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An igniter is needed for a rocket motor similar to one shown in Fig. 12-1. Igniters have been designed by various oversimplified design rules such as Fig. 14-3. The motor has an initial internal grain cavity volume of 0.055 m3 and an initial burning surface of 0.72 m2. The proposed igniter propellant has these characteristics: combustion temperature 2500 K and an energy release of about 40 J/kg-sec. Calculate the minimum required igniter propellant mass
(a) if the cavity has to be pressurized to about 2 atm (ignore heat losses);
(b) if only 6% of the igniter gas energy is absorbed at the burning surface, and it requires about 20 cal/cm2-sec to ignite in about 0.13 sec.
The standard enthalpy of neutralization of sodium hydroxide solution by hydrochloric acid.
Apply the Welch variant of the Lempel-Ziv encoding procedure to the binary sequence 0000000000000000. Demonstrate the first 5 steps of the decoding process.
If oxygen is fed at 20 °C and 1 atm, what is the volume flow rate of oxygen to the furnace?
In the storage of flammable liquids, if the composition of the vapor-air mixture above the liquid surface falls within the flammability limits, a floating roof tank would need to used or the tank blanketed with inert gas. Check if the vapor compos..
The cost of the stoichiometric amount of feed required to make the product is 3 $/kg. Propose preliminary targets for cost of production and yields.
Use the Gibbs phase rule to determine how many degrees of freedom exist for the system at equilibrium. State the meaning of your result in your own words.
At the same time, 45 J of heat is transferred from the surroundings to the system. Against what pressure was the piston working?
After 50 ml of the same enzyme solution in part (a) is mixed with 50 ml of 8x10-4 M substrate and 25 ml of a test sample, the initial rate observed is 18 µM/min. What is the pesticide concentration in the test sample assuming no other inhibitors o..
Compute the worst voltage regulation and the power factor at which it occurs, when the transformer is delivering rated output at rated secondary terminal voltage of 240 V. Sketch the corresponding phasor diagram.
Handling operations for solid/powder substances are often a source of dust generation and are a source of exposure to hazardous substances in industries. Describe in details the measures that can be taken to prevent exposure during the following s..
For the design of internal-pressure cylindrical vessels, the API-ASME Code for Unified Pressure Vessels recommends the following equations for determining the minimum wall thickness when extreme operating pressures are not involved:
What is the main sequence diagram? How do results from the Westheimer model in Section 12.4 compare with the main sequence diagram?
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