Name the two spectral windows through which electromagnetic radiation easily reaches the surface of earth and describe the largest-aperture telescope currently in use for each window.

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?

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?