Question

a planets gravity is related to which of the following?

atmospheric density

orbit

mass and size

surface area

question 16

all planets rotate counterclockwise except one. which planet rotates clockwise?

venus

earth

mars

mercury

Explanation:

• For the first question, according to the law of universal gravitation \(F = G\frac{Mm}{r^{2}}\), the gravitational force (and thus gravity which is related to gravitational acceleration \(g=\frac{GM}{r^{2}}\), where \(M\) is the mass of the planet and \(r\) is related to the size of the planet) shows that a planet's gravity is related to its mass and size.
• For the second question, among the planets in the solar - system, Venus is known to rotate clockwise while most other planets (like Earth, Mars, Mercury) rotate counter - clockwise.

Answer:

• First question: mass and size
• Second question: Venus