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The drag coefficient of a car is to be determined experimentally with a full scaleWind tunnel...
The drag coefficient of a car at the design conditions of 1 atm, 25°C, and 90...
The drag coefficient of a car at the design conditions of 1 atm, 25°C, and 90 km/h is to be determined experimentally in a large wind tunnel in a full-scale test. The height and width of the car are 1.25 m and 1.65 m, respectively. If the horizontal force acting on the car is measured to be 300 N, determine the total drag coefficient of this car. Take the density of air at 1 atm and 25°C as p 1164...
A new sports car has a drag coefficient of 0.29, a frontal area of 1.9 m2...
A new sports car has a drag coefficient of 0.29, a frontal area of 1.9 m2 , and is traveling at 160 km/h. How much power is required to overcome aerodynamic resistance if ρ = 1.2256 kg/m3
The answer is given as V = 60.3 mph, but no solution is provided The aerodynamic drag on a car depends on the shape of the car. For example, the car shown in Fig. 3 has a drag coefficient of 0.36 wit...
The answer is given as V = 60.3 mph, but no solution is
provided
The aerodynamic drag on a car depends on the shape of the car. For example, the car shown in Fig. 3 has a drag coefficient of 0.36 with the windows and roof closed. With the windows and roof open, the drag coefficient increases to 045. With the windows and roof open, at what speed is the amount of power needed to overcome aerodynamic drag the same...
The aerodynamic drag of a new sports car is to be predicted at a speed of 75 km/h at an air temperature of 25°C. Automot...
The aerodynamic drag of a new sports car is to be predicted at a speed of 75 km/h at an air temperature of 25°C. Automotive engineers build a one-fifth scale model of the car to test in a wind tunnel. It is winter and the wind tunnel is located in an unheated building. The temperature of the wind tunnel air is only 5°C. a) Determine how fast the engineers should run the wind tunnel in order to achieve similarity between...
A 2790 lb car has a frontal cross-sectional area A of 21.1 ft2, a drag coefficient...
A 2790 lb car has a frontal cross-sectional area A of 21.1 ft2, a drag coefficient Cd of 0.25, and a drive (or tractive) force of 280 lbs. Assume an air density of 2.3x10-3 slug/ft?, Here is a list of frontal areas and drag coefficients for cars. This web site has interesting information on how the physics we are learning is incorporated into video games with cars. NOTES IMAGES DISCUSS UNITS STATS HELP Part Description Answer chk History 11.11 pts....
A car travels at a constant velocity of 90 km/h along an expressway under-ambient temperature and...
A car travels at a constant velocity of 90 km/h along an
expressway under-ambient temperature and pressure conditions. The
width of the car is 1.5 m while its height is 1.2 m. The wheelbase
(length between the front and rear wheels) is 2.5 m. The drag
coefficient is 0.22.
[Use
air, ambient density of the air = 1.12 kg/m3 and,
fuel, density of the fuel = 930 kg/m3. You may neglect
any energy contained in the exhaust gases and any...
A Toyota Prius has the following attributes: Drag Coefficient Ca = 0.24, Frontal Area Af =...
A Toyota Prius has the following attributes: Drag Coefficient Ca = 0.24, Frontal Area Af = 25.83 ft?, weight = 3064 lb, and Speed = 90 mph. Use air density p = 0.002378 slugs/ft3. The vehicle from problem 2 above is travelling down a 4% grade on pavement located at 5000-ft altitude (p = 0.002045 slugs/ft?) with its maximum speed. Overall resistance for the motion of the car at maximum speed is overcome with a power of 28hp. Determine the...
To reduce the drag coefficient and thus to improve the fuel efficiency of cars, the design...
To reduce the drag coefficient and thus to improve the fuel efficiency of cars, the design of side rearview mirrors has changed drastically in recent decades from a simple circular plate to a streamlined shape. Determine the amount of fuel and money saved per year as a result of replacing a 13-cm-diameter flat mirror by one with a hemispherical back, as shown in the figure. Assume the car is driven 21,200 km a year at an average speed of 80...
2. The electric vehicle Tesla Model S has a drag coefficient of 0.24, a mass of 2100 kg, and a frontal area of 2.4 m2....
