ENGINEERING FUNDAMENTALS
6th Edition
ISBN: 9781337705011
Author: MOAVENI
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Question
Chapter 14, Problem 11P
To determine
Determine the power requirement to overcome air resistance for a car.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
The air resistance to the motion of a vehicle is something important that engineers investigate. As you may also know, the drag force acting on a car is determined experiementally by placing the car in a wind tunnel. For a given car, the experimental data is generally represented by a single coefficient that is called the drag coefficient. It is given by the relationship
C(4)=F(d)/ 1/2 pV^2 (A)
C(d)= drag coefficient
F(d)= measured drag force (lb)
p= air density (slugs/ft^3)
V= air speed inside the wind tunnel (ft/s)
A=frontal area of the car (ft^2)
What is the appropiate unit for C, if the proceeding equation is to be homogeneous in units? show all steps of your work
The air resistance to the motion of a vehicle
is something important that engineers
investigate. As you may also know, the
drag force acting on a car is determined
experimentally by placing the car in a wind
tunnel. For a given car, the experimental
data is generally represented by a single
coefficient that is called the drag coefficient.
It is given by the relationship:
Fa
C, =
where
C, = drag coefficient
F, = measured drag force (Ib)
p = air density (slugs/ft')
V = air speed inside the wind tunnel (ft/s)
A = frontal area of the car (ft²)
What is the appropriate unit for C, if the
preceding equation is to be homogeneous in
units? Show all steps of your work.
A steel tire has a dimensions indicated in the figure below. At 78 degrees Celsius, the said tire was fit into a 1.8m to an
engine wheel with 24 degrees Celsius. Calculate the contact pressure between the tire and the wheel after fitting together
due to colling of 24 degrees Celsius. The coefficient of expansion due to temperature of the tire is 12.3 micrometer/ m-
degrees Celsius and Modulus of Elasticity is FN GPa.
12 mm
EN=70
| 200 mm
MN=76
900mm wide steel tire+
SN=50
12 mm
Note: Neglect the deformation of the wheel due to the pressure of the tire
Chapter 14 Solutions
ENGINEERING FUNDAMENTALS
Ch. 14.2 - Prob. 1BYGCh. 14.2 - Prob. 2BYGCh. 14.2 - Prob. 3BYGCh. 14.2 - Prob. 4BYGCh. 14.2 - Prob. 5BYGCh. 14.2 - Prob. BYGVCh. 14.4 - Prob. 1BYGCh. 14.4 - Prob. 2BYGCh. 14.4 - Prob. 3BYGCh. 14.4 - Prob. 4BYG
Ch. 14.4 - Prob. 5BYGCh. 14.4 - Prob. BYGVCh. 14.5 - Prob. 1BYGCh. 14.5 - Prob. 2BYGCh. 14.5 - Prob. 3BYGCh. 14.5 - Prob. 4BYGCh. 14.5 - Prob. BYGVCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - Prob. 3PCh. 14 - Prob. 4PCh. 14 - Prob. 5PCh. 14 - Prob. 6PCh. 14 - Prob. 7PCh. 14 - Using Excel, create a table that shows the...Ch. 14 - Using Excel, create a table that shows the...Ch. 14 - Prob. 10PCh. 14 - Prob. 11PCh. 14 - Prob. 12PCh. 14 - Prob. 13PCh. 14 - Prob. 14PCh. 14 - Prob. 15PCh. 14 - Prob. 16PCh. 14 - Prob. 17PCh. 14 - Prob. 18PCh. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Prob. 22PCh. 14 - Prob. 23PCh. 14 - Prob. 24PCh. 14 - Prob. 25PCh. 14 - Prob. 26PCh. 14 - Prob. 27PCh. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Prob. 31PCh. 14 - Prob. 32PCh. 14 - Prob. 33PCh. 14 - Prob. 34PCh. 14 - Prob. 35P
Knowledge Booster
Similar questions
- DYNAMICS OF RIGID BODIES Two masses of 14 kg and 7 kg connected by a flexible inextensible cord rest on a smooth plane inclined 45° with the horizontal as shown in the figure. When the masses are released, what will be the tension T in the cord? Assume the coefficient of friction between the plane and the 14-kg mass is 1/4 and between the plane and the 7-kg mass is 3/8? 7 kg 14 kg 450arrow_forward3.4 The load on a cantilever beam of length L consists of a load Pat the tip (free end) and a distributed load wacting over the entire length. Both Pand ware random variables. The length is assumed to be deterministic, and its value is 6 ft. The statistical parameters of Pand ware as follows (1 lb = 4.448 N; 1 ft = 0.3048 m): Hp = 4000 lb Hw = 50 lb/ft Vp = 10% Vụ = 10% %3D A. Calculate the mean and standard deviation of the internal bending moment at the fixed end. B. Calculate the mean and standard deviation of the internal shear force at the fixed end. C. If both Pand w are normal random variables, what is the probability that the bending moment at the fixed end will exceed 29 k-ft (1 k-ft = 1.356 kN-m)? D. If both Pand w are normal random variables, what is the probability that the shear force at the fixed end will exceed 5000 lb?arrow_forward14.11. As we explained in Chapter 7, the air resistance to motion of a vehicle is something important that engineers investigate. As you may also know, the drag force acting on a car is determined experimentally by placing the car in a wind tunnel. The air speed inside the tunnel is changed, and the drag force acting on the car is measured. For a given car, the experimental data is generally represented by a single coefficient that is called drag coefficient. It is defined by the following relationship: Fa Cả where Ca = drag coefficient (unitless) Fa = measured drag force (N or 1b) p= air density (kg/m³ or slugs/ft') V = air speed inside the wind tunnel (m/s or ft/s) A = frontal area of the car (m? or ft') The frontal area A represents the frontal projection of the car's area and could be approximated simply by multiplying 0.85 times the width and the height of a rectangle that outlines the front of a car. This is the area that you see when you view the car from a direction normal to…arrow_forward
