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Unformatted text preview: TEST #2 DYNAMICS Name: 1) A conical vessel is spinning about the vertical axis at 180 rpm. Find the radius R for
which the object of mass m will not slide down the ramp. The coefficient of static friction " is 0.3 and the kinetic friction is 0.2 BOX IN YOUR ANSWERS SCORE 1)
2)
3) 4) 2) A 201b block B slides along a vertical rod with a constant frictional force of 70 lbs. Two
springs are attached to the block as shown. The stiffness of each spring is 30 lbs/ft. The
vertical spring at C is initially unstretched, whereas the unstretched length of the
horizontal spring is 3 feet. A force of F = (60 + 805) is applied to the block to move it
vertically 8 feet. If the system starts from rest, ﬁnd: a) the force that the horizontal spring
initially applies to the block, b) speed after the block has traveled the 8 feet to point D. BOX IN YOUR ANSWERS 3) A pilot in a vertical dive turns off the engine at 400 mph and goes into a vertical loop of
900 ft radius. Neglecting air resistance, ﬁnd: a) the speed at the top of the loop, assuming a circular loop, b) diameter of the largest loop the pilot can make without losing all the
plane’s speed. BOX IN YOUR ANSWERS ——.._.. engine cutoff 4) Block A weighing 64.4 lbs, compresses the spring of stiffness 2001bs/ft, two feet as
shown. Block slides along a frictionless curved section of radius 4 feet. Once on the
horizontal section block A slides on a surface with a coefficient of friction of 0.2 for 10 v
feet before hitting block B which is initially at rest. Block B weighs 128.8 lbs. After the
impact B slides to the right along a frictionless surface until it is stopped by a spring of
unknown stiffness. The amount of compression of the second spring is 2 feet. Find: a)
speed of A at the position 2, b) speed of A before impact, b) speed of A and B after_ impact, c) spring constant of the right spring. The coefficient of restitution between A and
B is 0.8. ...
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 Winter '08
 Unknown
 Dynamics

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