Recent content by MEAHH

Hi so i have a heat transfer project to determine the material (aka the thermal conductivity) and length of a 2d wall. It has to have between -1 and 1 net rate of heat loss from the southern side and above 145 rate of heat transfer from the eastern side. The wall is 20 cm high na the boundary...

Thermo Help! Compressbility Homework Statement Ethane in a rigid vessel is to be heated from 50 psia and 100 F until its temperature is 600 F. What is the final pressure of the ethane as predicted by the compressibility chart? Homework Equations Pr=P/Pcr Tr=T/Tcr Pv=zRT The...

Thermodynamics: property tables HELP! Homework Statement 1 kg of R-134a fills a 0.14m^3 weighted piston cylinder device at a temperature of -26.4C. The container is now heated until the temp is 100C. Determine the final volume. The Attempt at a Solution So the boiling point is -26.1...

Homework Statement A radio-frequency EM plane wave propagates in the +z-direction. A student finds that her portable radio obtains the best reception of the wave when the antenna is parallel to the x--y plane making an angle of 60 degrees with respect to the y-axis . (a) Consider an instant...

Electromagnetic waves!Conceptual help please! A long steel wire is cut in half is connected to a different terminal of a light bulb. An electromagnetic(EM) plane wave (E(x,y,z,t)=Esin(kx-wt)[y hat direction], B(x,y,z,t)=Bsin(kx-wt)[z hat direction]) moves past the wire. a) Suppose the wire...

Work-Energy!Help Homework Statement An object of mass 0.550kg is lifted from the floor to a height of 3.50m at a constant speed. A) how much work is done by the lifting force? W=fdotD w=mg*d=.550*9.8/3.5=18.87J is this right B) how much work is done by the Earth on the object? this...

ok so i took the derivatives with respect to x and y d/dx=9x^2y-7 and d/dy=3x^3 what do i do now? Subtract then, this chapter in my book doesn't talk about the gradient.

conservation of forces and poetential energy! Homework Statement a potential energy function for a 2d force is of the form U=3x^3y-7x. find the force that acts at the piont (x,y). Homework Equations U=3x^3y-7x The Attempt at a Solution how do i do this? tahe the derivative?

Homework Statement A truck loaded with cannonball watermelons stops suddenly to avoid running over the edge of a washed-out bridge (see figure). The quick stop causes a number of melons to fly off the truck. One melon rolls over the edge with an initial speed vi = 10.0 m/s in the horizontal...