Recent content by smray7

Homework Statement 50g copper calorimeter contains 250g of water @ 20 degrees C. how much steam must be condensed into water if the final temp. of system is 50 degrees C? Homework Equations MwCw(T-Tw) = -MxCx(T-Tx) The Attempt at a Solution I converted grams to kg and celsius to kelvins...

ok thanks, that's clears things a little. on another problem i have to determine the pressure on wing two. airplane mass: 1.60 x 10^4 wing one area : 40m^2 wing two area : 40m^2 pressure on wing one : 7.00 x 10^4 pressure on wing 2: ? F= PA mg = P1A1 + P2A2 mg = A(P1 + P2) mg -P1...

Homework Statement water flows into a tube with a diameter of 6.35 cm at 0.012 meters cubed per sec. it exits the nozzle with a diameter of 2.2cm at what speed? Homework Equations a = pi r squared A1V1 = A2V2 The Attempt at a Solution My question is should i convert the cm to...

thanks t.t.! i got it. i do have another question on a problem involving a rotating disk. how do i relate \tau = I\alpha to F = \mu\muN ? i need to find \mu as a force of 70N is applied to the disk. all work for torque i have is completed. i just need to do the above.

ok so maybe i was over thinking it and misreading it. Newtons are forces not mass. and you're right, what i had before doesn't equal to zero. now i have: Fy: N1 + N2 - mg = 0 T: N1(2) - mg(2-x) + N2(0) = 0 this seems simple but i don't know, i can't get it.

Homework Statement A light plank 2 meters long rests on two scales with a girl laying across the plank. The mass on the left(head) is 380N and at the other end(feet), the mass is 320N. How far from the girl's feet is the center of mas? Homework Equations net F = 0 net T = 0 because...