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Material Type: Exam; Class: Dynamics; Subject: Engineering; University: Harford Community College; Term: Fall 2006;
Typology: Exams
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The 100-kg beam BD is supported by two rods having the negligible mass. Determine the force created in each rod if at the instant θ = 30O^ the rods are both rotating with an angular velocity of = 6 rad/s. Answer : TB = TD = 1.33 kN
The uniform slender pole shown has a mass of 100 kg and a moment of inertia of IG = 75 kg.m2. If the coefficient of static and kinetic friction between the end of the pole and the surface are μs = 0.3 and μk= 0.25, respectively, determine the pole’s angular acceleration at the instant the 400-N horizontal force is applied. The pole is originally at rest. (Hint: assume no slipping, test assumption) Answer : 0.428 rad/s^2 CCW
Problem #4: The 40-kg bullet is fired with a horizontal velocity of 600 m/s into the lower end of a slender 7-kg bar of length L = 600 mm. Knowing that h = 240 mm and the bar is initially at rest, determine (a) the angular velocity of the bar immediately after the bullet becomes embedded, (b) the impulsive reaction at C, assuming that the bullet becomes embedded in 0.001 s. Answers : a. ω = 35.9 rad/s CW b. C = 8.39 kN
