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engineering
engineering mechanics dynamics

Questions and Answers of Engineering Mechanics Dynamics

The leaf blower draws in air at a rate of 400 ft3/min and discharges it at a speed v = 240 mi / hr. If the specific weight of the air being drawn into the blower is 7.53(10−2) lb /ft3, determine
The ducted fan unit of mass m is supported in the vertical position on its flange at A. The unit draws in air with a density ρ and a velocity u through section A and discharges it through section B
The fi re hydrant is tested under a high standpipe pressure. The total flow of 10 ft3/sec is divided equally between the two outlets, each of which has a cross-sectional area of 0.040 ft2. The inlet
A rotary snow plow mounted on a large truck eats its way through a snow drift on a level road at a constant speed of 20 km/h. The plow discharges 60 Mg of snow per minute from its 45° chute with a
Salt water flows through the fixed 12-in.-insidediameter pipe at a speed v0 = 4 ft/sec and enters the 150° bend with inside radius of 24 in. The water exits to the atmosphere through the
The industrial blower sucks in air through the axial opening A with a velocity v1 and discharges it at atmospheric pressure and temperature through the 150-mm-diameter duct B with a velocity v2. The
The feasibility of a one-passenger VTOL (vertical takeoff and landing) craft is under review. The preliminary design calls for a small engine with a high power-to-weight ratio driving an air pump
The helicopter shown has a mass m and hovers in position by imparting downward momentum to a column of air defined by the slipstream boundary shown. Find the downward velocity v given to the air by
The sprinkler is made to rotate at the constant angular velocity ω and distributes water at the volume rate Q. Each of the four nozzles has an exit area A. Water is ejected from each nozzle at an
The VTOL (vertical takeoff and landing) military aircraft is capable of rising vertically under the action of its jet exhaust, which can be “vectored” from θ ≅ 0 for takeoff and hovering to θ
A marine terminal for unloading bulk wheat from a ship is equipped with a vertical pipe with a nozzle at A which sucks wheat up the pipe and transfers it to the storage building. Calculate the x- and
An axial section of the suction nozzle A for a bulk wheat unloader is shown here. The outer pipe is secured to the inner pipe by several longitudinal webs which do not restrict the flow of air. A
The valve, which is screwed into the fixed pipe at section A-A, is designed to discharge fresh water at the rate of 340 gal/min into the atmosphere in the x-y plane as shown. Water pressure at A-A is
In the figure is shown a detail of the stationary nozzle diaphragm A and the rotating blades B of a gas turbine. The products of combustion pass through the fixed diaphragm blades at the 27° angle
When the rocket reaches the position in its trajectory shown, it has a mass of 3 Mg and is beyond the effect of the earth’s atmosphere. Gravitational acceleration is 9.60 m/s2. Fuel is being
At the instant of vertical launch the rocket expels exhaust at the rate of 220 kg/s with an exhaust velocity of 820 m/s. If the initial vertical acceleration is 6.80 m/s2, calculate the total mass of
Consider the system of Prob. 3/311 where the mass of the ball is m = 10 kg and the length of the light rod is l = 0.8 m. The ball–rod assembly is free to rotate about a vertical axis through O. The
The bungee jumper, an 80-kg man, falls from the bridge at A with the bungee cord secured to his ankles. He falls 20 m before the 17-m length of elastic bungee cord begins to stretch. The 3 m of rope
The system is released from rest with the spring initially stretched 25 mm. Calculate the velocity v of the 60-kg cart after it has moved 100 mm down the incline. Also determine the maximum distance
A short train consists of a 400,000-lb locomotive and three 200,000-lb hopper cars. The locomotive exerts a constant friction force of 40,000 lb on the rails as the train starts from rest. (a)
A car of mass m is traveling at a road speed vr along an equatorial east–west highway at sea level. If the road follows the curvature of the earth, derive an expression for the difference ΔP
The retarding forces which act on the race car are the drag force FD and a nonaerodynamic force FR. The drag force is FD = CD (1/2 ρv2)S, where CD is the drag coefficient, ρ is the air density, v
A long fly ball strikes the wall at point A (where e1= 0.5) and then hits the ground at B (where e2 = 0.3). The outfielder likes to catch the ball when it is 4ft above the ground and 2ft in
The system is released from rest while in the position shown with the torsional spring undeflected. The rod has negligible mass, and all friction is negligible. Determine (a) The value of θ˙
The cylinder of the previous problem is now replaced by a linear spring of constant k as shown. The system is released from rest in the position shown with the torsional spring undeflected but with
The bowl-shaped device rotates about a vertical axis with a constant angular velocity ω = 6 rad/s. The value of r is 0.2 m. Determine the range of the position angle θ for which a stationary value
If the vertical frame starts from rest with a constant acceleration a and the smooth sliding collar A is initially at rest in the bottom position θ = 0, plot θ˙ as a function of θ and find the
The tennis player practices by hitting the ball against the wall at A. The ball bounces off the court surface at B and then up to its maximum height at C. For the conditions shown in the figure, plot
A particle of mass m is introduced with zero velocity at r = 0 when θ = 0. It slides outward through the smooth hollow tube, which is driven at the constant angular velocity ω0 about a horizontal
The elements of a device designed to measure the coefficient of restitution of bat–baseball collisions are repeated here from Prob. 3/265. The 1-lb “bat” A is a length of wood or aluminum which
For the conditions stated in the previous problem, determine the time t at which the velocity of the block is a maximum.
