(a) A boy blew his rubber balloon to a spherical shape. The balloon burst when its diameter was 15 cm. Calculate, correct to the nearest whole number, the volume of air in the balloon at the point of bursting. [Take ] (b) A point X is on latitude 28°N and longitude 105°W. Y is another point on the same latitude as X but on longitude 35°E. (i) Calculate, correct to three significant figures, the distance between X and Y along latitude 28°N ; (ii) How far is X from the equator? [Take and radius of the earth = 6,400km].
Explanation
(a) (b)(i) Longitude difference : 105° + 35° = 140° Distance along the parallel of latitude = = = (ii) Distance from the equator : =