Answer
(a) $\mu_k = 0.75$
Work Step by Step
The correct answer is: (a) $\mu_k = 0.75$
Since the heater moves with a constant velocity, the force of kinetic friction must be equal in magnitude to the applied force of 600 N.
$F_N~\mu_k = 600~N$
$(800~N)~\mu_k = 600~N$
$\mu_k = 0.75$
