Giancoli 5th Ed. Hwk 5 (Due 3/6/23) 10 point hwk Ch. 5 P. 1-3,6,7,19,23,35,36,38,45 MisConQ. (none) MisConQ Problems: 1. F_p = f_k =mu*m*g = 76 N If friction=0, then F_app = 0 N. 2. a) F_pull = f_s = mu_s*m*g so mu_s = 35/(4.0)(9.8) = 0.89 b) mu_s = 0.83 3. f_s,max >= ma -> mu_s >= 0.20 6. mg sin theta - f_k = ma_x so f_k = mg sin theta - ma_x = 102 N f_k = 0.47 7. a = (-f_s,max - mg sin theta) / m = -g(mu_s cos theta + sin theta) a = -5.3 m/s^2 19. a) a = (F_p - f_k)/(m1 + m2) with f_k=mu_k(m1+m2)*g a = 1.657 ~ 1.7 m/s^2 b) F_21 = 430 N (to right), F_12 = 430 N left c) a=1.7 m/s^2, F_12 = 220 N 23. m_Bg = f_k = mu_k m_A g -> m_A = m_B/mu_k = 2 kg/0.3 = 6.7 kg 35. F_c = mu_s mg -> v=sqrt(mu_s*r*g) = 24 m/s. Result is independent of the car's mass. 36. a) a_R =v^2/r = 1.21 m/s^2 b) F_R = ma_R = 22.5 kg * 1.207 m/s^2 = 27.2 N 38. a_R = v^2/r = 57.42 m/s^2 convert to g's -> 5.86 g's. 45. r = v^2 / mu_s*g = 28.1 m (or 30 m) Please check Tot= 10 pts Prob. 19,36 (1 pt, 1 pt) MiscQ. --- (0.5 pt each)