Answer:
a) truc is C, b) correct result is the B
Explanation:
As the speed of the competition is very high, for the judges the speed is
v = d / t
v = 3 109 m / 20
v = 1.5 108 m / s
This is half the speed of light. For these high speeds we must use the relations of special relativity.
For the time t = to γ
For distance L = Lo / γ
γ = √ (1-v2 / c2)
Own time and distance (to and Lo) corresponds to the observer who is not moving the judges in this case
Let's look for the range value
γ = 1 / √ (1 - (1.5 / 3) 2) = 1 / 0.866 = 1.15
The time t = 20 1.15 = 23 s
The distance L = 3 10 9 /1.15 = 2.60 109 m
From these results we see that time increases and the distance is shorter.
Let's review the claims
A) False. It's the opposite
B) False
C) True. It is according to the result found
D) False.
In the nuclear fusion process, we will also use the special relativity that has a relationship between energy and mass
ΔE = c² Δm
As in the process energy is released, for the law of conservation of the mass of energy to be fulfilled, the total mass of the products, He atom, must be reduced.
Therefore the correct result is the B
