Speeding tickets avoidance
Discussion
This forum reminded me of a an old exam question I once had.
A car was caught driving through a red light. The driver went to court and used as his defense. Sorry your honor but the light was not red it appeared to be green when I was driving towards it.
So the judge accepted this defense but instead told the driver they will be fined for speeding instead. 1 pence for every mile and hour over the speed limit of 30MPH.
What was the fine issued?
:-)
A car was caught driving through a red light. The driver went to court and used as his defense. Sorry your honor but the light was not red it appeared to be green when I was driving towards it.
So the judge accepted this defense but instead told the driver they will be fined for speeding instead. 1 pence for every mile and hour over the speed limit of 30MPH.
What was the fine issued?
:-)
(ii)Given the Amber time Ta = 6s and given the speed of light = 3x10^8ms^-1 and a driver reaction time of 0.3s from the light changing from green, calculate the minimum velocity of the car given it passed the stop line as or before the light turned red.
Show your calculation and state any assumptions. [3 points]
(ii) Calculate the distance travelled [60quid]
Show your calculation and state any assumptions. [3 points]
(ii) Calculate the distance travelled [60quid]
Not sure you would see any effect on weight of the light. The doppler effect is accurate. It's a simple equation to calculate the speed required to apparently shift the light to a new frequency as the driver sees it. The driver sees a shorter wave length as they are driving into the light beam.
The brightness of the light does not affect the speed at which the light is traveling to the driver.
I cannot remember the exact answer in was 10 years ago or the frequencies of the red and green, but If the speed of light is approx 300000000 m/s. The speed required for the doppler shift to shorten the frequency of the light reaching the drivers eye was something in the region of 200000000 to 300000000 which would make the drivers fine about £4.5M-5.5M.
The assumption is the driver never even tried to brake when seeing the light as the light was actually green from his perspective.
Another interesting question would be what was the drivers Mass at that speed :-)
Question 2 on the exam paper was to calculate the frequency of a billard ball at 2m/s due to quantum wave mechanics by applying which all object have. I think the answer came in the region of x10^-13.
But it does mean you can go down the pub and tell everyone the ball is not traveling in a straight line when you hit it. (see how long you last)
The brightness of the light does not affect the speed at which the light is traveling to the driver.
I cannot remember the exact answer in was 10 years ago or the frequencies of the red and green, but If the speed of light is approx 300000000 m/s. The speed required for the doppler shift to shorten the frequency of the light reaching the drivers eye was something in the region of 200000000 to 300000000 which would make the drivers fine about £4.5M-5.5M.
The assumption is the driver never even tried to brake when seeing the light as the light was actually green from his perspective.
Another interesting question would be what was the drivers Mass at that speed :-)
Question 2 on the exam paper was to calculate the frequency of a billard ball at 2m/s due to quantum wave mechanics by applying which all object have. I think the answer came in the region of x10^-13.
But it does mean you can go down the pub and tell everyone the ball is not traveling in a straight line when you hit it. (see how long you last)
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