Engineering Mechanics: Dynamics
8th Edition
ISBN: 9781118885840
Author: James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher: WILEY
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Chapter 7.12, Problem 128RP
To determine
The angular momentum
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6/86 The connecting rod AB of a certain internal-combustion engine weighs 1.2 lb with mass center at G
and has a radius of gyration about G of 1.12 in. The piston and piston pin A together weigh 1.80 lb. The
engine is running at a constant speed of 3000 rev/min, so that the angular velocity of the crank is
3000(2)/60 = 100л rad/sec. Neglect the weights of the components and the force exerted by the gas in
the cylinder compared with the dynamic forces generated and calculate the magnitude of the force on the
piston pin A for the crank angle 0 = 90°. (Suggestion: Use the alternative moment relation, Eq. 6/3, with B
as the moment center.)
Answer
A = 347 lb
3"
1.3"
B
1.7"
PROBLEM 6/86
6/85 In a study of head injury against the instrument panel of a car during sudden or crash stops where
lap belts without shoulder straps or airbags are used, the segmented human model shown in the figure is
analyzed. The hip joint O is assumed to remain fixed relative to the car, and the torso above the hip is
treated as a rigid body of mass m freely pivoted at O. The center of mass of the torso is at G with the initial
position of OG taken as vertical. The radius of gyration of the torso about O is ko. If the car is brought to a
sudden stop with a constant deceleration a, determine the speed v relative to the car with which the
model's head strikes the instrument panel. Substitute the values m = 50 kg, 7 = 450 mm, r = 800 mm, ko
= 550 mm, 0 = 45°, and a = 10g and compute v.
Answer
v = 11.73 m/s
PROBLEM 6/85
Chapter 7 Solutions
Engineering Mechanics: Dynamics
Ch. 7.5 - Place your textbook on your desk, with fixed axes...Ch. 7.5 - Repeat the experiment of Prob. 7/1 but use a small...Ch. 7.5 - Prob. 3PCh. 7.5 - A timing mechanism consists of the rotating...Ch. 7.5 - Prob. 5PCh. 7.5 - Prob. 6PCh. 7.5 - Prob. 7PCh. 7.5 - Prob. 8PCh. 7.5 - Prob. 9PCh. 7.5 - Prob. 10P
Ch. 7.5 - Prob. 11PCh. 7.5 - Prob. 12PCh. 7.5 - Prob. 13PCh. 7.5 - In manipulating the dumbbell, the jaws of the...Ch. 7.5 - Prob. 15PCh. 7.5 - Prob. 16PCh. 7.5 - For the robot of Prob. 7/16, determine the angular...Ch. 7.5 - Prob. 18PCh. 7.5 - Prob. 19PCh. 7.5 - The circular disk of 120-mm radius rotates about...Ch. 7.5 - Prob. 21PCh. 7.5 - Prob. 22PCh. 7.5 - Prob. 23PCh. 7.5 - Prob. 24PCh. 7.5 - Prob. 25PCh. 7.5 - Prob. 26PCh. 7.5 - The pendulum oscillates about the x-axis according...Ch. 7.5 - Prob. 28PCh. 7.6 - Prob. 29PCh. 7.6 - Prob. 30PCh. 7.6 - Prob. 