A cable is attached to the 20-kg plate B, passes over a fixed peg at C, and is attached to the block at A. Using the coefficients of static friction shown, determine the smallest mass of block A so that it will prevent sliding motion of B down the plane. 30 B A mA 0.2 mC 0.3 C mB 0.3 Prob. 889

ME 3600 Notes – Week 6 Chapter 8: Signals Periodic: To repeat regularly over a period of time or space y(t+T =y(t) yt)=Asin(ωt+ϕ) [rad ] A=Amplitude ω=circular frequency s ω=2πf t=time [s]Φ=phase [rad] f=frequency [Hz=1/s] 2π 1 = T=period [s]= ω f 2 2 yt)=Acos (ωt)+Bsin ωt =Ccos ωt+ϕ ) C=√(A +B ) −1B π ϕ=tan A = 2 −ϕ A usually associated with cosine, B with sine