2. A sky diver jumps from a plane at an altitude of 20km, where the temperature...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
2. A sky diver jumps from a plane at an altitude of 20km, where the temperature is around -20 C. After an initial acceleration period (which you can ignore), they fall through the air at a constant speed of 195 km/h or 54 m/s (this is the terminal velocity you reach as a result of air friction). (a) If you assume a 'typical' person (75kg mass, surface area 1.8m, skin temperature 34C) without any special protective clothing, make a rough estimate of how much heat the sky diver loses (per unit time) as a result of the extreme air convection that they experience during their fall. (Please note that the relevant equation is technically only valid for velocities up to around 20m/s, but please ignore this limitation for the moment). (b) (c) If you assume a BMR of about 100W for this person, what is their net heat loss in free fall (in W)? If you assume that the sky diver will deploy their parachute at about 500m from ground, how much time do they spend in the free fall phase? Given their net heat loss from part b, by how much would their body temperature drop during this time, assuming the specific heat of the body to be 3,470 J/(kg.K)? Is this cause for concern, i.e. would you recommend special protective clothing? 2. A sky diver jumps from a plane at an altitude of 20km, where the temperature is around -20 C. After an initial acceleration period (which you can ignore), they fall through the air at a constant speed of 195 km/h or 54 m/s (this is the terminal velocity you reach as a result of air friction). (a) If you assume a 'typical' person (75kg mass, surface area 1.8m, skin temperature 34C) without any special protective clothing, make a rough estimate of how much heat the sky diver loses (per unit time) as a result of the extreme air convection that they experience during their fall. (Please note that the relevant equation is technically only valid for velocities up to around 20m/s, but please ignore this limitation for the moment). (b) (c) If you assume a BMR of about 100W for this person, what is their net heat loss in free fall (in W)? If you assume that the sky diver will deploy their parachute at about 500m from ground, how much time do they spend in the free fall phase? Given their net heat loss from part b, by how much would their body temperature drop during this time, assuming the specific heat of the body to be 3,470 J/(kg.K)? Is this cause for concern, i.e. would you recommend special protective clothing?
Expert Answer:
Answer rating: 100% (QA)
a To estimate the heat loss of the skydiver per unit time as a result of air convection we can use N... View the full answer
Related Book For
A First Course in Differential Equations with Modeling Applications
ISBN: 978-1305965720
11th edition
Authors: Dennis G. Zill
Posted Date:
Students also viewed these physics questions
-
Your answer is partially correct. Sheridan Company is considering a long-term investment project called ZIP. ZIP will require an investment of $126,000. It will have a useful life of 4 years and no...
-
A skydiver weighs 125 pounds, and her parachute and equipment combined weigh another 35 pounds. After exiting from a plane at an altitude of 15,000 feet, she waits 15 seconds and opens her parachute....
-
Planning is one of the most important management functions in any business. A front office managers first step in planning should involve determine the departments goals. Planning also includes...
-
Suppose that two stocks whose rates of return are given by the two-factor arbitrage pricing model r= a +31 +42 r2 = 02 +241 +2, where a, and a2 are constants. Furthermore, there is a risk-free asset...
-
Suppose that X is a separable metric space which satisfies the Bolzano-Weierstrass Property, that Y is a complete metric space, and that E is a bounded subset of X. Prove that a function f: E Y is...
-
In a Hall-effect experiment, a current of 3.0 A sent lengthwise through a conductor 1.0 cm wide, 4.0 cm long, and 10 pm thick produces a transverse (across the width) Hall potential difference of 10V...
-
Pension fund data are found in the annual report section entitled "Notes to Consolidated Financial Statements." For example, the 1991 IBM Annual Report indicated a present value of pension benefits...
-
1. What are some of the fraud opportunities within Green Grass? 2. What symptoms of fraud exist, and what symptoms should the owner look for if he believes fraud may be occurring? 3. What steps...
-
Solve for R 1 + R2 O RI-V R1 = V O RV R, = R, IT -V O V R 1= R2
-
Alexander Smith and his wife Allison are married and file a joint tax return for 2019. The Smiths live at 1234 Buena Vista Drive, Orlando, FL 32830. Alexander is a commuter airline pilot but took 6...
-
Wood Incorporated factored $150,000 of accounts receivable with Engram Factors Inc. on a with recourse basis. Engram assesses a 2% finance charge of the amount of accounts receivable and retains an...
-
What are the biggest challenges that users have with KMS? How can organizations get users to accept the use of the KMS? How might TAM or UTAUT help?
-
Describe the roles of managers, health-care professionals, and executives in an effective risk management system.
-
What are the process of decision making? What are the reasons for the employees leave the organization? What are the determinants of Human Behavior? Define ERG Theory?
-
Currently there exists in the literature and in the media much debate and angst over the solvency and future of Medicare and Medicaid (and Social Security, from which Medicare premiums are paid). The...
-
A class project requires students to work in small groups and then present their findings. Which Teams feature allows them to break into smaller groups during a larger meeting?
-
An entrepreneur is seeking to raise $250,000 in equity financing in exchange for a 20% equity stake. What is the postmoney valuation of the firm and the premoney valuation of the firm? 2 answers
-
What is the maximum volume of 0.25 M sodium hypochlorite solution (NaOCl, laundry bleach) that can be prepared by dilution of 1.00 L of 0.80 M NaOCl?
-
Why do some general managers fail?
-
What kind of general manager do you want to be?
-
How does one become an effective general manager?
Study smarter with the SolutionInn App