Recent content by Priscilla

Homework Statement A mountain climber has a body surface of 1.80 m2 and wears fibrous clothing 1.00 X 10-2 m thick. He has a skin temperature of 33.1 ºC while the outer surface of his clothing is at 273.15 K. Calculate the total rate of conduction of heat through his clothing in Watts, (a)...

Homework Statement The cream is kept at 5 ºC in the lorries. It is pumped into silos, where it is pre-heated before being pasteurized. The silos are jacketed, and hot water is pumped through the jacket. Assuming no losses, if 300 kg of water at 90ºC enters the jacket and exits at 60 ºC...

Thanks for your reply. Our prof gives us some hints that, we could use F=fr which is derive from the intermolecular forces: E(r) = 4e[ (s/r)^12 - (s/r)^6] s = lower case sigma => f = -dE/dr => E=fr

Anyone know how to solve this?

Homework Statement A carbohydrate gel is being centrifuged to remove excess physisorbed water. Assume that the magnitude of the attractive energy between the water molecules and the gel is given by 3.63 kJ/mol of molecules of water, with the water molecules being separated from the surface of...

Thanks a lot!

Then f_s = F_c And then I can solve for f!

o~ So, v = rw = r(2[pi]/T) f=1/T v=2[pi]rf Right?

Homework Statement A small block sits 0.15 m from the center of a horizontal turntable whose frequency of rotation can be smoothly increased. If the coefficient of static friction between the block and the turntable is 0.55, at what frequency will the block begin to slide off? (Draw a force...

Thanks!

W = MgH + (u_k Mg cos [0] H)/ (sin[0])?

For a) Tension on the inclined plane = Mg sin [0] Distance of the inclined plane = H/ sin[0] W = Fd = Td = (Mg sin[0]) (H/ sin[0]) = MgH For b) f_k = u_k N N = Mg cos [0] F = u_k Mg cos [0] W = Fd d = H/sin[0] W = (u_k Mg cos [0] H)/ (sin[0]) Are they correct?

Homework Statement A mass M is hauled from ground level up an inclined plane that makes an angle 0 with the horizontal by means of a rope passing over a frictionless pulley. The mass is pulled along until it reaches a height of H. The building of the Egyptian pyramids and many other ancient...

Second part

I resized them.