These are Heat engine questions:

1. what do you expect to happen to the pressure and volume of the closed system of air that has a 200g mass on top of it when you heat up the air inside the system? explain you're reasoning.

2. what do you expect to happen to the pressure and volume of the closed system of air that is still heated as you remove the 200g Masson top of the piston? Explain you're reasoning.

3. do you expect a closed system air to return to the original pressure and volume when the heat is removed? explain your reasoning.

One kg mole of an ideal gas is compressed isothermally at 127°C from 1 atm to 10 atm in a piston-and-cylinder arrangement. Calculate the entropy change of the gas, the entropy change of the surroundings, and the total energy change resulting from the process, if: (a) the process is mechanically reversible and the surroundings consist of a heat reservoir at 127°C. (b) the process is mechanically reversible and the surroundings consist of a heat reservoir at 27°C. (c) the process is mechanically irreversible, requiring 20% more work than the mechanically reversible compression, and the surroundings consist of a heat reservoir at 27°C.

(a)Air, which can be assumed to behave as an ideal gas, undergoes a process from 150kPa and 400K to 600kPa and 500K within a piston cylinder. Can this process occur adiabatically? (Think about what the limitations on ???? are to answer this question). (b)Now consider air which is compressed in an air compressor adiabatically from 150kPa and 400K to 1000K and 600kPa. It enters the air compressor with a mass flow rate of 1kg/s. Determine the rate of entropy produced during the process in ??j/(s*k)

please answer both questions

the ones that are posted are wrong

1) A four-stroke diesel engine has a piston diameter of 16.5 cm and a stroke of 27 cm. The compression ratio is 14.3, the cut-off 4.23% of the stroke and the mean effective pressure 4.12 bar. The engine speed is 264 rev/min and the fuel consumption is 1.076 kg of oil per hour, having a calorific value of 39150 kJ/kg. Calculate the relative efficiency of the engine 2). A diesel engine has a brake thermal efficiency of 30%. If the calorific value of fuel used in 10000 kcal kg, calculate the brake specific fuel consumption

Consider a light, single-engine, propeller-driven, private airplane, approximately modeled after the Cessna T-41A. The characteristics of the airplane are as follows: wingspan = 35.8 ft, wing area = 174 ft², normal gross weight = 2950 lb, fuel capacity = 65 gal of aviation gasoline, the parasite drag coefficient C_D,0 = 0.025, Oswald efficiency factor = 0.8 and propeller efficiency = 0.8. The power plant comprises one-piston engine of 230 hp at sea level. Calculate the maximum velocity of the airplane at sea level.

A cylinder with a piston contains 0.300 mol of oxygen at 2.50×105 Pa and 360 K . The oxygen may be treated as an ideal gas. The gas first expands isobarically to twice its original volume. It is then compressed isothermally back to its original volume, and finally it is cooled isochorically to its original pressure.

a. Find the heat added to the gas during the initial expansion

b. Find internal-energy change of the gas during the initial expansion.

c. Find the heat added during the final cooling;

d. Find the internal-energy change during the isothermal compression.

1. Assume that 100 births are randomly selected and 51 of the births are girls. Use subjective judgment to describe the number of girls as significantly​ high, significantly​ low, or neither significantly low nor significantly high.
2. In a survey of consumers aged 12 and​ older, respondents were asked how many cell phones were in use by the household. ​ (No two respondents were from the same​ household.) Among the​ respondents, 207 answered​ "none," 298 said​ "one," 365 said​ "two," 138 said​ "three," and 104 responded with four or more. A survey respondent is selected at random. Find the probability that​ his/her household has four or more cell phones in use. Is it unlikely for a household to have four or more cell phones in​ use? Consider an event to be unlikely if its probability is less than or equal to 0.05.

5. The table below displays results from experiments with polygraph instruments. Find the positive predictive value for the test. That​is, find the probability that the subject​ lied, given that the test yields a positive result.

Did the Subject Actually​ Lie?

No​ (Did Not​ Lie) Yes​ (Lied) Positive test results 11, 45 Negative test results 33, 12

The probability is?

​(Round to three decimal places as​ needed.)

8. Assume that when adults with smartphones are randomly​ selected, 58​% use them in meetings or classes. If 9 adult smartphone users are randomly​ selected, find the probability that fewer than 4 of them use their smartphones in meetings or classes.

(Round to four decimal places as​ needed.)

9. Based on a​ poll, among adults who regret getting​ tattoos,

21​% say that they were too young when they got their tattoos. Assume that six adults who regret getting tattoos are randomly​ selected and find the indicated probability. Complete parts​ (a) through​ (d) below.

1. Find the probability that none of the selected adults say that they were too young to get tattoos.
2. Find the probability that exactly one of the selected adults says that he or she was too young to get tattoos.
3. Find the probability that the number of selected adults saying they were too young is 0 or 1.
4. If we randomly select 6 adults, is 1 significantly low number who say that they were too young to get​ tattoos?

Start from number 5

The following table shows the number of marriages in a given State broke down by age groups and gender:

                                                            AGE at the time of the marriage

Use the table to answer questions (1) to (11).

1. Use the information in the table to fill in the blanks in the row and column totals.

2. How many people (male and female) got married in the State?

3. If a person that was married was randomly chosen, what is the probability that the person was a female less than 20 years old? Express your answer as a percent rounded to the nearest whole percent.

4. If a person that was married was randomly chosen, what is the probability that the person was a male less than 20 years old? Express your answer as a percent rounded to the nearest whole percent.
5. If a person that was married was randomly chosen, what is the probability that the person was between the ages of 25 and 34? Express your answer as a percent rounded to the nearest whole percent.
6. Of the people over the age of 45 who got married, what percentage was female? What percentage was male? Express your answer as a percent rounded to the nearest whole percent.
7. Given that a person married was less than twenty years old, what is the probability that the person was male?
8. Given that a person married was female, what is the probability that the person was between the ages of 35 and 44?
9. If a person that was married was randomly chosen, what is the probability that the person was over the age of 45 or female?
10. If a person that was married was randomly chosen, what is the probability that the person is male and between the ages of 25 and 34
11. Describe two events, A and B, which are mutually exclusive for the number of marriages in the State. Calculate the probability of each event, and the probability of A or B occurring.

PART 2:

There are data that give the relative frequency probabilities of various types of accidents (such as being killed by lightning, by a shark bite, or by falling airplane debris).

Choose two types of fatal accidents and research the relative frequency probabilities of each. Compare and discuss your findings. Were you surprised by the results? Why or why not? Your answers should be a minimum of three complete sentences. Be sure to include your references.

An insurance company has found that 8% of its claims are for damages resulting from burglaries. What is the probability that a random sample of 20 claims will contain 5 or fewer that are for burglary damages?

a. What is the probability that a sample of 20 claims will contain more than 5 claims for damages resulting from burglaries?

b. What is the expected number of claims resulting from burglaries?

Three fair coins are flipped independently. Let X be the number of heads among the three coins.

(1) Write down all possible values that X can take.

(2) Construct the probability mass function of X.

(3) What is the probability that we observe two or more heads. (i.e., P(X ≥ 2))

(4) Compute E[X] and Var(X).