1) use dimensional analysis to determine which of the following expressions gives the area of a circle: is it pie r ^2, or 2 pie r? explain

Question

- pie r^2 right?? because its what they normally use to find area of a circle

2) If a distance d has units of meters and a time T has units of sec, does the quantity T+d make sense physically?? what about the quantity d/T? explain in both cases

- ?? I don't know

Answer 1

1. Area = pi*r^2.

2. You cannot add time and distance, but
you can divide:

V = d/T or distance per unit of time.