Explore topic-wise InterviewSolutions in .

Eddy currents(also called Foucault'scurrents) are loops of electricalcurrentinduced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction. ... This effect is employed ineddy currentbrakes which are used to stop rotating power tools quickly when they are turned off.

The reading of the spring balance will be sum of the tension in the strings on the either side.

so, for tension firstly we will calculate acceleration as. total force = (60-30) = 30Nmass = (6+3) = 9kg.

so acceleration is = 30/9

now , for tension on 6kg string the equation is 60-T = m*aor T = 60-6*(30/9) = 60-20 = 40N.

tension on 3kg string is 30-T = m(-a)30-T = - 3*(30/9) = -10 or T = 40N

so total T = T+T =80N

the reading is 80N

Thermometer is kept under tongue so that the reading which it gives is true , i.e. true reading of the inner body heat. The intense heat of our body is present under our tongue and so it is used under tongue so that we can measure our whole body temperature . The underside of the tongue has the most bloodflow and is more accurate than any part of the mouth. If thermometer will be in contact with air at the same time , then it will cool down and will result in giving incorrect reading. So it is kept under tongue.

The thermometer is kept in under tongue to know our temperature because under our tongue the temperature is high.

Musical instruments like guitar are provided with a hollow box so that when the strings are set into vibration, forced vibrations are produced in box. Since the box has a large area, it sets a large volume of air into vibration which produces a loud sound of same frequency as that of the string.

PLEASE HIT THE LIKE BUTTON

yes she moves a constant -------------------------------------

she moves with constant velocity

During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other thanredis mostly scattered away. Most of theredlight, which is the least scattered, enters our eyes. Hence, thesunand the skyappear red.

a is Pluto and b is Mars

Duringsunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other thanredis mostly scattered away. Most of theredlight, which is the least scattered, enters our eyes. Hence, thesunand the sky appearred

Let mass or m = 600g, m1 = 300g, heat capacity of water = c. T be the initial temperature and T1 be the final temperature of the liquid.

According to the question,

mc (T1 – T) = m1 c (50 – T1)

600 c (T1 – T) = 300 c (50-T1)

Therefore, initial temperature is equal to 5 degree Celsius.

Total Charge Of the Universe is Constant

=>Sum of +ve & -ve Charges in the Universe is Constant...

Assume that one cup holds 250 ml of water.

250 ml = 250 gram of water since its density is 1 in cgs.

number of moles of water in 250 gram = 250 / molar weight of water

n = 250/18 = 13.88 moles

1 mol has 6.022 x 1023 number of water molecules

So 250 g water will have 13.88 x 6.022 x 1023 number of H2O molecules

= 8.36 x 1024 number of molecules

One molecule of water has 2 hydrogen atoms (2 protons) and one oxygen atom (8 protons).

Total protons = 10 = total electrons (since it is neutral)

So 250 g water will have 10 x 8.36 x 1024 = 8.36 x 1025 protons.

charge of proton = 1.6 x 10-19 C

So total positive charge of 250 g water = 1.6 x 10-19 x 8.36 x 1025 = 13.37 x 106 C

which is equal to 13.3 MC (mega coulomb)

So one cup of water has 13.3 mega coulomb positive and negative charge, so that the overall charge is zero...

It is not clear how to calculate please give me explain clearly

Genes located on different chromosomes will beinherited independentlyof each other.Mendelobserved that, when peas with more than onetraitwere crossed, the progeny did not always match the parents. This is because differenttraits are inherited independently– this is the principle ofindependentassortment.

The specific latent heat of fusion of ice is sufficiently high (336 J g-1) so as to freeze water, a large quantity of heat has to be withdrawn, hence it freezes slowly.

As the temperature of ice is equal or below zero degree Celsius and the temperature of water is always more than zero degree Celsius therefore the temperature of ice is always lower than the temperature of iced water, therefore the drinks are effectively cooled with the help of lump of ice.

The answer of this cause lies behind the Newton's First Law of Motion. ... But when the tree is shaken vigorously, tree comes in motion whileleaveshave tendency to be in rest. Thus, because of remaining in the position of restsome of the leavesmay getdetachedfrom a tree if we vigorously shake its branch.

When acurrent is passed through a spring, a magnetic field is produced due to each coil of thespring.Thespringwill act like a solenoid and initially it will oppose the effect due tocurrent(inductor)but later magnetic field attracts the surrounding coils and hence thespring contractsas if it is compressed.

Velocity = Slope of the line formed in displacement v/s time graph = TanθVa : Vb = Tan60 : Tan45 = (√3) : 1 = √3:1

Option 2 is rightherethey should focus

Rays of light from object - The rays of light coming from a distant object e.g. sun or a distant building can be considered to be parallel to each other. When these parallel rays of light fall on a concave mirror along its axis, reflect and meet at a point in front of the mirror, which is called asPrincipal focusof the mirror.

1. The object is at rest.2. The object is moving with constant acceleration.3. The object is retarding or its velocity is getting reduced.

The most common use ofinfraredineveryday lifeis remote controls. These work by sending pulses ofinfraredthat spell out a message to an electronic device. This device could be a television, blu-ray player, or even a computer.Infraredcan beusedin a similar way for communication..Infraredlight is evenusedto heat food sometimes - special lamps that emit thermalinfrared wavesare oftenusedin fast food restaurants! Shorter, nearinfrared wavesare not hot at all - in fact you cannot even feel them.

·x ≈ y means x is approximately equal to y.

approximately.........

Distance in first two seconds is (1/2)g(2)² = 20Distancein first four seconds is (1/2)g(4)² = 80and Distance in first six seconds is (1/2)g(6)² = 180 so ratio of distance traveled in each two seconds is= 20:(80-20):(180-80) = 20:60:100 = 1:3:5.

Following are the advantages of AC voltage over DC voltage:

1. AC voltages have a lesser loss in the long transmission lines compared to that in DC voltage.

2.AC voltages can be easily changed using transformers.

3.AC generators have higher efficiency than DC generator and lower maintenance requirements. Also, the AC is cheaper than the DC.

4.Also AC currents appliances are safer than the DC ones.

please post clear image

Acceleration = change in velocity/time = (0 - 20) /0.1 = -200m/s²

To calculate force take Acceleration to be positive

Force = mass x Acceleration = 150/1000 x 200 = 30 N

Please like the solution 👍 ✔️👍

%Uncertainty in mass= 0.3/60 x100 = 0.5%

% uncertainty in mass = 0.1/25 = 0.4%

K.E= 1/2 mv^2K.E = m+ 2V

K.E= 0.5 + 2 x 0.4

K.E= 0.5 + 0.8

K.E= 1.3% uncertainty.

potential at infinity would be GM /R

Ans :- Let the initial mass of the body be m and its velocity be v.Initial momentum of the body = mvInitial KE = mv^2/2If the momentum increases by 10%, new momentum = mv + 10% of mv= mv + 10/100mv= mv + mv/10=11mv/10=m(11v/10)New velocity = 11v/10Increase in velocity = v/10New KE = m(11v/10)^2/2= 121/100mv^2/2Increase in KE = 21%

thnks yrr kamika

56% aprox................ If corect inform me.

Digestionis the breakdown of large insolublefoodmolecules into small water-solublefoodmolecules so that they can be absorbed into the watery blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream.

thank u

For that Frictional force = mgsin∅

=> μmgcos∅ = mgsin∅=> μ = tan∅ = tan45 = 1

so, μ = 1