The system of three particles has the indicated particle masses, velocities, and external forces. Determine r̅, r̅̇, r̅̈, T, HO, and H˙ O for this two-dimensional system. y 2m | 20 4m -F
The system of three particles has the indicated particle masses, velocities, and external forces. Determine r̅, r̅̇, r̅̈ , T, HO, and H˙ O for this three-dimensional system. 3F 3m 2v 1.56 2.56
The system consists of the two smooth spheres, each weighing 3 lb and connected by a light spring, and the two bars of negligible weight hinged freely at their ends and hanging in the vertical plane.
The two small spheres, each of mass m, are rigidly connected by a rod of negligible mass and are released from rest in the position shown and slide down the smooth circular guide in the vertical
The angular momentum of a system of six particles about a fixed point O at time t = 4 s is H4 = 3.65i + 4.27j − 5.36k kg∙m2/s. At time t = 4.1 s, the angular momentum is H4.1 = 3.67i + 4.30j −
The monkeys of Prob. 4 /9 are now climbing along the heavy rope wall suspended from the uniform beam. If monkeys A, B, and C have velocities of 5, 3, and 2 ft/sec, and accelerations of 1.5, 0.5, and
The two spheres, each of mass m, are connected by the spring and hinged bars of negligible mass. The spheres are free to slide in the smooth guide up the incline θ. Determine the acceleration aC of
Each of the five connected particles has a mass of 0.5 kg, and G is the mass center of the system. At a certain instant the angular velocity of the body is ω = 2 rad/s and the linear velocity of G
Calculate the acceleration of the center of mass of the system of the four 10-kg cylinders. Neglect friction and the mass of the pulleys and cables. 500 N 250 N 10 10 kg kg 10 kg 10 kg
The four systems slide on a smooth horizontal surface and have the same mass m. The configurations of mass in the two pairs are identical. What can be said about the acceleration of the mass center
Calculate the vertical acceleration of the system mass center and the individual vertical accelerations of spheres 1 and 2 for the cases (a) α = β and (b) α ≠ β. Each sphere has a mass of 2 kg,
A centrifuge consists of four cylindrical containers, each of mass m, at a radial distance r from the rotation axis. Determine the time t required to bring the centrifuge to an angular velocity ω
The two small spheres, each of mass m, and their connecting rod of negligible mass are rotating about their mass center G with an angular velocity ω. At the same instant the mass center has a
The three small spheres are welded to the light rigid frame which is rotating in a horizontal plane about a vertical axis through O with an angular velocity θ˙ = 20 rad/s. If a couple MO = 30 N∙m
The 300-kg and 400-kg mine cars are rolling in opposite directions along the horizontal track with the respective speeds of 0.6 m/s and 0.3 m/s. Upon impact the cars become coupled together. Just
Billiard ball A is moving in the y-direction with a velocity of 2 m/s when it strikes ball B of identical size and mass initially at rest. Following the impact, the balls are observed to move in the
The woman A, the captain B, and the sailor C weigh 120, 180, and 160 lb, respectively, and are sitting in the 300-lb skiff, which is gliding through the water with a speed of 1 knot. If the three
The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. The man and woman begin
The three freight cars are rolling along the horizontal track with the velocities shown. After the impacts occur, the three cars become coupled together and move with a common velocity v. The weights
Two steel balls, each of mass m, are welded to a light rod of length L and negligible mass and are initially at rest on a smooth horizontal surface. A horizontal force of magnitude F is suddenly
The three small steel balls, each of mass 2.75 kg, are connected by the hinged links of negligible mass and equal length. They are released from rest in the positions shown and slide down the
Each of the bars A and B has a mass of 10 kg and slides in its horizontal guideway with negligible friction. Motion is controlled by the lever of negligible mass connected to the bars as shown.
