An athlete runs 1 1

2

laps around a circular track of radius 20 m in 0.83 minutes. All

questions must be answered with correct SI unit and significant figures. Determine

a) The distance covered by the athlete (3)

b) The displacement of the runner (3)

c) The speed and velocity of the runner. (4)​

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?