CH9_studyguide - Midterm3_study_guide_Ch9 3 A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30 below the horizontal just

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157 Midterm3_study_guide_Ch9 3. A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30° below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60° above the horizontal. What is the magnitude of the average resultant force on the ball? a. 14 N b. 11 N c. 18 N d. 22 N e. 3.0 N 8. A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor? a. 9.6 N s b. 2.4 N s c. 6.4 N s d. 1.6 N s e. 1.0 N s 13. A 10-g bullet moving 1000 m/s strikes and passes through a 2.0-kg block initially at rest, as shown. The bullet emerges from the block with a speed of 400 m/s. To what maximum height will the block rise above its initial position? a. 78 cm b. 66 cm c. 56 cm d. 46 cm e. 37 cm
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158 CHAPTER 9 20. A 3.0-kg mass is sliding on a horizontal frictionless surface with a speed of 3.0 m/s when it collides with a 1.0-kg mass initially at rest as shown in the figure. The masses stick together and slide up a frictionless circular track of radius 0.40 m. To what maximum height, h , above the horizontal surface will the masses slide? a.
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This note was uploaded on 05/06/2008 for the course PHYS 195 taught by Professor Anderson during the Spring '07 term at San Diego State.

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CH9_studyguide - Midterm3_study_guide_Ch9 3 A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30 below the horizontal just

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