As discussed in the previous question, the second stage of the propulsion system is used to boost the spacecraft from Martian orbit into an interplanetary trajectory and return to Earth.

Knowing that the thrust generated by the second stage is 2620 N and the rocket exhaust velocity is 430 m/s; calculate the minimum amount of propellant needed to have a chance of returning to Earth. Assume that the thruster must be turned on for 2 minutes in order to reach the proper velocity.

Give your answer in kg.

Thank you for your time!

Design a class named Employee. The class should keep the following information in fields: • Employee name • Employee number in the format XXX–L, where each X is a digit within the range 0–9, and the L is a letter within the range A–M. • Hire date Write one or more constructors and the appropriate accessor and mutator methods for the class. Next, write a class named ProductionWorker that inherits from the Employee class. The ProductionWorker class should have fields to hold the following information: Shift (an integer) Hourly pay rate (a double) The workday is divided into two shifts: day and night. The shift field will be an integer value representing the shift that the employee works. The day shift is shift 1, and the night shift is shift 2. Write one or more constructors and the appropriate accessor and mutator methods for the class. Demonstrate the classes by writing a program that uses a ProductionWorker object. In a particular factory, a shift supervisor is a salaried employee who supervises a shift. In addition to a salary, the shift supervisor earns a yearly bonus when his or her shift meets production goals. Design a ShiftSupervisor class that inherits from the Employee class. The ShiftSupervisor class should have a field that holds the annual salary, and a field that holds the annual production bonus that a shift supervisor has earned. Write one or more constructors and the appropriate accessor and mutator methods for the class. In a particular factory, a team leader is an hourly paid production worker who leads a small team. In addition to hourly pay, team leaders earn a fixed monthly bonus. Team leaders are required to attend a minimum number of hours of training per year. Design a TeamLeader class that inherits from the ProductionWorker class. The TeamLeader class should have fields for the monthly bonus amount, the required number of training hours, and the number of training hours that the team leader has attended. Write one or more constructors and the appropriate accessor and mutator methods for the class. Demonstrate the classes by writing a program that uses a TeamLeader object and a ShiftSupervisor object, as well as an Employee object. Be sure that all methods defined are called.

Explain what you understand from 'Ohm's law'. In about 50 words, explain practical consequences of Ohm's law, with examples from real life, as needed.

Determine the pH of a solution when 22.7 mL of 0.028 M HNO3 is mixed with 19.6 mL of

A) 0.0120 M NaOH.
B) distilled water
C) 0.0080 M HCl
D) 0.144 M KOH

Case Scenario: A teenage baseball player gets hit in the head with a fast- hard ball. Paramedics rush him to the hospital. Upon arrival to the ED, you find he is disoriented, he has sporadic respiratory changes, and his pupils are dilated but respond to light. He can tell you his name but not what has happened. During the exam, he vacillates between being somnolent and hyper aroused. The doctor tells parents of the boy that their child has a focal brain injury. He has no prior health conditions.

1. Question: During an observation of their son, the doctor tells the parents that the staff will be evaluating to see if there is a secondary brain injury. Give signs and symptoms of a secondary brain injury and explain why these symptoms occur. You will need to defend your answer using specific facts, data.

2- a. What is the price of a European put option on a non-dividend-paying stock when the stock price is $69, the strike price is $70, the risk-free interest rate is 5% per annum, the historical volatility is 35% per annum, and the time to maturity is six months?

b. WITHOUT using the B-S-M formula, please calculate the call option price on the same stock with $70 strike price and a time to maturity of 6 months? Explain how and show the process. (Simply showing a number without explanation and process is not a valid answer.)

c. For the same put option, if the actual market trading price is $5, what is the implied volatility?

Problem 14.71 IP Standing Waves in the Human Ear The human ear canal is much like an organ pipe that is closed at one end (at the tympanic membrane or eardrum) and open at the other (Figure 1) . A typical ear canal has a length of about 2.4 cm.

Part A What are the fundamental frequency and wavelength of the ear canal? Express your answer using two significant figures. f1 =_______ Hz

Part B Express your answer using two significant figures. λ1 = _____cm

Part C Find the frequency and wavelength of the ear canal's third harmonic. (Recall that the third harmonic in this case is the standing wave with the second-lowest frequency.) Express your answer using two significant figures. f3 =_______ Hz

Part D Express your answer using two significant figures. λ3 =_____ cm

Part E Suppose a person has an ear canal that is shorter than 2.4 cm. Is the fundamental frequency of that person's ear canal greater than, less than, or the same as the value found in part A? Explain.

