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engineering
engineering mechanics dynamics

Questions and Answers of Engineering Mechanics Dynamics

From experiments, the time variation of the vertical force on a runner’s foot as he strikes and pushes off the ground is shown in the graph. These results are reported for a 1-lb static load, i.e.,
The cabinet of weight W is subjected to the force F = a(bt+c). If the cabinet is initially moving up the plane with velocity v0, determine how long it will take before the cabinet comes to a stop. F
If it takes time t1 for the tugboat of mass mt to increase its speed uniformly to v1 starting from rest, determine the force of the rope on the tugboat. The propeller provides the propulsion force F
When the ball of weight W is fired, it leaves the ground at an angle θ from the horizontal and strikes the ground at the same elevation a distance d away. Determine the impulse given to the ball.
The uniform beam has weight W. Determine the average tension in each of the two cables AB and AC if the beam is given an upward speed v in time t starting from rest. Neglect the mass of the cables.
The block of mass M is moving downward at speed v1 when it is a distance h from the sandy surface. Determine the impulse of the sand on the block necessary to stop its motion. Neglect the distance
The block of mass M is falling downward at speed v1 when it is a distance h from the sandy surface. Determine the average impulsive force acting on the block by the sand if the motion of the block
A crate of mass M rests against a stop block s, which prevents the crate from moving down the plane. If the coefficients of static and kinetic friction between the plane and the crate are μs and
The block of weight W has an initial velocity v1 in the direction shown. If a force F = {f1i + f2j} acts on the block for time t, determine the final speed of the block. Neglect friction. Given: W =
The motor pulls on the cable at A with a force F = a + bt2. If the crate of weight W is originally at rest at t = 0, determine its speed at time t = t2. Neglect the mass of the cable and pulleys.
The log has mass M and rests on the ground for which the coefficients of static and kinetic friction are μs and μk respectively. The winch delivers a horizontal towing force T to its cable at A
The tennis ball has a horizontal speed v1 when it is struck by the racket. If it then travels away at angle θ from the horizontal and reaches maximum altitude h, measured from the height of the
A railroad car having mass m1 is coasting with speed v1 on a horizontal track. At the same time another car having mass m2 is coasting with speed v2 in the opposite direction. If the cars meet and
Car A has weight WA and is traveling to the right at speed vA Meanwhile car B of weight WB is traveling at speed vB to the left. If the cars crash head-on and become entangled, determine their common
The cart has mass M and rolls freely down the slope. When it reaches the bottom, a spring loaded gun fires a ball of mass M1 out the back with a horizontal velocity vbc measured relative to the cart.
The bus B has weight WB and is traveling to the right at speed vB. Meanwhile car A of weight WA is traveling at speed vA to the left. If the vehicles crash head-on and become entangled, determine
A box of weight W1 slides from rest down the smooth ramp onto the surface of a cart of weight W2. Determine the speed of the box at the instant it stops sliding on the cart. If someone ties the cart
A bullet of weight W1 traveling at speed v1 strikes the wooden block of weight W2 and exits the other side at speed v2 as shown. Determine the speed of the block just after the bullet exits the
A boy of weight W1 walks forward over the surface of the cart of weight W2 with a constant speed v relative to the cart. Determine the cart’s speed and its displacement at the moment he is about to
The projectile of weight W is fired from ground level with an initial velocity vA in the direction shown. When it reaches its highest point B it explodes into two fragments of weight W/2. If one
A bullet of weight W1 traveling at v1 strikes the wooden block of weight W2 and exits the other side at v2 as shown. Determine the speed of the block just after the bullet exits the block. Also,
The free-rolling ramp has a weight Wr. The crate, whose weight is Wc, slides a distance d from rest at A, down the ramp to B. Determine the ramp’s speed when the crate reaches B. Assume that the
The winch on the back of the jeep A is turned on and pulls in the tow rope at speed vrel. If both the car B of mass MB and the jeep A of mass MA are free to roll, determine their velocities at the
The block of mass Ma is held at rest on the smooth inclined plane by the stop block at A. If the bullet of mass Mb is traveling at speed v when it becomes embedded in the block of mass Mc, determine
The free-rolling ramp has a weight Wr. If the crate, whose weight is Wc, is released from rest at A, determine the distance the ramp moves when the crate slides a distance d down the ramp and reaches
The free-rolling ramp has a mass Mr. A crate of mass Mc is released from rest at A and slides down d to point B. If the surface of the ramp is smooth, determine the ramp’s speed when the crate
Disks A and B have masses MA and MB respectively. If they have the velocities shown, determine their velocities just after direct central impact. Given: MA = 2 kg MB = 4 kg e = 0.4 VAI = 2 VB1 =
Blocks A and B have masses mA and mB respectively. They are placed on a smooth surface and the spring connected between them is stretched a distance d. If they are released from rest, determine the
The collar B of weight WB is at rest, and when it is in the position shown the spring is unstretched. If another collar A of weight WA strikes it so that B slides a distance b on the smooth rod
The ball is dropped from rest and falls a distance h before striking the smooth plane at A. If the coefficient of restitution is e, determine the distance R to where it again strikes the plane at B.
