What is latent heat of fusion ...

2 answers:

8 0

The enthalpy of fusion also known as (latent) heat of fusion is the change in enthalpy resulting from heating a given quantity of a substance to change its state from a solid to a liquid. The temperature at which this occurs is the melting point.

Andrej [43]3 years ago

7 0

The latent heat required for a solid to melt into liquid is called the Latent of Fusion.
This latent heat does not increase the kinetic energy of the substance undergoing a state change and thus doesn't show its presence by increasing temperature.

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The membrane that surrounds a certain type of living cell has a surface area of 5.3 x 10-9 m2 and a thickness of 1.1 x 10-8 m. A

kotykmax [81]

Answer:

$2.1\times 10^{-12} c$

Explanation:

We are given that

Surface area of membrane= $5.3\times 10^{-9} m^2$

Thickness of membrane= $1.1\times 10^{-8} m$

Assume that membrane behave like a parallel plate capacitor.

Dielectric constant=5.9

Potential difference between surfaces=85.9 mV

We have to find the charge resides on the outer surface of membrane.

Capacitance between parallel plate capacitor is given by

$C=\frac{k\epsilon_0 A}{d}$

Substitute the values then we get

Capacitance between parallel plate capacitor= $\frac{5.9\times 8.85\times 10^{-12}\times 5.3\times 10^{-9}}{1.1\times 10^{-8}}$

$C=0.25\times 10^{-12}F$

V= $85.9 mV=85.9\times 10^{-3}$

$Q=CV$

$Q=0.25\times 10^{-12}\times 85.9\times 10^{3}=2.1\times 10^{-12} c$

Hence, the charge resides on the outer surface= $2.1\times 10^{-12} c$

5 0

3 years ago

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8 Grade Science <br>Explain how a Lava lamp demonstrates convection currents.

Greeley [361]

Answer:

As a substance gains heat energy (in the case of the lava lamp, heat is transferred from the hot light bulb to the lava), it becomes less dense than the surrounding liquid ), causing the substance to rise.

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4 years ago

A ball of mass 2kg falls from a height of 200m. Calculate it's kinetic energy after falling a distance of 50m . (g=10m/s²) . Neg

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Answer:

U = 1000 J

Explanation:

By the conservation of energy, potential energy is converted into kinetic energy when the ball falls from a height.

$U = \frac{1}{2} mv^2 = mgh$