Studio 15 Gravity SOLUTIONS

Problem 3 Answer the following: a. What is the gravitational acceleration of Mars at its surface? Solution: g mars = 3 . 7 m/s 2 b. What is the escape velocity of Mars? Solution: v escape = 5 km/s c. What is harder to escape from: Earth (if you start on the Earth’s surface) or Sun (if you start at the Earth’s orbit)? M Earth = 6 . 0 × 10 24 kg M Sun = 2 . 0 × 10 30 kg R Earth = 6 . 4 × 10 6 m R Earth ′ s orbit = 1 . 5 × 10 11 m Solution: The sun from Earth’s orbit. v escape,sun = 42 . 2 km/s