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Question
Find the acceleration of the 500 g block in the following figure.
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Solution
Given:
m1 = 100 g = 0.1 kg
m2 = 500 g = 0.5 kg
m3 = 50 g = 0.05 kg
The free-body diagram for the system is shown below:
From the free-body diagram of the 500 g block,
T + 0.5a − 0.5g = 0 ...(i)
From the free-body diagram of the 50 g block,
T1 + 0.05g − 0.05a = a ...(ii)
From the free-body diagram of the 100 g block,
T1 + 0.1a − T + 0.5g = 0 ...(iii)
From equation (ii),
T1 = 0.05g + 0.05a ...(iv)
From equation (i),
T1 = 0.5g − 0.5a ...(v)
Equation (iii) becomes
T1 + 0.1a − T + 0.05g = 0
From equations (iv) and (v), we get:
0.05g + 0.05a + 0.1a − 0.5g + 0.5a + 0.05g = 0
0.65a = 0.4 g
\[\Rightarrow a = \frac{0 . 4}{0 . 65}g\]
\[ = \frac{40}{65}g = \frac{8}{13}g \left(\text{ downward }\right)\]
So, the acceleration of the 500 gm block is
\[\frac{8g}{13}\] downward.
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