A clock on a moving train runs _____ an identical clock at rest. A.Faster than
1 answer:
Answer:
A.Faster than
Explanation:
Due to the Doppler effect which states that there is a change in frequency because of the relative speeds of two bodies time dilation takes place. For light the relative difference in velocity between the observer and the source needs to be considered.
Time dilation is the phenomenon where time flows differently for two bodies having different to each other. Time dilation has been verified by the readings of the satellite navigation systems.
Where
Δt' = Time elapsed of a moving body
Δt = Time elapsed when the body is stationary
v = Velocity of the moving body
c = Speed of light
As, v is always less than c, Δt' will always be greater than Δt. This means that more time has elapsed for the body in motion.
Hence, the clock in motion will be faster than an identical clock at rest.
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Answer:
Explanation:
The Bernoulli equation is:
(1)
- P is pressure related to the fluid
- ρ is the density of the fluid (ρ(air)=1.23 kg/m³)
- v is the speed of the fluid
- h is the displacement from one position to the other
Now let's apply the equation (1), for our case:
(2)
here we assume that h is the same in both cases so it canceled out.
- <u>subscript 1</u> is related to the upper surface of the wings
- <u>subscript 2</u> is related to the low surface of the wings
Solving the equation for v₁ we have:
(3)
Now, we know that pressure P=F/A (force over area)
(4)
Combining (3) and (4), we can find v1.
I hope it helps you!