A man stands on roof of a house and drops a ball of mass M (from rest) from a height of 10 m above the ground. Its speed just be
1 answer:
Answer:
Vf = 14 [m/s]
Explanation:
To solve this problem we must use the following equation of kinematics, which is independent of the mass of the object.
where:
Vf = final velocity [m/s]
Vo = initial velocity = 0
g = gravity acceleration = 9.81 [m/s²]
x = distance = 10 [m]
Now replacing:
Vf² = 0 + (2*9.81*10)
Vf = 14 [m/s]
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Answer:
None of the wavelength is in the visible range
Explanation:
Constructive interference of the reflected waves for different wavelengths can be estimated using:
λ = 2nd/m
where m is 1,2,3, ...
Therefore:
m=1, λ = 750 nm
m=2, λ = 750/2 = 375 nm
The limits of eye's sensitivity is between 430 nm and 690 nm. Beyond this range, the eye's sensitivity drops to approximately 1% of its maximum value.