Physics · Measurements
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Name the quantity which can be measured by using the base unit kgm2s-3:
- A
Weight
- B
Pressure
- C
Power
- D
Work
The following is the solution:
As we know that:
Power = Work / time
And,
Work = force × distance
F = ma
So putting all that together:
P = m × a × d / t
Substituting with their units that would make:
P = kgm²s-3
Weight is measured in newtons (N), which is kgms-2. It does not match the given base units.
Pressure is measured in pascals (Pa), which is kgm-1s-2. This is different from the given base units.
Power is measured in watts (W), which is kgm2s-3. This matches the given base units.
Work is measured in joules (J), which is kgm2s-2. This does not match the given base units.
Tagged under Physics · Measurements · 2013