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pezzang

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Two blocks with masses of 4kg and 8kg are connected by a string and slide down a 30 degree inclined plane. The coefficient of kinetic friction between 4kg block and the plane is 0.2; that between 8kg block and the palne is 0.35.

A) calculate the acceleration of each block.

b) calculate teh tension in the string

c) what happens if the positions of the blocks are reversed, so the 4kg block is above teh 8kg block?

picture

4kg ------- 8kg

the inclination goes up as it goes right so

8kg

------

---

4kg-

Like that.

I assumed that the acceleration of block a and b are teh same. can i assume that? and i soloved it using ma equals w times sin30 - uwcos30 - T

and Ma = mg sin20 - .25 times mg cos30 - T

and so on,. I got 2.21 as the accelration. can anybody confirm and tell me how they got it? and for the rest too?

Thanks.

A) calculate the acceleration of each block.

b) calculate teh tension in the string

c) what happens if the positions of the blocks are reversed, so the 4kg block is above teh 8kg block?

picture

4kg ------- 8kg

the inclination goes up as it goes right so

8kg

------

---

4kg-

Like that.

I assumed that the acceleration of block a and b are teh same. can i assume that? and i soloved it using ma equals w times sin30 - uwcos30 - T

and Ma = mg sin20 - .25 times mg cos30 - T

and so on,. I got 2.21 as the accelration. can anybody confirm and tell me how they got it? and for the rest too?

Thanks.

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