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engineering
engineering mechanics dynamics

Questions and Answers of Engineering Mechanics Dynamics

Rod AB has weight W and is attached to two smooth collars at its ends by ball-and-socket joints. If collar A is moving downward with speed vA when z = a, determine the speed of A at the instant z =
The assembly consists of a rod AB of mass mAB which is connected to link OA and the collar at B by ball-and-socket joints. When θ = 0 and y = y1, the system is at rest, the spring is unstretched,
The thin plate of mass M is suspended at O using a ball-and-socket joint. It is rotating with a constant angular velocity ω = ω1k when the corner A strikes the hook at S, which provides a permanent
The assembly consists of a plate A of weight WA, plate B of weight WB, and four rods each of weight Wr. Determine the moments of inertia of the assembly with respect to the principal x, y, z axes.
The assembly consists of a rod AB of mass mAB which is connected to link OA and the collar at B by ball-and-socket joints. When θ = 0 and y = y1, the system is at rest, the spring is unstretched,
The circular plate has weight W and diameter d. If it is released from rest and falls horizontally a distance h onto the hook at S, which provides a permanent connection, determine the velocity of
The circular disk has weight W and is mounted on the shaft AB at angle θ with the horizontal. Determine the angular velocity of the shaft when t = t1 if a constant torque M is applied to the shaft.
The plate of weight W is subjected to force F which is always directed perpendicular to the face of the plate. If the plate is originally at rest, determine its angular velocity after it has rotated
The circular disk has weight W and is mounted on the shaft AB at angle of θ with the horizontal. Determine the angular velocity of the shaft when t = t1 if a torque M = M0ebt applied to the shaft.
The space capsule has mass mc and the radii of gyration are kx = kz and ky. If it is traveling with a velocity vG, compute its angular velocity just after it is struck by a meteoroid having mass mm
The rod assembly is supported by journal bearings at A and B, which develops only x and z force reactions on the shaft. If the shaft AB is rotating in the direction shown with angular velocity ω,
The rod assembly is supported by journal bearings at A and B, which develops only x and z force reactions on the shaft. If the shaft AB is subjected to a couple moment M0j and at the instant shown
The rod AB supports the sphere of weight W. If the rod is pinned at A to the vertical shaft which is rotating at a constant rate ωk, determine the angle θ of the rod during the motion. Neglect the
The conical pendulum consists of a bar of mass m and length L that is supported by the pin at its end A. If the pin is subjected to a rotation ω, determine the angle θ that the bar makes with the
The rod AB supports the sphere of weight W. If the rod is pinned at A to the vertical shaft which is rotating with angular acceleration α k, and at the instant shown the shaft has an angular
The thin rod has mass mrod and total length L. Only half of the rod is visible in the figure. It is rotating about its midpoint at a constant rate θ', while the table to which its axle A is fastened
The cylinder has mass mc and is mounted on an axle that is supported by bearings at A and B. If the axle is turning at ωj, determine the vertical components of force acting at the bearings at this
The cylinder has mass mc and is mounted on an axle that is supported by bearings at A and B. If the axle is subjected to a couple moment M j and at the instant shown has an angular velocity ωj,
A thin rod is initially coincident with the Z axis when it is given three rotations defined by the Euler angles φ, θ, and ψ. If these rotations are given in the order stated, determine the
The propeller on a single-engine airplane has a mass M and a centroidal radius of gyration kG computed about the axis of spin. When viewed from the front of the airplane, the propeller is turning
While the rocket is in free flight, it has a spin ωs and precesses about an axis measured angle θ from the axis of spin. If the ratio of the axial to transverse moments of inertia of the rocket is
