Recent content by Footballer010

Homework Statement A frictionless ramp of mass 3m is initially at rest on a horizontal frictionless floor. A small box of mass m is placed at the top of the ramp and then released from rest. After the box is released, it slides down the ramp and onto the horizontal floor, where it is...

If it helps... the answer is 2.9 m, but I have no idea why.

Homework Statement A man is standing at one end of a plank of length L = 10 m. The man has mass Mman = 100 kg and the plank has mass Mplank = 40 kg and the plank is atop a frictionless sheet of ice. At the other end of the plank sits a large rock of mass Mrock = 200 kg. The center of mass of...

The fractional value is \frac{100}{11}, but from the answers choices... b. 9 times is the closest. Thanks for the help.

ok thanks, I got 9, but how would I set up the problem? mgh=xukmgh? where x equals the number of times the block crosses the section that right?

Homework Statement A block of mass m is initially held in place on the left side of a track at a distance h above the bottom of the track. The track is completely frictionless, with the exception of a rough horizontal section of track of length h which has a coefficient of kinetic friction μ...

I just got it... 6\intu^{5}/(u^{2}(u-1))du. Then I simplified and used long division to get a long complicated answer, but its right. Thank you both!

Hmm...I entered the integral into my calc and its not even close to what I got. This makes no sense!

u=x^{1/6} so u^{6}=x du=((u^{6})^{-5/6})/6 dx So, du=(u^{-5})/6 dx Now what?

So du=\frac{x^{-5/6}}{6}. Now I'm lost again.

I used integration by parts and got \frac{1}{u^{2}(u-1)}=\frac{-1}{u}-\frac{1}{u^{2}}+\frac{1}{u-1}. Is this right?

Homework Statement \int\frac{dx}{x^{1/2}-x^{1/3}} Homework Equations None The Attempt at a Solution What I did was replace \int\frac{dx}{x^{1/2}-x^{1/3}} with \int\frac{dx}{u^{3}-u^{2}} if u=x^{1/6}. Just to simplify things. And I think that was pointless. Help me out?

Hello. I'm having problems with one thermodynamics. I've used several equations but I'm still unable to get the right answer. A push in the right direction would be helpful. Thanks. Consider a process involving 1 mole of an ideal gas that takes place by the following pathway, at a...