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Unformatted text preview: homework 26 – NOORANI, ZOHEB 1 Latest unpenalized work: Mar 31 2008 Mon- day 04:00 (after this date you can not make a perfect score). Work cutoff: Apr 1 2008, 4:00 am. Question 1, chap 13, sect 2. part 1 of 1 10 points A solid sphere has a radius of 0 . 75 m and a mass of 150 kg. How much work is required to get the sphere rolling with an angular speed of 89 rad / s on a horizontal surface? Assume the sphere starts from rest and rolls without slipping. Answer in units of J. Question 2, chap 13, sect 4. part 1 of 1 10 points A 2 kg object moves in a circle of radius 4 m at a constant speed of 3 m / s. A net force of 4 . 5 N acts on the object. What is the magnitude of the angular mo- mentum bardbl vector L bardbl of the object with respect to an axis perpendicular to the circle and through its center? 1. bardbl vector L bardbl = 12 m 2 s 2. bardbl vector L bardbl = 13 . 5 kg m 2 s 2 3. bardbl vector L bardbl = 9 N m kg 4. bardbl vector L bardbl = 24 kg m 2 s 5. bardbl vector L bardbl = 18 N m kg Question 3, chap 13, sect 4. part 1 of 1 10 points A solid steel sphere of density 7 . 57 g / cm 3 and mass 0 . 3 kg spins on an axis through its center with a period of 3 . 5 s. Given V sphere = 4 3 π R 3 , what is its angular momentum?...
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This note was uploaded on 09/16/2009 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas.
- Spring '08