A river is to be crossed by a boy using a row boat Rowing Speed Direction of A Boat F K River Velocity B Assume that the water has uniform velocity, represented above by the vector labeled J. The rowing speed of the boy and a set of possible orientation of his boat are also shown. Select the direction (i.e., A, or C, or ...) in order to cross the river in the shortest time. (Notice that the number of tries is reduced.) You are correct. Your receipt no. is 156-7677 2 Previous Tries For which rowing orientation will the boy land on the opposite shore directly across from his starting position, neither upstream or downstream. (Notice that the number of tries is reduced.) C You are correct. Your receipt no. is 156-7786 2 Previous Tries Select an answer for each .... below. Equal to Time to row across for B is .... for A. Greater than | Time to row across for B is .... for C. Greater than Time to row across for His .... for A. Equal to The distance traveled in crossing for A is .... for B. Less than For an observer on shore, the speed of the boat for K is .... for F. Submit Answer Incorrect. Tries 17/20 Previous TriesA pendulum has a length L = 1.12 m. It hangs straight down in a jet plane about to take off as shown by the dotted line in the figure. Acceleration L D As the jet accelerates uniformly during take-off, the pendulum deflects horizontally by D = 0.450 m to a new equilibrium position. Calculate the magnitude of the plane's acceleration. Method 1: Use Newton's 2nd Law. Method 2: Use the Gravitational Equivalence principle. A body in a system with acceleration a behaves as if it were in a gravity field -a. The - sign indicates the field is in the direction opposite the acceleration. Submit Answer Incorrect. Tries 2/20 Previous Tries- ~ el The initial velocity of a 1.39 kg block sliding down a frictionless inclined plane is found to be 1.26 m/s. Then 1.78 s later, it has a velocity of 6.88 m/s. What is the angle of the plane with respect to the horizontal? Mass m1 = 13.1 kg is on a horizontal surface. Mass m2 = 7.08 kg hangs freely on a rope which is attached to the first mass. The coefficient of static friction between mj and the horizontal surface is us = 0.484, while the coefficient of kinetic friction is MK = 0.175. m1 m, If the system is in motion with my moving to the left, then what will be the magnitude of the system's acceleration? Consider the pulley to be massless and frictionless.The three blocks shown are relased at t=0 from the position shown in the figure. Assume that there is no friction between the table and My, and that the two pulleys are massless and frictionless. The masses are: M = 3.0 kg, My = 7.0 kg, M3 = 5.0 kg. My Calculate the speed of M, at a time 1.65 s after the system is released from rest. Incorrect. Tries 2/20 Previous Tries &) Post Discussion #; Send Feedback 4 In the figure, M2 has more mass than M1 and M1 has more mass than M3. The questions refer to the magnitudes of tensions and weights. M2 12 T3 T1 T4 MI M3 There is friction between the horizontal plane and M2 (uk # 0). M2 is observed to travel at a constant speed. Assume that the pulleys are frictionless and have negligible mass. Select the appropriate statements to complete the following sentences. M3 accelerates upwards. Mig is ... T1 Mag is ... T4 T2 is ... T1. T2 is ... T3. The magnitude of the net force on M2 is T2 - T3. Submit Answer Tries 0/20 Post Discussion Send Feedback