Asatellite moves in a circular orbit a distance of 1.6×10^5 m above earth's surface. (radius of earth is 6.38 x 10^6m and its mass is 5.98 x 10^24 kg). determine the speed of the satellite.

The speed of the satellite is 7809.52 m/s        

Explanation:

It is given that,

Radius of Earth,

Mass of earth,

A satellite moves in a circular orbit a distance of,  above Earth's surface.

We need to find the speed of the satellite. It is given by :

R = r + d

So,

v = 7809.52 m/s

So, the speed of the satellite is 7809.52 m/s. Hence, this is the required solution.

The correct statement is that half of the Moon that is facing the Sun is lit by the Sun and the other half is dark. So, the correct option that matches the Susan's diagram is D.

The diagram made by Susan is a representation of how the Moon is visible from Earth when one of its side faces the sun as it rotates around the Earth and the position of the Moon.

Rotation of the MoonThe Moon rotates around the Earth. It takes 15 days for one complete rotation around the Earth. While the Moon rotates, its position that is faced by the Sun is lit as the sunlight provides brightness to the Moon and this bright portion is visible as on Earth. When the Moon is not getting faced by the Sun due to its rotation, the Moon is not visible on Earth and is known as a No Moon Day.

Hence, the correct option is D that the Susan's diagram shows that half of the Moon that is facing the Sun is lit by the sun and the other half is dark.

Learn about Rotation of the Moon here:

link