Engineering, 30.11.2019 04:31 TierraNicole6865
Define a class named timespan. a timespan object stores a span of time in hours and minutes (for example, the time span between 8: 00am and 10: 30am is 2 hours, 30 minutes). each timespan object should have the following public methods: timespan(hours, minutes) constructs a timespan object storing the given time span of hours and minutes. gethours() returns the number of hours in this time span. getminutes() returns the number of minutes in this time span, between 0 and 59. add(hours, minutes) adds the given amount of time to the span. for example, (2 hours, 15 min) + (1 hour, 45 min) = (4 hours). assume that the parameters are valid: the hours are non-negative, and the minutes are between 0 and 59. add(timespan) adds the given amount of time (stored as a time span) to the current time span. gettotalhours() returns the total time in this time span as the real number of hours, such as 9.75 for (9 hours, 45 min). tostring() returns a string representation of the time span of hours and minutes, such as "28h46m". the minutes should always be reported as being in the range of 0 to 59. that means that you may have to "carry" 60 minutes into a full hour.
Answers: 1
Engineering, 03.07.2019 14:10
Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.
Answers: 3
Engineering, 03.07.2019 15:10
Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?
Answers: 3
Engineering, 04.07.2019 18:10
Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.
Answers: 3
Engineering, 04.07.2019 18:10
Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?
Answers: 3
Define a class named timespan. a timespan object stores a span of time in hours and minutes (for exa...
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