Master Engineering with Fun Quizzes & Brain Teasers!

Apply the particle under a net force model to the block in the horizontal direction:1) Fx = F cos - fk - T = m2ax = m2aApply the particle in equilibrium model to the block in the vertical direction:2) Fy = n + F sin - m2g = 0Apply the particle under a net force model to the ball in the vertical direction:3) Fy = T - m1g = m1ay = m1aSolve Equation (2) for n:n = m2g - F sin Substitute n into fk = ?kn from the above equation:4) fk = k (m2g - Fsin )Substitute Equation (4) and the value of T from Equation (3) into Equation (1):F cos - k(m2g - Fsin ) - m1(a + g) = m2aSolve for a in terms of k, m1, m2, g, and ?:
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5.Germanium forms a substitutional solid solution with silicon. Compute the number of germanium atoms per cubic centimeter for a germanium-silicon alloy that contains 15 wt% Ge and 85 wt% Si. The densities of pure germanium and silicon are 5.32 and 2.33 g/cm3, respectively. Atomic weight of Ge is 72.64 g/mol
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Given the circuit at the right in which the following values are used: R1 = 20 k, R2 = 12 k, C = 10 F, and = 25 V. You close the switch at t = 0. Find (a) the current in R1 and R2 at t=0, (b) the voltage across R1 after a long time. (Careful with this one.)
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What kind of materials is nylon
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A horizontal turbine takes in steam with an enthalpy of h = 2.80 MJ/kg at 45 m/s. A steam-water mixture exits the turbine with an enthalpy of h = 1.55 MJ/kg at 20 m/s. If the heat loss to the surroundings from the turbine is 300 J/s, determine the power the fluid supplies to the turbine. The mass flow rate is 0.85 kg/s.
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A steel cylindrical pressure vessel has an inside diameter of 2m and a wall thickness of 2cm. If the steel has a yield stress Y= 425 MPa, calculate the tank pressure that would just cause yielding of the tank material:
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A solid cylindrical part with dimensions of 25 mm in diameter and 15 mm in height is to be produced from fine loose copper powder and is to have a tensile strength of 175 MPa. Assuming that the sintered density is equal to the compacting density, determine a) the compacting pressure, b) the press force and c) the initial volume of powder needed.
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You want to plate a steel part having a surface area of 160 with a 0.002--thick layer of lead. The atomic mass of lead is 207.19 . The density of lead is 11.36 . How many atoms of lead are required
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The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 50 N m . You plan to tighten the plugs by pulling on the end of a 23-cm-long wrench. Because of the cramped space under the hood, you'll need to pull at an angle of 125 with respect to the wrench shaft. With what force must you pull? F=?
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The velocity field of a flow is given by V = 2x2 ti +[4y(t - 1) + 2x2 t]j m/s, where x and y are in meters and t is in seconds. For fluid particles on the x-axis, determine the speed and direction of flow
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Poles are values of Laplace transform variable, s, that make denominator of transfer function zero. Zeros are values of Laplace transform variable, s, that make numerator of transfer function zero. The gain, K, is constant that multiplies entire numerator and denominator. MATLAB function, tf2zp, obtains transfer function zeros, poles, and gain given its numerator and denominator. For example, [z,p,K] = tf2zp(num,den) given a numerator, 4s2 + 165 + 12 and denominator s4 + 1253 +44s2 + 485, determine the zeros, poles, and gain of the transfer function using the tf2zp function. Poles and zeros should be ordered from largest to smallest to match the order given below. Larger number, meaning -2 > -4, NOT largest magnitude.zero(1) zero(2) pole(1) pole(2) pole(3) pole(4) gain
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Suppose you have a circuit you are working with, but you recognize that there is a really strong LaTeX: 60\text{Hz}60 Hz hum due to the AC power being provided to your system. You wish to reduce the effect of this humming but not any other frequency content in the signal. Which type of filter should you use to remove it
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Eight switches are connected to PORTB and eight LEDs are connected to PORTA. We would like to monitor the first two least significant bits of PORTB (use masking technique). Whenever both of these bits are set, switch all LEDs of Port A on for one second. Assume that the name of the delay subroutine is DELAY. You do not need to write the code for the delay procedure.
