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A new concrete mix is being designed to provide adequate compressive strength for concrete blocks. The specification for a particular application calls for the blocks to have a mean compressive strength greater than 1350 kPa. A sample of 100 blocks is produced and tested. Their mean compressive strength is 1356 kPa and their standard deviation is 70 kPa.
a.) What is the p-value
b.) Find the critical value of the test statistic
A water sample contains 118mg/L of bicarbonate ion, 19mg/L of carbonate ion, and has a pH of 9.5. What is the alkalinity of this water expressed as mg/L of CaCO3?
The thickness of each layer is determined by the "last" ID number. Four student numbers are used as the example - Circular and non-circular slip surfaces should be considered
determine diameter of 200 m section commercial steel pipe (darcy's friction factor f = 0.0115) that carries a flow of 0.24 m^3/s and allowable head loss ove the section is 3.5 m.
A telephone wire 5 mm in diameter is suspended between telephone poles spaced 50 m apart. If the wind velocity is 100 km/h and the air is at 2 degrees C, 1 atm, determine the horizontal force (in N) the wire exerts on the poles.
The solid compound shaft, made of three di¤erent materials, carries the two torques shown. (a) Calculate the maximum shear stress in each material. (b) Find the angle of rotation of the free end of the shaft.
Use the ideal gas law to estimate the mass of the air (in KG) contained in the room. State clearly what your approximate temperature , volume are. Molar mass of air is about 29.
A 1.5 meter deep vertical wall trench is to be cut in a soil whose unit weight is 17.36 kN/cubic meters, angle of internal friction is 25 degrees, and cohesion is 20.6 kN/square meters.
A 1: 1½ : 3 mix (by mass) has a water/cement ratio of 0.4 and a cement content of (400) kg/m3. The temperatures of the ingredients are as follows
An object which has a volume of 0.18 m^3 requires a force of 265 N to keep it immersed in water. If a force of 157 N is required to keep it immersed in another liquid, find the specific gravity of the liquid
The maximum gage pressure is known to be 8MPa in a spherical steel pressure vessel having a 250mm diameter and a 6mm wall thickness. Knowing that the ultimate stress in the steel used is (sigma u)= 400MPa, determine the factor of safety with respe..
The flow is designed using a rectangular coordinate system whose orgin is at the free surface midway between the walls. The x axis is normal to the walls, and the y axis points vertically downward.
you are studying a 3-km stretch of stream that is about 35 m wide. a gaging station onnbspthe stream provides you with
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