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If the coefficient of sratic friction between the wheels at B and the ground is 0.5 determine if it is possible to pull at p=1200 lb without causing the wheels at B to slip or the front wheels of A
two sedimentation tanks operate in parallel. The combined flow to the two tanks is .1 m^3/s. the depth of each tank is 2 m and each has a detention time of 4 h.
if the settling velocity of a particle is 2.8 mm/s and the overflow rate of an upflow clarifier is .56 cm/s what percent of the particles are retained in the clarifier
At a specified point on a highway, vehicles are known to arrive according to a poisson process. Vehicles are counted in 20 second intervals, and vehicle counts are taken in 120 of these time interva
number 9 compression bars in a column are to be lap spliced. there is no excess steel, and the bars are enclosed by a spiral of 3/8 inch diameter wire having a pitch of 3 inch.
Water enters a two-armed lawn sprinkler along the vertical axis (normal to the page) at a rate of 80 L/s and leaves the sprinkler nozzles as 1.5-cm diameter jets at an angle of from the tangential d
The true bearing of the line a-b is S 88*50' W, the magnetic bearing of the line d-c is N 89*45' E. What is the magnetic declination
Estimate the time when the temperature at the geometric center of a 6 cm diameter apple held in 2`C water stream reaches 3oC. The initial uniform temperature of the apple is 15`C.
A 50-kg iron block at 80C os dropped into an insulated tank that contains 0.5m^3 of liquid water at 25C. determine the temperature when thermal equilibrium is reached.
A NCSU student turned on his/her 150 W fan inside his/her room, 4m * 6m * 6m, before going to class in the morning of a summer day, excepting to find his/her room cooler when he/she returns at night
The force F is acting on the boom ABC at C points in the direction of the unit vector 0.7071i-0.7071j and its magnitude is 10kN. The boom is supported by a ball and socket at A and cables BD and BE.
The ball is kicked so that it has a velocity of 0.5 m/s and the cord is pulled in at a rate of 0.2 m/s. Neglect friction so that the only important force on the ball is the tension in the cord. Find
The block is released from rest when the spring is unstretched (at x=0). We wish to show that the ensuing motion of the block is simple harmonic. Call the initial configuration of the system that ex
How many centimeters of armor plating will a 150 gram 30 mm round penetrate. How far will a depleted uranium 30 mm round penetrate if its mass is 600 grams.
A truck is designed to measure concrete roughness. During a typical test the driver will bring the vehicle to a constant test velocity, v, and then suddenly lock the brakes bringing the vehicle to a
A barge-mounted, ocean thermal energy conversion (OTEC) power station is being tested off the island of Hawaii. The 50 kWturbogenerator runs on a closed ammonia cycle.
Consider a house that is heated and maintained at 20oC by a heat pump during the winter. What is the maximum COP for this pump if heat is extracted from the outdoor air at (a) 10oC, (b) -5oC, and (c
Consider a 2D triangular element with the three vertices at 1[1,1], 2[1,2] and 3[2,2]. the displacements at these t hree points are [0.1,0.1], [0.3,0.2] and [0.4, 0.3] mm for point 1,2,and 3 respect
Plot the distribution of vertical effective stress and porewater pressure with depth if the void ratio of the sand is 0.6 and the degree of saturation is 90%. Neglect pore air pressure
given data of water softened by excess lime treatment, sketch a meq/l, calculate the softening chemicals required in pounds per million gallons, and draw a bar graph for the softened water after re
The center of gravity G of the 20-in. club is located 12 in. from the knob. knowing that at the instant, G has a velocity of 4 ft/s upwards and the club has an angular velocity of 30 rad/s countercl
Two links AB and B, each 25 in. long are connected at B and guided by hydraulic cylinders attached at A and D. Knowing that D is stationary and that the velocity of A is 30 in./s to the ight
The rod has a uniform cross-section of 53mm2. The external load consists of point loads: two P1 of 3kN, two P2 of 1kN, and one P3 of 7kN. What is the normal stress at the fixed support
The 1.2-Mg mine car is being pulled by winch M mounted on the car. If the winch generates a constant power output of 30 kW, and the car starts from rest, determine the speed of the car when t = 5s.
An April 2009 survey of 2253 American adults conducted by the Pew Research Center's Internet & American Life Project revealed that 1262 of the respondents had at some point used wireless means f