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A commuter's journey to work consists of driving her car to her local train station, taking a train to the city, and catching a bus to her place of work. If her car trip is delayed she misses the train and is late for work. If the train is delayed, she misses the bus and is late for work. If the bus is delayed she is late for work. The probability that her car journey is delayed is 0.05, the probability that the train is delayed is 0.1, and the probability that the bus is delayed is 0.07.
(a) What is the probability that she arrives at work on time?
(b) What is the probability that she is late for work?
(c) What is the probability that she is late for work because the bus is delayed?
Determine the apparent power and the reactive power drawn by the load.
Explain how heat is lost from a hot surface to the surrounding air - what is meant by the economic thickness of lagging?
(a) Describe the provisions of Occupational Safety and Health Act 2005 with regard to ‘Substances hazardous to health' (b) Describe four types of hazard which arise from the use of chemicals
In a process for the production of acrylic fibers by the emulsion polymerization of acrylonitrile, the unreacted monomer is recovered from water by distillation. Acrylonitrile forms an zoetrope with water and the overhead product from the column c..
What is the identity of the solid? Give the balanced equation of this species decaying by -particle production. Why is the solid a more potent a-particle producer?
The laboratory division of your company has sent you the following data for the system n-pentane (1) propionaldehyde (2) at 35 °C: The activity coefficients of the two components at infinite dilution are 4.0 and the saturation pressures of the pur..
Circle all answers that are correct; there can be 0 to 5 correct answers. Which of the statements below is true?
Make a rough estimate of the cost of steam per ton, produced from a packaged boiler. 10,000 kg per hour of steam are required at 15 bar. Natural gas will be used as the fuel, calorific value 39 MJ/m3 (roughly 1 MMBtu/1000 scf). Take the boiler eff..
Wet steam at 1 100 kPa expands at constant enthalpy (as in a throttling process) to 101.325 kPa, where its temperature is 378.15 K (105°C). What is the quality of the steam in its initial state?
A liquid mixture consisting of 100 kmol of 60 mol% benzene, 25 mol% toluene, and 15 mol% o-xylene is flashed at 1 atm and 100°C. (a) Compute the amounts of liquid and vapor products and their composition.
In a process to produce 1000 kgmol/h acetaldehyde, ethane is fed to the reactor at 1500 kgmol/h and the fractional conversion is 0.8. The product stream contains 2 mol% CO2. Calculate the molar composition of the product stream and the fractional sel..
A solution that contains nitromethane in acetonitrile is heated at constant pressure of 1 bar until the first bubble appears. If the temperature at this point is 85 °C, what is the composition of the original solution?
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