The carriage of mass 2m is free to roll along the horizontal rails and carries the two spheres, each of mass m, mounted on rods of length l and negligible mass. The shaft to which the rods are
The small car, which has a mass of 20 kg, rolls freely on the horizontal track and carries the 5-kg sphere mounted on the light rotating rod with r = 0.4 m. A geared motor drive maintains a constant
The cars of a roller-coaster ride have a speed of 30 km/h as they pass over the top of the circular track. Neglect any friction and calculate their speed v when they reach the horizontal bottom
The 3-kg block A is released from rest in the 60° position shown and subsequently strikes the 1-kg cart B. If the coefficient of restitution for the collision is e = 0.7, determine the maximum
An automobile accident occurs as follows: The driver of a full-size car (vehicle A, 4000 lb) is traveling on a dry, level road and approaches a stationary compact car (vehicle B, 2000 lb). Just 50
The member OA rotates about a horizontal axis through O with a constant counterclockwise angular velocity ω = 3 rad /sec. As it passes the position θ = 0, a small block of mass m is placed on it at
The 2-lb piece of putty is dropped 6 ft onto the 18-lb block initially at rest on the two springs, each with a stiffness k = 3 lb/in. Calculate the additional deflection δ of the springs due to the
An electromagnetic catapult system is being designed to replace a steam-driven system on an aircraft carrier. The requirements include accelerating a 12 000-kg aircraft from rest to a speed of 70 m/s
The 200-kg glider B is being towed by airplane A, which is flying horizontally with a constant speed of 220 km / h. The tow cable has a length r = 60 m and may be assumed to form a straight line. The
For a given value of the force P, determine the steady-state spring compression δ, which is measured relative to the unstretched length of the spring of modulus k. The mass of the cart is M and that
The pickup truck is used to hoist the 40-kg bale of hay as shown. If the truck has reached a constant velocity v = 5 m/s when x = 12 m, compute the corresponding tension T in the rope. 16 m
A ball is thrown from point O with a velocity of 30 ft/sec at a 60° angle with the horizontal and bounces on the inclined plane at A. If the coefficient of restitution is 0.6, calculate the
The figure shows a centrifugal clutch consisting in part of a rotating spider A which carries four plungers B. As the spider is made to rotate about its center with a speed ω, the plungers move
The 180-lb exerciser is beginning to execute a bicep curl. When in the position shown with his right elbow fixed, he causes the 20-lb cylinder to accelerate upward at the rate g/4. Neglect the
Six identical spheres are arranged as shown in the figure. The two spheres at the left end are released from the displaced positions and strike sphere 3 with speed v1. Assuming that the common
The small slider has a speed vA = 15 ft/sec as it passes point A. Neglecting friction, determine its speed as it passes point B. 3' 15 ft/sec A
The spring of stiffness k is compressed and suddenly released, sending the particle of mass m sliding along the track. Determine the minimum spring compression δ for which the particle will not lose
At a steady speed of 200 mi/hr along a level track, the racecar is subjected to an aerodynamic force of 900 lb and an overall rolling resistance of 200 lb. If the drivetrain efficiency is e = 0.90,
The small 2-kg carriage is moving freely along the horizontal with a speed of 4 m/s at time t = 0. A force applied to the carriage in the direction opposite to motion produces two impulse
The simple 2-kg pendulum is released from rest in the horizontal position. As it reaches the bottom position, the cord wraps around the smooth fixed pin at B and continues in the smaller arc in the
A 30-g tire-balance weight is attached to a vertical surface of the wheel rim by means of an adhesive backing. The tire–wheel unit is then given a final test on the tire-balance machine. If the
A particle of mass m is attached to the end of the light rigid rod of length L, and the assembly rotates freely about a horizontal axis through the pivot O. The particle is given an initial speed v0
The block of weight W is given an initial velocity v1 = 20 ft/sec up the 20° incline at point A. Calculate the velocity v2 with which the block passes A as it slides back down. U2 V1 = 20 ft/sec W
The figure represents the space shuttle S, which is (a) In a circular orbit about the earth (b) In an elliptical orbit where P is its perigee position. The exploded views on the right
