Explore topic-wise InterviewSolutions in .

A fixed pulley is a simple machine that uses a wheel with a groove in it and a rope that fits into the groove. The other end of the rope attaches to a load, or the object you're needing to move. A fixed pulley is different from a movable pulley because the wheel does not move. The rope simply moves over the groove of the wheel when force is applied

It is useful because when you pull down you can use your body’s own weight to add to the push.

E = qVq = esoE = 100eV

The answer is Option B.

Let m1 = 100 g. m2 = 150 g. m3 = 200 g. a = 0.5 m = 50 cm.

Center of mass coordinates : x = [-a/2 * m1 + 0 * m2 + a/2 * m3] / (m1 + m2 + m3) = (m3 - m1) a /[2 (m1+m2+m3) ] = (200 - 100)*50 / [2 * 450] cm. = 50/9 cm

y = [0 * m1 +√3/2 * a * m2 + 0 * m3 ] / (m1 + m2 + m3) =√3/2 * a * m2 /(m1 + m2 + m3) =√3/2 * 50 * 150 /450 cm = 25/√3 cm

y coordinate of the centroid of the triangle: 1/3 * √3/2 * a = 25/√3 cm

Thus the center of mass is 50/9 cm to the right of the centroid G of the triangle ABC.

the answer will be b 4.9m/s^2

... Ans: The amount of heat energy released or absorbed when a solid changing to liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.

latent heat of melting is also called latent heat of fusion.

it is defined as the amount of heat energy released when a soli(ice) changes into liquid(water) without changing its temperature is called latent heat of fusion.

Acceleration = 4.2-1.8/1.2

=2.4/1.2

=2m/s^2

Force =m*a

=5.5*2

=11N

given x = 2t²-4t+1

at t = 0 , x = 1 and at = 2 , x = 1

now , maximum displacement is when dx/dt = 0 => 4t-4 = 0 => t = 1 sec and maximum displacement is = 2(1)²-4(1)+1 = 2-4+1 = -1

so, maximum displacement is -1-1 = -2

and in t = 0 to 2 sec , particle goes for 1 to -1 and then comes back at x = 1, (t = 2 sec)

so, net distance = |-2| +|-2| = 4m

Work and energy have same dimensional units(J) therefore can be considered the same.Let me know if you need a more detailed answer.

To find distance travelled put t= 2 in xdistance travelled,x=2+8(2)-4(2)² =2+16-16 = 2 m

We know that, s=rθ

Since it changes its direction after travelling 628m. Using the above formula, 628=r(π/2).

Solving further we get, r=400

Now centripetal force= mv2/r

Further substituting the value of r above we get1000*16*16/400=640N

We are given a concave mirror.

Object distance= u

Image distance, v = - 50 cm

Focal length = f=-20cm

Now,

1/f = 1/v + 1/u

-1/20=-1/50+1/u

1/u=1/50-1/20=-3/100

u=-100/3=-33.3cm

This is the distance of object from mirror,now distance of the object from the wall=-50-(-33.3)=-16.7cm

i.e 16.7cm left of the mirror.

We are given a concave mirror.

Object distance= u

Image distance, v = - 50 cm

Focal length = f=-20cm

Now,

1/f = 1/v + 1/u

-1/20=-1/50+1/u

1/u=1/50-1/20=-3/100

u=-100/3=-33.3cm

This is the distance of object from mirror,now distance of the object from the wall=-50-(-33.3)=-16.7cm

i.e 16.7cm left of the mirror.

a correct answer is (1) zero

KE= 1/2.m.v^2log KE = log 1/2 + log m + 2logvdifferentiating,delta(KE)/KE = delta (m)/m + 2.delta v/vbut given.... [delta m/m=2/100] and [delta v/v=3/100]putting the value we get.delta KE/KE= 8/100% error(max)= [ delta KE/KE ].100 = 8% (ANS)

correct option is B as inverse of power gets multiplied=> 1/(1/2) = 2

The correct answer is A, because power gets multiplied in the calculation of error.

no your answer is wrong according to given in solution

then , the answer should be C, as the power is 4, giving more, but negative error.

Lightin which wave oscillate only in one angle. Then it is calledpolarized light. If it oscillate in all the angles then it is calledunpolarized light. we canpolarizedalightusing a filter which only allowslightin a certain angle.Whenunpolarized lightis transmitted through a Polaroid filter, it emerges with one-half the intensity and with vibrations in a single plane; it emerges aspolarized light. A Polaroid filter is able to polarizelightbecause of the chemical composition of the filter material.The elctric field vector which are parallel to the transmission axis of palaroids gets transmitted and other which are perpendicular to its transmission axis will be absorbed.If electric field are not horizontal or vertical then they should be split into horizontal and vertical components

There are only two conditions where this holds. Either:

The materials have the same index of refraction

or the angle of incidence is zero

No it does not occur due to dispersion.

A stick or apencilhalfimmersed in waterat an angle appears bent due to refraction of light at the air-watersurface. ... As a resultimmersedportion of the stick appears to be bent when viewed at an angle from outside

The main reason behind this phenomenon is refraction. ...Water has higher refractive index than air which causes refraction. Due to the change in medium the speed of light decreases. The refraction causes difference in speed of light thestick kept inwater appearsto bebentor broken.

The electric linesof force emanate fromapositive charge and terminate onanegative charge.

