Lesson_4.5_Homework

# Lesson_4.5_Homework - Lesson 4.5 Homework 1 What is the...

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Lesson 4.5 Homework: 1. What is the value g on the surface of a planet that has twice the mass of the earth and a radius 1.5 times the radius of the earth? 2. Calculate the force of gravity on a spacecraft 8000 km from the surface of the earth if its mass is 1600 kg. 3. What is the value of g at an altitude of 450 km above the surface of the earth? 4. The average distance of Neptune from the sun is 4.5 × 10 9 km. Using the fact that the earth is 1.5 × 10 8 km from the sun, compute the length of Neptunian year. 5. What is the distance from the earth’s center to a point outside the earth where the acceleration due to earth gravity is ¼ of its value on the surface of the earth? 6. The comet Hale-Bopp has a period of 3000 years. (i) what is its mean distance from the sun? (ii) If at its closest approach, the comet is about 1.5 × 10 8 km from the sun, what is its farthest distance from the sun? (iii) What is the ratio of its speed at perihelion to its speed at aphelion?

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