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# img210 - 77777 77777 57 You stand by the railroad tracks as...

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Unformatted text preview: 77777 77777 57. You stand by the railroad tracks as a train passes by. You hear a 1000 Hz frequency when the train approaches, which changes to 850 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s. (1) 27.6 m/s (2) 17.9 m/s (3) 37.8 m/s (4) 8.7 m/s ‘ (5) 53.4 m/s 58. A rock is thrown straight up with an initial velocity of 20.6 m/s. What time interval elapses between the rock’s being thrown and its return to the original launch point? ' (1) 4.2 s (2) 3.2 s (3) 5.4 s (4) 6.7 s (5) 8.3 s 59. A rock is thrown straight up with an initial velocity of 15.6 m/s. What time interval elapse; between the rock’s being thrown and its return to the original launch point? (1) 3.2 s (2) 4.2 s (3) 5.4 s (4) 6.7 s (5) 8.3 s 60. A rock is thrown straight up with an initial velocity of 26.6 m/s. What time interval elapses between the rock’s being thrown and its return to the original launch point? (1) 5.4 s (2) 3.2 s (3) 4.2 s (4) 6.7 s (5) 8.3 s 61. Two blocks of masses 20 kg and 8 kg are connected together by a light string and rest on a ﬁictionless level surface. Attached to the 8 kg mass is another light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.5 m/sz, what is the tension in the connecting string between the blocks? (1) 10 N (2) 14 N (3) 18 N (4) 6 N (5) o N 62. Two blocks of masses 20 kg and 8 kg are connected together by a light string and rest on a. frictionless level surface. Attached to the 8 kg mass is another light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.7 m/sz, what is the tension in the connecting string between the blocks? (1) 14 N (2) 10 N (3) 18 N (4) 6 N (5) o N l 63. Two blocks of masses 20 kg and 8 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8 kg mass is another light string, which a person uses to pull both blocks horizontally. Ifthe two-block system accelerates at 0.9 m/sz, what is the tension in the connecting string between the blocks? (1) 18 N (2) 14 N (3) 10 N (4) 6 N (5) 0 N S5Q#SGQ#S7Q#SSTYPE2Q#S13Q#SI4Q#S15Q#Sl6TYPE3Q#S17Q# 18Q# TYPE4Q#S21Q#S22Q#S23Q#S24TYPE5Q#S25Q#326Q#827TYPE6Q# OTYPE7Q#S31Q#S32Q#S33Q#S34TY'PE8Q#S35Q#S36Q#S37TYPE9Q# TYPEIOQ#S41Q# 42Q#S43TYPE11Q#S44Q#S45Q#S46TYPE12Q# 55 S #S50TYPE13Q#SS2Q#353Q#SS4TYPE14Q#S 60TYPE16Q#SGIQ#862Q#SG3 CD ilk 198 ...
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