1. [-/1 Points] DETAILS SERPSE10 5.7.OP.016. 0/6 Submissions Used A 2.55-kg object is moving in a plane, with its x and y coordinates given by x = 7t - 4 and y = 4t + 1, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t = 1.65 s. Need Help? Read It Watch It 2. [-/3 Points] DETAILS SERPSE10 5.7.OP.017. 0/6 Submissions Used A bag of cement weighing 425 N hangs in equilibrium from three wires as suggested in the figure below. Two of the wires make angles 0, = 64.0 and 02 = 44.0 with the horizontal. Assuming the system is in equilibrium, find the tensions T1, T2, and 73 in the wires. T1= N T, = N T2 = N 82 T T2 CEMENT Ci Need Help? Read It Watch ItMY NOTES ASK YOUR TEACHER DETAILS SERPSE10 5.7.OP.019. 0/6 Submissions Used 3. [-/6 Points] In the figures, the masses are hung from an elevator ceiling. Assume the velocity of the elevator is constant. Find the tensions in the ropes (in N) for each case. Note that 0, = 35.0, 02 = 55.0, 03 = 57.00, m, = 5.00 kg, and my = 9.00 kg. (Due to the nature of this problem, do not use rounded intermediate values in your calculations-including answers submitted in WebAssign.) (a) TI T 2 T1= T, = Z Z T2 = (b) 0 3 TI T2 T1= N T 2 = Z N T 3 Need Help? Read It4. [-/4 Points] DETAILS SERPSE10 5.7.OP.021. 0/6 Submissions Used MY NOTES ASK YOUR TEACHER As part of an exercise routine, an athlete does a set of chin-ups. Shown is a graph of the athlete's vertical speed as she performs a chin-up. If her mass is 59.6 kg, calculate the force exerted by the chin-up bar on her hands for the given times. (Enter the magnitudes in N.) 30 20 speed (cm/s) 10 0.5 1.0 1.5 2.0 time (s) (a) t = 0 IN (b) t = 0.5s N (c) t = 1.1s IN (d) t = 1.6s IN Need Help? Read It