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# img207 - 77777 77777 28 A cannon of mass 1500 kg ﬁres a...

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Unformatted text preview: 77777 77777 - 28. A cannon of mass 1500 kg ﬁres a 10 kg shell with a. velocity of 200 m/s at an angle of 45° above the horizontal. Find the recoil velocity of the cannon across the level ground. (1) 0.94 m/s (2) 1.15 m/s (3) 0.76 m/s (4) 0.56 m/s (5) 2.41 111/5 29. A cannon of mass 1500 kg ﬁres a 10 kg shell with a velocity of 200 m/s at an angle of 30" above the horizontal. Find the recoil velocity of the cannon across the level ground. (1) 1.15 m/s (2) 0.94 m/s (3) 0.76 m/s (4) 0.56 m/s (5) 2.41 m/s 30. A cannon of mass 1500 kg ﬁres a 10 kg shell with a velocity of 200 m/s at an angle of 55° above the horizontal. Find the recoil velocity of the cannon across the level ground. \ (l) 0.76 m/s (2) 1.15 m/s (3) 0.94 m/s (4) 0.56 m/s (5) 2.41 111/8 31. A 0.30 kg rock is swung in a circular path and in a vertical plane on a 0.25 m length string. At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that point? (1) 7.9 N (2) 4.6 N (3) 1.9 N (4) 12 N (5) 16 N 32. A 0.30 kg rock is swung in a circular path and in a vertical plane on a 0.25 in length string. At the top of the path, the angular speed is 10.0 rad /s. What is the tension in the string at that point? (1) 4.6 N (2) 7.9 N (3) 1.9 N (4) 12 N (5) 16 N 33. A 0.30 kg rock is swung in a circular path and in a vertical plane on a 0.25 in length string. At the top of the path, the angular speed is 8.0 rad/s. What is the tension in the string at that point? (1) 1.9 N (2) 4.6 N (3) 7.9 N (4) 12 N (5) 16 N 34. A 0.30 kg rock is swung in a circular path and in a vertical plane on a 0.25 m length string. At the top of the path, the angular speed is 14.0 rad/s. What is the tension in the string at that point? (1) 12 N (2) 4.5 N (3) 1.9 N (4) 7.9 N . (5) 16 N 35. A ﬁgure skater on ice with arms extended, spins at a rate of 2.5 rev/s. After he draws his arms in, he spins at 6.0 rev/s. By what factor does the skater’s kinetic energy change when he draws his arms in? (1) 2.4 (2) 1.6 (3) 3.2 (4) 4.0 (5) 0 36. A ﬁgure skater on ice with arms extended, spins at a rate of 2.5 rev /5. After he draws his arms in, he spins at 4.0 rev/s. By what factor does the skater’s kinetic energy change when he draws his arms in? (1) 1.6 (2) 2.4 (3) 3.2 (4) 4.0 (5)0 37. A ﬁgure skater on ice with arms extended, spins at a rate of 2.5 rev/s. After he draws his arms in, he spins at 8.0 rev/s. By what factor does the skater’s kinetic energy change when he draws his arms in? (1) 3.2 (2) 1.6 (3) 2.4 (4) 4.0 (5) 0 195 ...
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