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Leno4ka [110]
2 years ago
10

When 1kg of a substance changes from solid to liquid at its melting point, it must absorbed an amount of heat equal to which of

the following?
A. specific heat of phase changes
B. specific heat capacity
C. latent heat of fusion
D. latent heat of vaporization
Physics
1 answer:
quester [9]2 years ago
4 0
Answer is (c), the latent heat of fusion. That is by definition the heat that 1 kg of a substance must absorb to melt in the vicinity of its melting point.
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Answer:

v = √ 2 G M/ R_{e}

Explanation:

To find the escape velocity we can use the concept of mechanical energy, where the initial point is the surface of the earth and the end point is at the maximum distance from the projectile to the Earth.

Initial

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Final

        Em_{f} =  U_{f}

The kinetic energy is k = ½ m v²

The gravitational potential energy is U = - G m M / r

r is the distance measured from the center of the Earth

How energy is conserved

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       v = √ 2GM (1 / R_{e} – 1 / r)

The escape velocity is that necessary to take the rocket to an infinite distance (r = ∞), whereby 1 /∞ = 0

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5 0
3 years ago
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Explanation:

  • The applications are, hydraulic lift- to transmit equal pressure throughout a fluid.
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7 0
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Answer:

(A)

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Since the two charged particles are moving apart, the distance between them (r) increases and thus electrical potential energy decreases.

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Anon25 [30]

Answer:

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