Gravitation and Planetary Motion

What happens to Gravitational force if I double both of the masses but don't change their distance?

• doubles
• half as big
• 4x bigger
• 4x smaller

Tags

NGSS.HS-PS2-4

Kepler's second law or the equal area law states that the closer a planet is to the sun the ________ it travels. 

• Faster 
• Slower
• Higher
• Lower

This model best illustrates which of the following laws?

• Kepler's 2nd Law of Motion
• Newton's 1st Law of Motion
• Kepler's 3rd Law of Motion
• Newton's Law of Universal Gravitation

Planets revolve around the sun in an elliptical orbit. Is this Kepler's 1st, 2nd, or 3rd Law? ?  

• 1st
• 2nd
• 3rd
• None

Two satellites are in orbit around a planet. One satellite has an orbital radius of 8.0×10⁶ m. The period of revolution for this satellite is 1.0×10⁶ s. The other satellite has an orbital radius of 2.0×10⁷ m. What is this satellite’s period of revolution?

• 5.0×10⁵ s

• 4.0×10⁶ s

• 2.5×10⁶ s

• 1.3×10⁷ s

The illustration below shows a satellite in orbit around a small planet. The satellite’s orbital radius is 6.7×10⁴ km and its speed is 2.0×10⁵ m/s. What is the mass of the planet around which the satellite orbits? (G = 6.67×10⁻¹¹ N·m²/kg²)

• 2.5×10¹⁸ kg

• 2.5×10²³ kg

• 4.0×10²⁰ kg

• 4.0×10²⁸ kg

Two satellites are in orbit around the same planet. Satellite A has a mass of 1.5×10 2 kg, and satellite B has a mass of 4.5×10³ kg. The mass of the planet is 6.6×10 24 kg. Both satellites have the same orbital radius of 6.8×10⁶ m. What is the difference in the orbital periods of the satellites?

• no difference

• 2.2×10² s

• 3.2×10² s

• 4.2×10² s

Figure shows a Cavendish apparatus like the one used to find G. It has a large lead sphere that is 5.9 kg in mass and a small one with a mass of 0.047 kg. Their centers are separated by 0.055 m. Find the force of attraction between them.

• 6.11×10^-9 N

• 6.11×10^-12 N

• 6.11×10^-6 N

• 6.11×10^-15 N

Find the value of g on the moon, if the mass and radius of the moon is 7.346×10²² kg and 1.74×10⁶ m.

• 2.622 m/s²

• 3.452 m/s²

• 1.622 m/s²

• 4.622 m/s²

The factors on which 'g' does not depends

• mass of the planet

• Physical radius of the planet

• Time period of the planet

• Universal Gravitational constant G