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makvit [3.9K]
3 years ago
13

Phase change occurs in which of the following A. A suspension. B boiling point. C An explosion D Mixing Point

Physics
2 answers:
QveST [7]3 years ago
5 0

Answer:

B. Boiling point

Explanation:

Boiling water: A phase change occurs when water boils.

The three common phases are solid, liquid, and gas. A phase change happens when one phase changes into different phase without a change in chemical composition.

When water boils, the liquid phase becomes a gas (water vapor or steam). The chemical composition of water does not change while boiling because each phase consists of water.

Thus, boiling water is the phenomena of a phase change.

Therefore there will be a phase change at boiling point.

Inessa05 [86]3 years ago
4 0
C I think not totally sure
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A 30.0 kg box hangs from a rope. What is the tension (in N) in the rope if the box has an initial velocity of 2.0 m/s and is slo
hjlf

Answer:

360 N

Explanation:

m = 30kg    u = 2 m/s     a = -2m/s/s

Since the object has an initial velocity of 2 m/s and acceleration of -2 m/s/s

the object will come to rest in 1 second but the force applied in that one second can be calculated by:

F = ma

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F = -60 N (the negative sign tells us that the force is acting downwards)

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F = ma

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F = -300 N (the negative sign tells us that the force is acting downwards)

Now, calculating the total downward force:

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<em></em>

<em>Hence, a downward force of 360 N is being applied on the box and since the box did not disconnect from the rope, the rope applied the same amount of force in the opposite direction</em>

Therefore tension on the force = <u>360 N</u>

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