Question

What is the net upward force on an airplane wing of area 21.0 m2 if the speed of air flow is 200 m/s across the top of the wing and 175 m/s across the bottom? (The density of air where the airplane flies is ?air = 1.21 kg/m3.

Answer #1

here,

From Bernoulli's theorem we have

Pa + 0.5 p va^2 = Pb + 0.5 p vb^2

Where Pa and Pb represent pressure

p represents density

va and vb represent velocity

Data:

Net force = ?

Area = A = 10.2 m.s^-2

Velocity across the top...= va = 200 ms^-1

Velocity across the bottom. ..=vb = 175 ms^-1

Density of air , p = 1.21 kgm^-3

Pa - Pb = 0.5 × 1.21× (200^2 - 175^2)

P = 5671.9 pascal

Since P= F/A

**F = 270.1 newton**

**the net upward force on an airplane wing is 270.1
newton**

A small jet airplane has a total wing area of 67.5 m2
and a mass of 8.03 104 kg.
(a) If this jet is in horizontal flight, determine the pressure
difference between the lower and upper surfaces of the wings. in Pa
?
(b) When the speed of air traveling over the wing is 247 m/s,
determine the speed of air under the wing. Use 1.29
kg/m3 as the density of air. in m/s ?
(c) Which answer is correct...

An airplane has a mass of 48,000 kg, a wing area
of 300 m2, a maximum lift coefficient of 3.2, and a cruising
drag coefficient of 0.03 at an altitude of 12,000 m. Determine(a)
the takeoff speed at sea level, assuming it is 20 percent
over the stall speed, and (b) the thrust that the engines
must
deliver for a cruising speed of 900 km/h.

Let’s say this airfoil was used in a specific airplane. This
airplane is flying at 135 mph (60.4 m/s), has a wing area of 150
ft2 (13.94 m2), and flying at an angle of attack of 1º. How much
lift will the wings generate? Use the lift equation that was
discussed in Lecture 11, and give your answer in Newtons. Also, use
an air density of 1.22 kg/m3
** 1 degree of attack is 0.65.

A sound wave of frequency 349 Hz has an intensity of 4.03
?W/m2. What is the amplitude of the air
oscillations caused by this wave? (Take the speed of sound to be
343 m/s, and the density of air to be 1.21 kg/m3.)

What is the lift (in newtons) due to Bernoulli's principle on a
wing of area 78 m2m2 if the air passes over the top and bottom
surfaces at speeds of 260 m/sm/s and 150 m/sm/s, respectively?

Calculate the speed (in m/s) a spherical rain drop would achieve
falling from 2.10 km in the absence of air drag and with air drag.
Take the size across of the drop to be 9 mm, the density to be 1.00
✕ 103 kg/m3, and the surface area to be
πr2. (Assume the density of air is
1.21 kg/m3.)
(a)
in the absence of air drag
202.985 m/s (correct)
(b)
with air drag
9.8687 m/s (incorrect)

A bicycle rider has a drag area of 0.22 m2. She is riding at a
velocity of 8.3 m/s along the road and the air density is 1.2
kg/m3. Total mass of the rider and bike is 93 kg. The coefficient
of rolling resistance is 0.004. She is riding into a headwind with
velocity 1.8 m/s. The road is horizontal. What power (watts) must
the cyclist produce to maintain the speed of 8.3 m/s?

Calculate the speed (in m/s) a spherical rain drop would achieve
falling from 4.10 km in the absence of air drag and with air drag.
Take the size across of the drop to be 5 mm, the density to be 1.00
? 103 kg/m3, and the surface area to be
?r2. (Assume the density of air is
1.21 kg/m3.)
(a)in the absence of air drag.
(b) with air drag.

A model airplane of mass 0.4 kg is attached to a horizontal
string and flies in a horizontal circle of radius 5.9 m, making 2
revolutions every 7 s. (The weight of the plane is balanced by the
upward “lift” force of the air on the wings of the plane.) The
accelaration due to the gravity is 9.81 m/s2 . Find the speed of
the plane. Answer in units of m/s.
Find the tension in the string. Answer in units...

To maintain a constant speed, the force provided by a car’s
engine must equal the drag force plus the force of friction of the
road (the rolling resistance). Assume that the drag coefficient for
a Toyota Camry is 0.28, while for a Hummer it is 0.64. The density
of air at this temperature is 1.21 kg/m3.
s1 = 62 km/h
s2 = 110 km/h
A) What is the drag force at 62 km/h for a Toyota
Camry? (Drag area is...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 3 minutes ago

asked 4 minutes ago

asked 4 minutes ago

asked 5 minutes ago

asked 6 minutes ago

asked 8 minutes ago

asked 12 minutes ago

asked 14 minutes ago

asked 14 minutes ago

asked 17 minutes ago

asked 17 minutes ago