When a particle is dropped from rest relative to the surface of the earth at a latitude , the initial apparent acceleration is the relative acceleration due to gravity grel. The absolute acceleration
The small slider A moves with negligible friction down the tapered block, which moves to the right with constant speed v = v0. Use the principle of work-energy to determine the magnitude vA of the
A ball is released from rest relative to the elevator at a distance h1 above the floor. The speed of the elevator at the time of ball release is v0. Determine the bounce height h2 of the
A boy of mass m is standing initially at rest relative to the moving walkway inclined at the angle θ and moving with a constant speed u. He decides to accelerate his progress and starts to walk from
A simple pendulum is placed on an elevator, which accelerates upward as shown. If the pendulum is displaced an amount θ0 and released from rest relative to the elevator, find the tension T0 in the
The ball A of mass 10 kg is attached to the light rod of length l = 0.8 m. The mass of the carriage alone is 250 kg, and it moves with an acceleration aO as shown. If θ˙ = 3 rad/s when θ = 90°,
The slider A has a mass of 2 kg and moves with negligible friction in the 30° slot in the vertical sliding plate. What horizontal acceleration a0 should be given to the plate so that the
The block of mass m is attached to the frame by the spring of stiffness k and moves horizontally with negligible friction within the frame. The frame and block are initially at rest with x = x0, the
A boy of mass m is standing initially at rest relative to the moving walkway, which has a constant horizontal speed u. He decides to accelerate his progress and starts to walk from point A with a
The coefficients of friction between the flatbed of the truck and crate are μs = 0.80 and μk = 0.70. The coefficient of kinetic friction between the truck tires and the road surface is 0.90. If the
The launch catapult of the aircraft carrier gives the 7-Mg jet airplane a constant acceleration and launches the airplane in a distance of 100 m measured along the angled takeoff ramp. The carrier is
The 4000-lb van is driven from position A to position B on the barge, which is towed at a constant speed v0 = 10 mi/hr. The van starts from rest relative to the barge at A, accelerates to v = 15
The aircraft carrier is moving at a constant speed and launches a jet plane with a mass of 3 Mg in a distance of 75 m along the deck by means of a steam-driven catapult. If the plane leaves the deck
The cart with attached x-y axes moves with an absolute speed v = 2 m/s to the right. Simultaneously, the light arm of length l = 0.5 m rotates about point B of the cart with angular velocity θ˙ = 2
If the spring of constant k is compressed a distance δ as indicated, calculate the acceleration arel of the block of mass m1 relative to the frame of mass m2 upon release of the spring. The system
The flatbed truck is traveling at the constant speed of 60 km/h up the 15-percent grade when the 100-kg crate which it carries is given a shove which imparts to it an initial relative velocity x˙ =
The satellite has a velocity at B of 3200 m/s in the direction indicated. Determine the angle β which locates the point C of impact with the earth. 5R R 2R B UB
A spacecraft in an elliptical orbit has the position and velocity indicated in the figure at a certain instant. Determine the semimajor axis length a of the orbit and find the acute angle α between
At the instant represented in the figure, a small experimental satellite A is ejected from the shuttle orbiter with a velocity vr = 100 m /s relative to the shuttle, directed toward the center of the
A space vehicle moving in a circular orbit of radius r1 transfers to a larger circular orbit of radius r2 by means of an elliptical path between A and B. (This transfer path is known as the Hohmann
In 1995 a spacecraft called the Solar and Helio-spheric Observatory (SOHO) was placed into a circular orbit about the sun and inside that of the earth as shown. Determine the distance h so that the
Sometime after launch from the earth, a spacecraft S is in the orbital path of the earth at some distance from the earth at position P. What velocity boost Δv at P is required so that the spacecraft
A spacecraft moving in a west-to-east equatorial orbit is observed by a tracking station located on the equator. If the spacecraft has a perigee altitude H = 150 km and velocity v when directly over

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