When testing a new car, the car drives with a constant speed v = 140 km/h. The power of car’s engine is P = 120 kW and we know that 80% of this power is con- verted to movement. Determine the drag coefficient in air if the cross section of the car has circular shape, its value is S = 3 m2 , and air can be described as a liquid with viscosity η = 2,2 · 10−3 Ns/m2 and density ρ = 1,2 kg/m3 . Calculate the Reynolds number and determine if the linear or quadratic drag equation is valid in this case or neither of them.
When testing a new car, the car drives with a constant speed v = 140 km/h. The power of car’s engine is P = 120 kW and we know that 80% of this power is con- verted to movement. Determine the drag coefficient in air if the cross section of the car has circular shape, its value is S = 3 m2 , and air can be described as a liquid with viscosity η = 2,2 · 10−3 Ns/m2 and density ρ = 1,2 kg/m3 . Calculate the Reynolds number and determine if the linear or quadratic drag equation is valid in this case or neither of them.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
When testing a new car, the car drives with a constant speed v = 140 km/h. The
power of car’s engine is P = 120 kW and we know that 80% of this power is con-
verted to movement. Determine the drag coefficient in air if the cross section of the
car has circular shape, its value is S = 3 m2
, and air can be described as a liquid
with viscosity η = 2,2 · 10−3 Ns/m2 and density ρ = 1,2 kg/m3
. Calculate the
Reynolds number and determine if the linear or quadratic drag equation is valid in
this case or neither of them.
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