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Base and derived units
Chapter: Measurements (Physics)
Institute: Habib Girls’ School
Q.1 Derive the following derived quantities in terms of their base
quantities and base units.
1. Momentum: mass x velocity
= mass x distance/time
= mass x length/time
= kg x m/s
= kgms-1
2. Energy: power x time
= work/time x time
= force x distance
= N x m = J (joule)
3. Power: work/time
=force x displacement/ time
=N x m / s
=J/ s = Js
-1
= watt
4. Pressure: Force/area
= N /m
2
= Pa
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Q.2 The density of seawater is 1.05 g/cm3. Express this density in
kg/m3.
= 1.05 g/cm
3
= 1.05 x 10
-3
kg/ (1x 10
-2
)
3
m
3
= 1.05 x 10
-3
kg/ 1 x 10
-6
m
3
= 1.05 x 10
-3
x 10
6
kg/m
3
= 1.05 x 10
3
kg/m
3
(scientific notation)
= 1050 kg/m
3
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Base and derived units Chapter: Measurements (Physics) Institute: Habib Girls’ School Q.1 Derive the following derived quantities in terms of their base quantities and base units. 1. Momentum: mass x velocity = mass x distance/time = mass x length/time = kg x m/s = kgms-1 2. Energy: power x time = work/time x time = force x distance = N x m = J (joule) 3. Power: work/time =force x displacement/ time =N x m / s =J/ s = Js-1 = watt 4. Pressure: Force/area = N /m2 = Pa Q.2 The density of seawater is 1.05 g/cm3. Express this density in kg/m3. = 1.05 g/cm3 = 1.05 x 10-3 kg/ (1x 10-2)3 m3 = 1.05 x 10-3 kg/ 1 x 10-6 m3 = 1.05 x 10-3 x 106 kg/m3 = 1.05 x 103 kg/m3 (scientific notation) = 1050 kg/m3 Name: Description: ...
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