Balance the following equation for reactions occurring in acidic solution: MnO4__ + H2S Mn2+ + S

Two objects of different composition with same mass are painted black and are placed in the sun at the same time. After 10 minutes object B is hotter than object A . Which has the higher specific heat . Explain 2.) Gold has a density of 19.3g / cm cube . If a chain necklace has a mass of 605g and volume of 42.7 cm cube , is the chain pure gold? Show calculations and explain basic concept of density.

1.why is it that ammonia can solvate the electron given by Na? how does it do this.

2. why is it that Na is explosive with water but not in ethanol when in both solvents the product is hydrogen?

3. Why cant ethanol or whatever solvate the electron like ammonia does?

please give a detailed explanation.

As an electron moves in the direction of the electric field lines...

Answer: It is moving from high potential to low potential and gaining electric potential energy.

Can someone explain why the electron is gaining electric potential energy if it is moving from high to low potential energy?

Vitex, Inc. manufactures a popular consumer product and it has provided the following data excerpts from its standard cost system: Inputs (1) Standard Quantity or Hours (2) Standard Price or Rate Standard Cost (1) × (2) Direct materials 2.30 pounds $ 16.30 per pound $ 37.49 Direct labor 1.00 hours $ 15.30 per hour $ 15.30 Variable manufacturing overhead 1.00 hours $ 9.20 per hour $ 9.20 Total standard cost per unit $ 61.99 Total Variances Reported Standard Cost* Price or Rate Quantity or Efficiency Direct materials $ 637,330 $ 11,919 F $ 32,600 U Direct labor $ 260,100 $ 3,600 U $ 15,300 U Variable manufacturing overhead $ 156,400 $ 4,400 F $ ?† U *Applied to Work in Process during the period. The company's manufacturing overhead cost is applied to production on the basis of direct labor-hours. All of the materials purchased during the period were used in production. Work in process inventories are insignificant and can be ignored. Required: 1. How many units were produced last period? 2. How many pounds of direct material were purchased and used in production? 3. What was the actual cost per pound of material? (Round your answer to 2 decimal places.) 4. How many actual direct labor-hours were worked during the period? 5. What was the actual rate paid per direct labor-hour? (Round your answer to 2 decimal places.) 6. How much actual variable manufacturing overhead cost was incurred during the period?

hat is the relationship between diabetes, glucose in food, saliva, microvilli, blood transport of glucose, beta cells of pancreas, diabetes- elevated blood glucose, glomerulus, glucose in urine? Major emphasis on RELATIONSHIP

What is the ratio of the mass of fresh water produced to the mass of water in the incoming brine?Multi-stage flash distillation is used to desalinate seawater so it is fit for human consumption. A flash distillation tank is composed of small chambers (called \"stages\"), each at a lower pressure than the previous stage. Salt water enters the first chamber, some fresh water flash evaporates, condenses, and is removed from the distillation tank. The remaining salt water moves to the next chamber, some fresh water flash evaporates, condenses, and is removed from the distillation tank. The remaining salt water moves to the next chamber, and the process repeats until very salty water is expelled as waste. Brine that is 35,000 ppm salt is desalinated through a 5-stage flash distillation process. The pressure in the stages is such that 8.5% by mass of the water entering the stage evaporates and leaves as fresh water. If the desalination plant wants to produce 1200.0 gallons of drinking water per day, how many gallons of brine must the plant take in per day? The density of fresh water is 1.000 g/cm3. The density of brine is 1.025 g/cm3.

What mass of waste brine is expelled in one day?

What is the ratio of the mass of fresh water produced to the mass of water in the incoming brine?

The larger this ratio is, the more fresh water is produced for the given incoming water. If additional stages are added, each removing 8.5% of the available incoming water, so that the above ratio gets above 0.5, what are the total number of stages in the multi-stage flash distillation tank? (respond with a whole number)

The energy requirement of this type of desalination plant is 25.5 kW·h/m3 of fresh water. How much energy does the plant require to produce 1200.0 gallons of fresh water?