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Q.

A mass of 10 kg is suspended from a spring balance.  It is pulled aside by a horizontal string so that it makes an angle of 60° with the vertical. The new reading of the balance is

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a

203 kgwt

b

103 kgwt

c

10 kgwt

d

20 kgwt

answer is C.

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Detailed Solution

Question Image











By Lami' s theorem,
Tsin ⁡90∘=10kgwtsin ⁡150∘ or T=10sin ⁡30∘=20kgwt

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A mass of 10 kg is suspended from a spring balance.  It is pulled aside by a horizontal string so that it makes an angle of 60° with the vertical. The new reading of the balance is