Explore topic-wise InterviewSolutions in Current Affairs.

There are FOUR factors that influence the resistance in a conductor. THICKNESS (CROSS sectional area of the wire), length, and temperature. The fourth factor is the conductivity of the material that is used. Some metals (COPPER, silver) are just more electrically conductive than others (iron, aluminum).

Initial velocity(u)=0

Final velocity(v)=?

TIME Object moves after force stops(t)=2 s

Distance(s)=4 m

v=s/t

v=4/2=2 m/s

Time force acts on object(t')=0.2 s

Mass(m)=1.4 kg

Acceleration(a)=?

v=u+at

2=0+a×0.2

2/0.2=a

10 m/s²=a

F=ma

F=1.4×10

F=14 Newton

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We PREVENT copper and SILVER rusting because it's APPEARANCE become POOR and it become DULL

Hey,

For an n-p-n transistor in the common-emitter CONNECTION, the base-emitter JUNCTION is in the forward bias and the base-collector junction in the reverse. Electrons flow from the emitter to the base where some leave the base as they recombine with holes, forming the collector CURRENT and some pass into the collector forming the collector current. If we INCREASE the base current we get an increase in collector current .

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Gravitational potential energy of an object of MASS m  SITUATED at a height h  above the GROUND,

                Ep=mgh

As per the relation, Ep proportional h, i.e. an object at a greater height has larger energy.

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According to formula:

I = m₁r₁² + m₂r₂²...........mₓrₓ²

I = m₁r₁² + m₂r₂²

 = m₁(m₂l/m₁ + m₂)² + m₂(m₂l/m₁+m₂)²

 = m₁m₂(m₁+m₂)l² /(m₁ +m₂)²

 = m₁m₂l²/(m₁+m₂)

Moment of INERTIA is the tendency to change the angular acceleration.  It is GIVEN by the sum of the product of mass of each PARTICLE with the SQUARE of distance from axis of rotation.  

on rubbing our PALM they GET heated because of friction , ENERGY get converted
2● on PASSING electric current in a METALLIC wire the wire get heated because the filament get heated up and electric energy converted into heat energy
HOPE it HELPS

Answer:

REFRACTIVE index is the RATIO of the speed of light in a medium to that of ANOTHER medium.

Explanation:

for example 1u2=speed of light in medium 1 /speed of light in medium 2

because of unfavorablec ondition  of WATER CLIMATE

If METER is MOVING then we can SAY ELECTRICITY is being USED.

Given :

Luminosity of RIGEL star = 17,000 * Luminosity of Sun

SURFACE TEMPERATURE of Sun = 6000 Kelvin

Surface temperature of Rigel = ?

SOLUTION:

Luminosity is directly proportional to 4th POWER of surface temperature.

i.e, L ∝ T⁴

So, Luminosity of star/Luminosity of Sun = (Surface temperature of star/Surface temperature of Sun)⁴

11.42 * 6000 = Surface temperature of star

∴Surface temperature of Rigel star is 68520 Kelvin.

I THINK the QUESTION is not CLEAR

VELOCITY GRADIENT = dv/dx

dv = 8 CM/s

dx = 0.1 cm

dv/dx = 8/0.1 = 80cm/s cm

In other WORDS, work DONE due to displacement CAUSED by a FORCE is a scalarquantity. The dot product of vector quantities is always scalar which means it is has only magnitude and no direction.


hope this HELPFUL

Electromagnets are CALLED TEMPORARY magnets because they act as magnets only  until the CURRENT is passed through them...and they LOOSE their magnetic PROPERTIES if the flow of current is stoped

Ohm's LAW and drift velocity in conductorsFrom Physclips: Mechanics with animations and film.

proportional to the NUMBER of mass carriers/cubic metre of AIR (n)

proportional to the cross sectional AREA of 'conductor' (A)

proportional to the square of the mass on an individual mass carrier (m)

An electricity meter, electric meter, electrical meter, or ENERGY meter is a device that measures the amount of electric energyconsumed by a residence, a business, or an electrically powered device.

Electric utilities use electric meters installed at customers' premises for billing purposes. They are TYPICALLY CALIBRATED in billing units, the most common one being the kilowatt hour(kWh). They are usually read once each billing period.