The rotor assembly on the engine of a jet airplane consists of the turbine, drive shaft, and compressor. The total mass is mr, the radius of gyration about the shaft axis is kAB, and the mass center
An airplane descends at a steep angle and then levels off horizontally to land. If the propeller is turning clockwise when observed from the rear of the plane, determine the direction in which the
The conical top has mass M, and the moments of inertia are Ix = Iy and Iz. If it spins freely in the ball-and-socket joint at A with angular velocity ωs compute the precession of the top about the
The toy gyroscope consists of a rotor R which is attached to the frame of negligible mass. If it is observed that the frame is precessing about the pivot point O at rate ωp determine the angular
The top has weight W and can be considered as a solid cone. If it is observed to precessing about the vertical axis at a constant rate of ωy, determine its spin ωs. Given: W = 3 lb rad Oy = 5 S 8 =
The projectile has a mass M and axial and transverse radii of gyration kz and kt, respectively. If it is spinning at ωs when it leaves the barrel of a gun, determine its angular momentum. Precession
The disk of mass M is thrown with a spin ωz. The angle θ is measured as shown. Determine the precession about the Z axis. Given: M = 4 kg 8 = 160 deg r = 125 mm = 6 rad S
A spring has stiffness k. If a block of mass M is attached to the spring, pushed a distance d above its equilibrium position, and released from rest, determine the equation which describes the
If the lower end of the slender rod of mass M is displaced a small amount and released from rest, determine the natural frequency of vibration. Each spring has a stiffness k and is unstretched when
A weight W is suspended from a spring having a stiffness k. If the weight is given an upward velocity of v when it is distance d above its equilibrium position, determine the equation which describes
When a block of mass m1 is suspended from a spring, the spring is stretched a distance δ. Determine the natural frequency and the period of vibration for a block of mass m2 attached to the same
Determine to the nearest degree the maximum angular displacement of the bob if it is initially displaced θ0 from the vertical and given a tangential velocity v away from the vertical. Given: 80 =
The semicircular disk has weight W. Determine the natural period of vibration if it is displaced a small amount and released. Given: W = 20 lb r = 1 ft 8 = 32.2 ft 2
The square plate has a mass m and is suspended at its corner by the pin O. Determine the natural period of vibration if it is displaced a small amount and released.
The pointer on a metronome supports slider A of weight W, which is positioned at a fixed distance a from the pivot O of the pointer. When the pointer is displaced, a torsional spring at O exerts a
While standing in an elevator, the man holds a pendulum which consists of cord of length L and a bob of weight W. If the elevator is descending with an acceleration a, determine the natural period of
The disk, having weight W, is pinned at its center O and supports the block A that has weight WA. If the belt which passes over the disk is not allowed to slip at its contacting surface, determine
The spool of weight W is attached to two springs. If the spool is displaced a small amount and released, determine the natural period of vibration. The radius of gyration of the spool is kG. The
The disk, having weight W, is pinned at its center O and supports the block A that has weight WA. If the belt which passes over the disk is not allowed to slip at its contacting surface, determine
The semicircular disk has weight W. Determine the natural period of vibration if it is displaced a small amount and released. Solve using energy methods. Given: W = 20 lb r = 1 ft = 8-3222/22 S
The bar has length l and mass m. It is supported at its ends by rollers of negligible mass. If it is given a small displacement and released, determine the natural frequency of vibration. R B
The square plate has a mass m and is suspended at its corner by the pin O. Determine the natural period of vibration if it is displaced a small amount and released. Solve using energy methods.
