Two circles have the same center. circle p has a radius of p units. circle q has a radius of q units. which dilation could be used to prove that circles p and q are similar?

a. dilate circle p by a scale factor of p/q.

b. dilate circle q by a scale factor of p/q.

c. dilate circle p by a scale factor of p × q .

d. dilate circle q by a scale factor of p × q .

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).