D the coefficient of static friction is greater than

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Unformatted text preview: ic friction. d. The coefficient of static friction is greater than 0.25 while the coefficient of kinetic friction is less than 0.25. ©Prep101 6. A woman stands on a bathroom scale in an elevator which is not moving. The scale reads 500 N. The elevator then moves downward at a constant velocity of 5 m/s. What does the scale read while the elevator descends with constant velocity? a. 100 N b. 250 N c. 450 N d. 500 N 10. John and Jane are 10 m apart on an icy, frictionless lake. Jane’s mass is 40 kg excluding the 1 kg ball she holds. John’s mass is 59 kg. Jane throws the ball to John with a horizontal velocity of 10 m/s. How far apart are Jane and John 10 s later? a. 12 m b. 13 m c. 14 m d. 15 m 7. A car enters a horizontal, curved roadbed of radius 50 m. The coefficient of static friction between the tires and the roadbed is 0.20. What is the maximum speed with which the car can safely negotiate the curve? a. 4.5 m/s b. 10 m/s c. 20 m/s d. 40 m/s 11. A car of mass 1500 kg is travelling around a banked curve which is inclined at an angle of 15.0° above the horizontal. 8. A group of students need to cross a river in the shortest time. The water in the river flows downstream at a speed of 10m/s. The boat has a maximum speed of 20m/s. In what direction should be the students head the boat? a. Downstream b. D irectly toward the opposite shore c. 63o away from downstream upstream d. 9. Ying and Albert are carrying Faisal on a horizontal stretcher. The stretcher is uniform, is 2.0 m long, and weighs 100N. Faisal weighs 800N. Faisal’s centre of gravity is 75 cm from Ying. Ying and Albert are at the ends of the stretcher. The force that Albert is exerting to support the stretcher with Faisal on it is: a. 250 N b. 300 N c. 350 N d. 450 N The car's path is circular with a radius of curvature of 100 m. Assuming that the road surface is frictionless, What is the speed of the car such that it remains on the banked curve? a. 16.2 m/s b. 18.2 m/s c. 20.5 m/s d. 14.5 m/s 12. A simple pendulum consisting of a mass m and string, swings upward, making an angle...
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This note was uploaded on 03/23/2011 for the course CHEM 100 taught by Professor Vallis during the Spring '11 term at Dalhousie.

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