Lecture 8
Special Relativity
and Kinematics
Gary Larsen Far Side
Question
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Which of the following are (is) finite
1) Maximum Speed an object can have
2) Maximum Kinetic Energy an object can have
3) Maximum Momentum an object can have
4) All of the above
5) None of the above
Question
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Which of the following are (is) finite
1) Maximum Speed an object can have
2) Maximum Kinetic Energy an object can have
3) Maximum Momentum an object can have
4) All of the above
5) None of the above
b=0.5
Ground
1
2
b=0.5
b=0.5
3
b=0.5
4
p/m0v
Test of SR momentum p=gm0v
For samples of electrons at different velocities
Measure v and p
Data fits the SR prediction
It does not fit the non relativistic prediction
Tests of Kinetic Energy using electrons
a) K.N. Geller and R. Kollarits, Am. J. Phys. 40 1125 (1972)
b) S. Parker, Am. J. Phys. 40, 241 (1972)
c) W. Bertozzi, Am. J. Phys. 32 551 (1964)
Windsor Ontario – 580 megawatt natural gas-fired power plant.
What is the mass equivalent of the energy this plant generates per year?
Assume the plant runs 24-7 with no down time
1 year ~px107 seconds
1 watt = 1 Joule/second
Windsor Ontario – 580 megawatt natural gas-fired power plant.
What is the mass equivalent of the energy this plant generates per year?
580 megawatts = 6x108J/s x 3 x107 s/yr = 1.8 x1016 J/yr
E=mc2
m=E/c2
=1.8x1016J/(3x108m/s)2
=(1.8x1016/9x1016)kg
= 200g