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4-1.Newton's Laws of Motion
medium

બ્લોક $ B$  પર તંત્રને સમતોલનમાં રાખવા માટે $mg $ બળ લગાવવામાં આવે છે,તો ${T_1}$= _____

A

$mg$

B

$\sqrt 2 \,mg$

C

$\sqrt 3 \,mg$

D

$\sqrt 5 \,mg$

Solution

${T_1}\cos {\theta _1} = mg$……(i)

${T_1}\sin {\theta _1} = – mg$…..(ii)

$T_1^2\left( {{{\sin }^2}{\theta _1} + {{\cos }^2}{\theta _1}} \right) = 2{\left( {mg} \right)^2}$

$\therefore $ ${T_1} = \sqrt 2 mg$

Standard 11
Physics

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