oldmidterm 01

# oldmidterm 01 - WANG (xw788) – oldmidterm 01 – Turner...

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Unformatted text preview: WANG (xw788) – oldmidterm 01 – Turner – (59070) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Two spheres, fastened to “pucks”, are rid- ing on a frictionless airtrack. Sphere “1” is charged with 1 nC, and sphere “2” is charged with 2 nC. Both objects have the same mass. 1 nC is equal to 1 × 10 − 9 C. As they repel, 1. they have the same magnitude of acceler- ation. 2. they do not accelerate at all, but rather separate at constant velocity. 3. sphere “1” accelerates 2 times as fast as sphere “2”. 4. sphere “1” accelerates 4 times as fast as sphere “2”. 5. sphere “2” accelerates 4 times as fast as sphere “1”. 6. sphere “2” accelerates 2 times as fast as sphere “1”. 002 10.0 points Three equal charges of 4 μ C are in the x- y plane. One is placed at the origin, another is placed at (0.0, 59 cm), and the last is placed at (16 cm, 0.0). The Coulomb constant is 9 × 10 9 N m 2 / C 2 . Calculate the magnitude of the force on the charge at the origin. Answer in units of N. 003 10.0 points Two identical small charged spheres hang in equilibrium with equal masses as shown in the figure. The length of the strings are equal and the angle (shown in the figure) with the vertical is identical. The acceleration of gravity is 9 . 8 m / s 2 and the value of Coulomb’s constant is 8 . 98755 × 10 9 N m 2 / C 2 . . 1 9 m 4 ◦ . 02 kg . 02 kg Find the magnitude of the charge on each sphere. Answer in units of C. 004 10.0 points A circular arc has a uniform linear charge density of 6 nC / m....
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## This note was uploaded on 10/11/2009 for the course PHY 303L taught by Professor Turner during the Spring '08 term at University of Texas.

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oldmidterm 01 - WANG (xw788) – oldmidterm 01 – Turner...

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