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1. ### Shm , calculation of amplitude of spring mass system

Yes I know the method through extension at equilibrium ... But I want to check out the method of COE for future purposes... Can u please just tell me the equation that u would use and the two points that u would consider for solving through COE ?
2. ### Shm , calculation of amplitude of spring mass system

Homework Statement In A spring mass system , the spring stretches 2 cm from its 's frelength when a force of 10 N is applied . This spring is stretched 10 cm from it's free length , when a body of mass m = 2 kg is attached to it and released from rest at time t = 0 . Find the A) force constant...
3. ### Equation of shm for different positions

Homework Statement Write the equation for a particle in simple harmonic motion with amplitude a and angular frequency w considering all distances from one extreme position and time when it is at other extreme end. Homework Equations X = A sin (wt + ∆) ∆ = phase difference The Attempt at a...
4. ### Reading of a voltmeter having resistance R across a resistance

Homework Statement The potential difference across resistance R carrying current I is V = IR . Now if the potential difference is measured via voltmeter of resistance r , the reading on voltmeter is V' . Prove that V' = Ir/(R+r) . For what value of r does the voltmeter measure true value...
5. ### Calculating resistances via a potentiometer

I didn't ask for your pity mister , only solution.. also don't presume I didn't consider the non ideal voltage source with some internal resistance , I didn't add it to my answer as the question doesn't mention any internal resistance .. which is odd for the 12th level book!
6. ### Calculating resistances via a potentiometer

Homework Statement Figure shows a potentiometer circuit for comparison of two resistances , the balance point with standard resistor R = 10 ohm , is found to be 58.3 , while that with unknown resistance X is 68.5 cm , determine the value of X . b) what might you do if you failed to find the...
7. ### Constraint relation in a pulley spring system

That's the issue .. I don't know how to establish a relation..
8. ### Constraint relation in a pulley spring system

Why should it rotate ? It's fixed to a table so the tension in both strings should be same
9. ### Constraint relation in a pulley spring system

Homework Statement How to apply constraints in the system to get a relationship between the displacements of block of mass m and pulley of mass M.? Homework Equations ∑T.a= 0 The Attempt at a Solution Assuming tension in both strings to be T . -T × a1 ( for the block) + 2T × a2 ( for the...
10. ### Time constant for parallel RC circuit

Homework Statement Question 6. Homework Equations Time constant = RC The Attempt at a Solution I think answer should be 1/2 RC as Rnet = 1/2R and to convert it to single resistance form we should first find Rnet But the answer is coming out to be RC . How? << Corrected Image added by...
11. ### Amplitude of a mass joined to a spring in the presence of an E-field

I don't understand how to write the conservation of energy equation for this case
12. ### Amplitude of a mass joined to a spring in the presence of an E-field

Homework Statement A block of mass m having charge q placed on smooth horizontal table and is connected to a wall thorough an unstretched spring of constant k . A horizontal electric field E parallel to spring is switched on. Find the ampliture of the shm by the block. Homework Equations kx=...
13. ### Current through source in AC circuit with R & LC in parallel

Homework Statement In the circuit diagram shown , Xc = 100 ohm , XL = 200 ohm , R = 100 ohm , the effective current through the source is ? Homework Equations Z= √( R^2 + ( XL - Xc)^2) Vrms = Irms/ Z The Attempt at a Solution I tried to draw the phaser diagram and calculate the relation...
14. ### Why is resistance of similar cases calculated differently?

But I still don't get why integration is required .. it's not like specific resistivity is changing... And shouldn't length by taken as 2R-R = R only then??
15. ### Why is resistance of similar cases calculated differently?

Homework Statement 1.In the WE-11 resistance is calculated by integrating and that too by taking length as dr and area as the CSA of the small cylinder .. Shouldn't length be l and area by 2πrdr..? I also don't understand why can't we simply use Dl/A formula , Where A =π((2R)^2 - R^2) 2)...
16. ### Engineering An electric bulb of 500 W at 100v is used in a circuit

Acc to question ifthe bulb is connected to 100V supply power dissipated by it will be of 500 W I have used that info to find resistance of the bulb which will remain constant irrespective of circuit conditions Now if the bulb is connected to 200 V supply and the bulb still dissipates 500W that...
17. ### Engineering An electric bulb of 500 W at 100v is used in a circuit

1. Yeah it refers to bulb 2. 10000 is for V^2 where V = 100 3. So that means that what I have calculated is basically power across R + bulb instead of only bulb? Also if the resistance R was in parallel .. then my answer would have been correct??

Bulb I guess
19. ### Engineering An electric bulb of 500 W at 100v is used in a circuit

If the circuit has 200 V supply. The resistance R that must be put in series with bulb so that it draws 500 w is? 2. Relevent equations P= v^2/r I = v/r 3. My attempt at the solution R= V^2/P r (bulb)= 10000/500 = 20 ohm Now for 200 v supply .. P= 500 W V= 200V Rnet = 20 + R R+20= 80 R= 60...