Molecular motors are often studied by attaching them to small plastic spheres. These spheres enable the motor’s motion to be observed with a microscope and are much larger than the motor. Consider a molecular motor to which a plastic sphere of radius 20 nm is attached. As the motor moves through water, a drag force given by Equation 3.23 acts on the sphere. If the molecular motor is able to produce a power output of 1 × 10^–17 W, what is the speed of the motor as it pulls the sphere through water?