Recent content by kelvin56484984

Sorry, I made some mistake previously and I modified the question. If I want to find the flux of the bottom face, top face, side surface of cylinder and the tangent surface of the cylinder, How can I express it in inequality?

Homework Statement F(x,y,z)=4x i - 2y^2 j +z^2 k S is the cylinder x^2+y^2<=4, The plane 0<=z<=6-x-y Find the flux of F Homework Equations The Attempt at a Solution What is the difference after if I change the equation to inequality? For example : x^2+y^2<=4, z=0 x^2+y^2<=4 , z=6-x-y...

Why the gaussian surface is "A" instead of "2A" on the right-hand side?(the photo attached below) Due to the thickness of the sheet? I usually find that E=σ/2ϵ0 is being frequently used but we hardly use E=σ/ϵ0. When can I directly apply the equation E=σ/ϵ0 ?

thanks for the reply Should u and v be [0,pi/2],[0,4] respectively ? thus, the integration is \int_{0}^{4}\int_{0}^{\frac{\pi}{2}} (4cosu,2sinu,v)\cdot (2cosu,4sinu,0) dudv =\int_{0}^{4}\int_{0}^{\frac{\pi}{2}} (8cos^{2}u+8sin^{2}u)dudv For the second part, If I use the shperical coordinate...

Homework Statement Verify the Divergence Theorem for F=(2xz,y,−z^2) and D is the wedge cut from the first octant by the plane z =y and the elliptical cylinder x^2+4y^2=16 Homework Equations \int \int F\cdot n dS=\int \int \int divF dv The Attempt at a Solution For the RHS...

Homework Statement I.The gas is heated at constant pressure until the volume is 4.4L at point B II. The gas is cooled at constant volume until the pressure decreases to 1.2 atm III. The gas undergoes an isothermal compression back to point A a) Find the temperature at Point A,B,C b) Find the...

Homework Statement If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?Homework Equations Ec=1-Tc/Th The Attempt at a Solution 1-25/250 =90% or 1-(25+273)/(250+273) =43% In this question,which one should I use K or ºC ? thank you

Homework Statement 1. A gas expands as shown in the graph. If the heat taken in during this process is 1.02 × 10^6 J, the change in internal energy of the gas (in J) is 2. One mole of an ideal gas is held at a constant pressure of 1 atm. Find the change in volume if the temperature changes by...

Yes , I make some mistakes when drawing the circuit Vo should be at the collector

Thank you the resistot with wrong label is the internal resistor of the signal generator I think it can be neglected during the calculation since the value is not given

Homework Statement assume β=200,Vt=26mV,Vbe(on)=0.7V Find the voltage gain Vo/Vs How to find the Rth , Vs ,then find the voltage gain? I try to draw the circuit diagram below Homework EquationsThe Attempt at a Solution Vth=[R2/(R1+R2)]*15 Vth=1.63V Which method should I use to find Rth...

I am learning how to connect a BJT circuit on breadboard.I find this tutorials https://backyardbrains.com/experiments/transistorDesign#prettyPhoto If I want to remove all the input components ,I connect to a power supply How to connect the circuit to the ground and provide +9V to the circuit ?

But I substitute vi=60 to 50*sin30=Vi*sin30*t -1/2gt^2 I get t=0.995s or 5.127s then put the t =5.127 into x=x0+vi*cos30*t then x=266 what's wrong with it?

Vi equal to 60?