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Physics

Convert the following.

(a) 250 km to m

(b) 400 m2 to cm2

(c) 5000 kg to tonnes

(d) 20 cm to mm

(e) 2 solar days to seconds

Measurements

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Answer

(a) As,

1 km = 1000 m

Then

250 km = 250 x 1 km = 250 x 1000 = 250000 m

(b) As, 1 m = 100 cm

Then

1 m2 = 1 m x 1 m = 100 cm x 100 cm = 104 cm2

Now,

400 m2 = 400 x 1 m2 = 400 x 104 cm2

(c) As, 1 tonne = 1000 kg

⇒1 kg=11000 tonne⇒5000 kg=5000×11000 tonne=50001000 tonne=51 tonne=5 tonne\Rightarrow 1 \text { kg} = \dfrac{1}{1000} \text { tonne} \\[1em] \Rightarrow 5000 \text { kg} = 5000 \times \dfrac{1}{1000} \text { tonne} \\[1em] =\dfrac{5000}{1000} \text { tonne} \\[1em] = \dfrac{5}{1} \text { tonne} \\[1em] = 5 \text { tonne}

(d) As, 1 cm = 10 mm

Then

20 cm = 20 x 1 cm = 20 x 10 mm = 200 mm

(e) As,

1 Solar day = 86400 seconds

Then

2 Solar days = 2 x 1 Solar day = 2 x 86400 seconds = 172800 seconds

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