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## Homework Statement

Homework Statement [/b]

am i right? please help me .. thnx

Homework Statement

the blocks shown in the figure are connected by flexible, inextensible cords passing over frictionless pulleys. at A, the coefficient fiction is 0.30 while at B, it is 0.40. compute the magnitude and direction of the friction forces and each block.

## Homework Equations

for block A=

T-mgsin53.13-Fmax=0

Fmax=0.3(300cos53.13)

for block B=

T-mgsin36.87-Fmax=0

Fmax=0.40(200cos36.87)

## The Attempt at a Solution

for A:

Fmax=μk(m1)gcos53.13

54=μk(m1)gcos53.13

μk=0.03

T-300(9.81)sin53.13-μk(300)9.81cos53.13=(300)a eq(1)

200g-T=200a eq(2)

subtitute (1) and (2) to find a

a=-3.79

for block B:

Fmax=μk(m2)gcos36.87

64=μk(m2)gcos36.87

μk=0.04

T-200(9.81)sin36.87-μk(200)9.81cos36.87=(200)a eq(1)

300g-T=300a eq(2)

subtitute (1) and (2)

to find a

a=0.2

AM i DOiNG RiGHT ?? please comment .. im lack of knowledge ..