31PCh. 7.6 - Prob. 32PCh. 7.6 - Prob. 33PCh. 7.6 - Prob. 34PCh. 7.6 - Prob. 35PCh. 7.6 - Prob. 36PCh. 7.6 - Prob. 37PCh. 7.6 - Prob. 38PCh. 7.6 - Prob. 39PCh. 7.6 - Prob. 40PCh. 7.6 - Prob. 41PCh. 7.6 - Prob. 42PCh. 7.6 - Prob. 43PCh. 7.6 - Prob. 44PCh. 7.6 - Prob. 45PCh. 7.6 - Prob. 46PCh. 7.6 - The center O of the spacecraft is moving through...Ch. 7.6 - Prob. 48PCh. 7.6 - Prob. 49PCh. 7.6 - Prob. 50PCh. 7.6 - Prob. 51PCh. 7.6 - Prob. 52PCh. 7.8 - Prob. 53PCh. 7.8 - Prob. 54PCh. 7.8 - The aircraft landing gear viewed from the front is...Ch. 7.8 - Prob. 56PCh. 7.8 - Prob. 57PCh. 7.8 - Prob. 58PCh. 7.8 - Prob. 59PCh. 7.8 - Prob. 60PCh. 7.8 - Prob. 61PCh. 7.8 - Prob. 62PCh. 7.8 - Prob. 63PCh. 7.8 - Prob. 64PCh. 7.8 - Prob. 65PCh. 7.8 - Prob. 66PCh. 7.8 - Prob. 67PCh. 7.8 - Prob. 68PCh. 7.8 - Prob. 69PCh. 7.8 - Prob. 70PCh. 7.8 - The assembly, consisting of the solid sphere of...Ch. 7.8 - Prob. 72PCh. 7.10 - Prob. 73PCh. 7.10 - The slender shaft carries two offset particles,...Ch. 7.10 - Prob. 75PCh. 7.10 - Prob. 76PCh. 7.10 - Prob. 77PCh. 7.10 - Prob. 78PCh. 7.10 - Prob. 79PCh. 7.10 - Prob. 80PCh. 7.10 - Prob. 81PCh. 7.10 - Prob. 82PCh. 7.10 - Prob. 83PCh. 7.10 - Prob. 84PCh. 7.10 - Prob. 85PCh. 7.10 - Prob. 86PCh. 7.10 - The thin circular disk of mass m and radius R is...Ch. 7.10 - Prob. 88PCh. 7.10 - Prob. 89PCh. 7.10 - Prob. 90PCh. 7.10 - Prob. 91PCh. 7.10 - Prob. 92PCh. 7.10 - Prob. 93PCh. 7.10 - Prob. 94PCh. 7.11 - Prob. 95PCh. 7.11 - Prob. 96PCh. 7.11 - Prob. 97PCh. 7.11 - The 50-kg wheel is a solid circular disk which...Ch. 7.11 - The special-purpose fan is mounted as shown. The...Ch. 7.11 - Prob. 100PCh. 7.11 - Prob. 101PCh. 7.11 - Prob. 102PCh. 7.11 - Prob. 103PCh. 7.11 - Prob. 104PCh. 7.11 - Prob. 105PCh. 7.11 - Prob. 106PCh. 7.11 - Prob. 107PCh. 7.11 - Prob. 108PCh. 7.11 - Prob. 109PCh. 7.11 - Prob. 110PCh. 7.11 - Prob. 111PCh. 7.11 - Prob. 112PCh. 7.11 - Prob. 113PCh. 7.11 - Prob. 114PCh. 7.11 - Prob. 115PCh. 7.11 - Prob. 116PCh. 7.11 - Prob. 117PCh. 7.11 - Prob. 118PCh. 7.11 - Prob. 119PCh. 7.11 - Prob. 120PCh. 7.11 - Prob. 121PCh. 7.11 - The uniform slender bar of mass m and length l is...Ch. 7.11 - Prob. 123PCh. 7.11 - Prob. 124PCh. 7.11 - Prob. 125PCh. 7.11 - Prob. 126PCh. 7.12 - Prob. 127RPCh. 7.12 - The solid cube of mass m and side a revolves about...Ch. 7.12 - Prob. 129RPCh. 7.12 - Prob. 130RPCh. 7.12 - Prob. 132RPCh. 7.12 - The solid cone of mass m, base radius r, and...Ch. 7.12 - Prob. 135RPCh. 7.12 - Prob. 136RPCh. 7.12 - Prob. 137RPCh. 7.12 - Prob. 138RPCh. 7.12 - Prob. 139RPCh. 7.12 - Prob. 140RPCh. 7.12 - Prob. 141RPCh. 7.12 - Prob. 142RPCh. 7.12 - Prob. 143RPCh. 7.12 - Prob. 144RPCh. 7.12 - Prob. 145RPCh. 7.12 - Prob. 146RP
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