Help me on question 4 pls I’m giving out brainlest!!

Answer:

(a) (i) 1) The mass of the water is 1.8 × 10⁹ kg

2) The gravitational potential energy is 6.174 × 10¹² J

4) The energy given to the turbine by the falling water is 6.174 × 10¹² J

5) The maximum possible average output power is 245 MW

Explanation:

In the question we are required to convert the total initial potential energy, P.E., of the water to power

The given parameters are;

The height of the reservoir above the turbine, h = 350 m

The time duration the volume of water takes to flow, t= 7.0 hours

The volume of water that flows down from the reservoir, V = 1.8 × 10⁶ m³

The density of the water, ρ = 1000 kg/m³

(a) (i) Density = Mass/Volume

∴ Mass = Density × Volume

The mass of the water that flows down from the reservoir = m = V × ρ

By substituting the known values, we have

The mass of the water, m = 1.8 × 10⁶ m³ × 1000 kg/m³ = 1.8 × 10⁹ kg

2) The gravitational potential energy, P.E. = m × g × h

where;

m = The mass of the water = 1.8 × 10⁹ kg

g = The acceleration due to gravity = 9.8 m/s²

h = The height from which the water falls = 350 m

Which gives;

The gravitational potential energy,

P.E. = 1.8 × 10⁹ kg × 9.8 m/s² × 350 m = 6.174 × 10¹² J

The gravitational potential energy = 6.174 × 10¹² J

4) The energy given to the turbine by the falling water, E = The gravitational potential energy = 6.174 × 10¹² J

5) The maximum possible average output power, P = (Energy given to the turbine, E)/(Time taken to produce the energy = The time duration the water takes to flow, t)

The time duration the water takes to flow, t = 7.0 hours = 7 × 60 × 60 seconds =  25,200 seconds

∴ P = 6.174 × 10¹² J/(25,200 s) = 245,000,000 watts = 245 MW

Answer: [tex]25.08\ m/s^2[/tex]

Explanation:

Given

mass of wagon m=5 kg

elevation

[tex]\theta =30.9^{\circ}\\F=150\ N[/tex]

Sin component of weight will oppose the applied force therefore we can write

[tex]F-W\sin \theta=ma\\where\\W=weight(mg)\\a=acceleration[/tex]

[tex]150-5\times 9.8\times \sin (30.09)^{\circ}=5\times a\\125.43=5a\\a=25.08\ m/s^2[/tex]

An LED light bulb is favoured because it is more bright.

An LED light is favored over an incandescent light bulb because it is more bright than the incandescent bulb.

An LED is a light emitting diode. It is used widely for the production of light because it shows some advantages which include:

Many traditional lighting systems like the incandescent bulbs turn more than 90% of the energy which they use to heat, allocating only about  10% of energy to actual light production. LEDs emit almost no heat energy, and most of the light energy they emit is within the visible spectrum.

LEDs use much less energy than that of incandescent bulbs because the diode light is much more efficient, power-wise, than the filament light. LED bulbs use more than 75% less energy than those of incandescent lighting.

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Answer:

unperscriebed drugs can e harmful to your body

Explanation:

Answer:

4.00 × 1012 hertz

Explanation:

Answer:

Explanation:

a. From the information provided in the question, the blue liquid is a solution. This is because a solution is a type of homogeneous mixture (that has an evenly distributed solute in a solvent) which is the reason the liquid was said to be blue (and not immiscible blue solid in a liquid) but after been exposed to heat became just a blue solid. Typically, a solution has a solute and a solvent (combined), the solute here is the blue solid while the solvent is the liquid that made the combination a liquid.

b. Since the dish containing the liquid was placed on a windowsill, it can be assumed that the dish was subjected to heat from the sun which caused the liquid (in the solution) to evaporate after exposure to the heat from the sun (over the weekend) leaving the blue solid solute (of the solution) to remain in the dish. This can be referred to as evaporation to dryness in separation techniques (if the goal was to intentionally separate the solid solute from the liquid solvent).

Answer:

concave mirror

Explanation:

Answer:

In DNA, the pyrimidines are thymine and cytosine; the purines are adenine and guanine. Both strands of double-stranded DNA store the same biological ...

Explanation:

hope it helps

Answer:

..

Charcoal is flammable.

Answer:

i think a

Explanation:

Shuffling your feet across the floor as you walk is an example of charging by friction. The correct option is A.

The force preventing sliding against one another of solid surfaces, fluid layers, and material components is known as friction.

There are various kinds of friction: Two solid surfaces in touch are opposed to one another's relative lateral motion by dry friction.

