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Daniel [21]
3 years ago
10

4 football is kicked with a speed of 18.0 m/s at an angle of 36.9to the horizontal. 8. How long is the football in the air? Negl

ect air resistance. A ) 1.1 s B C ) 2.2 D) 3.3 E) 4.0
Mathematics
1 answer:
SOVA2 [1]3 years ago
7 0

9514 1404 393

Answer:

  C)  2.2 seconds

Step-by-step explanation:

The initial vertical speed of the football is ...

  v = (18.0 m/s)sin(36.9°) ≈ 10.807 m/s

Since the ball starts and ends at ground level, its speed when it hits the ground is the same as its launch speed. That is, the acceleration due to gravity causes the velocity to change from +v to -v. The time required to do that is ...

  t = 2v/g = 2(10.807 m/s)/(9.8 m/s^2) = 21.614/9.8 s ≈ 2.206 s

The football is in the air about 2.2 seconds.

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In a study of births from New York State, data were collected from 4 hospitals and coded as follows: (1) Albany Medical Center (
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Answer:

No. See the explanation below.

Step-by-step explanation:

No makes sense.

For this case the codification used is just a notation to identify the hospital. No matter if the code is a numerical value not makes sense calculate the average for these numbers since that not represent any statistic useful for the study.

And the other reason why is not appropiate calculate the mean of these numbers is that if we calculate the mean we don't have a maning for this number since we can't say the mean for the codes is (a number) since that's irrrelevant for the study.

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DochEvi [55]
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hope this helps
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anygoal [31]

Answer:

x =1/3

Step-by-step explanation:

the zero quadratic function is x=1/3

5 0
3 years ago
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sasho [114]

<em>Ah, female problems, Amiright?</em>

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6 0
3 years ago
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4vir4ik [10]

Answer:

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Step-by-step explanation:

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4 0
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