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stepladder [879]
3 years ago
8

Col. Joe Kittinger of the United States Air Force crossed the Atlantic Ocean in nearly 86 hours. The distance he traveled was 57

000 m. Suppose Col. Kittinger is moving with a constant acceleration during most of his flight and that his final speed is 10.0 percent greater than his initial speed. Find the initial speed based on this data.
Physics
1 answer:
Savatey [412]3 years ago
7 0

Answer:

Initial speed Vo=631.229 mi/h

Explanation:

For this problem, I used miles instead of meters, because that seems more accurate. Since the final speed is 10% (0.1) higher than initial, then mathematically it means

V_{f}=V_{o}+0.1*V_{o}=1.1*V_{o}

First, find the acceleration,  with this formula

<em>V^{2} _{f}-V^{2}_{o}=2*a*dist</em>

<em>Which results in</em>

a=\frac{(1.1*V _{o})^{2}-V^{2}_{o}}{2*57000} =0.000002*V_{o}^{2}

Now substitute in this equation:

V _{f}-V_{o}=a*t\\ (1.1-1)*V_{o}=0.000002*V_{o}^{2}*86

This became in a quadratic equation. Dividing both sides by initial speed and solving and, since we used time in Hours and for distance miles, then the speed should have units of miles per hour:

0.1*V_{o}=0.000158*V_{o}x^{2} \\ V_{o}=631.229mi/h

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3 years ago
An object glides on a horizontal tabletop with a coefficient of kinetic friction of 0.5. If its initial velocity is 4.3 m/s, how
Shkiper50 [21]

Answer:

Time, t = 0.87 seconds

Explanation:

Given that,

Initial velocity of the object, u = 4.3 m/s

The coefficient of kinetic friction between horizontal tabletop and the object is 0.5

We need to find the time taken by the object for the object to come to rest i.e. final velocity will be 0.

Using first equation of motion to find it as :

v=u+at

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0=u+\mu gt

t=\dfrac{u}{\mu g}\\\\t=\dfrac{4.3}{0.5\times 9.8}\\\\t=0.87\ s

So, the time taken by the object to come at rest is 0.87 seconds. Hence, this is the required solution.

8 0
3 years ago
An egg of mass 0.060 kg is dropped from the top of a building. Just before it reaches the ground, it has a total kinetic energy
3241004551 [841]

The velocity is 14 m/s

The parameters given on the question are

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K.E= 1/2mv²

5.9= 1/2 × 0.060 × v²

5.9= 0.5 × 0.060v²

5.9= 003v²

v²= 5.9/0.03

v²= 196.66

v= √196.66

v= 14 m/s

Hence the velocity of the egg before it strikes the ground is 14 m/s

brainly.com/question/2084569?referrer=searchResults

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Explanation:

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Answer:

its a negative work, not a negative force

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then when i put negative work it was right

Hope it help:)♥︎ plz mark me as brainliest

8 0
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