Explanation:
Resistance is defined as the ability of a substance to resist the flow of current through the substance. Formula to calculate resistance is as follows.
R =
As outer surface of a wire is in the shape of sphere. therefore, its area will be as follows.
A =
or, A =
where, d = diameter of the sphere
This means that with increase in diameter of a conductor there will occur an increase in area of the wire. As area is inversely proportional to resistance so, increase in area will lead to a decrease in resistance.
On the other hand, relation between resistivity and temperature is as follows.
where, = resistivity
d = mean free path of electrons
A = amplitude of atomic vibrations
T = temperature
Also, resistivity is directly proportional to resistance. So, with increase in temperature there will occur an increase in resistance of the conductor.
Thus, we can conclude that only technician B is correct.
Answer:
<h2>39.15 N</h2>
Explanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 14.5 × 2.7
We have the final answer as
<h3>39.15 N</h3>
Hope this helps you
Answer:
Explanation:
Work = Force times displacement. Therefore,
W = 3150(75.5) so
W = 238000 N*m
Answer:
3.33 m/s²
Explanation:
If the acceleration is constant, it is equal to the average acceleration:
a = Δv / Δt
First, convert km/hr to m/s:
300 km/hr × (1 hr / 3600 s) × (1000 m/km) = 83.33 m/s
a = (83.33 m/s − 0 m/s) / 25 s
a = 3.33 m/s²