A screw gauge has pitch 1 mm and 100 circular divisions. Wire diameter reading is 1 mm + 47 circular divisions; wire length is 5.6 cm. If curved surface area in cm² is A with correct significant figures, find 10 A.

Question

G1 Physics · Accepted Answer

LC=1/100=0.01 mm. Diameter=1+47×0.01=1.47 mm=0.147 cm. Curved area A=πdL=π×0.147×5.6≈2.59 cm². Therefore 10 A≈25.9, rounded to the requested integer 26.