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IrinaK [193]
4 years ago
6

The drag coefficient for a newly designed hybrid car is predicted to be 0.21. the cross-sectional area of the car is 30 ft2. det

ermine the aerodynamic drag on the car when it is driven through still air at 55 mph.
Physics
1 answer:
Nadya [2.5K]4 years ago
3 0
Drag, D = 1/2*Drag coefficient*density of air*velocity^2*Frontal area

Where,
Density of air ≈ 1.225 kg/m^3
Velocity = 55 mph = 24.5872 m/s
Drag coefficient = 0.21
Frontal area = 30 ft^2 = 2.78709 m^2

Substituting;
D = 0.5*0.21*1.225*24.5872^2*2.78709 = 216.72 N
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Fundamental frequency,

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=(50)/0.1×10−3/10−22×0.6−−−−−−−−−−−−−−−−−−−√

=58.96Hz

Let, n th harmonic is the hightest frequency, then

(58.93)n = 20000

∴N=339.38

Hence, 339 is the highest frequency.

∴fmax=(339)(58.93)Hz=19977Hz.

<h3>What is frequency?</h3>

In physics, frequency is the number of waves that pass a given point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time. After moving through a sequence of situations or locations and then returning to its initial position, a body in periodic motion is said to have experienced one cycle or one vibration. See also simple harmonic motion and angular velocity.

learn more about frequency refer:

brainly.com/question/254161

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3 years ago
I know that the PE will be the same for all the objects, but other then that I'm confused on what is correct and what isn't. ​
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Answer:

Neither aspects of Dominique are correct.

Explanation:

They will not have the same speed before hitting the ground.

The block C has an initial horizontal velocity v₀ₓ , therefore the total ultimate speed before hitting the ground is  v = √ v₀ₓ² + vy²

It didn't matter how the blocks were dropped, they all landed at the same time. If any block has an initial vertical velocity it will have a higher end velocity. If Dominique means dropped from the rest then the previous claim is true. It is important how they were dropped.

The Dominique must said : The vertical speed will be the same because of conservation of energy.

The fact is,  they all landed at the same time and that is true. And it is important how they are thrown away.

God is with you!!!

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Hope this helps!

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