Recent content by juggalomike

Homework Statement Air at 300K(=T_s) flows over a flat plate maintained at 400K(=T_f). At a particular location on the plate, the temperature distribution in the air measure from the plate surface is given by T(y)=(T_s-T_f)exp[-22,000*y(m)]+T_f Q.Determine the conduction heat flux through...

Thanks a lot, knew it wasn't a hard question was just stuck on the sub part.

Homework Statement A gas is trapped in a cylinder-piston arrangement. The initial pressure and volume are 13,789.5 Pa and 0.02832 m^3. Determine the work(kj) assuming that the volume is increased to 0.08496 m^3 in a polytropic process with n=1. Homework Equations m_1-2=∫PdV from 1 to...

Homework Statement An 80 watt light bulb has a current of .5A running through it. What is the charge through the lightbulb after 1 hour? Homework Equations i=Q/T The Attempt at a Solution For this question is the wattage irrelevant because we know current and time? We would...

ahhh, it will be 1/2 of the original, thanks.

Homework Statement A cylindrical copper rod of length L and cross-sectional area A is re-formed to twice its original length with no change in volume. If the resistance between its ends was originally R, what is it now? Homework Equations R=p(L/A) The Attempt at a Solution Using...

id assume surface, what is corssection?

Homework Statement Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 8.60 cm-3 and their speed is about 490 km/s. (a) Find the current density of these protons. 6.74E-7 A/m^2 (b) If Earth's magnetic field did not deflect the protons, what total...

Yep lol, thanks, my answer was correct except for the conversion

Homework Statement The plates of a spherical capacitor have radii 31.0 mm and 43.0 mm. What must be the plate area of a parallel-plate capacitor with the same plate separation and capacitance of 12.4pFHomework Equations C=(epsilon*A)/dThe Attempt at a Solution...

Ah your right, thanks, correct answer was 2.86E-5

Homework Statement In Figure (a), an electron is shot directly away from a uniformly charged plastic sheet, at a speed of vs = 2.00 106 m/s. The sheet is nonconducting, flat, and very large. Figure (b) gives the electron's vertical velocity component v versus time t until the return to the...

Never mind, my answer was correct but the system wasn't accepting the format i was inputting it as(which is ironically the format they fed the information to me in)

Homework Statement at some instant the velocity components of an electron moving between two charged parallel plates are vx = 1.20 105 m/s and vy = 3.70 103 m/s. Suppose that the electric field between the plates is given by Evec = (120 N/C) jhat. (a) What is the electron's acceleration...

Homework Statement A crane is used to lift a concrete pipe weighing 5kN into place. Homework Equations The Attempt at a Solution The picture is in my book, but i am certain my problem is in my algebra(i have the layout correct) T_ac*cos(20)=T_ab*sin(3.58) X direction...