An airplane is cruising along in a horizontal level flight at a constant velocity, heading due west.
(a) If the weight of the plane is 5.54 104 N, what is the net force on the plane?
(b) With what force does the air push upward on the plane?
This is a thinking exercise.
a) CONSTANT VELOCITY, zero acceleration.
netforce=mass*acceleration
b) What is the weight of the airplane?
The weight of the airplane is 5.54*10^4
Thanks for your help
A sound source producing 1.00-{\rm kHz} waves moves toward a stationary listener atone-half the speed of sound.
The frequency that the listener will hear is2000 Hz.
when the source is stationary and the listener moves towardthe source at one-half the speed of sound, the frequency that thelistener hear became 1500 Hz.
Explain on physical grounds why thetwo frequencies differ.
To answer these questions, we need to understand the forces acting on the airplane during horizontal level flight.
(a) The net force on the plane is the sum of all the forces acting on it. In level flight, there are usually four main forces at play: weight, lift, thrust, and drag.
Weight (W) is the force pulling the airplane downwards due to gravity. In this case, the weight of the plane is given as 5.54 * 10^4 N.
Lift (L) is the force exerted by the air on the wings of the plane. In level flight, lift is equal to weight, which means L = W. Since we know W, we can say that the lift is also 5.54 * 10^4 N.
Thrust (T) is the force provided by the engines, pushing the plane forward. In this case, the question specifies that the airplane is cruising at a constant velocity, which means there is no acceleration. Therefore, the thrust is equal to the drag force, but we do not have the information to calculate it.
To find the net force, we need to sum up the forces in the horizontal direction. Since the airplane is cruising horizontally, the lift and weight forces are perpendicular to the direction of motion and do not contribute to the net force. Therefore, the net force on the plane is equal to zero N.
(b) The force with which the air pushes upward on the plane is the lift force (L). We have already determined that the lift force is equal to the weight of the plane, which is 5.54 * 10^4 N.
Therefore, the force with which the air pushes upward on the plane is also 5.54 * 10^4 N.