JAMB - Physics (1993 - No. 4)
A rocket burns fuel at the rate of 10kgs-1 and ejects it with velocity of 5 x 103ms-1. The thrust exerted by the gas on the rock is
2.5 x 107N
5.0 x 104N
5.0 x 102N
2.0 x 10-3N
คำอธิบาย
Thrust = \(\frac{\text{mass x velocity}}{time}\)
= 10 x 5 x 103
= 5.0 x 104N
= 10 x 5 x 103
= 5.0 x 104N