Recent content by Strontium90

Homework Statement Hi, I was working on a homework problem and could not resolve it. The problem reads as follows: A ladder that weighs 240N rests against a frictionless wall at an angle of 60 degrees from the ground. A 600-N man stands on the ladder three-fourths of the distance from the...

Hmmm, wouldn't that be counterproductive? Isn't there a way to find the acceleration without the time and with the initial and final velocities?

So the Kinetic energy for any rotating object depends on it's Moment of Inertia? Taking the moment of inertia of a solid sphere and combining it with the value for translational KE, I get (9/10)MV^2 for the KE of a rolling bowling ball and soling for h in mgh = (9/10)mv^2, the value is 5.88m.

But the book has an answer for (a) of this problem. Is there some way to deduce the torque needed to accelerate the wheel? When I looked at this problem, I suspected that without the time, acceleration or displacement to the new angular velocity, there would be no way to determine the torque...

Oh and the books answer is 4.57m.

Hello, I have a problem that I have not been able to solve Homework Statement Here is the problem question: A bowling ball rolling at 8 m/s begins to move up an inclined plane. What height does it reach? Homework Equations The equation that I used was the formula relating...

Hi, I was working on a problem and I am having trouble in being able to solve this problem. The difficulty is that the question only presents not enough data to find the answers that it asks for. Homework Statement Here is the problem in it's entirety: A wheel whose moment of inertia is...

To all of you, thank you for your responses. I like the link at PASCO and the <a href="http://www.pasco.com/family/structures-systems/index.cfm"> Structures-Systems</a> kit is amazing. I will follow up on your suggestions.

Hello, I live in an area where the local university does not have any night classes. I want to restart my education and any courses in physics are not available when I am not working. I am posting this message here in order to test the feasibility of acquiring the textbooks, notes, lab...

Ugh, so the book has a typo. Ok thank you Azizlwl for the explanation and a good work out.

So was my method of solving the problem correct? Looking at the book's answer, it does not seem right. If one is going five meters a second, your velocity is high and so you need to apply a great deal of revolutions to the wheels via the pedals.

One more question, what publishers, authors or books do you recommend for learning the basics of physics Azizl? I am interested in strengthening my skills.

Azizl, would you be referring to the quotient of the radius_out / radius_in? or as it is known as the Ideal Mechanical Advantage, in terms of torque transmission? When I use that in an equation, I will get an answer of 73 revolutions per minute. The book's answer is 7.3 revs per minute. Is...

Azizlwl, would the relationship in question be v = ωr ?

The method that I used to get the answer that was the most similar to the answer in the book was this. I took the diameter of the wheel, divided it in half and came up with 2.04m for the circumference of the wheel. Then I divided the desired velocity (5 m/s) by the circumference of the wheel...