Which of the following BEST explains why stability is an important skill for athletes?
2 answers:
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Answer:
1. equilibrium
2. bottom
3. bottom
4. nowhere
5. bottom
6. top & bottom
7. equilibrium
8. equilibrium
1. No
2. Yes
Explanation:
According to the following equation of motion for SHM:
where A is the amplitude, ω is the angular frequency, and ∅ is the phase angle.
Furthermore, the velocity and acceleration functions are as follows:
1. The acceleration is zero at the equilibrium. At the equilibrium, the net force on the object is zero. And according to Newton's Second Law, if the net force is zero, then the acceleration is zero as well.
2. The forces on the object in a vertical spring are the weight of the object and the spring force.
F = mg - kx
Since mg is constant along the motion, then the net force is maximum at the amplitude. For the special case in this question, the mass is always below the rest length of the spring. So the net force is maximum at the lower amplitude, because x is greater in magnitude at the lower amplitude. According to Newton's Second Law, acceleration is proportional to the net force, hence the acceleration is at a maximum at the bottom.
3. As explained above, the magnitude of the net force is at a maximum at the lower amplitude, that is bottom.
4. The spring force is defined by Hooke's Law: F = -kx. Since the oscillation is small enough so that the mass is always below the rest length of the spring, then x is always greater than zero, hence nowhere in the motion will the spring force becomes zero.
5. As explained above, the force of gravity is constant and the spring force is proportional to the displacement, x. Therefore, the spring force is at a maximum at the lower amplitude, that is bottom.
6. The speed is zero when the mass is instantaneously at rest, that is the amplitude.
7. The net force on the mass is zero at the equilibrium.
8. The speed is at a maximum at the equilibrium.
1. We will use the equation of motions given above. For simplicity, let's take ∅ = 0. At half its amplitude:
Then the velocity at that point is
The maximum speed is where the acceleration is equal to zero:
Comparing the maximum velocity to the velocity at A/2 yields that it is not half the maximum velocity:
2. The maximum acceleration is at the amplitude.
And the acceleration at A/2 is
Comparing these two results yields that the acceleration at half the amplitude is half the maximum acceleration.
Answer
given,
Pressure on the top wing = 265 m/s
speed of underneath wings = 234 m/s
mass of the airplane = 7.2 × 10³ kg
density of air = 1.29 kg/m³
using Bernoulli's equation
Applying newtons second law
2 Δ P x A - mg = 0
A = 3.53 m²