Mechanical Engineering

Engineering dynamics question: The motion of a particle is defined by the relation x = t^3 – 9t^2 + 24t – 8, where x and t are expressed in inches and seconds, respectively. Determine the time when the velocity is zero. (Round the final answer to the nearest whole number.)

Engineering dynamics question: The motion of a particle is defined by the relation x = t^3 – 9t^2 + 24t – 8, where x and t are expressed in inches and seconds, respectively. Determine the time when the velocity is zero. (Round the final answer to the nearest whole number.) The magnitudes of time when …

Engineering dynamics question: The motion of a particle is defined by the relation x = t^3 – 9t^2 + 24t – 8, where x and t are expressed in inches and seconds, respectively. Determine the time when the velocity is zero. (Round the final answer to the nearest whole number.) Read More »

The boy of mass 40 kg is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components r = 1.5 m, θ = (0.7t) rad, and z = (-0.5t) m, where t is in seconds. Determine the components of force Fr, Fθ, and Fz which the slide exerts on him at the instant t = 2 s. Neglect the size of the boy.

The boy of mass 40 kg is sliding down the spiral slideat a constant speed such that his position, measuredfrom the top of the chute, has components r = 1.5 m,θ = (0.7t) rad, and z = (-0.5t) m, where t is in seconds.Determine the components of force Fr, Fθ, and Fzwhich the slide exerts …

The boy of mass 40 kg is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components r = 1.5 m, θ = (0.7t) rad, and z = (-0.5t) m, where t is in seconds. Determine the components of force Fr, Fθ, and Fz which the slide exerts on him at the instant t = 2 s. Neglect the size of the boy. Read More »

Q3: Write whether each of the following is true (T) or false (F): (25 marks) 1- Heat engine uses kinetic energy to produce mechanical work. 2- In a two stroke engine, the working cycle is completed in two revolutions of the crankshaft. 3- The transfer port is present in four-stroke engine. 4- The effect of dissociation is higher than that of change of specific heat. 2/3 5- The value of specific heat ratio y for a real gas decreases with increase in temperature. 6- The brake power is the net power available at the piston of the engine. 7- The Stirling cycle consists of two isothermal and two constant pressure processes.

EXPERT ANSWER Solution with discussion : 1. False statement! Heat engine is a device which uses the chemical energy of fuel to with mechanical work output. Like our bike and car engines. It takes chemical energy of petrol or oils to produce mechanical work. 2. False statement! In two stroke engine cycle is completed in …

Q3: Write whether each of the following is true (T) or false (F): (25 marks) 1- Heat engine uses kinetic energy to produce mechanical work. 2- In a two stroke engine, the working cycle is completed in two revolutions of the crankshaft. 3- The transfer port is present in four-stroke engine. 4- The effect of dissociation is higher than that of change of specific heat. 2/3 5- The value of specific heat ratio y for a real gas decreases with increase in temperature. 6- The brake power is the net power available at the piston of the engine. 7- The Stirling cycle consists of two isothermal and two constant pressure processes. Read More »

Question: Problem # 3 The acceleration of a particle is defined by the relatio

Problem # 3 The acceleration of a particle is defined by the relation a =-k/r. It has been experimentally determined that v.. 15 fds when х=0.6ft and that v=9 ft/s when x=1.2 ft. Determine (a) the velocity of the particle when x-1.5 ft, (b) the position of the particle at which its velocity is zero. …

Question: Problem # 3 The acceleration of a particle is defined by the relatio Read More »