The ball is dropped from rest and falls a distance h before striking the smooth plane at A. If it rebounds and in time t again strikes the plane at B, determine the coefficient of restitution e
A ball is thrown onto a rough floor at an angle of θ. If it rebounds at the same angle φ, determine the coefficient of kinetic friction between the floor and the ball. The coefficient of
The drop hammer H has a weight WH and falls from rest h onto a forged anvil plate P that has a weight WP. The plate is mounted on a set of springs that have a combined stiffness kT. Determine(a) The
A pitching machine throws the ball of weight M towards the wall with an initial velocity vA as shown. Determine(a) The velocity at which it strikes the wall at B,(b) The velocity at which it rebounds
The billiard ball of mass M is moving with a speed v when it strikes the side of the pool table at A. If the coefficient of restitution between the ball and the side of the table is e, determine the
The three balls each have the same mass m. If A is released from rest at θ, determine the angle φ to which C rises after collision. The coefficient of restitution between each ball is e. A B C
Two smooth billiard balls A and B each have mass M. If A strikes B with a velocity vA as shown, determine their final velocities just after collision. Ball B is originally at rest and the coefficient
The two disks A and B have a mass MA and MB, respectively. If they collide with the initial velocities shown, determine their velocities just after impact. The coefficient of restitution is e.
Determine the angular momentum of particle A of weight W about point O. Use a Cartesian vector solution. Given: W = 2 lb VA = 12 8 = 32.2 ft S ft 2 S a = 3 ft b = 2 ft c = 2 ft d = 4 ft
A box having a weight W is moving around in a circle of radius rA with a speed vA1 while connected to the end of a rope. If the rope is pulled inward with a constant speed vr, determine the speed of
The small cylinder C has mass mC and is attached to the end of a rod whose mass may be neglected. If the frame is subjected to a couple M = at2 + b, and the cylinder is subjected to force F, which is
The block of weight W is originally at rest on the smooth surface. It is acted upon by a radial force FR and a horizontal force FH, always directed at θ from the tangent to the path as shown.
