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Yes. When a ball is thrown vetrically upwards, then at the topmost point it has zero velocity but acceleration is non-zero and is equal to g = 9.8 m/s.

This is called the zero error of the scale of ammeter or voltmeter. If there is a zero error, then this error is subtracted from the value that it depicts when the circuit is closed, otherwise the accurate current or P.D. will not be recorded

Work must be done againstfriction as well as gravity.The work done against gravity is change in potential energymgh=2×10×10=200JThe remaining work done againstfriction is 100J.

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Answer:b)150JExplanationLike if you find it useful

the correct statement is d

As we know that ;Resistance = Resistivity*length/areaHere we note that the resistance is directly proportional to length and inversely proportional to area of cross section ....Now a/c to question,;Length of wire is double then area is reduced to half...NowNew resistance = resistivity*2length/area/2New resistance =(resistivity*length/area)*4New resistance = 4resistance

Hit like if you find it useful

As we know that ;Resistance = Resistivity*length/areaHere we note that the resistance is directly proportional to length and inversely proportional to area of cross section ....Now a/c to question,;Length of wire is double then area is reduced to half...NowNew resistance = resistivity*2length/area/2New resistance =(resistivity*length/area)*4New resistance = 4resistance

The given resistance of wire 4 ohms If resistance is doubled then new resistance will be 8ohms

answer will be 12 as it is doubled

answer was 12 because 6+6=12

Resistance formulae :

R = V/I

Where :

R = the resistance

V = voltage

I = current

If the I is increased by 50% then the new I = 1.5I

The new resistance becomes :

2R

2R = 1.5I /V

V = 1.5I/2R

V = 0.75(I/R)

The V changes by 0.25

The percentage change = 25%

Is there any additional Information provided?

ans kon ho ga

The wire should be of small diameter and low resistance

Kirchhoff's current law, which states that the sum of the currents entering and exiting a node is zero, is essential in the analysis.The first step is to recognize that at a node where equal resistances exist, current entering the node will be distributed equally between the number of output branches - in this case three.

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Currentiwill be split into 3 branch currents. Since the resistance is same (i.e. r ohm), Current in each branch will bei/3. Thisi/3current will in turn split into 2 branch currents each of valuei/6.

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The next step is to sum the voltage from input node "a" to output node "b." Any path you take travels along three edges, The current between 2 diagonally opposite side will be composed oftwo i/3 currents and one i/6 current.

So that total voltage drop will be same along any path, let the volage drop be V

(i/3)r + (i/3)r + (i/6)r = V

V = (5i/6)r

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Finally, apply Ohms law, which says that the resistance is equal to the voltage divided by the current.

Let the equivalent resistance be R

R = V / i

R = (5i/6)r/i

R = 5r/6 ohm

=> R = 5(6)/6 = 5ohm

Requires large piece of land

Distillation process is not good for environment

Spike in food prices

Water attraction

Difficult to vaporize

I can't get you properly please explain properly

Thankyou Sobha Jha...

We need to manage our natural resources because natural sources are limited.We need to conserve it forward future otherwise it will be finished. For example-Tree is a natural resource. We get Oxygen, food, medicine etc.Now a days, pollution is increasing. ... That's why we have to manage/save our natural resources.

f = [1.6 x 10^-19 x 3.5 x 10^4]/ 6.63 x 10^-34 = 8.4x10^18 Hz

Therefore the wavelength l (= c/f) is 3 * 10^8/8.4x10^18 Hz = 0.357 x 10-10 m = 0.036 nm (compared with some 600 nm for yellow light).

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microwave> radiowave> x-ray>gammara

The kinetic energy of the electron is given as:E=eV= 1.6 × 10−19× 50 × 103= 8 × 10−15J

Acceleration Formula.Acceleration Formula.Accelerationis a measure of how quickly the velocity of an object changes. So, theaccelerationis the change in the velocity, divided by the time.Accelerationhas a magnitude (a value) and a direction

Let us consider the two resistances as 4Ωand 12Ω.Case 1:If we use the only resistor of resistance 4 Ω in the circuitthe net resistance is 4 ΩCase 2:If we use the only resistor of resistance 12 Ω in the circuitthe net resistance is 12 ΩCase 3:If we combine the resistors of resistances 4 Ω, 12 Ω in series,the net resistance of the combination is expressed as the following:4 Ω + 12 Ω = 16 Ω

no it is not correct answer

thanks

Energy = 1100W = 1.1Kw

Energy=power*time=1.1(kw)*2(hr)=2.2kwh

Energy used in a day=2.2 unit

Energy used in 30 days= 2.2×30unit = 66unit

Total cost=66×5=330 rs

Stress = Force / Area of cross section.

Area of cross section depends on square of radius, so the ratio of areas is 4:1

Stress is inversely proportional to area so the ratio of stresses will be 1:4

Power of combination= 6 D+(-2 D ) = 6 D -2 D = 4 D power = 1/focal length(m) 4 = 1/ff = 1/4 f = 0.25 metres f of combination = 0.25 * 100 = 25 cm

Dispersive power ∝ refractive angle

Ratio of dispersive power= 10:20=1:2

Let us say it is a convex lens of focal length f. It can form both real and virtual images.

1/v1 - 1/x= 1/f, here v & f are positive and u is negative.1/v1 + 1/x1 = 1/f --- (1)=> x1/v1 + 1 = x1/f -- (2)

The virtual image is formed in front of the lens. So v and u1 are negative.- 1/v2 + 1/x2 = 1/f --- (3)- x2/v2 + 1 = x2/f --(4)

Magnification = v1/x1 = v2/x2 ---(5)

Add (2) and (4) and use (5) to get: 2 = x1/f + x2/f => f = (x1 + x2)/2

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energy remains constant.. so , only exchange of energy takes place..

also Potential energy depends upon reference level and no. mass and velocity

and since force is maximum at extreme level so, acceleration is also maximum at extreme level and minimum at midpoint.

so option C

When acidified water is electrolysed, hydrogen and oxygen is formed. Here a single substance water breaks up into two simpler substances, hydrogen and oxygen. So, this is a decomposition reaction.