Physics
JAMB 2015
At what respective value of a, b, and c would the unit of work, the joule, be dimensionally similar to M
a L
b T
c?
Correct Answer: Option B
Explanation
Work (w) = Force (f) × Distance (d)
Note: f = ma = mass × acceleration
= mass ×acceleration ×distance
= kg ×ms
–2 × m
= kg m2 5
–2
(Note: the dimension of kg = M, M = L & S = T)
Work = ML2 T–2 = Ma Lb Tc
i.e. Ma Lb Tc = as 1, b = 2, c = –2
The value of a, band c = 1, 2, –2
There is an explanation video available below.
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