The time needed is 25 s
Explanation:
Assuming that the sprinter is moving by uniform motion, then we can use the following equation that relates distance, time and speed:
where
v is the speed of the sprinter
d is the distance covered
t is the time elapsed
In this problem, we know that
v = 4 m/s is the speed of the sprinter
d = 100 m is the distance that must be covered
Solving for t, we find the minimum time needed:
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Answer:
See the answers below.
Explanation:
A transformer is a static electrical machine, it should be borne in mind that although the voltage can be increased or decreased, the power must always be equal.
For this case:
The power in the first coil can be calculated by means of the following formula.
where:
V = voltage = 12 [V]
I = current =2 [A]
a)
Therefore the power:
b)
Now in the second coil, the power must be the same:
They have the most kinetic energy in the middle of the curve
Answer:
a particular kind of matter with uniform properties.
Explanation:
Answer:
Point charge will be equal to
Explanation:
We have given distance of A from point charge
Distance of point B from point charge
We know that potential difference due to point charge is given as
So potential difference at point A
And potential difference at point B
We have given
So
So point charge will be equal to