Consider a continuous time signal, x(t) = ∑ Ai 5 i=1 cos(2πFi t + θi), consisting of a sum of sinusoidal signals of frequencies 100 Hz, 350 Hz, 900 Hz, 1.95 KHz, and 5.35 KHz. Find the discrete time sequence, x(n), obtained by sampling x(t) at a rate of 1.2 KHz. (Note: you must take care of aliasing, if any)

Atennis player used a tennis racket to hit a tennis ball with a mass of 0.25 kg with a force of 5.25 newtons. how does the force the tennis racket exerted on the tennis ball compare with the force the tennis ball exerted on the tennis racket? a. the force of the tennis racket on the tennis ball is equal in magnitude and opposite in direction to the force the tennis ball exerted on the tennis racket. b. the force of the tennis racket on the tennis ball is equal in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. c. the force of the tennis racket on the tennis ball is less in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. d. the force of the tennis racket on the tennis ball is greater in magnitude and opposite in direction as the force the tennis ball exerted on the tennis racket.