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  2. Fill in the blanks by suitable conversion of units (a) 1 kg m2 s–2 = ....g cm2 s–2 (b) 1 m = ..... ly
# NCERT

Q 2.2: Fill in the blanks by suitable conversion of units

(a) 1 kg m^2s^-^2 = \ \ \ \ \ \ \ \ gcm^2s^-^2

b) 1 m = \ \ \ \ ly

(c) 3.0 \ m s^-^2 = \ \ \ \ km h^-^2

(d)G = 6.67 \times 10^{-11} Nm^2(kg)^-^2 = \ \ \ \ \ (cm)^3 s^{-2}g^{-1}.

Answers (1)
S safeer

(a) (1 kg \rightarrow 1000g ;\ 1m\rightarrow 100 cm)

            1 kgm^2s^{-2} = (1000g)(100cm)^2s^{-2} = (10^3 \times10^{4})gcm^2s^{-2} = 10^{7}\ gcm^2s^{-2}

(b) 1 m = 1.057\times10^{-16} ly   (1 ly = Distance travelled by light in 1 year )

(c) (1 m \rightarrow 10^{-3}km ;\ (60\times60 =) 3600 s \rightarrow 1hr)

        \\3.0 ms^{-2} = 3.0 (10^{-3}km)(1/3600 hr)^{-2} = 3.0 \times (3600)^2 / 1000\ kmhr^{-2} \\ = 3.9 \times 10^4 \ kmhr^{-2}

(d)    (N \rightarrow J.s = kgms^{-2};\ 1 m \rightarrow 100cm;\ 1 kg\rightarrow 1000g)

    G = 6.67 \times 10^{-11} (kgms^{-2})m^2kg^-^2 = (6.67 \times 10^{-11})(m)^3 s^{-2}kg^{-1} = 6.67 \times 10^{-8}cm^3 s^{-2}g^{-1}

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