During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the speceship from the ground station ? The signal travels at the speed of light, that is, `3 xx 10^(8) m//s`.

What is the refractive index of a medium in which light travels with a speed of 2 xx 10^(8)m//s ?

(a) The time interval between transmission and reception of a signal at radar station is 30 mus . What is the distance of the intercepting plane from the station ? (b) Define uniform velocity and uniform acceleration. What are their units ?

What is the refractive index of a medium in which light travels with a speed of 2 xx 10^8 m//s ?

A radar signal is beamed towards a planet and its echo is recived 7 minutes later. If the distance between the planet and earth is 6.3xx10^(10)m, calculate the speed of the signal.

Television signal on earth cannot be recevied at distances greater than 100 km from the transmission station. The reasion behind this is that

A ball falls of a table and reaches the ground in 10 s. Assuming g=10m//s^(2) , calculate its speed on reaching the ground and the height of the table.

A body is projected horizontally from a height of 20 m . It reaches the ground at a horizontally distance of 40 m . The speed of practicle when it hits the ground is