Question

answer this questions fast ​

Answer 1

18) 'R' is directly proportional to 'l'

$\:\:\:\:\:\:\:\:\:\:\frac{ R_{1} }{ R_{2} } = \frac{ l_{1} }{l_{2}}=> \frac{ 10 }{ R_{2} } = \frac{ 100}{ 125 } \: \: \: \: \: \: \: \: \: \: \: \: \\ R_{2} = 12.5 \: ohms\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$

19) P = W/t = mgh/t

5000 = (m × 9.8× 10)/(5×60)

m = (5000 × 300)/98

m = 15306.12 kg