Thetangent to anelectricfieldlineatanypoint givesthedirection ofthe electricfield atthatpoint.

Two electric linesof force can never cross each other.

An a.c ammeter is based on the heating effect of current. Since heat produced is proportional to square of current and not directly to current, the divisions marked on the scale are not equally spaced.

a cultivated plant that is grown on a large scale commercially, especially a cereal, fruit, or vegetable.

hope this will help you like my answer and MARK IT AS BEST ANSWER.

all the grain, fruit, vegetables, etc. of one type that a farmer grows at one time

किसान द्वारा एक ही समय में उत्पादित किए जानेवाले एक प्रकार के अन्न, फल, सब्ज़ियाँ आदि; फ़सल, पैदावार, उपज

crop is icon which we cut or select image

a crop is a plant which is grown in huge quatities

cultivated plant that grow on large scale

A crop is a plant or animal product that can be grown and harvested extensively for profit or subsistence. Crop may refer either to the harvested parts or to the harvest in a more refined state. Most crops are cultivated in agriculture or aquaculture. A crop is usually expanded to include macroscopic fungus, or alga.

Magnetic lines of force have a number of important properties, which include:

They seek the path of leastresistancebetween opposite magnetic poles.

They never cross one another.

They all have the samestrength.

Field lines never intersect each other.

They are perpendicular to the surface charge.

The field is strong when the lines are close together, and it is weak when the field lines move apart from each other.

The number of field lines is directly proportional to the magnitude of the charge

Field lines never intersect each other.

They are perpendicular to the surface charge.

The field is strong when the lines are close together, and it is weak when the field lines move apart from each other.

The number of field lines is directly proportional to the magnitude of the charge

Propertiesof anElectric Field

Field linesnever intersect each other.

They are perpendicular tothesurface charge.

The fieldis strong whenthe linesare close together, and it is weak whenthe field linesmove apart from each other.

Thenumber offield linesis directly proportional tothemagnitude ofthecharge

electric field lines never intersect each other.perpendicular to surface charge.no. of field lines is proportional to magnitude charge

Ordinary dielectric transparent media will have a higher index for blue than for red. There are always some absorption bands in the infrared and in the ultra-violet.

In between two absorption bands, the index alwaysincreasestoward shorter wavelengths.This is normal dispersion.

In the absorption band itself, the index willdecreasetoward shorter wavelengths. This latter phenomenon is called “anomalous dispersion.” (or sometimes “resonant dispersion.”)

There is a close relationship between the absorption versus wavelength and the index versus wavelength. Mathematically, it is known as the Kramers-Kronig relationship, which means any two media with identical absorption bands will have identical dispersion relationships.

When current is flowing in a conductor the magnetic field works out to push most of the conduction to the outer surfaces of the conductor. So a hollow copper pipe works about as well as a solid copper conductor, at least for high-frequency AC.

One way around this is to use a bunch of insulated wires, randomly twisted together and only tied together at the ends. The magnetic fields roughly cancel each other out so each wire sort-of is its own skin-effect universe, and all the wires in parallel carry the current with less resistance than one solid wire. Some high-efficiency coils in some old radios used this kind of wire, called Litz wire.

The simple formula used for finding distance when time and speed is given , to be used here .

Distance = Speed × Time

Given Speed = 340 m/s

Given Time = 10 s

Required distance = Speed× Time = 340×10 = 3400 m = 3.4 km

Paper Cups vs. Styrofoam Cups

It’s a common sight to see people walking around carrying coffee in paper or Styrofoam cups. The insulative values of paper and Styrofoam aren't that different, but Styrofoam cups generally are much thicker than paper ones, so they keep your coffee hot longer. However, drinking from a Styrofoam cup is unappealing to many people because it’s not the most eco-friendly choice. Paper biodegrades much faster than Styrofoam.

The weight would be zero.

If the earth is regarded as a hollow sphere, then what is the weight of an object below the surface of earth

multicultural society: multicultural society is a vision of a society, where people with different nationalities, languages, religions and ethnicities living together. People with different cultures can have different traditions, lifestyles or imagine of values and ethics.

As you can see there is no net displacement of centre of mass of the whole system as the boy moves toward the shore boat moves to the opposite side to balance the centre of mass.

Say that the boat moves by distance x away from the shore therefore boy moves x-8

as you can see there is no net external force delta x of centre of mass is zero therefore,

M1 X1 + M2X2 = 0 200(x) + 80(x-8) = 0

280x = 640 x = 2.3

Therefore boy moves 8-2.3 = 5.7 towards the shore

Now the total distance between the shore and the boy is 20 - 5.7 = 14.3

According to the Law of conservation of momentum, momentum has to remain conserved. The momentum of meteorite is transferred to air molecules and ultimately to the earth.

Displacement is the correct answer

Answer: A) DisplacementExplanation:A displacement is a vector whose length is the shortest distance from the initial to the final position of a point P. It quantifies both the distance and direction of an imaginary motion along a straight line from the initial position to the final position of the point

from conservation of momentum , it should be -p since sum of momentum from COM , should be 0.

so option B

Myopia: (nearsightedness) This is adefectof vision in which far objects appear blurred but near objects are seen clearly. The image is focused in front of the retina rather than on it usually because the eyeball is too long or the refractive power of the eye's lens too strong.Please hit the like button if this helped you