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assume that the rope is removed from the base of the ladder in problem 643 calculate the minimum angle at which the
compute the minimum weight of block b that will prevent the two-block system shown from sliding block a weighs 100 lb
a 47 lb body is supported on a plane inclined 33deg to the horizontal as shown the coefficient of static friction
a 325-lb block rests on a plane inclined 25deg with the horizontal calculate the coefficient of static friction between
a 50-lb block rests on a rough inclined plane if the coefficient of friction between the block and the plane is 050
a 1-ton weight rests on a horizontal floor the coefficient of static friction between the weight and the floor is 035
the tool locker of problem 63 is 08 m by 08 m square in plan and 2 m high determine the height above which a horizontal
1 a horizontal force of 18 lb is required to just start a 45-lb block in motion on a horizontal surface determine the
a weight w is to be held aloft by wrapping a rope around a horizontal stationary pole the coefficient of static
a square-threaded screw is used in a press shown to exert a pressure of 4000 lb the screw has a mean diameter of 3 in
a v-belt with a groove angle of 60deg drives a 037-m-diameter pulley on a small concrete mixer the contact angle is
the mean diameter of a square-threaded jackscrew is 300 in the pitch is 040 in and the coefficient of static friction
a 5-in-diameter steel sphere is rigidly attached to the end of a 24- in-long 1 1 2 -in-diameter aluminum rod locate the
a cylindrical cast-iron casting has an axial hole extending partway through the casting as shown locate the center of
a band brake is in contact with drum c through an angle of 180deg and is connected to the horizontal lever at a and b
a ship may exert an estimated pull of 8000 lb on its hawser a heavy rope which is wrapped around a mooring post on the
a machine having a mass of 500 kg is to be raised using a wedge as shown the coefficient of friction on all surfaces is
calculate the force p necessary to start the block c sliding upward as shown the coefficient of static friction for all
the end of a timber beam is to be lifted using a steel wedge at b as shown determine the force p that must be applied
the blocks shown are separated by a solid strut attached to the blocks with frictionless pins the coefficient of static
compute the minimum weight of block a shown for motion to be impending down the plane assume the pulley to be
in the figure shown block r has a mass of 90 kg and block q has a mass of 45 kg they are connected by a rope parallel
a built-up steel member is composed of a w21times62 wide-flange section with a c12times25 american standard channel
a 2-in-diameter hole 5 in long is drilled into the center of the top face of a steel cube that is 6 in on each side the