The edge of a cube is increasing at a rate of 7 cm/s. The current side length is 3 cm.
Surface Area of a cube is given by:
A=6a2
where a is the side of the cube.
Differentiating both sides with respect to time:
dtdA=6×2a×dtda
dtdA=12a×dtda
Given:
a=3 cm
dtda=7 cm/s
Substituting these values:
dtdA=12×3×7
dtdA=36×7
dtdA=252 cm²/s
Therefore, the rate of change of surface area of the cube is 252 cm²/s.