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BE-40 What is a characteristic of a catamaran hull?Planes at low speedTends to pitch in wavesA stable rideOnly recommended on calm inland waters
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When the transportation of natural gas in a pipeline is not feasible for economic reasons, it is first liquefied using nonconventional refrigeration techniques and then transported in super-insulated tanks. In a natural gas liquefaction plant, the liquefied natural gas (LNG) enters a cryogenic turbine at 30 bar and 160C at a rate of 20 kg/s and leaves at 3 bar. If 120 kW power is produced by the turbine, determine the efficiency of the turbine. Take the density of LNG to be 423.8 kg/m3.
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An Ideal gas is being heated in a circular duct as while flowing over an electric heater of 130 kW. The diameter of duct is 500 mm. The gas enters the heating section of the duct at 100 kPa and 27 deg C with a volume flow rate of 15 m3/s. If heat is lost from the gas in the duct to the surroundings at a rate of 80 kW, Calculate the exit temperature of the gas in deg C. (Assume constant pressure, ideal gas, negligible change in kinetic and potential energies and constant specific heat; Cp =1000 J/kg K; R = 500 J/kg K)
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To determine the viscosity of a liquid of specific gravity 0.95, you fill to a depth of 12 cm a large container that drains through a 30 cm long vertical tube attached to the bottom. The tube diameter is 2 mm, and the rate of draining is found to be 1.9 cm3 /s. What is the fluid viscosity (assume laminar flow)
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An Ideal gas is being heated in a circular duct as while flowing over an electric heater of 130 kW. The diameter of duct is 500 mm. The gas enters the heating section of the duct at 100 kPa and 27 deg C with a volume flow rate of 15 m3/s. If heat is lost from the gas in the duct to the surroundings at a rate of 80 kW, Calculate the exit temperature of the gas in deg C. (Assume constant pressure, ideal gas, negligible change in kinetic and potential energies and constant specific heat; Cp =1000 J/kg K; R = 500 J/kg K
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a surveyor is trying to find the height of a hill . he/she takes a sight on the top of the hill and find that the angle of elevation is 40. he/she move a distance of 150 metres on level ground directly away from the hill and take a second sight. from this point the angl.e of elevation is 22. find the height of the hill
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Decompose the signal (1+0.1 cos5t) cos100t into a linear combination of sinusoidal functions, and find the amplitude, frequency, and phase of each component. Hint: use the identity for cosacosb.
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2. Wood smoke can be a source of carbon monoxide. Wood produces about 200 g of CO per kg of wood burned. Suppose you make a very large bonfire by burning 400 kg of wood per hour. Assume it is a clear night over rough terrain with the wind blowing at 2.4 m/s (as measured at 10 m). Assume the effective stack height is 6 m. A. What is the rate of CO production (Q) in g/s
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The gradual and uniform cooling of glass that has been heated in order to relieve random internal stresses is... Group of answer choices annealing tempering quenching heat treating
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An Ideal gas is being heated in a circular duct as while flowing over an electric heater of 130 kW. The diameter of duct is 500 mm. The gas enters the heating section of the duct at 100 kPa and 27 deg C with a volume flow rate of 15 m3/s. If heat is lost from the gas in the duct to the surroundings at a rate of 80 kW, Calculate the exit temperature of the gas in deg C. (Assume constant pressure, ideal gas, negligible change in kinetic and potential energies and constant specific heat; Cp =1000 J/kg K; R = 500 J/kg K)
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If the 1550-lb boom AB, the 190-lb cage BCD, and the 169-lb man have centers of gravity located at points G1, G2 and G3, respectively, determine the resultant moment produced by all the weights about point A.
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