Frictional force is the force produced when two surfaces slide against and touch each other.

The surface texture and amount of force needing them together have the biggest an impact on these forces. The amount of frictional force is influenced by the object's position and angle.

As an illustration of how charge is transferred via friction, consider walking over a carpet.

Thus, the correct option is A.

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Answer:

[tex]F=1.06\times 10^{-18}\ N[/tex]

Explanation:

Given that,

Mass of the Moon, [tex]M=7.34\times 10^2\ kg[/tex]

Mass of the person, m = 66 kg

The radius of Moon, [tex]r=1.74\times 10^6\ m[/tex]

We need to find the force between the person and the Moon. The formula for the gravitational force is given by :

[tex]F=G\dfrac{Mm}{r^2}\\\\F=6.67\times 10^{-11}\times \dfrac{7.34\times 10^2\times 66}{(1.74\times 10^6)^2}\\\\=1.06\times 10^{-18}\ N[/tex]

So, the required force is [tex]1.06\times 10^{-18}\ N[/tex].

Unit to measure red blood cell is million per cubic millimeter

A red blood cell, also called a hematopoietic cell, hemocyte, is a cell produced through hematopoiesis and found mainly in the blood

Unit to measure red blood cell is million per cubic millimeter

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Answer:

Hi! It's B - liquid to a gas.

Answer:

V=u + at

V= final velocity

U= Initial velocity

a= acceleration

t= time taken

V= 5 + 30*2

V=5+60

V=65m/s

Explanation:

Answer:

They are reflected.

Explanation:

Red light is absorbed while green light is reflected, causing the color to be green in human eyes.

Answer:

C

Explanation:

Explanation:

acceleration is the Changing of throut per unit time ....

and in uniform motion .....

in that the speed of an object is uniform means same

Answer:  TRUE

Explanation:

(Example): If there was lightening outside, the lightening (light) could travel through a tree (that you cannot see through).

The statement Light can travel through materials that you cannot see through, like wood or aluminum foil, is True.

Electromagnetic radiation that the human eye can detect as light. The wavelengths of electromagnetic radiation cover a very broad spectrum. Information about space and time is transmitted by light. This characteristic serves as the foundation for the study of optics, optical communications, and a wide range of other related, both established and developing technologies.

Lasers, holography, and fiber-optic communication systems are examples of technologies that use light manipulation. The electromagnetic spectrum, which includes all forms of light, propagates in a vacuum at the same speeds, c. only a small portion of which is visible to humans. And it is unquestionably possible for non-visible light to pass through wood, including radio waves, x-rays, and gamma-energy photons.

Therefore, the statement Light can travel through materials that you cannot see through, like wood or aluminum foil, is True.

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Answer:

well they make the siren go beacaus eyou are doing somthing wrong so what were you thinking

Explanation:

Answer:

it looks like B on the first one and D on the second hope this helps!!

Explanation:

Explanation:

Opposite side from the 41° angle = 15.24m

We wish to find the adjacent side (horizontal length)

Therefore 15.24m / tan41° = 17.53m.

Answer:

asfsdfasasfsda

Explanation:

Answer:

IDEK HOW TO SOLVE

Explanation:

Answer:

8=3×1019 electrons per second.

Explanation:

Answer:

here

Explanation:8=3×1019 electrons per second.

Answer:

I believe it is A.c

Explanation:

hope its right

Answer:

the correct answer is A with a line on top

Explanation:

I just did the quiz

Answer:

10 N

Explanation:

Force = Mass÷Acceleration

F= 50 ÷ 5

= 10 N

______________________

Acceleration =

[tex] \frac{5 - 25}{4 } [/tex]

= 5m/s2

Given:

As we know,

The acceleration will be:

= [tex]\frac{5-25}{4}[/tex]

= [tex]5 \ m/s^2[/tex]

hence,

The force will be:

→ [tex]F = \frac{m}{a}[/tex]

By substituting the values, we get

      [tex]= \frac{50}{5}[/tex]

      [tex]= 10 \ N[/tex]

Thus the above response is right.  

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Answer:

an object traveling 80 meters in 2 sec. is 160

Answer: I'm like 98% sure it's fluorescent cause it's got mercury

Explanation:

Answer:

False

Explanation:

Answer:

Tension = 2.5 N

Explanation:

Given:

Angle = 60°

Force f = 5 N

Find:

Tension

Computation:

Tension = fcosθ

Tension = (5)cos60

Tension = (5)(1/2)

Tension = 2.5 N

Answer:

p=w/t

160/8=20

80/4=20

180/9=20

...so..all these uses equal power