How long will John take to make a round of a circular field of radius 21 m cycling at the speed of 8 km/hr?

How long will sound take to travel in (a) an iron rail and (b) air, both 3.3 km in length ? Take speed of sound in air to be 330 m s^(-1) and in iron to be 5280 m s^(-1) .

A rectangular field is measured 290 m by 210 m. How long will it take for a girl to go two times round the field, if she walks at the rate of 1. 5\ m//s e c ?

A satellite X moves round the earth in a circular orbit of radius R . If another satellite Y of the same mass moves round the earth in a circular orbit of radius 4R , then the speed of X is ____________ times that of Y .

A cyclist speeding at 4.5 km/h on a level road takes a sharp circular turn of radius 3 m without reducing the speed. The coefficient of static friction between the road and the tyres is 0.1. (i) Will he slip while taking the turn? (ii) Will he slip if his speed is 9 km/h?

A cyclist speeding at 18 km// h on a level road takes a sharp circular turn of radius 3 m without reducing the speed . The coefficient of static friction between the tyres and the road is 0.1 Will the cyclist slip while taking the turn ?

A cyclist riding at a speed, of 24.25 ms^(-1) takes a round a circular road of radius 34.64 m. What is his inclination to the vertical ?

If a cyclist moving with a speed of 4.9 m/s on a level can take a sharp circular turn of radius 4 m, then coefficient between the cycle tyres and road is

An artificial satellite is moving in a circular orbit of radius 42250 km . Calculate its speed if it takes 24 hours to revolve around the Earth.

Change a speed of 12 m/sec into km/hr.

Change a speed of 12 m/sec into km/hr.