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A reaction known to release 1.78 kJ of heat takes place in a calorimeter containing 0.100L of solution and the temperature rose by 3.65 degrees C. The calorimeter was then rinsed out and emptied. To the empty calorimeter was placed a small piece of calcium carbonate and 0.100L of dilute HCl was poured over it (in the same calorimeter). The temperature of the calorimeter then rose by 3.57 degrees C. What is the heat, q, in kJ released by the reaction? Remember to include the correct sign in your answer. Please show work.
A two-axle truck being driven on a flat and straight section of a highway at a speed of 65 mph reaches a curved section of the highway with a grade of 5% and a radius of 1,500ft.
The probability that, for a 2-year period, the peak flow rate will equal or exceed the median value in the second year, but not in the first year?
At a local engineering firm, a supervisor thinks about buying a new copy machine for $700 but only wants to keep it for 3 years. Using the DDB find the book value of the machine at the end of 2 years.
Two objext A and B are moving along the same line. At the time t=0, B is 75ft ahead of A. The acceleration of A is 1.8ft/s^2 and the acceleration of B is -1.3ft/s^2. The velocity of A is 32ft/s and the velocity of B is 51ft/s.
What is the elongation of a rectangular bar (cross section 2 inch * 2 inch length 4 ft) When it is subjected to an axial load of 80,000 lbs. Assume the material of the bar has the following properties G = 7,700 KSI, V =0.30
How many mL of water will it take to get 10 pounds of dry aggregate to a moisture content of 5%. 1 kg=2.2 pounds
A 420 kW pump delivers gasoline at a rate of 1.28 m^3/s through a horizontal pipe. The average roughness height is 0.005 cm. The total length of the pipe is 46 m. Calculate the pipe diameter.
If the submarine operates at a depth of 75 meters (to the center of the side portals), what is the hydrostatic force on one of the side portals, in KPa?
If the time required to pay for parking is exponentially distributed with a mean of 15 seconds, find the average time in system.
During a BOD test, 2 mL of waste water having a DO of 0 was mixed with 298 mL of dilution water having a DO of 8.9 mg/L. After 5 days and 20 days, it was noted that the DO of the test bottle was 4.0 and 2.5 respectively
A small plot of land has measured dimesnions of 50 by 150 ft. the incertianity in the 50-ft is +/- 0.01 ft. Calculate the uncertianity heith which the 150-ft must be measred to ensure that the total uncertainty is not greater than 150%.
The velocity distribution for water (20 C) near a wall is given by u=a(y/b)^1/6 where a=10m/s, b=2mm, and y is the distance from the wall in mm. Determine the shear stress in the water at y=1mm. [viscosity of water at 20 C = 1.81 x 10^-5]
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