MHF has a partner site, Physics Help Forum. If you are particularly interested in this subject, come check it out!
Physics Help Forum
MHF has a partner site, Physics Help Forum. If you are particularly interested in this subject, come check it out!
Physics Help Forum
I have an account but I can't permanently log in. And I know that I'm using the correct password because it does momentarily log me in and shows the message "Thank you for logging in, Mr Rayon". However, it then sends me to a page where I am not logged in.
A book, which may be modelled as a particle of weight 8N rests in equilibrium on a desk top inclined at 28 degree to the horizontal. ind the frictional force acting on the book. he coefficients of friction between the book and the desk top is 0.6. Determine whether the equilibrium is limiting.
F= 8 sin 28x.6= 3.75 ( parallel)
R= 8 cos(28)= 4.5
Answer given is 3.76N and friction is not limiting. may I know why friction is not limiting? Please explain
$\displaystyle f_s = mg\sin{\theta} = 8\sin(28) = 3.76 \, N$
$\displaystyle f_{s \, max} = \mu_s \cdot N = 0.6 \cdot 8\cos(28) = 4.24 \, N$
do not piggy-back new questions on an old thread ... next time, start a new physics thread in the Math Topics forum.
It's too late for this comment for most users but the Physics and Chem sites are down until the owner comes back and resuscitates them. I don't recall if we have a Biology forum or if it was in the planning stages. But if we did that's down too. we're focusing on the Math site at the moment.
-Dan
Hi,
Back in old days (18-19th centuries and older) math was being developed the way the physicians needed it, not more. Suppose one day a phisician needed to solve quadratic equation and there was no way to do it. He would sit days long and finally invent a method for solve this kind of equations (in reality things were a bit different, but not much). So in the process of solving a physical problem new mathematical method was developed and the physical problem got solved too. This way physics benefited from maths and maths from physics.
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