Recent content by ankurb

Your value of Vf is incorrect, probably because you left the term 'm' in your equation. Also, 'gh' shouldn't be there in the RHS, because the diagram clearly shows them at the same level. Using mgh = 1/2 m v^2 (because initially, it has only potential energy, before going off ramp, only...

Solved I agree, taking the derivative is easier. dm / d(theta), when equated to zero, gives tan(theta) = \mu, so \mu = atan .35, giving \theta = 19.3 degrees. Substituting in the expression for mass, the value of the highest mass that can be pulled comes out to be 340 kg.

Solved Oh. Right! I thought we were only supposed to consider the vertical force due to normal reaction. If I factor in the force exerted by the motorcycle to go up the incline, then I get the answer. -mg sin theta + F = ma or, F = m(g sin theta + a) = 60 x (9.8 sin 10 deg + 3) = 282 N...

You need to substitute -g for acceleration, since the 'direction' of g is downwards.

Homework Statement A motorcycle and 60.0 kg rider accelerate at 3.0 m/s^2 up a ramp inclined 10 degrees above the horizontal. (a) What is the magnitude of the net force acting on the rider? (b) What is the magnitude of the force on the rider from the motorcycle? Homework Equations Net...

The question also gave a hint - to look at the solution for the session opener question of the chapter; which is basically about calculating the Earth's radius the way you mentioned, i.e., measuring the time difference in sunsets if a person stands up. So, I read your stuff, sat down to make a...

There WAS one more paragraph, in between the two I wrote here, but I omitted that because of no significance - it was simply a history of prominent mesospheric cloud appearances. You know, R&H does give a lot of extra tidbits of information (I like that, BTW).

Homework Statement Homework Equations theta = length / radius The Attempt at a Solution I came across this question in Fundamentals of Physics (Resnick / Halliday / Walker), in the chapter Measurement. Now I understand that this is a simple geometry-based question. Basically, the '38...