- Consider the parallel springs shown in the accompanying figure. Realizing that the deflection of each spring in parallel is the same and the applied force must equal the sum of forces in individual springs, show that for springs in parallel the equivalent spring constant Ke isarrow_forwardA structural member with a rectangular cross section as shown in the accompanying figure is used to support a load of 2500 N. What type of material do you recommend be used to carry the load safely? Base your calculations on the yield strength and a factor of safety of 2.0.arrow_forwardA particles moves in a straight line with the acceleration shown in the motion curve given. Knowing that the it starts from the origin with initial velocity of -18 ft per second, plot the velocity - time and distance time curves within 0 to 20 seconds. Compute also the velocity, position and total distance traveled at t = 12 seconds. Please write clearly the numbers and letters. Step by step solution would make me understand it more. Draw all necessary figures. Will give a rating. Thank you!arrow_forward
- Illustrate a uniform silver sphere and a uniform gold sphere that have the same mass with a ratio of 1.22:1 (radius of the silver sphere to the radius of the gold sphere).arrow_forwardThe value of viscosity of a fluid represents a measure of how easily the given fluid can flow. The higher the viscosity value is, the more resistance the fluid offers to flow. For example, it would require less energy to transport water in a pipe than it would to transport motor oil or glycerin. The viscosity of many fluids is governed by Newton's law of viscosity du T = µ- dy where T = shear stress (N/m²) µ = viscosity du = change in flow speed (m/s) over a height dy (m) What are the appropriate units for viscosity?arrow_forwardDraw a sketch of the Maxwell model and label all components. Draw a graph showing displacement versus time when the model is subjected to a constant force for a time period t and then released. Comment on why the model responds this way.arrow_forward
- d) The viscosity of a fluid is to be measured using a viscometer constructed of two 750 mm long concentric cylinders. The outer diameter of the inner cylinder is 150 mm and the gap between the two cylinders is 1.2 mm. The inner cylinder is rotated at 200 rpm and the torque is measured to be 10 Nm. a) Derive a generals expression for the viscosity of a fluid using this type of viscometer, and; b) Determine the viscosity of the fluid for the experiment above. Shaft е -Cylinder - Velocity Profilearrow_forwardExternal Problem 2: Dimensional analysis and similarity The viscous torque T produced on a disc rotating in a liquid depends upon the characteristic dimension D, the rotational speed N, the density pand the dynamic viscosity u. a) Show that there are two non-dimensional parameters written as: T PND and 2 b) In order to predict the torque on a disc of 0.5 m of diameter which rotates in oil at 200 rpm, a model is made to a scale of 1/5. The model is rotated in water. Calculate the speed of rotation of the model necessary to simulate the rotation of the real disc. c) When the model is tested at 18.75 rpm, the torque was 0.02 N.m. Predict the torque on the full size disc at 200 rpm. Notes: For the oil: the density is 750 kg/m and the dynamic viscosity is 0.2 N.s/m For water: the density is 1000 kg/ m and the dynamic viscosity is 0.001NS/m. kg.m 1N 1arrow_forwardA pole is at an angle with a force F applied at a different angle at the end (as shown in figure with parameters defined in table). What are the magnitudes of the components of the force parallel and perpendicular to the pole? z F NG SA 2021 Cathy Zupke parameter value units F 400 lb 4 ft L2 La 2 ft ft 40 55 The magnitude of the component of F parallel to pole= lb. The magnitude of the component of F perpendicular to pole= = lb.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Engineering Fundamentals: An Introduction to Engi...Civil EngineeringISBN:9781305084766Author:Saeed MoaveniPublisher:Cengage Learning
Engineering Fundamentals: An Introduction to Engi...
Civil Engineering
ISBN:9781305084766
Author:Saeed Moaveni
Publisher:Cengage Learning