The block of weight W rests on a surface for which the kinetic coefficient of friction is μk. It is acted upon by a radial force FR and a horizontal force FH, always directed at angle θ from the
A small particle having a mass m is placed inside the semicircular tube. The particle is placed at the position shown and released. Apply the principle of angular momentum about point O (ΣM0 = H0),
A toboggan and rider, having a total mass M, enter horizontally tangent to a circular curve (θ1) with a velocity vA. If the track is flat and banked at angle θ2, determine the speed vB and the
The boat of mass M is powered by a fan F which develops a slipstream having a diameter d. If the fan ejects air with a speed v, measured relative to the boat, determine the initial acceleration of
The rocket car has a mass MC (empty) and carries fuel of mass MF. If the fuel is consumed at a constant rate c and ejected from the car with a relative velocity vDR, determine the maximum speed
A power lawn mower hovers very close over the ground. This is done by drawing air in at speed vA through an intake unit A, which has cross-sectional area AA and then discharging it at the ground, B,
A rocket has an empty weight W1 and carries fuel of weight W2. If the fuel is burned at the rate c and ejected with a relative velocity vDR, determine the maximum speed attained by the rocket
The rocket has mass M including the fuel. Determine the constant rate at which the fuel must be burned so that its thrust gives the rocket a speed v in time t starting from rest. The fuel is expelled
If the chain is lowered at a constant speed v, determine the normal reaction exerted on the floor as a function of time. The chain has a weight W and a total length l. Given: W = 5 ft 1 = 20 ft ft v
The jet airplane of mass M has constant speed vj when it is flying along a horizontal straight line. Air enters the intake scoops S at rate r1. If the engine burns fuel at the rate r2 and the gas
The rope has a mass m' per unit length. If the end length y = h is draped off the edge of the table, and released, determine the velocity of its end A for any position y, as the rope uncoils and
The car has a mass m0 and is used to tow the smooth chain having a total length l and a mass per unit of length m'. If the chain is originally piled up, determine the tractive force F that must be
For a short time the bucket of the backhoe traces the path of the cardioid r = a(1 − cosθ). Determine the magnitudes of the velocity and acceleration of the bucket at θ = θ1 if the boom is
Determine the time needed for the load at B to attain speed v, starting from rest, if the cable is drawn into the motor with acceleration a. Given: v = -8 V EI m S
If the hydraulic cylinder at H draws rod BC in by a distance d, determine how far the slider at A moves. Given: d = 8 in
The pulley arrangement shown is designed for hoisting materials. If BC remains fixed while the plunger P is pushed downward with speed v, determine the speed of the load at A. Given: ft V v = 4- S
The crate is being lifted up the inclined plane using the motor M and the rope and pulley arrangement shown. Determine the speed at which the cable must be taken up by the motor in order to move the
If block A is moving downward with speed vA while C is moving up at speed vC, determine the speed of block B. Given: ft VA = 4- S
If block A is moving downward at speed vA while block C is moving down at speed vC, determine the relative velocity of block B with respect to C. Given: ft = 6- VC = 18 S VA = 6- ft S
If the point A on the cable is moving upwards at vA, determine the speed of block B. Given: VA || = -14 m S
If block A of the pulley system is moving downward with speed vA while block C is moving up at vC determine the speed of block B. Given: ft VA 4- = S || VC = -2 ft | S
The cylinder C is being lifted using the cable and pulley system shown. If point A on the cable is being drawn toward the drum with speed of vA, determine the speed of the cylinder. Given: VA = -2 m S
Collars A and B are connected to the cord that passes over the small pulley at C. When A is located at D, B is a distance d1 to the left of D. If A moves at a constant speed vA, to the right,
The motion of the collar at A is controlled by a motor at B such that when the collar is at sA, it is moving upwards at vA and slowing down at aA. Determine the velocity and acceleration of the cable
Vertical motion of the load is produced by movement of the piston at A on the boom. Determine the distance the piston or pulley at C must move to the left in order to lift the load a distance h. The
By using an inclined plane to retard the motion of a falling object, and thus make the observations more accurate, Galileo was able to determine experimentally that the distance through which an
Determine the gravitational attraction between two spheres which are just touching each other. Each sphere has a mass M and radius r. Given: r = 200 mm M = 10 kg G = 66.73 x 10 12 m³ 3 kg.si nN = 1
A bar B of mass M1, originally at rest, is being towed over a series of small rollers. Determine the force in the cable at time t if the motor M is drawing in the cable for a short time at a rate v =
A crate having a mass M falls horizontally off the back of a truck which is traveling with speed v. Determine the coefficient of kinetic friction between the road and the crate if the crate slides a
The crane lifts a bin of mass M with an initial acceleration a. Determine the force in each of the supporting cables due to this motion. Given: M = 700 kg a = 3 m 2 S b = 3 c = 4 kN = 10³ N
The crate of mass M is suspended from the cable of a crane. Determine the force in the cable at time t if the crate is moving upward with (a) a constant velocity v1 and (b) a speed of v = bt2 + c.
The fuel assembly of mass M for a nuclear reactor is being lifted out from the core of the nuclear reactor using the pulley system shown. It is hoisted upward with a constant acceleration such that s
The elevator E has a mass ME, and the counterweight at A has a mass MA. If the motor supplies a constant force F on the cable at B, determine the speed of the elevator at time t starting from rest.
