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# Ch3 HW2 - WebAssign Ch3 HW2(Homework Current Score 9 out of...

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Ch3 HW2 (Homework) Arthur Barfield PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 9 out of 21 Due: Wednesday, September 10, 2008 09:00 AM EDT Description Gravitational force and prediction of motion. Instructions Reading: Sec. 3.4-3.6. In question 5 we lead you through the several steps necessary to calculate the gravitational force as a vector. In question 6 we ask you to do a similar calculation on your own; carry out the same steps as in question 5. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2 03.X.08.01] 2/2 points The mass of the Sun is 2 10 30 kg, and the mass of Venus is 4.9 10 24 kg. The distance from the Sun to Venus is 1.1 10 11 m. (a) Calculate the magnitude of the gravitational force exerted by the Sun on Venus . 5.4e22 5.43e+22 N (b) Calculate the magnitude of the gravitational force exerted by Venus on the Sun. 5.4e22 5.43e+22 N Solution or Explanation | grav | = G M 1 M 2 /r 2 , therefore the magnitude of the gravitational force is the same for both masses. 2. [MI2 03.RQ.28] 4/5 points

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(a) Calculate the magnitude of the gravitational force exerted by Mercury on a 80 kg human standing on the surface of Mercury . (The mass of Mercury is 3.3 10 23 kg and its radius is 2.4 10 6 m.) 305.7 307 N (b)Calculate the magnitude of the gravitational force exerted by the human on Mercury . 305.7 307 N (c) For comparison, calculate the approximate magnitude of the gravitational force of this human on a similar human who is standing 2.5 meters away.
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Ch3 HW2 - WebAssign Ch3 HW2(Homework Current Score 9 out of...

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