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- Thread starter robobot4
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hotvette

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Diane_

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I take it you're asking how to solve a problem where you have to find the angle? The trouble is that you haven't provided enough information to do so. If we knew the acceleration of the blocks, then we could make a start - otherwise, the system is underdetermined.

Some general hints: in problems like this, it's always a good idea to start with a free-body diagram of each of the masses. List every force acting on each mass, including the direction. Decide on a convenient set of axes and resolve the forces into their appropriate components.

For instance, the forces on your block 1 will be weight (straight down), the normal force (perpendicular to the plane, upwards), friction (parallel to the plane, towards the bottom) and the tension in the rope (parallel to the plane, towards the top). Given this, the best axes are probably parallel to and normal to the plane. For your block 2, the only forces are the weight (down) and the tension in the rope (up), so there's no resolution necessary.

After that, it's a matter of resolving everything. Remember that the net force on the object is both the vector sum of the forces acting and the product of mass and acceleration. If you know the acceleration, then you can figure the net force pretty easily. From there, it's a relatively simple matter to determine the angle necessary to give you that net force.

Does that help?

- #4

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(45 - (.620)(130))/ (4.591 + 13.26)....and this yielded an accelleration of 2 m/s^2. Would that enable me to solve my problem with this information???

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Diane_

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What problem are you trying to solve? What information (other than the masses and the coefficient of friction) do you have?

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A block weighing 130 N is on an incline. It is held back by a weight of 45 N hanging from a chord that passes over a frictionless pulley and is attached to a block as shown below [seen in the site]. Find the angle (Theta) at which the block will slide down the plane at constant speed. The coefficient of friction is 0.620

for the record, I have no idea how i managed to get 2 m/s^2, I think I plugged it into some odd formula in my physics book

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- #8

Diane_

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Is that enough?

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Diane_

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It can really be a blast, I promise you. And I say that as a girl who majored in mathematics. :)

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