Explore topic-wise InterviewSolutions in Current Affairs.

Answer:

Answer. when we have rollers at one end then it is ALLOWED to expand freely without any thermal stress.in SUMMERS the bridges may expand due to the increase in the temperature and in winters the bridges may compress due to decrease in the temperature.

Steel girder are used to construct a bridge. One girder is fixed in a concrete while the other end is not fixed in concrete. It is SUPPORTED on rollers so that if there is any changes in the temperature during change of seasons, GIRDERS may contract or expand without affecting the concrete.

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Answer:

an instrument for MEASURING the STRENGTH of an ELECTRIC current

Explanation:

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The dimensional formulae of charge, electric potential and resistance is as FOLLOWS:

• The electric current can be FOUND out by using the formula:

Q = I*t

Where q = charge

I = current

t = time

Therefore the dimensional formula will be  [M⁰L⁰T¹I¹].

• We know that E = qV

Where E = Potential energy

q = charge

V = electric potential

V = E/ q

The dimensional formula of any kind of energy is [M¹L²T⁻²]

The dimensional formula of electric charge= [M⁰L⁰T¹I¹]

Therefore the dimensional formula of electric potential V = [M¹L²T⁻³I⁻¹]

• Resistance = VOLTAGE*Current⁻¹

Voltage = [M¹L²T⁻³I⁻¹]

Current = [M⁰L⁰T⁰I]

Therefore dimensional formula of resistance = [M¹L²T⁻³I⁻²].

ANSWER:

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Answer:

Let a projectile move with a VELOCITY u which is INCLINED with the HORIZONTAL at angle of θ. The velocity after time 't' will be

v=v

x

i

^

+v

y

j

^

v=ucosθ

i

^

+(usinθ−gt)

j

^

(Since:v

y

=usinθ−gt)

At maximum height the projectile will only have horizontal COMPONENT that is

v

x

=ucosθ

v

y

2

−u

y

2

=2ay

v

y

=0(atmaxheightH)

u

y

=usinθ

ay=−gH

Puttingthesevalues,

0=(usinθ)

2

−2gH

H=

2g

u

2

sin

2

θ

Explanation:

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ANSWER:

I REALLY don't no

Explanation:

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A particle moves along x-axis in such a way that its x-coordinate varies with time according to the equation x = 4 - 2t - t². How will the speed of the particle vary with time?

Consider a particle MOVING on x axis. The distance travelled by the particle along the x axis is given by the function of time

x=4−2t−T2  

Rate of change of coordinate w.r.t time is dxdt=d(4−2t−t2)dt  

⇒dxdt=−2(1+t)  

Here, -ve sign indicates that the particle is moving towards the origin,  

When t=0 the particle is at, x=4−2×0−0=4⇒the particle is 4 units  

away from the origin  

At t=0 and at x=4 the speed of the particle w.r.t. coordinate of x axis is  

dxdt=−2(1+t)=−2  

Now, the ACCELERATION of the particle can be found from the given function  

d2xdt2=d2(4−2t−t2)dt2=−2  

Here, -ve sign of the second derivative indicates the direction motion of the particle, which is towards the origin

When the x coordinate of the particle BECOMES 0? To know this roots of the function are found

⇒The roots of the function 0=4−2t−t2are,1.−3.2362.1.236  

Since time is not negative the value 1.236 is taken. Hence at t=1.236 units the particle reaches origin

For example when t=1 ; x=4−2t−t2=1units  

⇒ distance covered by the particle is 3 units  

The speed of the particle at 1 unit is −2(1+t)=−4 units per unit time  

When, t=3; x=11, and the total distance travelled fromt0tot3is 15 units  

This can be CHECKED by using the equation s=ut+12(a)t2  

Data, u=−2,t=3,a—2  

|s|=|−2×3+12(−2)(3)2|  

s=|−6−9|=15units

ANSWER:

B is the answer

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Answer:

It INDICATES that the magnetic field is same at all points inside the SOLENOID. This property is UTILISED to magnetise a piece of magnetic material like soft iron when PLACED inside the coil. Two ways by which the STRENGTH of an electromagnet can be increased :Increase the amount of electric current through it.

Answer:

The current record holder for the World’s Largest Ferris Wheel is the High Roller in Las VEGA, Nevada. The diameter of this wheel is 158.5 m, and it takes 30 minutes to complete one revolution.

What is the angular velocity in radians per hour of a point on the EDGE of the wheel?

Explanation:

The excerpt below is from a speech Winston Churchill gave in the HOUSE of Commons. He VOICES his opinion of the Munich Pact as a way to approach Axis aggression. Discuss his opinion of the agreement. How effective does he think it will be? What solution does he suggest? Why? Use your knowledge of the Topic and the excerpt to write your answer.

THIS IS THE SPEECH:

" And do not suppose that this is the end. This is only the beginning of the reckoning. This is only the first sip, the first foretaste of a bitter cup which will be pre-offered to us year by year unless by a supreme recovery of moral health and martial vigour, we arise again and take our stand for freedom as in the OLDEN time.”

ANSWER:

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ANSWER:

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ANSWER:

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Answer:

didn't understand

Explanation:

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ANSWER:

About 0.14% of water molecules released from the SURFACE are expected to end up in the TRAPS, hopping an AVERAGE of 3 times before ESCAPING or being trapped. Geology[edit]. Main article: Geology of Ceres. Ceres has ...

