17. An observer O holds a metre scale at an angle of 30 with respect to...
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17. An observer O holds a metre scale at an angle of 30° with respect to the positive X'-axis. O' is moving in the positive X- X' direction with a velocity v relative to observer 0. What is the value of v if the metre scale makes an angle of 45° with respect to X-axis of O. What is the length of the metre scale as measured by O? 18. A particle with a life time of 8 x 106 s created at an altitude of 10 km travels directly towards the earth. If it decays as soon as it reaches the earth, what is its velocity relative to the earth? (Ans. v = 0.816 c, L = 0.707 m) (Ans. 0.972 c) 19. A space ship is observed to cover 90 m in 5 x 10-7 s. What is the distance travelled and time taken (Ans. 72 m, 4 x 107s) as measured by an observer in the space ship? 17. An observer O holds a metre scale at an angle of 30° with respect to the positive X'-axis. O' is moving in the positive X- X' direction with a velocity v relative to observer 0. What is the value of v if the metre scale makes an angle of 45° with respect to X-axis of O. What is the length of the metre scale as measured by O? 18. A particle with a life time of 8 x 106 s created at an altitude of 10 km travels directly towards the earth. If it decays as soon as it reaches the earth, what is its velocity relative to the earth? (Ans. v = 0.816 c, L = 0.707 m) (Ans. 0.972 c) 19. A space ship is observed to cover 90 m in 5 x 10-7 s. What is the distance travelled and time taken (Ans. 72 m, 4 x 107s) as measured by an observer in the space ship?
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Vector Mechanics for Engineers Statics and Dynamics
ISBN: 978-0073212227
8th Edition
Authors: Ferdinand Beer, E. Russell Johnston, Jr., Elliot Eisenberg, William Clausen, David Mazurek, Phillip Cornwell
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