When energy savings during certain periods are desired, some meters may measure demand, the maximum use of power in some interval. "Time of day" metering allows electric rates to be changed during a day, to RECORD usage during peak high-cost periods and off-peak, lower-cost, periods. Also, in some areas meters have relays for demand response load shedding during peak load periods.[1]

Let
f1 = frictional force between 15kg BLOCK and ground surface
f2 = frictional force between 5kg block and 15kg block surface
N1 = normal reaction on block 15kg block
N2 = normal reaction on block 5kg block

Because there is no upward motion
N1 = 15g + 5g = 20G
N2 = 5g

F (limiting) = µN1 = 0.6×20g = 0.6×20×10 = 120N
Because Ground can friction force can able to oppose 120N if we apply force above 120N then only block starts to MOVE . In this case block isn't move .

f1= F
f1 = 80N(because it is self ADJUSTING force)


because there is no actual relative motion and also there is no impendig of relative motion(tendency of relative motion) HENCE there is no force acting surfaces between 5kg block and 15kg block
f2 = 0 N

Anomalous are small particles of LIQUID say WATER which are closely packed.when a student want to make an experiment on water boiling POINT,when water its placed in a barrel and placed on fire,these anomalous particles of water vibrates evenly making convectional current movement of water thus enabling it to reach at ...

Light is a form of ENERGY which HELP US to see everyting which SURROUNDS us

heya

WATER is the answer to UR question.

Simply because of ice GETTING the crystal STRUCTURE with WIDELY spaced molecules. And that being wider than spacing in liquid water .

Since angle of INCIDENCE comes between normal and the plane. Normal is perpendicular to the surface..angle of INCIDENT Ray is 50 degrees so the angle of incidence will be 40 degrees

concave:

SATELLITE dishes

head lights of cars

telescopes

shaving mirrors

dentists

torches

solar powered gadgets

microscope

visual BOMB detector and

flash light mirror in camera

convex:

inside buildings

sun GLASSES 

vehicles

magnifing glass

securities

street lights

inspection purposes for places to which it is difficult to reach

kept on CORNERS of roads to see cars coming

telescope

ceiling dome mirrors

Length of copper wire=2.2 cm
Length of STEAL wire=1.6 cm
Diameter cl=3 mm=3x10*-3m
cross SECTION are=/piR*2=/pi(d/2)*2
3.14x2.25x10*-6m*2
7.1x10*-6m*2
Net elongated =0.70mm
=7X10*-4m
Let load applied is F
y=2.0x10*11N/m*2
T=1.3x10*11N/m*2
Ys=stress/strain=F/A/(ls/Ls)
Ys=(F/A)/(lc/Lc)
Ys/Yc=(F/A)/(ls/Ls)X(lc/Lc)/(F/A)
=(Ls/Lc)*(lc/ls)
2.0x10*11/1.3x10*11
(2.2)/(1.16)x(lc/ls)
lc/ls=2x1.6/1.3x2.2=1.12
lc=1.12ls
1.12ls+ls=7x10*-4m
(1.12ls)=7x10*4m
ls=3.30x10*-4m
Ys=Fxls/Axls
F=Ys x A x ls/LS
=2x10*11x7.16x10*-6x3.30x10*-4/1.6
=2x7.1x33/1.6
=292.87N

Uniform MEANS equal distance COVERED in equal intervals of time
non-uniform means UNEQUAL distance covered in equal intervals of time

Regular reflection - reflection of LIGHT that takes PLACE from plane, shiny or polished SURFACE
DIFFUSED - reflection that takes place from non Shiny, non polished or irregular SURFACES

The SHRILLNESS of a sound depends upon its frequency and pitch, the higher the pitch the shriller the sound.    As the sounds PRODUCED by their vocal CHORDS is NATURALLY higher than men. So the sounds produced from the voices of WOMEN are shriller than men.

Net FORCE is the TOTAL force acting on a particular object.

A)Because wooden screen is OPAQUE and ANYTHING PLACED behind it is INVISIBLE cause light cannot pass through it

Commercial Motor is a WEEKLY magazine serving the road transport industry in the United Kingdom. FOUNDED in 1905, it is notable for having been "the first journal to be devoted exclusively to the commercial VEHICLE engaged in the CONVEYANCE of goods or in passenger carrying".

