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makkiz [27]
3 years ago
10

Someone please help me it’s the last question just someone please explain and answer thanks

Mathematics
1 answer:
quester [9]3 years ago
8 0

Answer:

Brackish Water will be the answer as it tells us that we have to classify water with a salinity of 2%. So it falls in the Brackish water table

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The terminal velocity of a person falling through air is about 100Km/hr. The acceleration due to gravity is 10ms−2. Use this inf
Aleonysh [2.5K]

The question here is how long does it take for a falling person to reach the 90% of this terminal velocity. The computation is:

The terminal velocity vt fulfills v'=0. Therefore vt=g/c, and so c=g/vt = 10/(100*1000/3600) = 36,000/100,000... /s. Incorporating the differential equation shows that the time needed to reach velocity v is 

t= ln [g / (g-c*v)] / c. 

With v=.9 vt =.9 g/c,

t = ln [10] /c = 6.4 sec.

8 0
3 years ago
An engineer on the ground is looking at the top of a building. The angle of elevation to the top of the building is 22°. The eng
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Let the distance from the engineer to the base of the building be x, then
tan 22 = 450/x
x = 450/tan 22 = 1,113.79

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5 0
3 years ago
During a recent test in his Business Skills class, Lionel typed 207 words in 5 minutes .
maks197457 [2]
41.4 wph because if you divide 207 by 5 you get 41.4
5 0
3 years ago
Find the surface area of the pyramid. The side lengths of the base are equal. Square pyramid with base edge of 12 centimeters, a
sdas [7]

Answer:

the surface area of the square pyramid is 576.66 cm^2

Step-by-step explanation:

The computation of the surface area of square pyramid is given below:

A = a^2  + 2a × √a^2 ÷ √4 + √h^2

where

a = 12 cm

h = 17 cm

Now put the value of a and h in the above formula

= 12^2 + 2(12) × √12^2 ÷ √4 + √17^2

= 576.66 cm^2

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8 0
2 years ago
Find the distance between the points (2,8) and (-1,9).
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Answer:

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Step-by-step explanation:

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