The elevator E has a mass ME and the counterweight at A has a mass MA. If the elevator attains a speed v after it rises a distance h, determine the constant force developed in the cable at B. Neglect
The water-park ride consists of a sled of weight W which slides from rest down the incline and then into the pool. If the frictional resistance on the incline is Fr1 and in the pool for a short
Determine the normal force the crate A of mass M exerts on the smooth cart if the cart is given an acceleration a down the plane. Also, what is the acceleration of the crate? Given: M = 10 kg a a =
A car of mass m is traveling at a slow velocity v0. If it is subjected to the drag resistance of the wind, which is proportional to its velocity, i.e., FD = kv determine the distance and the time the
Each of the two blocks has a mass m. The coefficient of kinetic friction at all surfaces of contact is μ. If a horizontal force P moves the bottom block, determine the acceleration of the bottom
An engine of mass M1 is suspended from a spreader beam of mass M2 and hoisted by a crane which gives it an acceleration a when it has a velocity v. Determine the force in chains AC and AD during the
The driver attempts to tow the crate using a rope that has a tensile strength Tmax. If the crate is originally at rest and has weight W, determine the greatest acceleration it can have if the
The bullet of mass m is given a velocity due to gas pressure caused by the burning of powder within the chamber of the gun. Assuming this pressure creates a force of F = F0sin(πt/t0) on the bullet,
The cylinder of weight W at A is hoisted using the motor and the pulley system shown. If the speed of point B on the cable is increased at a constant rate from zero to vB in time t, determine the
A car is equipped with a bumper B designed to absorb collisions. The bumper is mounted to the car using pieces of flexible tubing T. Upon collision with a rigid barrier at A, a constant horizontal
The crate of mass M is subjected to forces F1 and F2, as shown. If it is originally at rest, determine the distance it slides in order to attain a speed v. The coefficient of kinetic friction between
Determine the required height h of the roller coaster so that when it is essentially at rest at the crest of the hill it will reach a speed v when it comes to the bottom. Also, what should be the
When the driver applies the brakes of a light truck traveling at speed v1 it skids a distance d1 before stopping. How far will the truck skid if it is traveling at speed v2 when the brakes are
The ball of mass M of negligible size is fired up the vertical circular track using the spring plunger. The plunger keeps the spring compressed a distance δ when x = 0. Determine how far x it must
The force F, acting in a constant direction on the block of mass M, has a magnitude which varies with the position x of the block. Determine how far the block slides before its velocity becomes v1.
The force F, acting in a constant direction on the block of mass M, has a magnitude which varies with position x of the block. Determine the speed of the block after it slides a distance d1 . When x
Determine the velocity of the block A of weight WA if the two blocks are released from rest and the block B of weight WB moves a distance d up the incline. The coefficient of kinetic friction between
Block A has weight WA and block B has weight WB. Determine the speed of block A after it moves a distance d down the plane, starting from rest. Neglect friction and the mass of the cord and pulleys.
The block A of weight WA rests on a surface for which the coefficient of kinetic friction is μk. Determine the distance the cylinder B of weight WB must descend so that A has a speed vA starting
The block of weight W slides down the inclined plane for which the coefficient of kinetic friction is μk. If it is moving at speed v when it reaches point A, determine the maximum deformation of the
The collar has mass M and rests on the smooth rod. Two springs are attached to it and the ends of the rod as shown. Each spring has an uncompressed length l. If the collar is displaced a distance s =
The block of mass M is subjected to a force having a constant direction and a magnitude F = k/(a+bx). When x = x1, the block is moving to the left with a speed v1. Determine its speed when x = x2.
The motion of a truck is arrested using a bed of loose stones AB and a set of crash barrels BC. If experiments show that the stones provide a rolling resistance Ft per wheel and the crash barrels
The collar has a mass M and is supported on the rod having a coefficient of kinetic friction μk. The attached spring has an unstretched length l and a stiffness k. Determine the speedof the collar
The block of weight W is released from rest at A and slides down the smooth circular surface AB. It then continues to slide along the horizontal rough surface until it strikes the spring. Determine

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