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Mashcka [7]
4 years ago
10

PLEASE HELP!!!! Two science questions!!!! 20 points and brainliest!!!

Chemistry
1 answer:
Angelina_Jolie [31]4 years ago
8 0
<span>1. A cylinder is submerged in water as illustrated in the diagram. Which of the following statements is true?

</span><span>The pressure at D is greater than at B. This is because D is trying to get back to the surface with an amount of pressure. B has less amount of pressure.

</span><span>2. A cylinder is submerged in water as illustrated in the diagram. If the area of the top and the bottom of the cylinder is the same, which of the following statements is true?

</span><span>buoyant force = (force D - force A).

Edit: If you ever notice. When you fill a sink full of water. Put a glass upside down and try forcefully to submerge it under the water it will resist. This is because of the pressure and air. The glass is less dense then water. (Also depends on the glass)</span>
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A wave has 9.2 x 10^-22 j of energy. What is its wavelength?<br> Please help
puteri [66]

Answer:

2.2 × 10⁻⁴ m

Explanation:

Step 1: Given and required data

  • Energy of the wave (E): 9.2 × 10⁻²² J
  • Planck's constant (h): 6.63 × 10⁻³⁴ J.s
  • Speed of light (c): 3.00 × 10⁸ m/s

Step 2: Calculate the wavelength (λ) of the wave

We will use the following expression.

E = h × c/λ

λ = h × c/E

λ = 6.63 × 10⁻³⁴ J.s × 3.00 × 10⁸ m/s/9.2 × 10⁻²² J

λ = 2.2 × 10⁻⁴ m

7 0
3 years ago
Why are there so many substances?
kifflom [539]

Answer:

first conclusion was that the whole world is made up of only 4 elements but as the time passed more elements were discovered... if the world would not contain more elements... you wouldn't be alive.

3 0
3 years ago
If an ocean current is moving northward from Antarctica and up the coast of Africa, the climate of the coastal land would be....
Illusion [34]

Answer:

I would say a cooled

Explanation:

because yeah it's going to be cold when it travels from Antarctica but then it's going on towards Africa and yeah the water is going to get warmth but it's going to cool the land of Antarctica because it's so dry and hot and humid but the water is going to be more warmed because Antarctica the water is freezing so you're trying to ask the temperature of the water it'd be more warm if you're trying to ask kind of like the temperature of the land it would be cooled

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3 years ago
A physical change occur when a
Viefleur [7K]
The answer is C. Glue gun melts a glue stick.
5 0
4 years ago
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A 225 g sample of french fries supplies 460 kilocalories of energy. 65% of those calories come from fat, which supplies 9 kiloca
brilliants [131]
The french fries gives 460 kilocalories and <span>65% of those calories come from fat. Then, calorie that comes from fat would be: 65% * 460 kcal= 299 kcal

Fat gives </span>energy about 9kcal/gram. Then, the total mass of fat in the french fries would be: 299 kcal/ (9kcal/g)= 33.22 grams
3 0
4 years ago
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