Question

a) Define i) impulse

ii) acceleration

b) Differentiate between density and relative density.

c) A bottle has a mass of 50g when empty and 112g when filled with water. When filled with fluid L, the mass is 90 g. What is the relative density of the liguid,L?

d) A student athlete of mass 62 kg participated in 200m race on sports day. During the competition, the student accelerates out of the starting block to a top speed of 14m/s in 5.0 seconds against a constant force of 70 N from a headwind. The athlete continues at this speed for the remainder of the 200 m race.

i) Calculate the acceleration of the athlete.

ii)Calculate the net forward force on his body.

iii)Calculate the power used by the athlete during the first 5.0s?

iv) Explain why the athlete might suffer from muscle fatigue?

Answer 1