Recent content by monkeysmine

Yeah, I meant my original thought was cos(theta) for some reason I kept writing sin. It was probably just kind of late. Apparently Webassign demanded that we round and truncate making the answer 4cos(theta) (shady if you ask me) but hey.

...Okay sorry I don't know what I was thinking yesterday I meant I tried cos(theta) and cos(90-theta)...

3.773 = .5 * 1.1 * .7 * 9.8, so actually, I don't understand why you are saying my answers are incorrect.

I got T = 3.8cos(90-theta) as a replacement to 3.9sin(theta). I just used my last "guesses" on this problem though, so I will talk to my teacher tomorrow about it. I am positive that one of my 50 answers were right (30+ variations on rounding and truncating) of 3.773cos(90-theta) and I also...

Well I double checked my work on a calculator and I'm positive that my cross product was right. I did realize that an error I made was that R is actually r/2 since r goes from the pivot to the center of mass, but this still does not give me the correct answer.

I only tried 2) because 1) did not work. I crossed .5Lcos(theta)i - .5Lsin(theta)j + 0k with 0i -mgj + 0k

Homework Statement A uniform rod 1.1 m long with mass 0.7 kg is pivoted at one end, as shown in Fig. 9-46, and released from a horizontal position. Find the torque about the pivot exerted by the force of gravity as a function of the angle that the rod makes with the horizontal direction. (Use...

Oh! Whoops my bad! Thanks so much for your help, by the way! Much Appreciated :D

Um which details are faulty?

Ah.. the five-day weekend has completely crippled my brain :( I think I meant .00545, which is the moles of hydrogen produced from PV=nRT (762mmhg)(.1315L)/(62.4mmhg*L/moles*K)(294.4K). I obtained .1315L as the amount of H2 produced, since volume water displaced = volume h2 produced...

Ummm... Would (.1229-x gZn)(1mol/65.4gZn)(1/1) = 4.54 (x gAl)(1mol/27.0gAl)(3/2) = 4.54 be the right equations?

Zn + HCl -> ZnCl2 + H2 Al + HCl -> AlCl3 + H2 if all I can think of..? But I don't know how to calculate the amount of hydrogen produced. I know the hydrochloric must be the limiting reagent, to ensure complete reaction, but further than that, I'm stumped.

Homework Statement The purpose of the lab is to determine the % comp of an alloy from the volume of hydrogen that is produced in the reaction. We did a lab, in which an alloy was reacted with hydrochloric acid, in a test tube with a stopper and tube leading to a 500ml sidearm flask, with a...