Recent content by scrubber

Q = (25-Tinner wall)/(Rth,inner) = (Tinner wall-TOuter wall)/(2.549) = (TOuter wall-10)/(Rth,outer) Q = (25-Tinner wall)/(0.0833) = (Tinner wall-TOuter wall)/(2.549) = (TOuter wall-10)/(0.0231) Is this what you mean?

Rth,inner=1/(10*0.8*1.5)=0.0833W/m^2.K Rth,outer=1/(35*0.8*1.5)=0.0231W/m^2.K Like this?

Homework Statement A 0.8m high and 1.5m wide double pane window consisting of two 3mm thick layers of glass(k=0.78W/mK) is separated by a 10mm wide stagnant air space(k=0.026 W/mK). The convection heat transfer coefficients on the inner and outer surfaces of the window are 10W/m^2K and 35W/m^2K...

Homework Statement Two radioactive isotopes of singly charged plutonium(Pu-249 and Pu-244) are accelerated through a potential difference of 3.00kW and enter a uniform magnetic field of 1.50T directed perpendicular to their velocities. By performing relevat calculations, show that the ratio of...

Homework Statement Two long wires carrying current I1 and I2 in opposite directions pass through a closed path S as shown in the picture. What are the values of ∫B⋅ds and ∫E⋅ds if: i) I1=I2=1A ii) I1=1A and I2=0A? Homework Equations Ampere's Law: ∫B⋅ds=μ0I Faraday's Law: ∫E⋅ds=-dΦB/dt The...

Thanks for your reply. Do you mean I have to give the direction as well? The angles? For a), tanθ=100/5, θ=1.5° Therefore, the position is 100m 1.5° And for b), tanβ=16/5, β=1.3o Therefore, the average velocity is 5.9m/s 1.3° Like these?

Homework Statement A small ball of mass 0.50 kg is attached to a cord and perform uniform-speed circular motion of radius 2.0 m in a vertical plane. i) If the speed of the circular motion is 10m/s, determine the tension in the cord at the lowest point of the circular motion. ii)...

Homework Statement The position s (in metres) of a particle, as a function of time t (in seconds), is described by the equation s=5i+4r^2j. i and j are perpendicular unit vectors. a) Calculate the position of the particle at t=5. b) Determine the particle's average velocity between t=0 and...

I got that now! That means 2.63 t2 = 3/4∏, right? But still, the calculated t2 is 1.79, which is not 1.6 from the solution. Anything wrong?

Homework Statement One speaker is located at the origin and the other is located at (x,y)=(0,3.00m). The speakers emit identical sound waves of wavelength 2.00m which are initially in phase. Where does constructive interference occur? ANS: x=1.50m The Attempt at a Solution...

great! I understand now! Sorry for the inconvenience. I will type them out next time. Thanks for your help :D

270 degree, and why does the angle matter please?

Homework Statement Three positive charges lie on the x-axis; q1 = 15 μC is at the origin, q2 = -30 μC is at x = 2 m, and q3 = 15 μC is a x = 3 m. ( please also refer to the attachment.) Find the electric potential and electric field at point “P” aroused from q1, q2 and q3. The Attempt at...

Homework Statement A wave on a string has a wave function with the form of: y(x,t)=0.02sin(6.35x+2.63t) Find the shortest time for the displacement of the string at any point on the chain changes from 0.01m to -0.02m. The Attempt at a Solution The answer said we can set x=0. And...

For part b, can I rather use V=IR to find out the current through branches directly after finding out the total current?