Question

17. The diameter of a football is approximately 20/19 of the diameter of a volleyball. What is the ratio of
their surface areas?​

Answer 1

Step-by-step explanation:

A body of mass m moving with certain velocity v collides with another identical body at rest . if the collision is perfectly elastic and after the collision

Answer 2

Answer:

400:361

Step-by-step explanation:

Given,

Ratio of the diameters of the football and the volleyball is 20:19.

Therefore, D:d = 20:19 [where (D) and (d) are the diameters of the respective circles]

or 2R:2r = 20:19 [where (R) and (r) are the radiuses of the two circles respectively]

or R:r = 20:19

Let, R be 20x and r be 19x

or 4πR² : 4πr² = 4π(20x)² : 4π(19x)²

or R²:r² = (20x)² : (19x)²

or R²:r² = 400x² : 361x²

or R²:r² = 400 : 361