In lightning , light is seen first and sound is heard later it is due to
2 answers:
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The correct answer is the following.
The forces that act on the piano are: 2) gravitational force acting on the piano (piano's weight). 5) force of the floor on the piano (normal force). 7) force of Chadwick on the piano.
As we see in the picture that I have attached is Chadwick pushing the piano in a horizontal plane. So Chadwick is applying a force that produces an acceleration. It is his force on the piano plus the acceleration of the weight of the piano, it's a gravitational force. This is pure physics applied to an object.
Answer:
a)
The velocity increase by a factor of
b)
The velocity decrease by a factor of 2.
c)
The velocity increase by a factor of 2
d)
The velocity not changes.
Explanation:
For this case we know that the velocity is
represent the final velocity after the changes specified,
Part a
The formula for the speed of a wave in a string is given by:
And the linear density is defined as:
And if we replace this we got:
If the tension mass is doubled we have this:
The velocity increase by a factor of
Part b
If we mass is quadrupled we have this:
The velocity decrease by a factor of 2.
Part c
If the length is quadrupled we have this:
The velocity increase by a factor of 2
Part d
For this case we know that the mass and the length are both quadrupled and we got:
The velocity not changes.