2. The electric vehicle Tesla Model S has a drag coefficient of 0.24, a mass of 2100 kg, and a frontal area of 2.4 m2. The coefficient of rolling resistance of its tires is 0.01. Recall the density of air at sea level is 1.3 kg/m3. How much kinetic energy is required to overcome rolling resistance and air resistance (drag) at Autobahn speeds of 180 km/hr for a 200 km trip? How much useful energy (in MJ) and money (in...
Problem 3 The retarding force, FD, on a car can be repre- sented by To simplify...
Problem 3 The retarding force, FD, on a car can be repre- sented by To simplify the math, assume that ai - 0. A new electric car is being tested by driving it on a perfectly horizontal road on a windless day. The test consists of driving the vehicle at constant speed and measuring the energy used up from the battery. Exactly 15 kWh of energy is used in each case. When the car is driven at a constant 100...
The drag coefficient of a car at the design conditions of 1 atm, 25°C, and 90 km/h is to be determined experimentally in a large wind tunnel in a full-scale test. The height and width of the car are 1.25 m and 1.65 m, respectively. If the horizontal force acting on the car is measured to be 300 N, determine the total drag coefficient of this car. Take the density of air at 1 atm and 25°C as p 1164...
The answer is given as V = 60.3 mph, but no solution is
provided
The aerodynamic drag on a car depends on the shape of the car. For example, the car shown in Fig. 3 has a drag coefficient of 0.36 with the windows and roof closed. With the windows and roof open, the drag coefficient increases to 045. With the windows and roof open, at what speed is the amount of power needed to overcome aerodynamic drag the same...
A 2790 lb car has a frontal cross-sectional area A of 21.1 ft2, a drag coefficient Cd of 0.25, and a drive (or tractive) force of 280 lbs. Assume an air density of 2.3x10-3 slug/ft?, Here is a list of frontal areas and drag coefficients for cars. This web site has interesting information on how the physics we are learning is incorporated into video games with cars. NOTES IMAGES DISCUSS UNITS STATS HELP Part Description Answer chk History 11.11 pts....
A car travels at a constant velocity of 90 km/h along an
expressway under-ambient temperature and pressure conditions. The
width of the car is 1.5 m while its height is 1.2 m. The wheelbase
(length between the front and rear wheels) is 2.5 m. The drag
coefficient is 0.22.
[Use
air, ambient density of the air = 1.12 kg/m3 and,
fuel, density of the fuel = 930 kg/m3. You may neglect
any energy contained in the exhaust gases and any...
A Toyota Prius has the following attributes: Drag Coefficient Ca = 0.24, Frontal Area Af = 25.83 ft?, weight = 3064 lb, and Speed = 90 mph. Use air density p = 0.002378 slugs/ft3. The vehicle from problem 2 above is travelling down a 4% grade on pavement located at 5000-ft altitude (p = 0.002045 slugs/ft?) with its maximum speed. Overall resistance for the motion of the car at maximum speed is overcome with a power of 28hp. Determine the...
To reduce the drag coefficient and thus to improve the fuel efficiency of cars, the design of side rearview mirrors has changed drastically in recent decades from a simple circular plate to a streamlined shape. Determine the amount of fuel and money saved per year as a result of replacing a 13-cm-diameter flat mirror by one with a hemispherical back, as shown in the figure. Assume the car is driven 21,200 km a year at an average speed of 80...
2. The electric vehicle Tesla Model S has a drag coefficient of 0.24, a mass of 2100 kg, and a frontal area of 2.4 m2. The coefficient of rolling resistance of its tires is 0.01. Recall the density of air at sea level is 1.3 kg/m3. How much kinetic energy is required to overcome rolling resistance and air resistance (drag) at Autobahn speeds of 180 km/hr for a 200 km trip? How much useful energy (in MJ) and money (in...
Problem 3 The retarding force, FD, on a car can be repre- sented by To simplify the math, assume that ai - 0. A new electric car is being tested by driving it on a perfectly horizontal road on a windless day. The test consists of driving the vehicle at constant speed and measuring the energy used up from the battery. Exactly 15 kWh of energy is used in each case. When the car is driven at a constant 100...
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