Mindtap For Erjavec/thompson's Automotive Technology: A Systems Approach, 4 Terms Printed Access Card (mindtap Course List)
7th Edition
ISBN: 9781337794381
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Chapter 43, Problem 8SA
What is checked during a stall test?
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A prototype automobile is designed to travel at 65 km/hr. A model of this design is tested in a wind tunnel with identical standard sea-
level air properties at a 1:5 scale. The measured model drag is 529 N, enforcing dynamic similarity. Determine (a) the drag force on the
prototype and (b) the power required to overcome this drag. See the equation
Vm
m
=
D
V Dm
(a) Dp = i
(b) Pp = i
N
hp
A new blimp will move at 6 m/s in 20°C air, and we want to predict the drag force. Using a 1: 14-scale model in water at 20°C and
measuring a 2500-N drag force on the model, determine (a) the required water velocity, (b) the drag on the prototype blimp and, (c) the
power that will be required to propel it through the air.
(a) Vm = i
(b) Dp = i
(c) Pp = i
m/s
N
W
Drag measurements were taken for a sphere, with a diameter of 5 cm, moving at 3.7 m/s in water at 20°C. The resulting drag on the
sphere was 10 N. For a balloon with 1-m diameter rising in air with standard temperature and pressure, determine (a) the velocity if
Reynolds number similarity is enforced and (b) the drag force if the drag coefficient in the equation below is the dependent pi term.
li ε pVI
D
1
= CD = Q
μ
(a) Vp = i
(b) Dp = i
m/s
N
Chapter 43 Solutions
Mindtap For Erjavec/thompson's Automotive Technology: A Systems Approach, 4 Terms Printed Access Card (mindtap Course List)
Ch. 43 - What is the most probable cause of a low fluid...Ch. 43 - What does milky colored ATF indicate?Ch. 43 - What do varnish or gum deposits on the dipstick...Ch. 43 - Typically during a pressure test, the pressure...Ch. 43 - List five reasons for replacing a torque...Ch. 43 - Explain why oil circuit diagrams are invaluable...Ch. 43 - Explain how a plugged fluid cooler can cause a...Ch. 43 - What is checked during a stall test?Ch. 43 - Ifa transmission does not have a dipstick, how do...Ch. 43 - What should you do if a valve does not move freely...
Ch. 43 - Which of the following is the most likely cause...Ch. 43 - When should the ATF level be checked on most...Ch. 43 - Pressure readings reveal possible problems in...Ch. 43 - Which of the following is a probable cause for a...Ch. 43 - When rebuilding an automatic transmission, which...Ch. 43 - Technician A says that a prerequisite to accurate...Ch. 43 - While discussing proper band adjustment...Ch. 43 - Technician A says that if the shift for all...Ch. 43 - Technician A says that the only positive way to...Ch. 43 - Technician A says that delayed shifting can be...Ch. 43 - While checking the condition of a cars ATF:...Ch. 43 - While discussing the results of an oil pressure...Ch. 43 - While discussing a pressure test: Technician A...Ch. 43 - While checking the engine and transmission mounts...Ch. 43 - While discussing the cause of aerated fluid in a...
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