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Unformatted text preview: homework 14 NOORANI, ZOHEB 1 Latest unpenalized work: Feb 20 2008 Wednesday 04:00 (after this date you can not make a perfect score). Work cutoff: Feb 21 2008, 4:00 am. Question 1, chap 6, sect 99. part 1 of 1 10 points A car with mass 738 kg passes over a bump in a road that follows the arc of a circle of radius 37 . 5 m as shown in the figure. The acceleration of gravity is 9 . 8 m / s 2 . 3 7 . 5 m v 738 kg What is the maximum speed the car can have as it passes the highest point of the bump before losing contact with the road? Answer in units of m / s. Question 2, chap 6, sect 99. part 1 of 2 10 points A small sphere of mass m is connected to the end of a cord of length r and rotates in a vertical circle about a fixed point O. The tension force exerted by the cord on the sphere is denoted by T . r O What is the correct equation for the forces in the radial direction when the cord makes an angle with the vertical? 1. T- mg sin =- mv 2 r tan 2. T- mg cos = + mv 2 r 3. T- mg sin = + mv 2 r tan 4. T- mg sin = + mv 2 r cos 5. None of these 6. T + mg sin = + mv 2 r 7. T- mg sin = + mv 2 r 8. T + mg cos = + mv 2 r 9. T- mg sin =- mv 2 r Question 3, chap 6, sect 99. part 2 of 2 10 points Hint: To solve this part, first find both the radial and the tangential component of the acceleration....
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