Answer:
A light bulb lightning up
Explanation:
Answer:
Yes
Explanation:
p = momentum of photon
E = energy of photon
c = velocity of light
Units of p = kg m /s
Units of E = kg m^2 / s^2
Units of E / p = {kg m^2 / s^2} / {kg m /s} = m/s
It is the unit of speed, so by the division of energy to the momentum, we get the speed. yes it is correct.
Answer:
10 hours earlier than regular train
Explanation:
In this case you are already giving the expression to be used which is:
S = D/t (1)
The problem is giving us the data of the speed of both trains, and we also know the distance between City A and B, which is 4000 km, therefore, we just need to solve for t in the above expression for both trains, and then, do the difference between their times and see how much earlier the express train arrives.
Solving for t, we have:
t = D/S (2)
For Train 1 (The regular):
t₁ = 4000 / 80
t₁ = 50 h
For Train 2 (Express):
t₂ = 4000 / 100
t₂ = 40 h
Now, as expected express train arrives earlier, now let's see how much:
T = t₁ - t₂
T = 50 - 40
<h2>
T = 10 h</h2><h2>
</h2>
Therefore, Express train arrives 10 hours earlier than regular train.
Hope this helps