Question 169: Laws of Motion

Question

A system to 10 balls each of mass 2 kg are connected via massless and unstretchable string. The system is allowed to slip over the edge of a smooth table as shown in figure. Tension on the string between the 7th and 8th ball is __________ N when 6th ball just leaves the table.

Accepted Answer

At given instant
$${a_{sys}} = {{6\,m 	imes g} \over {10\,m}} = {{6\,g} \over {10}}$$
$$	herefore$$ $${T_{78}} = (3m) 	imes {a_{sys}}$$
$$ = (3m) 	imes \left( {{{6g} \over {10}}} ight)$$
$$ = {{3 	imes 2 	imes 6 	imes 10} \over {10}} = 36\,N$$

Laws of Motion

A system to 10 balls each of mass 2 kg are connected via massless and unstretchable string. The system is allowed to slip over the edge of a smooth table as shown in figure. Tension on the string between the 7th and 8th ball is __________ N when 6th ball just leaves the table.

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