Recent content by thereddevils

thank you.

Homework Statement 1.0 g of water at 28 degree celcius is placed into a 200g aluminium can at 300 degree celcius. What is the temperature of the aluminium can after all the water vapourises? Given the specific heat capacity of aluminium, 900 J/kg/degree celcius and water, 4200 and specific...

Thanks for all the help! Cheers.

What a miss! Obviously, the voltage of the upper input terminal is 4V and having the same current flow, (8-4)/20k = (4-Vo)/100k Vo=-16V Am i right?

ok thanks all for helping.

I understand this. The difference between V+ and V- is zero if connected with a negative feedback resistor? Is V- = 8V and V+ = 4V? I am still confused with the potential difference across the positive and negative input terminals.

Never mind, i got it.

Thanks Gneill for your reply. Ok, since the input impedance of the op-amp is very high, the current flowing through the 20 k ohm resistor is the same as the one through the 100 k ohm resistor. I am not sure about point 2. Why are the voltage of the input terminals the same? How do i set...

so the answer should be C?

Thanks Dadface for all your help.

I counted 7.5 and taking a closer look the interval is 0.16. f=8/(0.16)=50 What is this frequency? Is it the frequency of one of the sources? Or is it the resultant frequency? By the way, the answer given is A

Ok, let me try. Initially, charged capacitor has Q=10C1 coulomb of charges before being connected. After connected, the total charge flowing in the circuit is 6C1+6C2. Since the total charge is a constant, 10C1=6C1+6C2 Therefore, C1/C2=3/2 Am i correct? Another side...

Thanks Shivpal, but i don get the meaning of this sentence. 'your oscillator must be 1m away from the lowest position moving toward the center.'

When the charged capacitor is connected to the uncharged capacitor, the charged one will discharge until its potential drops from 10V to 6V and the uncharged one is being charged till its pd is 6V. I am not sure about setting up the equations.

Homework Statement See attachment. Homework Equations The Attempt at a Solution I am not familiar with questions like this. The usual op-amp i see have either of the terminals earthed so i need some hints to get started. Thanks.