Homework 7

# Homework 7 - homework 07 ALIBHAI ZAHID Latest unpenalized...

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homework 07 – ALIBHAI, ZAHID 1 Latest unpenalized work: Mar 5 2007 Monday 04:00 (after this date you can not make a perfect score). Work cutoF: Mar 7 2007, 4:00 am. Question 1 part 1 of 1 10 points In introductory physics laboratories, a typ- ical Cavendish balance for measuring the gravitational constant G uses lead spheres of masses 2 . 34 kg and 13 . 9 g whose centers are separated by 5 . 54 cm. Calculate the gravitational force between these spheres, treating each as a point mass located at the center of the sphere. Use G = 6 . 67259 × 10 - 11 N m 2 / kg 2 . Answer in units of N. Question 2 part 1 of 1 10 points Given: G = 6 . 673 × 10 - 11 N · m 2 kg 2 Mars has a mass of about 6 . 97 × 10 23 kg, and its moon Phobos has a mass of about 9 . 44 × 10 15 kg. If the magnitude of the gravitational force between the two bodies is 4.69 × 10 15 N, how far apart are Mars and Phobos? Answer in units of m. Question 3 part 1 of 1 10 points Planet X has three times the diameter and six times the mass of the earth. What is the ratio of gravitational accelera- tion at the surface of planet X to the gravita- tional acceleration at the surface of the Earth, g x g e ? 1. g x g e = 5 49 2. g x g e = 2 3 3. g x g e = 9 64 4. g x g e = 9 25 5. g x g e = 2 25 6. g x g e = 6 49 7. g x g e = 7 16 8. g x g e = 1 32 9. g x g e = 5 16 10. g x g e = 2 81 Question 4 part 1 of 1 10 points Two iron spheres, of mass m and 2 m , respectively, and equally spaced points “ r apart” are shown in the ±gure. A m B C D 2 m E r r r r r r At which location would the net gravita- tional force on an object due to these two spheres be a maximum? 1. E 2. C 3. A 4. D 5. B Question 5 part 1 of 2 10 points Given: G = 6 . 672 × 10 - 11 N m 2 / kg 2 . The planet Mars requires 1 . 73 years to orbit the sun, which has a mass of 2 × 10 30 kg, in an almost circular trajectory. Calculate the radius of the orbit of Mars as it circles the sun.

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homework 07 – ALIBHAI, ZAHID 2 Answer in units of m. Question 6
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Homework 7 - homework 07 ALIBHAI ZAHID Latest unpenalized...

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