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ENGR 215 Exam 1 Solutions

# ENGR 215 Exam 1 Solutions - 5 OLYMPIC COLLEGE ENGR& 215...

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Unformatted text preview: 5 OLYMPIC COLLEGE ENGR& 215 Spring, 2011 Exam 1 Name Closed Book, Closed Notes A Calculator and an 8.5” X 11” paper with notes both sides permitted Show all work including 6 step method on these pages! 1. The jet plnae has a mass of 250,000 kg and a horizontal velocity of 100 m/s when t : 0. If each of the two engines provides a horizontal thrust which varies as shown in the graph, the plane’s velocity in 15 sis / A 2 MM . Neglect air resistance and loss of fuel during the motion. ________u-—r—m~—v=W—~"”W“‘Www 25 pts 1...“ \‘ (Kine) M,” ENGR& 215 Spring, 2011 ‘ Exam 1 2. If the crest of the hill has a radius of Curvature of 200 ft, the maximum constant speed at which the car can travel over it without leaving the surface of the road is ‘6 0 - 2 4"sz . Neglect the size of the car. The car weighs 3500 lb. Use Newton’s Second Law. 25 pts Half? eh (garin W1: ENGR& 215 7 * Spring, 2011 Exam 1 3. The 400-kg mine car is hoisted up the incline using the cable and motor M. For a short time, the force in the cable is F I (3200 t2) N, where t is in seconds. If the car has an intial velocity V1: 2 m/s when t = 0, its velocity whent = 2 s is ‘7 l M A . Use momentum methods. \ l ‘ llc W» : Q Woke/AEJVMWMA mi; 40% ’ \J: lM/A ‘ page3of4 K . ENGR& 215 Spring, 2011 Exam 1 4. The acceleration of a rocket traveling upward is given by a = (6 + 0.02 s) 111/32, where s is in meters. The rocket’s velocity when 5 Z 2 km is 37 22, “A {A . Initially, V = 0 and s = 0 when t = 0. 25pts \Iév :r “wand/4 WA 1“, I i gvjav —SU’+OOM M V- 0 ~- ﬁ )Vz} :[QWAIJr-QEQLA 0 ‘M if 2 it) {E Z 2 ,_ {A ; 3E a. GA Jr (9 O E W A :ZCQOOW‘ W 2”} : 152000 :3: ...
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