ANSWER:

STATE NEWTON's THIRD LAW

Explanation:

+6c and-20C are joined in SERIES

so, the direction of current TOWARD

-20c

Explanation:

The INHERITED TRAITS undergo modification may be due to chromosomal ABNORMALITIES. Through hereditary, variations between individuals can accumulate and CAUSE species to undergo evolution by natural SELECTION.

Answer:

3

Explanation:

Thermos keep the LIQUID hot for some TIME then slowly reducing its temperature with time.

ANSWER:

Your muscles do some work when you start to get you up to walking speed. According to physics there is no work being done once you get up to a constant speed. At a constant speed there is no acceleration, no force, and no work. Unfortunately, just because you aren't doing any work doesn't mean your muscles aren't consuming any energy, muscles are inefficient like that.

When you are climbing up a hill or a ladder you are doing work in a physical SENSE, since you are fighting gravity trying to PULL you down. Your muscles then have to consume EXTRA energy, some of it ends up doing work to make you go up and some gets wasted in your muscles.

Answer:

UNIT CONSUMED in ONE HOUR is 16.5

Explanation:

(220×75)/1000

=16.5

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ANSWER:

B.........................

ANSWER:

your answer is

FALSE. ....

EXPLANATION:

I HOPE your answer is WRITE.

Answer:

The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by MASS. ... For example, in a NITROGEN dioxide (NO2) MOLECULE, the ratio of the number of nitrogen and oxygen atoms is 1:2 but the mass ratio is 14:32 (or 7:16).

answer :-

A Fresnel Biprism is a thin double prism PLACED base to base and have very SMALL REFRACTING angle ( 0.5o). This is equivalent to a single prism with one of its angle NEARLY 179° and other two of 0.5 o each. The INTERFERENCE is observed by the division of wave front.

Answer:

the EQUIVALENT capacitance when IDENTICAL capacitance are CONNECTED is c' = 2C

ANSWER:

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Answer:

a BODY is projected upward by MAKING angle \THETA with the horizontal velocity of 300 m/s FIND the value of \theta so that the horizontal range will be maximum, hence find its range and time of flight,

Answer:

the amplitude of the SHM depends upon the phase DIFFERENCE and initial phase ANGLE if initial phase is 0 and phase difference lets say π/6

then, amplitude will be cos 30 degrees = Amplitude/radius

i.e. √3/2 = a/ 2

a = 1.7 cm

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Answer:

Example of scale PRODUCTS: distance, speed, mass etc.

Example of vector products: displacement, velocity, acceleration, FORCE etc.

Explanation:

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Answer:

WAVELENGTH can be defined as the distance between two SUCCESSIVE CRESTS or troughs of a wave. ... Wavelength is INVERSELY PROPORTIONAL to frequency. This means the longer the wavelength, lower the frequency. In the same manner, shorter the wavelength, higher will be the frequency.

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ANSWER:

Calculate the magnitude of electric field at a POINT distance 1 ) 5MM from +2NC 2 ) 0.4m from -12micro ...

ANSWER:

The value of magnification for convex lense is 1 and for concave lens is 0.2

Explanation:

Given DATA:

Power of lenses: +2D and - 4D

+2D indicates that the lens is converging

lens (convex lens)

Distance of object p =1/f

Focal LENGTH f= 50 cm

i)-4D indicates that the lens is diverging lens

(concave lens)

Therefore the focal length is -25 cm

*To calculate the image distance for

convex lens

u = -100 cm

f 50 cm

V= (fx u)/(f-u) = 100 cm

V= -(fx ul/(f+u)

V -20 cm

magnification =v/u = 20/100 =0.2

ANSWER:

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EXPLANATION:

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ANSWER:

mechanics..

thermodynamics..

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EXPLANATION:

Electric motors are found in INDUSTRIAL fans, blowers and pumps, machine TOOLS, household appliances, power tools and disk DRIVES. Small motors may be found in electric watches.

ANSWER:

the ROLE of oh is not more useful in our life

but it is used in fun , sadness

LIKE oh,so sad and for fun like oh you are in love

Some PEOPLE use this word more in our life

and some use this word only for sadness etc ......

EXPLANATION:

COOL AIR

HOPE it HELPS you

Answer:

FINDING the AREA under velocity-time GRAPH upto 10 seconds(along with sign) gives the displacement. i think you have not provided the graph as an attachment, but this above information will help you to solve this question by yourself.

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ANSWER:

thanks for free points

Explanation:

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Correct option is

D

t=  

qE

3

​

mv  

0

​

​

E

 is PARALLEL to  

B

 and  

v

  is perpendicular to both. THEREFORE, path of the particle is a HELIX with increasing pitch. Speed of particle at any time t is

v=  

v  

x

2

​

+v  

y

2

​

+v  

z

2

​

​

....(1)

Here, v  

y

2

​

+v  

z

2

​

=v  

0

2

​

And v  

x

2

​

=(  

m

qE

​

t)  

2

And v=2v  

0

​

SUBSTITUTING the value in eq (1), we get

t=  

qE

3

​

mv  

0

​

​

Answer:

yes,it includes dust, suspended unburned CARBON particles formed by INCOMPLETE combustion of FOSSIL fuels which is a POLLUTANT

ANSWER:

The UNIT of HEAT is JOULE

I think option (C)

but I am not SURE....

ANSWER is 3.6m/s2

I HOPE this is FULFIL for you

ANSWER:

RADIAN is DIMENSIONLESS.

The DIMENSION of rad/sec is T^-1.

ANSWER:

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ANSWER:

vaccum

Explanation:

space

where no MATTER is there

ANSWER:

(খ)EFG অর্ধবৃত্তের পরিধি কত?