The uniform rod of mass m is supported by a pin at A and a spring at B. If the end B is given a small downward displacement and released, determine the natural period of vibration. B
The disk of mass M is pin-connected at its midpoint. Determine the natural period of vibration of the disk if the springs have sufficient tension in them to prevent the cord from slipping on the disk
Determine the differential equation of motion of the block of mass M when it is displaced slightly and released. The surface is smooth and the springs are originally unstretched. Given: M = 3 kg k =
Determine the natural period of vibration of the sphere of mass M. Neglect the mass of the rod and the size of the sphere. Given: M = 3 kg k = 500 ZIE m a = 300 mm b = 300 mm
Determine the natural frequency of vibration of the disk of weight W. Assume the disk does not slip on the inclined surface. Given: W = : 20 lb
The slender rod has a weight W. If it is supported in the horizontal plane by a ball-and-socket joint at A and a cable at B, determine the natural frequency of vibration when the end B is given a
If the disk has mass M, determine the natural frequency of vibration. The springs are originally unstretched. Given: M = 8 kg N k = 400 r = 100 mm
Use a block-and-spring model like that shown in Fig. 22-14a but suspended from a vertical position and subjected to a periodic support displacement of δ = δ0 cos ωt, determine the equation of
The block of weight W is attached to a spring having stiffness k. A force F = F0 cosω t is applied to the block. Determine the maximum speed of the block after frictional forces cause the free
Determine the differential equation of motion of the spool of mass M. Assume that it does not slip at the surface of contact as it oscillates. The radius of gyration of the spool about its center of
If the block is subjected to the impressed force F = F0 cos(ωt), show that the differential equation of motion is y'' + (k/m)y = (F0/m)cos(ωt), where y is measured from the equilibrium position of
Draw the electrical circuit that is equivalent to the mechanical system shown. What is the differential equation which describes the charge q in the circuit? wwww 4 m
The circular disk of mass M is attached to three springs, each spring having a stiffness k. If the disk is immersed in a fluid and given a downward velocity v at the equilibrium position, determine
The light elastic rod supports the sphere of mass M. When a vertical force P is applied to the sphere, the rod deflects a distance d. If the wall oscillates with harmonic frequency f and has
The instrument is centered uniformly on a platform P, which in turn is supported by four springs, each spring having stiffness k. If the floor is subjected to a vibration f, having a vertical
The block of mass M is subjected to the action of the harmonic force F = F0cosωt. Write the equation which describes the steady-state motion. Given: M = 20 kg Fo = 90 N @=6 rad S k = 400 C =
The bottle of weight W rests on the check-out conveyor at a grocery store. If the coefficient of static friction is μs, determine the largest acceleration the conveyor can have without causing the
The assembly has mass ma and is hoisted using the boom and pulley system. If the winch at B draws in the cable with acceleration a, determine the compressive force in the hydraulic cylinder needed to
The fork lift has a boom with mass M1 and a mass center at G. If the vertical acceleration of the boom is aG, determine the horizontal and vertical reactions at the pin A and on the short link BC
The lift truck has mass mt and mass center at G. Determine the largest upward acceleration of the spool of mass ms so that no reaction of the wheels on the ground exceeds Fmax. Given: mt = = 70 kg mg
The lift truck has mass mt and mass center at G. If it lifts the spool of mass ms with acceleration a, determine the reactions of each of the four wheels on the ground. The loading is symmetric.
The pipe has mass M and is being towed behind a truck. Determine the acceleration of the truck and the tension in the cable. The coefficient of kinetic friction between the pipe and the ground is
The door has weight W and center of gravity at G. Determine the constant force F that must be applied to the door to push it open a distance d to the right in time t, starting from rest. Also, find
The car accelerates uniformly from rest to speed v in time t. If it has weight W and a center of gravity at G, determine the normal reaction of each wheel on the pavement during the motion. Power is
The pipe has mass M and is being towed behind the truck. If the acceleration of the truck is at, determine the angle θ and the tension in the cable. The coefficient of kinetic friction between the
The car of mass M shown has been “raked” by increasing the height of its center of mass to h This was done by raising the springs on the rear axle. If the coefficient of kinetic friction between
The forklift and operator have combined weight W and center of mass at G. If the forklift is used to lift the concrete pipe of weight Wp determine the maximum vertical acceleration it can give to the
The van has weight Wv and center of gravity at Gv. It carries fixed load Wl which has center of gravity at Gl. If the van is traveling at speed v, determine the distance it skids before stopping. The
The forklift and operator have combined weight W and center of mass at G. If the forklift is used to lift the concrete pipe of weight Wp determine the normal reactions on each of its four wheels if
