Recent content by Tycho

a block of mass 10kg is attached to a spring with a constant of 1850 N/m. the coefficient of sliding friction between the block and the surface is .25 the block is pulled back 11 cm to the right and released. the question asks the speed at different points, and how far the distance after...

I'm not quite sure how to get started on this problem... a baseball is struck by a bat, and 3 seconds later it is caught 30m away. now the questions ask for it's final velocity, it's angle as it left the bat, the greatest height it reached, and the X and Y components of it's velocity as...

This is what i thought at first, but it is scaring me a little more then usual, especially since we JUST covered this in class. I'm with you, though. i don't see how the stupid cylinder would make a difference, lol. it just seems like the only purpose it would serve would be to avoid making an...

you need the diameter to find the cross-sectional area of the cable. i understand all that, but i need the strain when it is slowing. i got the strain when it was moving at a constant velocity (i think). does anyone know how to figure this?

A 1260kg freight elevator is supported by a steel cable of diameter 34.9mm. It is loaded with a crowd of people collectively having a mass of 2850kg and it is descending. What is the strain in the cable when it is brought to a stop in 0.600s? I'm not really sure how to figure in the fact...

In a bourbon distillery plant, the refined product, approximated as 40% by weight ethanol, 60% by weight water, is pumped through a plumbing system. At the OUTLET, where the inner diameter of the pipe is 5.08cm, the product fills an aluminum open cylinder (Diameter .442m, height 1.26m) in 98.9...

you're going to have to put these two things together for me. how would i put this summation of forces into the equaition for strain?? therein is my biggest problem!

lol okay, so what next? gauge pressure will = absolute pressure? what is the absolute pressure?

thanks! I was missing Q. that solved THAT problem! okay so gauge pressure is absolute pressure - atmospheric pressure. since atmospheric pressure should be approximately = to 1, then it is absolute pressure -1? how do you find absolute pressure?

I saw what you did in the last one. Area=pi * R^2. you used the diameter instead of the radius. Welcome to the physics forum! this is my second month on. do you know how to take the speed of the lift into effect?

It says it is 3.85m ABOVE the cylinder

A= pi * dia ^2 / 4 = 9.566 ^ -4 ?? shouldn't it be: A= pi * 34.9mm^2 / 4 = 956mm = .956m ? stress = F/A = 4.21 * 10^4 Pa ? Young's modulus = stress/strain strain = stress / young's strain = 4.21*10^4 / 20*10^10 = 2.105 * 10 ^ 13 ?? or did i screw it up again?

Bernoulli's eqn okay, i started to write it out, but with all the subscripts and superscripts, it was looking NARSTY! Any way you could start me out on it? I'm still drawing a blank. btw, thanks for ALL of your assistance. you've been really nice and extremely helpful :smile:

oops! haha i knew that! Strain = 2.11*10^13 That's more like it, but is it right? And what about the speed of the elevator? If this is the answer to part a, then how do i solve for b?

Wow, this went way over my head! lol. Is this the derivation of the relationship you were talking about? If so, then (since it looks unfamiliar) i would assume this isn't wasn't what my instructor was looking for?