Jason knows that the equation to calculate the period of a simple pendium t=2π√l/8, where t is the period, l is the length of the rod and g is the acceleration due to gravity. he who knows that the frequency (f) of the pendulum is the reciprocal of period. how can he express l in terms of g and f?

Then the answer would be d then

Answerthe force between the charges will be  f/9 (one-ninth of force f)explanationcoulomb's law relates the magnitudes  two point charges q₁ and q₂, the distance, r, between the charges, and the electrostatic force, f, between the two charges:     k represents coulomb's constant, k = 8.99×10⁹ n·m²/c².note that if we have r = 3r, then   

Answermake them get very hot and over time wear them out;