan onlytake placeat the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface.7

Compression:

the action of compressing or being compressed.

the reduction in volume (causing an increase in pressure) of the fuel mixture in an internal combustion engine before ignition.

Rarefaction:

Rarefaction is the reduction of an item's density, the opposite of compression. Like compression, which can travel in waves, rarefaction waves also exist in nature. A common rarefaction wave is the area of low relative pressure following a shock wave.