Why are rockets usually launched from west to east?

The earth rotates about its axis from west to east. So, any point on earth surface has linear velocity from west to east. When the rockets are launched in the same direction, the linear velocity of earth will be added to them. Hence, rockets are launched from west to east.

The mass and diameter of a planet are twice those of earth. What will be the time period of the pendulum on this planet, which is a seconds pendulum on the earth?

The escape velocity on earth’s surface is 11.2 km/sec. If the radius of planet is 1/3rd that of earth and mass 1/4th, what will be the escape velocity on the planet?

How do the K.E. and P.E. of a satellite change when it moves around the earth in elliptical orbit?

A person sitting in an artificial satellite of the earth feels weightlessness but not on the moon though the moon is also a satellite of the earth. Why?

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The mass and diameter of a planet are twice those of earth. What will be the time period of the pendulum on this planet, which is a seconds pendulum on the earth?

The escape velocity on earth’s surface is 11.2 km/sec. If the radius of planet is 1/3rd that of earth and mass 1/4th, what will be the escape velocity on the planet?

How do the K.E. and P.E. of a satellite change when it moves around the earth in elliptical orbit?

A person sitting in an artificial satellite of the earth feels weightlessness but not on the moon though the moon is also a satellite of the earth. Why?

If earth suddenly stops rotating about its axis, what would be the effect on ‘g’? Would this effect be the same at all places?

The mass of moon is about 1/81 that of earth and radius 1/4. Calculate the acceleration due to gravity on the surface of moon.