The drag force, Fd, imposed by the surrounding air on a vehicle moving with velocity V is given by Fd= CdApV2/2where Ca is a constant called the drag coefficient, A is the projected frontal area of the vehicle, and pis the air density. An automobile is moving at V = 60 miles per hour with Ca = 0.28, A = 27 ft2, and p = 0.075 Ib/ft³. Determine the force, in Ibf, and the power, in hp, required to overcome aerodynamic drag.

The drag force, Fd, imposed by the surrounding air on a vehicle moving with velocity V is given by Fd= CdApV2/2where Ca is a constant called the drag coefficient, A is the projected frontal area of the vehicle, and pis the air density. An automobile is moving at V = 60 miles per hour with Ca = 0.28, A = 27 ft2, and p = 0.075 Ib/ft³. Determine the force, in Ibf, and the power, in hp, required to overcome aerodynamic drag.

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

See similar textbooks

Similar questions

Please give an correct answer A body weighs 900 lbf when exposed to a standard earth gravity g= 32.174 ft/s². (a) What is its mass in kg? (b) What will the weight of this body be in N if it is exposed to the moon's standard acceleration go 1.62 m/s²? (c) How fast will the body accelerate if a net force of 300 lbf is applied to it on the moon or on the earth?
When a 2.30-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.13 cm. (a) What is the force constant of the spring? N/m(b) If the 2.30-kg object is removed, how far will the spring stretch if a 1.15-kg block is hung on it? cm(c) How much work must an external agent do to stretch the same spring 8.60 cm from its unstretched position? J
for the opposite figure, a=1.24 m, b=1.55 m, r=3.1 m, and density of the shape is 18.6 kg/m? r a b total mass (kg) XG (m) YG (m)
Q2: A 1.78 L four-stroke petrol engine was tested at 2500 rpm. The developed brake power is 28 kW and the brake specific fuel consumption (bsfc) is 290 g/kW.hr. Air consumption is measured by means of air-box method with orifice diameter 3.2-cm and discharge coefficient 0.62 and the pressure difference across the orifice is 150-mm-water. The ambient pressure and the temperature in the test room is 101 kPa and 20 °C. Assume: CV = 43.9 MJ/kg, PH20 =10³ kg/m³, comb = 98%, mech = 87%. (i) Determine the bmep, AFR, №v, power loss as friction, th,b. (ii) draw up the heat balance sheet on percentage basis, if the cooling water flow is 15 kg/min; rise in temperature of cooling water is 33 °C; exhaust gas temperature is 485 °C; Cpw is 4.2 kJ/kg.K and Cpexh is 1.25 kJ/kg.K.
2/A- Airbus 320 fly in steady level flight with altitude 10.5 km and the density at this level p=0.3877 kg/m³, mass of aircraft 6500 kg, wing area 124 m², CD = 0.015+ 0.02 CL², maximum thrust at sea level 53.015 kN. Calculate maximum velocity. C00
Q5/A 400 m² light-colored swimming pool is located in a normal suburban site, where the measured wind speed at 10 m height is 2 m/s. The water temperature is 25 °C, the ambient air temperature is 10 °C, and relative humidity is 60%. There are no swimmers in the pool, the temperature of the make-up water is 20 °C, and the solar irradiation on a horizontal surface for the day is 15 MJ/m2-d. Neglect heat losses due to evaporation and radiation. How much energy must the solar system supply (Qss) to the pool to keep its temperature to 25 °C? Take: a = Solar absorptance (a = 0.85 for light-colored pools; a = 0.90 for dark colored pools).
The temperature at 11 000 m in the standard atmosphere, using a parabolic interpolation of the entries in Table B.3, is nearest: (A) -62.4°C (B) -53.6°C(C) -32.8°C (D) -17.3°C
A sample of powdered zinc oxide, density 5.60g/cm 3 , is allowed to settle under the accelerationof gravity, 981 cm/sec 2 , at 25 25°C. The rate ofsettling, v, is 7.30 ×10 3 cm/sec; the density ofthe medium is 1.01 g/cm 3 , and its viscosity is 1centipoise = 0.01 poise or 0.01 g/cm sec.Calculate the Stokes diameter of the zinc oxidepowder.Problem:
In English Engineering units, the specifi c heat c p of air atroom temperature is approximately 0.24 Btu/(lbm-° F).When working with kinetic energy relations, it is more appropriateto express c p as a velocity-squared per absolutedegree. Give the numerical value, in this form, of c p for airin ( a ) SI units, and ( b ) BG units.
Fluid mechanics urgent
There is an airtight box made of a 1 mm thick metal sheet. The dimensions of the box are 10 cm wide, 30 cm long and an unknown height "h". The box is at 800 ° C and inside it contains a gas, which escapes by diffusion through its walls. If the gas flow is 0.5 g / (cm2 hour), determine the value of the height h in centimeters so that 1200 grams of gas escape in 2 hours.
A body weight 100 N and 70 N in air and water respectively. the density of body will be A 2222.30 kg/m` B 7777.33 kg/m' WRONG C 6666.33 kg/m' 3333.33 kg/m'