Exam 2 Preparation relates recent midterms, Summaries of Engineering

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Exam 2 – ENGR 243 Preparation

Exam 2 - ENGR 243 Preparation At the instant @ = 60 ° the boy’s center of mass G has a downward speed Vc = 15 fs. Determine the rate of increase in his speed and the tension in each of the two supporting cords of the swing at this instant. The boy has a weight of 60 Ib. Neglect his size and the mass of the seat and cords Question 2 solution The jet aircraft has a total mass of 22 Mg and a center of mass at G. Initially at take-off the engines provide a thrust 27= 4 kN and 7”=1.5 kN Determine the acceleration of the plane and the normal reactions on the nose wheel and each of the nvo wing wheels located at B. Neglect the mass of the wheels and, due to low velocity, neglect any lift caused by the wings. The tire has a weight of 30 Ib and a radius of gyration of kc = 0.6 ft. If the coefficients of static and kinetic friction between the wheel and the plane are yw, = 0.2 and ux = 0.15, determine the tire’s angular acceleration as it rolls down the incline. Set @= 12°.