The system is in equilibrium if the spring balance is calibrated in newton what does it record in each case

Explanation

(a) one weight acts as support another acts as weight
So tension T=10g =10`xx 10`
T= 100N
(b) `T= 2xx 10xx g`
`=2 xx 10xx 10 = 200N`
(c ) `T = 10 xx 10 sin 30^(@)`
`=10 xx 10 xx (1)/(2) = 50N`