Elementary Dynamics Equation Sheet: Oklahoma State University Engineering Science 2123 - P, Exams of Dynamics

Download Elementary Dynamics Equation Sheet: Oklahoma State University Engineering Science 2123 - P and more Exams Dynamics in PDF only on Docsity! Name / DS. Oklahoma State University Engineering Science 2123 Elementary Dynamics Spring 2013 - Exam 2 1. (25) A 10-Ib suitcase slides down the curved ramp for which the coefficient of kinetic friction is uy, = 0.2. If at the instant it reaches point A it has a speed of 5 ft/s, determine the normal force on the suitcase and the rate of increase of its speed. sey Ke Zp = Man 2 N- /0 ces afIP_ \ £ el al =-/1S= Gn, - a8) * 4 2 xe-b — Pe N= 6.83 Ib ~, ° . @= - $4.3 ZF mM Ay 74-1 = Up Nt 1D 5AOH dx 4 as aud DZ N+4/DSAB= et im Se A * 23.0 Fy,2 Name / DS. 2. (25) Rod OA rotates counterclockwise with a constant angular velocity of 6 =5rad/s. The double collar B is pin-connected together such that one collar slides over the rotating rod and the other slides over the horizontal curved rod, of which the shape is described by the equation r = 1.5(2 —cos@)ft. If both collars together weigh 0.75 lb, determine the normal force which the curved rod exerts on the one collar at the instant @ = 120°. Neglect friction. ~ \p\N “NU Ge Pe JW/\6 Fr /.S(Z-t0s 0) ) & LS Stn 1r=15(2-coso) ft ES = Z.87 ie 28, = 7d.9° = 48 (2-cos6) = 3.78 Et. TSO 5.0 = 6Sd Ets of oe a “2 Ces 1S (B50 +e cos)” = —1B.7S fU/s* avd B= 1Z%./° 3°, Ar=c-v~e* = 112.8 Ft/)s= 2. Fe = MAY —W cos B “(yew 32-2 —® P= 2.77 Ib