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Applied Physics 2: Relativity
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Applied Physics 2: Relativity
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20 Questions

1. All the given particles have a lifetime of 1 microsecond. Which of them will survive the longest?
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2. A cube with sides of proper length lo is viewed from a reference frame moving with velocity v, parallel to an edge of the cube. The expression for the volume of the cube for the observer is __________
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3. The volume of a parallelepiped in Cartesian is
4. The angular separation between the vectors A = 4i + 3j + 5k and B = i – 2j + 2k is (in degrees)
5. The scalar factor of Cartesian system is unity.
6. A particle with a lifetime of 2 X 10-6 s moves through the laboratory with a speed of 0.9 c. It’s lifetime, as measured by an observer in the laboratory, is ___________
7. If an object reaches the speed of light, it’s length changes to ___________
8. The Cartesian system is also called as
9. How fast does a rocket have to move relative to an observer for its length to be contracted to 95% of its original length?
10. Which of the following criteria is used to choose a coordinate system?
11. The length of a rod seems shorter to an observer when it moves in a specific direction. What change would he observe when the direction of rod changes by 180o?
12. A rod of length 5 m is moving at a speed of 0.6 c. To an observer sitting perpendicular to the direction of motion, the length appears to be _______________
13. The Cartesian coordinates can be related to cylindrical coordinates and spherical coordinates.
14. A 20-year-old person goes at a high speed in a rocket on his birthday. when he comes back to earth after 1 earth year, he would be ___________
15. The spherical equivalent of the vector B = yi + (x + z)j located at (-2,6,3) is given by
16. A rod of length 1m moves with a speed of 0.5 c. How much length contraction takes place?
17. A charge is placed in a square container. The position of the charge with respect to the origin can be found by
18. Transform the vector A = 3i – 2j – 4k at P(2,3,3) to cylindrical coordinates
19. An object of length 1 m is moving at speed 0.5c. To an observer at rest relative to the object, the length of the object seems to be ___________
20. Vector transformation followed by coordinate point substitution and vice-versa, both given the same result. Choose the best answer.

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