The “muscle car” is designed to do a “wheeley”, i.e., to be able to lift its front wheels off the ground in the manner shown when it accelerates. If the car of mass M1 has a center of mass at
The rod of weight W is pin-connected to its support at A and has an angular velocity ω when it is in the horizontal position shown. Determine its angular acceleration and the horizontal and vertical
The fan blade has mass mb and a moment of inertia I0 about an axis passing through its center O. If it is subjected to moment M = A(1 − ebt) determine its angular velocity when t = t1 starting from
The disk of mass M is supported by a pin at A. If it is released from rest from the position shown, determine the initial horizontal and vertical components of reaction at the pin. Given: M = 80 kg g
The pendulum consists of a uniform plate of mass M1 and a slender rod of mass M2. Determine the horizontal and vertical components of reaction that the pin O exerts on the rod at the instant shown at
The bar of weight W is pinned at its center O and connected to a torsional spring. The spring has a stiffness k, so that the torque developed is M = kθ. If the bar is released from rest when it is
The pendulum consists of a disk of weight W1 and a slender rod of weight W2. Determine the horizontal and vertical components of reaction that the pin O exerts on the rod just as it passes the
The bar of weight w is pinned at its center O and connected to a torsional spring. The spring has a stiffness k, so that the torque developed is M = kθ. If the bar is released from rest when it is
The roll of paper of mass M has radius of gyration kA about an axis passing through point A. It is pin-supported at both ends by two brackets AB. If the roll rests against a wall for which the
The cylinder has a radius r and mass m and rests in the trough for which the coefficient of kinetic friction at A and B is μk. If a horizontal force P is applied to the cylinder, determine the
The bar has a mass m and length l. If it is released from rest from the position shown, determine its angular acceleration and the horizontal and vertical components of reaction at the pin O.
Disk D of weight W is subjected to counterclockwise moment M = bt. Determine the angular velocity of the disk at time t after the moment is applied. Due to the spring the plate P exerts constant
Determine the position of the center of percussion P of the slender bar of weight W. What is the horizontal force at the pin when the bar is struck at P with force F?Data from problem 65The kinetic
The disk has mass M and is originally spinning at the end of the strut with angular velocity ω. If it is then placed against the wall, for which the coefficient of kinetic friction is μk, determine
The variable-resistance motor is often used for appliances, pumps, and blowers. By applying a current through the stator S, an electromagnetic field is created that “pulls in” the nearest rotor
The relay switch consists of an electromagnet E and an armature AB (slender bar) of mass M which is pinned at A and lies in the vertical plane. When the current is turned off, the armature is held
A boy of mass mb sits on top of the large wheel which has mass mw and a radius of gyration kG. If the boy essentially starts from rest at θ = 0°, and the wheel begins to rotate freely, determine
The two-bar assembly is released from rest in the position shown. Determine the initial bending moment at the fixed joint B. Each bar has mass m and length l. A 1 в 1 C
The cord is wrapped around the inner core of the spool. If block B of weight WB is suspended from the cord and released from rest, determine the spool’s angular velocity when t = t1. Neglect the
The two blocks A and B have a mass mA and mB, respectively, where mB > mA. If the pulley can be treated as a disk of mass M, determine the acceleration of block A. Neglect the mass of the cord and
The wheel has mass M and radius of gyration kB. It is originally spinning with angular velocity ω1. If it is placed on the ground, for which the coefficient of kinetic friction is μc, determine the
A force F is applied perpendicular to the axis of the rod of weight W and moves from O to A at a constant rate v. If the rod is at rest when θ = 0° and F is at O when t = 0, determine the rod’s
Block A has a mass m and rests on a surface having a coefficient of kinetic friction μk. The cord attached to A passes over a pulley at C and is attached to a block B having a mass 2m. If B is
The slender rod of mass m is released from rest when θ = θ0. At the same instant ball B having the same mass m is released. Will B or the end A of the rod have the greatest speed when they pass the
The punching bag of mass M has a radius of gyration about its center of mass G of kG. If it is subjected to a horizontal force F, determine the initial angular acceleration of the bag and the tension
The trailer has mass M1 and a mass center at G, whereas the spool has mass M2, mass center at O, and radius of gyration about an axis passing through O kO. If a force F is applied to the cable,
The rocket has weight W, mass center at G, and radius of gyration about the mass center kG when it is fired. Each of its two engines provides a thrust T. At a given instant, engine A suddenly fails
The uniform board of weight W is suspended from cords at C and D. If these cords are subjected to constant forces FA and FB respectively, determine the acceleration of the board’s center and the

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