The free-fall acceleration on the surface of mercury is about three eighths that on the surface of the earth. the radius of mercury is about 0.375 re (re = earth's radius = 6.4 106 m). find the ratio of their average densities, ? mercury/? earth.

1

Explanation:

G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²

= Mass of Earth

= Mass of Mercury

= Radius of Earth

= Radius of Mercury =

Mass is given by

Acceleration due to gravity on Earth

Acceleration due to gravity on Mercury

According to the question

So,

Hence, the average density ratio of Mercury to Earth is 1

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.