Answer:
Double the first charge to 2Q
Explanation:
F = C q1 q2 / r^2 multiply both sides by 2 ( to double the force)
2F = C * 2 (q1)(q2) / r^2 <==== so doubling either q will double the force
Rolling without slipping means V=rw where w is angular velocity. So 4.0=0.1w
w=40rad/s
When there is a temperature difference/Gradient, heat flows from a region of high concentration to region of low concentration.
<h3>Energy and Heat/Mass Transfer</h3>
Thermal energy flow from region of higher temperature gradient to region of low temperature gradient till equilibrium is reached.
When the hot metal is places in a cold water bath, there will be a temperature difference and by conduction(water conducts heat) the heat will travel in the water medium and circulate till equilibrium
Learn more about heat and mass transfer here:
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