Recent content by joe_

Homework Statement A man pushes on a piano with mass 180 kg so that it slides at constant velocity down a ramp that is inclined at 11deg above the horizontal floor. Neglect any friction acting on the piano. Calculate the magnitude of the force applied by the man if he pushes (a) parallel to...

Got it. My mix ups were not taking the distance correctly, a math error, and then finally not re-looking at what was affected by that math error. Thanks much, solved! -181.8J

Er, math error on the theorem. Should be 50.99 = 51. I must have just looked at it quick. And when I am taking the angle between the vectors I was going the "long way" through the first and second quadrants to get there. Should I always go the shortest way? If I go the shortest way...

I'm not familiar with the dot product method at all? Also, I think between my last question and my mess up concerning taking the angle from the coordinate axis I found my errors. I'm ALWAYS taking stuff from the axis, and not between the displacement and force. Figuring that out is helping a...

I know this may also be semi off topic, but say something is thrown vertically upwards and the formula reads w = f s cos\alpha So w will always = 0 because the cos of 90 is 0 Or am I doing that wrong?

Oh yes, w=f s cos\alpha So I have to also find the direction of the displacement and take the cos of it. So I would have to do -8.6 / 9.11 (adj/hyp = cos \alpha) -.944 invcos 19.26 deg. so w= f s cos 19.26?

Homework Statement http://img361.imageshack.us/img361/7372/87516919cu1.th.jpg Homework Equations \sqrt{}a2+b2 = c w = f s The Attempt at a Solution Pythagoreoms theorem on -8.6 m and -3.0 m to find the distance traveled = 9.11m Pythagoreoms theorem on 34 N and -38 N to find total force = 60...