WAEC - Physics (2012 - No. 5)
A metal ball of weight W falls through a column of glycerine of viscosity V. If the ball experiences an upthrust U and terminal velocity is attained, then
W > U + V
W = U + V
W = U - V
W < U + V
解释
When terminal velocity is attained, The equation of motion becomes
mg - V - U = 0
\(\therefore\) mg = W = U + V