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3 years ago

Will mark the brainliest

Physics

1 answer:

Alchen [17]3 years ago

8 0

Answer:

0.1 m

Explanation:

From the question given above, the following data were obtained:

Mass (m) of ball = 4 Kg

Acceleration due to gravity (g) = 9.8 m/s²

Energy (E) = 4 J

Height (h) =?

The height (h) can be obtained by using the following formula:

E = mgh

4 = 4 × 9.8 × h

4 = 39.2 × h

Divide both side by 39.2

h = 4 / 39.2

h = 0.1 m

Thus, the value of h is 0.1 m

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Celina has a water sample that’s contaminated with salt and microorganisms. Which method should she use to purify the water?

TEA [102]

Answer:

Reverse Osmosis and UV Treatment

Explanation:

Reverse Osmosis, commonly known as RO, process is very effective in removing salt content from water. This process is known as desalination. IN RO, a partially permeable membrane is used to remove unwanted molecules, ions, and large particles. RO will take care of both desalination and purification of water.

Further UV treatment can be done to kill any remaining microorganisms as these microorganisms can not withstand UV radiation.

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3 years ago

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A device for acclimating military pilots to the high accelerations they must experience consists of a horizontal beam that rotat

Natali [406]

centripetal acceleration is given by formula

$a_c = \omega^2*R$

given that

$a_c = 34.1 m/s^2$

$R = 5.91 m$

now we have

$\omega^2 R = 34.1$

$\omega^2 * 5.91 = 34.1$

$\omega^2 = 5.77$

$\omega = 2.4 rad/s$

so the ratationa frequency is given by

$\omega = 2 \pi f$

$2.4 = 2 \pi f$

$f = \frac{2.4}{2\pi}$

$f = 0.38 Hz$

7 0

3 years ago

Is god real??? i wanna know

NemiM [27]

In my opinion, yes the bible tell us that "For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life"
So my answer is yes

6 0

3 years ago

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A person investing p at a certain rate of simpl interest after 1 2 and3 years it amounted to 1.5 p 2.5 p respectively what will

Ulleksa [173]

Answer: It will amount to 11p after 20 years.

Explanation:

Formula :

Simple interest = Principal x rate x Time (i)

Amount = Principal + Interest

Amount = Principal + Principal x rate x Time

Amount = Principal (1+ rate x Time) (ii)

Given: Principal = p

After 1 year , amount = 1.5p

After 3 years , amount = 2.5p

From (ii)

$1.5p = p (1+r)\\\\\Rightarrow\ 1.5=1+r\\\\\Rightarrow\ 0.5= r\\\\\Rightarrow r= 0.5$

Amount after 20 years = p(1+ 0.5 x 20) = p(1+10)=11p

It will amount to 11p after 20 years.

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3 years ago

A man with his eye level 6 feet above the ground is standing 3 feet away from the base of a 15-foot vertical ladder. If he looks

DochEvi [55]

Answer:

71.6°

Explanation:

According to the diagram

ED = 6 feet

DA = EB = 3 feet

AC = 15 feet

AB = ED = 6 feet

BC = AC - AB = 15 - 6 = 9 feet

Let the angle is θ from the horizontal

By the triangle EBC

tanθ = BC / EB = 9 / 3

tanθ = 3

θ = 71.6°

Thus, the angle from the horizontal is 71.6°.

Explanation:

7 0

4 years ago