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k = constant of variation
1. The circumference of a circle (C) varies directly as the radius of the circle (r).
c = kr
2. The centrifugal force (c) is inversely proportional to the radius (r) of the
circular path and directly proportional to the square of the velocity (v) of the
moving body.
c = kv²/r
3. The heat (H) generated by an electric stove varies jointly as the square of the current (c) and the resistance (r).
H = kc²r
4. The intensity of illumination (I) on a book varies inversely as the square of
the distance (d) from the source of light.
I = k/d²
5. The distance (S) a body falls varies directly as the square of the time (t) after it starts to fall.
S = kt²