How much potential energy is stored on a stone kept on the earth surface? Why?
2 answers:
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The expected time period between the observations of lightning and thunder would be 22.5 s.
How to calculate the time of sound waves?
The time taken by sound to reach a certain position can be calculated by the speed formula,
Where,
- speed = 0.343 km/s
- distance = 7.5 km
- time = ?
Put the values in the formula,
Therefore, the expected time period between the observations of lightning and thunder would be 22.5 s.
Learn more about the expected time:
Answer:
Explanation:
The resistance of a piece of wire is given by
where
is the resistivity of the material
L is the length of the wire
A is the cross-sectional area
In this problem, we have
L = 7.0 m
The diameter of the wire is 0.14 cm, so the radius is 0.07 cm, therefore the cross sectional area is
Therefore, the resistance is
To solve this problem we will use the theorems related to the conservation of momentum to determine the final speed of the system, once the bullet hits it. From there, we will calculate with the kinematic equations of linear motion, the height traveled with that speed. The conservation of momentum say us that,
Where,
mass of bullet
mass of block of wood
Initital velocity of bullet and block of wood respectively.
Final velocity
Our values are given as,
Replacing we have that
Note that the initial velocity of wood block is 0 because is at rest
Now using the kinematic equation of motion we have that
As
Therefore the height reached by block after bullet embedding in it is 0.49 m