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aliya0001 [1]
3 years ago
7

5) When a substance changes its state, all BUT ONE of these statements is true That is A) Mass remains constant B) Only the form

changes. 9 Kinetic energy changes. D) Something chemically new is formed ​
Physics
1 answer:
expeople1 [14]3 years ago
7 0
C) kinetic energy changes. Gas>liquid>solid
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Using a rope that will snap if the tension in it exceeds 356 N, you need to lower a bundle of old roofing material weighing 478
klasskru [66]

Answer:

a) 2.5 m/s²

b) 6.12 m/s

Explanation:

Tension of rope = T = 356N

Weight of material = W = 478 N

Distance from the ground = s = 7.5 m

Acceleration due to gravity = g = 9.81 m/s²

Mass of material = m = 478/9.81 = 48.72

Final velocity before the bundle hits the ground = v

Initial velocity = u = 0

Acceleration experienced by the material when being lowered = a

a) W-T = ma

⇒478-356 = 48.72×a

\Rightarrow \frac{122}{48.72} = a

⇒a = 2.5 m/s²

∴ Acceleration achieved by the material is 2.5 m/s²

b) v²-u² = 2as

⇒v²-0 = 2×2.5×7.5

⇒v² = 37.5

⇒v = 6.12 m/s

∴ Velocity of the material before hitting the ground is 6.12 m/s

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3 years ago
Where does salt in the ocean come from
Bingel [31]

Answer:

Salt in the ocean comes from two sources: runoff from the land and openings in the seafloor. Rocks on land are the major source of salts dissolved in seawater. Rainwater that falls on land is slightly acidic, so it erodes rocks.

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How do you break apart a
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B

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Depends Mostly on bonds electrolysis can be used, chemical bonding like additional of water or by heating back to their elements.

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2 years ago
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Juan compró un carro que dicen que es muy rápido. Cuándo lo probó recorrió una distancia de 4500m en tan solo 5 min. ¿Qué veloci
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Don't know sorry..................

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Organisms that live on or burrow into the ocean floor are
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Benthos 

Option b is the answer



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