The answer is: 720W
The definition of Power is:P =L/t =→F⋅→s/t =→F⋅→s/t = →F⋅→v
The ⋅ in the last formulation designate a scalar product, well-defined by:
→v . →w = |v| |w| cos(ˆvw), the angle ˆvw is 0 because →F and →v are parallel, so the cosinus is 1.
So: P=1800N⋅ 0,40m/s=720W.
Red light bends the least when it is refracted by a prism. Red light has the longest wavelength and bends the least when refracted by a prism. Violet light bends the most and has the shortest wavelength.
I hope that helps u out!
:)
Answer: 132.02 J
Explanation:
By definition, the kinetic energy is written as follows:
KE = 1/2 m v²
In our question, we know from the question, the following information:
m = 0.1434 Kg
v= 42.91 m/s
Replacing in the equation for KE, we have:
KE = 1/2 . 0.1434 Kg. (42.91)² m²/s² ⇒ KE = 132.02 N. m = 132.02 J
Answer: It remains the same
Explanation:
The Conservation of Momentum principle establishes that the initial momentum must be equal to the final momentum :
(1)
In the case of the train, its initial momentum is:
(2)
Where is the mass of the train and is the initial velocity of the train
And, its final momentum is:
(3)
Where:
since we are told the mass of the train is doubled
since we are told the velocity of the train goes to half
Hence:
(4)
(5)
(6)
This means the momentum of the train remains the same.