Practice Homework 7 - practice 07 ALIBHAI, ZAHID 1 Latest...

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Unformatted text preview: practice 07 ALIBHAI, ZAHID 1 Latest unpenalized work: Mar 4 2007 Sunday 04:00 (after this date you can not make a perfect score). Work cutoff: Mar 4 2007, 4:00 am. Question 1 part 1 of 1 10 points Two identical stars, a fixed distance D apart, revolve in a circle about their mutual center of mass, as shown below. Each star has mass M and speed v . G is the universal gravitational constant. D v v M M Which of the following is a correct relation- ship among these quantities? 1. v 2 = GM D 2 2. v 2 = 2 GM D 3. v 2 = 4 GM 2 D 4. v 2 = M GD 5. v 2 = 2 GM 2 D 6. v 2 = GM 2 D 7. v 2 = 4 GM D 8. v 2 = GM D Question 2 part 1 of 2 10 points Compare the gravitational force on a 45 . 5 kg mass at the surface of the Earth ( R E = 6 . 4 10 6 m, M E = 6 10 24 kg) with that on the surface of the Moon ( M M = 1 81 . 3 M E , R M = 0 . 27 R E ). What is it on the Earth? Answer in units of N. Question 3 part 2 of 2 10 points What is it on the Moon? Answer in units of N. Question 4 part 1 of 1 10 points If a book is sitting on a table, the force of gravity is pulling it down. Why doesnt it fall? 1. The book has a pushing force on the table. 2. The book is not heavy enough. 3. The table is pushing up on it with a force equal to the weight of the book. Question 5 part 1 of 2 10 points Given: G = 6 . 6726 10 11 N m 2 / kg 2 . Three masses are arranged in the ( x,y ) plane (as shown in the figure below, where the scale is in meters). y ( m ) 5 3 1 0 1 2 3 4 5 x ( m ) 5 4 3 2 1 1 2 3 4 5 6 kg 3 kg 4 kg What is the magnitude of the resulting force practice 07 ALIBHAI, ZAHID 2 on the 6 kg mass at the origin? Answer in units of N. Question 6 part 2 of 2 10 points Select the figure showing the direction re- sultant force on the 6 kg masses at the origin. 1. y 5 3 10 1 2 3 4 5 x 5 4 3 2 1 1 2 3 4 5 2. y 5 3 10 1 2 3 4 5 x 5 4 3 2 1 1 2 3 4 5 3. y 5 3 10 1 2 3 4 5 x 5 4 3 2 1 1 2 3 4 5 4. y 5 3 10 1 2 3 4 5 x 5 4 3 2 1 1 2 3 4 5 5. None of these figures is correct. 6. y 5 3 10 1 2 3 4 5 x 5 4 3 2 1 1 2 3 4 5 7. y 5 3 10 1 2 3 4 5 x 5 4 3 2 1 1 2 3 4 5 Question 7 part 1 of 2 10 points The universal gravitationan constant is 6 . 6726 10 11 N m 2 / kg 2 . Three 5 kg masses are located at points in the xy plane as shown in the figure. 32 cm 51 cm What is the magnitude of the resultant force (caused by the other two masses) on the mass at the origin? Answer in units of N. Question 8 part 2 of 2 10 points At what angle from the horizontal ( x ) axis will the resultant force point?...
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This note was uploaded on 10/13/2009 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

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Practice Homework 7 - practice 07 ALIBHAI, ZAHID 1 Latest...

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