Which of thWhich of the following is a true statement?
2 answers:
Answer:
B. Both electric fields and forces decrease in strength as the distance increases.
Explanation:
from the Coulomb's law
electrif field is also expressed as
F = qE., so
it can seen that electric force and electric field and dependent on distance. that is inverse square of distance.
so, if the electric force and eletric field decreases in strength, it is because the distance of separation has increased.
You might be interested in
Answer:
2.66m/s
Explanation:
information we have
power: 65W
work per step per kilogram: 0.60J
mass: 61kg
length of a running step: 1.5m
---------------
the formula for power is:
where W is the work and t is time.
time is also defined as:
so substituting this into the formula for power we get:
where v is the velocity we are looking for, d is the distance per step: , W is the work per step and P is power
.
we know that the work per step per kilogram is:
0.60J
so to find the work per step of his whole body we need to multiply the 0.60J by the 61 kilograms of his mas:
this is the work per step of the person.
So now we can calculate the velocity using the formula for power
clearing for v:
and substituting known values:
To solve this problem it is necessary to apply the kinematic equations of motion.
By definition we know that the position of a body is given by
Where
Initial position
Initial velocity
a = Acceleration
t= time
And the velocity can be expressed as,
Where,
For our case we have that there is neither initial position nor initial velocity, then
With our values we have , rearranging to find a,
Therefore the final velocity would be
Therefore the final velocity is 81.14m/s