University:
Concordia University Wisconsin
Course:
PHYS 1514 | General Physics I
Academic year:

2021
Views:

116

Pages:

2
Author:

Nesbyenvkk

Test includes -river problem (2) -gen relatiuty m 125 (Kay Physics Relativity Review Name: Formula: tom: These are the variables that are measured when the observer is at rest with respect to the measurement being made. t= L=Lo 122 1- tto 771> E=mc² Ex Questions: 1. If you were travelling away from the Earth at 0.5c, would you notice a change in your heartbeat? Would your mass, height, or waistline change? What would observers on Earth, using a telescope to see you, say about you? you would not notice a change, A stationary observer wald see you slow down, your mais ncrease and you shout in drection of motion. 2. What happens to the relativistic factor 1- when objects travel at normal, everyday velocities? 1- T== 3. A spaceship travels at 0.99c for 3.0 years ship time. How much time would pass on the Earth? to 3 yrs 10.2 = 21 yrs to 4. A spaceship has been gone from the Earth for a total time of 5.0 years ship time. The people on the Earth have measured the time that the ship was away to be 25 years. How fast was the ship travelling? 1-= 1- t =²(1) V= P =(1-() = 2.9×10M = 0.980 V 5. A 520m long (measured when it was stationary) spaceship passes by the Earth at 0.87c. What length would the people on Earth say the spaceship is? L=Lo1-= 52001-)² = 520円 10.872 256m = 2.6×10m Me 6. A 25kg rock is accelerated to a speed of 0.98c. a. What would the mass of this rock be at this speed? Me m= 2519 10.9te V2 = 125.69 1.3×10m the b. How much energy would-be associated with the rock-at-rest? At this speed? ot rest: E=mc² = 25kg c² = 2.25×10 J = 2.3×10J at 0.98c: E=mc²= (125.6)c² = 1.1x10"J 7. An observer on Earth sees an enemy alien spaceship approaching at 0.60c. The Starship Enterprise comes to the rescue overtaking the spaceship at 0.90c relative to the alien spaceship. How fast would the observers on Earth measure the Enterprise to be travelling at? U= V+u 0.6c+0.9c 1+(0.60.9) = 0.97c (toward] Review Answers: 1. You would not notice anything different about yourself. To you everything seems normal. To a stationary observer your heartbeat and other life signs would all have slowed down compared to those on Earth. Your mass would have increased and you would be skinnier in the direction of motion. 2. Relativistic factor becomes equal to 1! This means that at ordinary speeds we do not worry about it. 3. years 4. 0.98c2. 5. 256m 2.6x10 6. a. 126kg b. 23810, 1.1810 7. 0.97c 1.3x1 [tumard

Physics Relavity Review Test Includes

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