State the order of magnitude of radius of the earth. Given R = 6400 km

State the order of magnitude of duration of a day.

The radius of a nucleus of mass number 'A' is given by R = 1.3 xx 10^-16 xx A^(1//3) . Find the order of magnitude of radius for a nucleus with A = 216.

Calculate angular velocity of the earth so that acceleration due to gravity at 60^(@) latitude becomes zero (radius of the earth = 6400 km, gravitational acceleration at poles = 10 m//s^(2) , cos60^(@) = 0.5 )

Escape velocity of a satellite of the earth at an altitude equal to radius of the earth is v. What will be the escape velocity at an altitude equal to 7R, where R = radius of the earth?

Find the value of acceleration due to gravity in a mine at a depth of 80 km from the surface of the earth . Radius of the earth = 6400 km .

A pendulum which gives correct time 2 s on the ground. It is moved to an altitude 640 m above the earth. If radius of the earth is 6400 km, how much time will the pendulum lose or gain in one day ?

An artificial satellite makes two revolutions per day around the earth. If the acceleration due to gravity on the surface of the earth is 9.8 m//s^2 and the radius of the earth is 6400 km, calculate the distance of satellite from the surface of the earth

State the order of the surds given below: \sqrt{39}

The moon subtends an angle of 57 minutes at the base line equal to radius of earth. What is the distance of moon from earth. Given radius of earth is 6400 km.