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Unformatted text preview: practice 03 – ALIBHAI, ZAHID 1 Latest unpenalized work: Feb 5 2007 Monday 04:00 (after this date you can not make a perfect score). Work cutoff: Feb 4 2007, 4:00 am. Question 1 part 1 of 2 10 points A particle travels between two parallel ver tical walls separated by 13 m. It moves to ward the opposing wall at a constant rate of 7 . 2 m / s. It hits the opposite wall at the same height. The acceleration of gravity is 9 . 8 m / s 2 . 13 m 9 . 8m / s 2 7 . 2 m / s a) What will be its speed when it hits the opposing wall? Answer in units of m / s. Question 2 part 2 of 2 10 points b) At what angle with the wall will the particle strike? Answer in units of ◦ . Question 3 part 1 of 1 10 points A target lies flat on the ground 7 m from the side of a building that is 10 m tall, as shown below. The acceleration of gravity is 10 m / s 2 . Air resistance is negligible. A student rolls a 7 kg ball off the horizontal roof of the building in the direction of the target. 7 m 10m v 10m The horizontal speed v with which the ball must leave the roof if it is to strike the target is most nearly 1. v = √ 2 7 m/s. 2. v = 7 √ 3 m/s. 3. v = √ 5 7 m/s. 4. v = 7 √ 3 3 m/s. 5. v = 3 √ 7 m/s. 6. v = 2 √ 7 m/s. 7. v = 7 √ 5 m/s. 8. v = 7 √ 2 m/s. 9. v = 7 √ 2 2 m/s. 10. v = √ 3 7 m/s. Question 4 part 1 of 2 10 points Two identical balls ( A and B ) are tossed through the air as shown in the figure below. practice 03 – ALIBHAI, ZAHID 2 y x 61 . 8 ◦ 45 ◦ R A B Consider the following statements: α Ball A has greater launch speed than ball B . β Ball B has greater launch speed than ball A . γ Ball A and ball B have the same launch speed. δ Ball A spends more time in the air that ball B . θ Ball B spends more time in the air that ball A . ω Ball A and ball B spend the same time in the air. Which of the statements are correct? 1. α and δ 2. β and ω 3. β and δ 4. γ and ω 5. γ and δ 6. α and θ 7. γ and θ 8. β and θ 9. α and ω Question 5 part 2 of 2 10 points Two identical projectiles ( A and B ) are tossed through the air as shown in the figure below. y x 61 . 8 ◦ 75 ◦ R R/ 2 B A Consider the following statements: α Ball A has greater launch speed than ball B ....
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