Originally named The Commercial Motor, the title was shortened to Commercial Motor for the first issue of 1966. The publication is commonly referred to as 'CM' by its readers and editorial staff.

Commercial Motor was initially published by Temple PRESS and since 2011 it has been published by Road Transport Media.

This has equivalents in other UNITS used in SI including: where "N" is the newton (the SI unit of force), "T" is the tesla (the SI unit of MAGNETIC FLUX DENSITY), and "J" is the joule (the SI unit of energy).

MASS = 40 kg

Velocity = 0.5 m/s

KINETIC ENERGY = 1/2 m v^2

                        = 1/2 (40)(0.5)^2

                        = 1/2 (40)(0.25)

                        = 5 J

Hence its kinetic energy is 5 J

hope this answer is helpful.

They gave more stress on future planning PROGRAMS, for a period of 20 years (HENCE called a twenty-year plan) that's to formulate plans and implement those plans within the next 20 years.

Explanation:

• They gave more stress on future planning programs, for a period of 20 years (hence called a twenty-year plan) that's to formulate plans and implement those plans within the next 20 years.

• One of the recommendations was the holding of periodic road conferences to DEBATE about construction and development. This lead the way for the establishment of a semi-official technical body called Indian Road Congress (IRC) in 1934

• They suggested the imposition of additional taxation on motor transport which incorporates duty on motor spirit, vehicle taxation, license fees for VEHICLES plying for hire. This paved the way to the introduction of a development fund called the Central road fund in 1929. This fund was intended for road development.

• A dedicated research organization should be constituted to hold out research and development work. This resulted in the formation of the Central Road Research Institute (CRRI) in 1950.

Stress
it is an activity which our MIND was fully stressed and PAINING
why this will happen means by over thinking .....
STRAIN
it is ALSO similar to stress but it is over head ache and over thinking about any thing
I HOPE this helps you.....

On first WORK is not done but on SECOND The REVOLUTION of the earth AROUND the SUN in this question work is done

# ANSWER- VOLUME of CAVITY/BALL=0.16

# Explaination-

Here when put in water the water displaces/fills the empty cavity.

Volume of only metal=mass/density =9.8/7800=1.25×10^-3cu.m

Volume of whole ball including cavity= weight of water dispaced/density of water

Density of water is 1000kg/cu.m.

Volume of whole ball=1.5×10^-3cu.m

Volume of cavity=Volume of ball-volume of metal

=1.5×10^-3 - 1.25×10^-3

=0.25×10^-3cu.m

Ratio of volume of cavity/ball = 0.25×10^-3 / 1.5×10^-3 = 0.16 = 16%

0.16 FRACTION of whole ball is a cavity. i.e.16%.

According to the question

Length of minor ARC = 2/9 of circumference of the circle

we KNOW that,

Lenght of arc = theta/360 * 2πr

circumference of circle = 2πr

Apply in the question

theta/360 *2 π R = 2/9 * 2 πr

theta/360 = 2/9

theta = 2/9 * 360

theta = 80.

So, the MEASURE of angle SUBTENDED is 80°.

In bacteria and other MINOR organisms who survive by ANAEROBIC respiration which does not REQUIRE OXYGEN

It will roll until the force on it ACTING such as gravitational force and MOMENTUM will not be equal or will not will BECOME a ZERO or the initial value of the disk is zero

The SUBSTANCES which allow the ELECTRICITY and heat to pass through them.
EXAMPLE - METALS

SIMPLE harmonic motion can be expressed as follow:

y=a*cos(W*t) where w is angular acceleration and

w=2*pi/T

So, when we differentiate the above equation we get expression of VELOCITY given by:

v=-a*w*sin(w*t)

For a complete TIME period,

t=T

So,

The average velocity= -a*w*(average of sin(w*t) over time period T)

Average of Sin function over a complete cycle=0

Therefore,

The average velocity of a particle performing S.H.M. in one time period is 0.

The part of the AC GENERATOR that passes the current from the ARMATURE coil to the external CIRCUIT is commutator