The heat developed in an electric wire varies jointly as the resistance of the wire, the time the current is flowing and the square of the current. find the percentage change in the heat developed if the resistance remains constant, the current is reduced by 50% and the time of current flow is increased 50%.

4 puzzles in 3 hours

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

no idea

step-by-step explanation: