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civil engineering

Questions and Answers of Civil Engineering

Determine the smallest force P that will cause impending motion. The crate and wheel have a mass of 50 kg and 25 kg, respectively. The coefficient of static friction between the crate and the ground
Determine the smallest force P that will cause impending motion. The crate and wheel have a mass of 50 kg and 25 kg, respectively. The coefficient of static friction between the crate and the ground
Determine the smallest horizontal force P required to pull out wedge A. The crate has a weight of 300 lb and the coefficient of static friction at all contacting surfaces is ?s = 0.3.Neglect the
Determine the smallest horizontal force P required to lift the 200-kg crate. The coefficient of static friction at all contacting surfaces is ?s = 0.3. Neglect the mass of the wedge.
Determine the smallest horizontal force P required to lift the 100-kg cylinder. The coefficients of static friction at the contact points A and B are (?s)A = 0.6 and (?s)B = 0.2, respectively; and
The wedge has a negligible weight and a coefficient of static friction ?s = 0.35 with all contacting surfaces. Determine the largest angle ? so that it is ?self-locking.? This requires no slipping
Determine the smallest horizontal force P required to just move block A to the right if the spring force is 600 N and the coefficient of static friction at all contacting surfaces on A is ?s = 0.3.
The three stone blocks have weights of WA = 600 lb, WB = 150 lb, and WC = 500 lb. Determine the smallest horizontal force P that must be applied to block C in order to move this block. The
Determine the smallest horizontal force P required to move the wedge to the right. The coefficient of static friction at all contacting surfaces is ?s = 0.3. Set ? = 15o?and F = 400 N. Neglect the
If the horizontal force P is removed, determine the largest angle that will cause the wedge to be self-locking regardless of the magnitude of force F applied to the handle. The coefficient of static
Determine the smallest vertical force P required to hold the wedge between the two identical cylinders, each having a weight of W. The coefficient of static friction at all contacting surfaces is ?s
Determine the smallest vertical force P required to push the wedge between the two identical cylinders, each having a weight of W. The coefficient of static friction at all contacting surfaces is ?s
If the uniform concrete block has a mass of 500 kg, determine the smallest horizontal force P needed to move the wedge to the left. The coefficient of static friction between the wedge and the
The wedge blocks are used to hold the specimen in a tension testing machine. Determine the largest design angle ? of the wedges so that the specimen will not slip regardless of the applied load. The
The square threaded screw of the clamp has a mean diameter of 14 mm and a lead of 6 mm. If ?s = 0.2 for the threads, and the torque applied to the handle is 1.5 N ? m, determine the compressive force
The device is used to pull the battery cable terminal C from the post of a battery. If the required pulling force is 85 lb, determine the torque M that must be applied to the handle on the screw to
The jacking mechanism consists of a link that has a square-threaded screw with a mean diameter of 0.5 in. and a lead of 0.20 in., and the coefficient of static friction is ?s = 0.4. Determine the
Determine the magnitude of the horizontal force P that must be applied to the handle of the bench vise in order to produce a clamping force of 600 N on the block. The single square-threaded screw has
Determine the clamping force exerted on the block if a force of P = 30 N is applied to the lever of the bench vise. The single square-threaded screw has a mean diameter of 25 mm and a lead of 7.5 mm.
Determine the required horizontal force that must be applied perpendicular to the handle in order to develop a 900-N clamping force on the pipe. The single square-threaded screw has a mean diameter
If the clamping force on the pipe is 900 N, determine the horizontal force that must be applied perpendicular to the handle in order to loosen the screw. The single square-threaded screw has a mean
If the jack supports the 200-kg crate, determine the horizontal force that must be applied perpendicular to the handle at E to lower the crate. Each single square-threaded screw has a mean diameter
If the jack is required to lift the 200-kg crate, determine the horizontal force that must be applied perpendicular to the handle at E. Each single square-threaded screw has a mean diameter of 25 mm
Blocks A and B weigh 75 lb each, and D weighs 30 lb. Using the coefficients of static friction indicated, determine the frictional force between blocks A and B and between block A and the floorC.
A cylinder having a mass of 250 kg is to be supported by the cord which wraps over the pipe. Determine the smallest vertical force F needed to support the load if the cord passes (a) Once over the
A cylinder having a mass of 250 kg is to be supported by the cord which wraps over the pipe. Determine the largest vertical force F that can be applied to the cord without moving the cylinder. The
The boat has a weight of 500 lb and is held in position off the side of a ship by the spars at A and B.A man having a weight of 130 lb gets in the boat, wraps a rope around an overhead boom at C, and
The 100-lb boy at A is suspended from the cable that passes over the quarter circular cliff rock. Determine if it is possible for the 185-lb woman to hoist him up; and if this is possible, what
The 100-lb boy at A is suspended from the cable that passes over the quarter circular cliff rock. What horizontal force must the woman at A exert on the cable in order to let the boy descend at
A 10-kg cylinder D, which is attached to a small pulley B, is placed on the cord as shown. Determine the smallest angle so that the cord does not slip over the peg at C. The cylinder at E has a mass
A 10-kg cylinder D, which is attached to a small pulley B, is placed on the cord as shown. Determine the largest angle so that the cord does not slip over the peg at C. The cylinder at E has a mass
Determine the smallest lever force P needed to prevent the wheel from rotating if it is subjected to a torque of M = 250N ? m. The coefficient of static friction between the belt and the wheel is ?s
If a force of P = 200 N is applied to the handle of the bell crank, determine the maximum torque M that can be resisted so that the flywheel is not on the verge of rotating clockwise. The coefficient
Show that the frictional relationship between the belt tensions, the coefficient of friction ?, and the angular contacts ? and ? for the V-belt is T2 = T1e?B/sin(?/2).
Determine the force developed in spring AB in order to hold the wheel from rotating when it is subjected to a couple moment of M = 200 N ? m. The coefficient of static friction between the belt and
If the tension in the spring is FAB = 2.5kN, determine the largest couple moment that can be applied to the wheel without causing it to rotate. The coefficient of static friction between the belt and
The simple band brake is constructed so that the ends of the friction strap are connected to the pin at A and the lever arm at B. If the wheel is subjected to a torque of M = 80lb ? ft, determine the
A 180-lb farmer tries to restrain the cow from escaping by wrapping the rope two turns around the tree trunk as shown. If the cow exerts a force of 250 lb on the rope, determine if the farmer can
The uniform 50-lb beam is supported by the rope which is attached to the end of the beam, wraps over the rough peg, and is then connected to the 100-lb block. If the coefficient of static friction
The 80-kg man tries to lower the 150-kg crate using a rope that passes over the rough peg. Determine the least number of full turns in addition to the basic wrap (165?) around the peg to do the job.
If the rope wraps three full turns plus the basic wrap (165?) around the peg, determine if the 80-kg man can keep the 300-kg crate from moving. The coefficients of static friction between the rope
The drive pulley B in a video tape recorder is on the verge of slipping when it is subjected to a torque of M = 0.005 N ? m. If the coefficient of static friction between the tape and the drive wheel
Determine the maximum number of 50-lb packages that can be placed on the belt without causing the belt to slip at the drive wheel A which is rotating with a constant angular velocity. Wheel B is free
Blocks A and B have a mass of 7 kg and 10 kg, respectively. Using the coefficients of static friction indicated, determine the largest vertical force P which can be applied to the cord without
Block A has a weight of 100 lb and rests on a surface for which ?s = 0.25. If the coefficient of static friction between the cord and the fixed peg at C is ?s = 0.3, determine the greatest weight of
Block A has a mass of 50 kg and rests on surface B for which ?s = 0.25. If the coefficient of static friction between the cord and the fixed peg at C is ??s = 0.3, determine the greatest mass of the
Block A has a mass of 50 kg and rests on surface B for which ?s = 0.25. If the mass of the suspended cylinder D is 4 kg, determine the frictional force acting on A and check if motion occurs. The
The collar bearing uniformly supports an axial force of P = 500lb. If a torque of M = 3 lb ? ft is applied to the shaft and causes it to rotate at constant velocity, determine the coefficient of
If the spring exerts a force of 900 lb on the block, determine the torque M required to rotate the shaft. The coefficient of static friction at all contacting surfaces is ?s = 0.3.
The disk clutch is used in standard transmissions of automobiles. If four springs are used to force the two plates A and B together, determine the force in each spring required to transmit a moment
If P = 900 N is applied to the handle of the bell crank, determine the maximum torque M the cone clutch can transmit. The coefficient of static friction at the contacting surface is ?s = 0.3.
Because of wearing at the edges, the pivot bearing is subjected to a conical pressure distribution at its surface of contact. Determine the torque M required to overcome friction and turn the shaft,
The pivot bearing is subjected to a parabolic pressure distribution at its surface of contact. If the coefficient of static friction is ?s, determine the torque M required to overcome friction and
The shaft is subjected to an axial force P. If the reactive pressure on the conical bearing is uniform, determine the torque M that is just sufficient to rotate the shaft. The coefficient of static
The shaft of radius r fits loosely on the journal bearing. If the shaft transmits a vertical force P to the bearing and the coefficient of kinetic friction between the shaft and the bearing is ?k,
The pulley is supported by a 25-mm-diameter pin. If the pulley fits loosely on the pin, determine the smallest force P required to raise the bucket. The bucket has a mass of 20 kg and the coefficient
The pulley is supported by a 25-mm-diameter pin. If the pulley fits loosely on the pin, determine the largest force P that can be applied to the rope and yet lower the bucket. The bucket has a mass
The cylinders are suspended from the end of the bar which fits loosely into a 40-mm-diameter pin. If A has a mass of 10 kg, determine the required mass of B which is just sufficient to keep the bar
The cylinders are suspended from the end of the bar which fits loosely into a 40-mm-diameter pin. If A has a mass of 10 kg, determine the required mass of B which is just sufficient to keep the bar
The connecting rod is attached to the piston by a 0.75-in.-diameter pin at B and to the crank shaft by a 2-in.-diameter bearing A. If the piston is moving downwards, and the coefficient of static
The connecting rod is attached to the piston by a 20-mm-diameter pin at B and to the crank shaft by a 50-mm-diameter bearing A. If the piston is moving upwards, and the coefficient of static friction
The 5-kg pulley has a diameter of 240 mm and the axle has a diameter of 40 mm. If the coefficient of kinetic friction between the axle and the pulley is ?k = 0.15 determine the vertical force P on
Solve Prob. 8?132 if the force P is applied horizontally to the right.
The bell crank fits loosely into a 0.5-in-diameter pin. Determine the required force P which is just sufficient to rotate the bell crank clockwise. The coefficient of static friction between the pin
The bell crank fits loosely into a 0.5-in-diameter pin. If P = 41 lb, the bell crank is then on the verge of rotating counterclockwise. Determine the coefficient of static friction between the pin
The wagon together with the load weighs 150 lb. If the coefficient of rolling resistance is a = 0.03 in., determine the force P required to pull the wagon with constantvelocity.
Determine the force P required to overcome rolling resistance and pull the 50-kg roller up the inclined plane with constant velocity. The coefficient of rolling resistance is a = 15mm.
Determine the force P required to overcome rolling resistance and support the 50-kg roller if it rolls down the inclined plane with constant velocity. The coefficient of rolling resistance is a =
The 1.2-Mg steel beam is moved over a level surface using a series of 30-mm-diameter rollers for which the coefficient of rolling resistance is 0.4 mm at the ground and 0.2 mm at the bottom surface
Determine the smallest horizontal force P that must be exerted on the 200-lb block to move it forward. The rollers each weigh 50 lb, and the coefficient of rolling resistance at the top and bottom
A single force P is applied to the handle of the drawer. If friction is neglected at the bottom and the coefficient of static friction along the sides is ?s = 0.4, determine the largest spacing s
The semicircular thin hoop of weight W and center of gravity at G is suspended by the small peg at A.A horizontal force P is slowly applied at B. If the hoop begins to slip at A when ? = 30o,
Solve Prob. 8?145 if the truck and crate are traveling up a 10? incline.
If block A has a mass of 1.5 kg, determine the largest mass of block B without causing motion of the system. The coefficient of static friction between the blocks and inclined planes is ?s = 0.2.
The cone has a weight W and center of gravity at G. If a horizontal force P is gradually applied to the string attached to its vertex, determine the maximum coefficient of static friction for
The tractor pulls on the fixed tree stump. Determine the torque that must be applied by the engine to the rear wheels to cause them to slip. The front wheels are free to roll. The tractor weighs 3500
The tractor pulls on the fixed tree stump. If the coefficient of static friction between the rear wheels and the ground is ?s = 0.6, determine if the rear wheels slip or the front wheels lift off the
Column D is subjected to a vertical load of 8000 lb. It is supported on two identical wedges A and B for which the coefficient of static friction at the contacting surfaces between A and B and
Determine the mass and the location of the center of mass (x, y) of the uniform parabolic-shaped rod. The mass per unit length of the rod is 2kg>m.
The uniform rod is bent into the shape of a parabola and has a weight per unit length of 6 lb/ft. Determine the reactions at the fixed supportA.
Determine the distance to the center of mass of the homogeneous rod bent into the shape shown. If the rod has a mass per unit length of 0.5 kg/m, determine the reactions at the fixed supportO.
Determine the mass and locate the center of mass (x, y) of the uniform rod. The mass per unit length of the rod is 3kg>m.
Determine the mass and the location of the center of mass x of the rod if its mass per unit length is m = m0(1 +x/L).
Determine the location (x, y) of the centroid of the wire.
Locate the centroid of the circular rod. Express the answer in terms of the radius r and semiarc anglea.
Determine the area and the centroid (x, y) of thearea.
Determine the area and the centroid (x, y) of thearea.
Determine the area and the centroid (x, y) of thearea.
Determine the area and the centroid (x, y) of thearea.
Locate the centroid x of thearea.
Locate the centroid y of thearea.
Determine the area and the centroid (x, y) of thearea.
Determine the area and the centroid (x, y) of thearea.
Locate the centroid (x, y) of thearea.
Determine the area and the centroid (x, y) of thearea.
The plate is made of steel having a density of 7850 kg/m3. If the thickness of the plate is 10 mm, determine the horizontal and vertical components of reaction at the pin A and the tension in cableBC.
Determine the location x to the centroid C of the upper portion of the cardioid, r = a(1 - cos ?).
The plate has a thickness of 0.5 in. and is made of steel having a specific weight of 490 lb/ft3. Determine the horizontal and vertical components of reaction at the pin A and the force in the cord
Locate the centroid x of the shadedarea.
Locate the centroid x of thearea.

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