Question

A bird of mass $0.1kg$ rising vertically with an acceleration of $0.2m{s}^{-2}$.The muscular force exerted by it is $(g=9.8m{s}^{-2})$

a. $1N$ b. $9.8kg-wt$

c. $\frac{1}{9.8}kg-wt$ d. $980N$

• A. a & d are correct
• B. a & b are correct
• C. a & c are correct
• D. b & d are correct

Answer 1

Answer: (C)

a & c are correct

Given,

$a=0.2m{s}^2$

$m=0.1kg$

$g=9.8m/s^2$

The muscular force exerted by the bird is given by

$F=m(a+g)$

$F=0.1(0.2+9.8)=1N$

And,

$1kg-weight=9.8N$

Hence, $1N=\frac{1}{9.8}kg-wt$

The correct option is C.