The position of a particle is given by the function x=(2t3−9t2+12)mx=(2t3−9t2+12)m, where tt is in ss. What is the particle's acceleration at this times? Express your answer using two significant figures. Enter your answers separated by commas.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?