3 years ago

How is velocity determined from a distance over time graph

Physics

1 answer:

Elden [556K]3 years ago

7 0

Answer:

The slope of a distance vs time graph represents velocity.

Explanation:

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a/ Compute the quantity of heat released by 25.0 g of steam initially at 100.0oC, when it is cooled to 34.0°C and by 25.0 g of w

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When put into steam

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When a certain amount of steam at boiling temperature condenses (turning into water), the amount of heat released is

$Q_1 = m\lambda_v$

where in this case

m = 25.0 g = 0.025 kg is the mass of steam at 100.0°C

$\lambda_v=2.256\cdot 10^6 J/kg$ is the latent heat of vaporization of water

So,

$Q_1=(0.025)(2.256\cdot 10^6)=56400 J$

Instead, the amount of heat released when the water at 100.0°C is cooled down to 34.0°C is given by

$Q_2=mC\Delta T$

where

m = 25.0 g = 0.025 kg is the mass of water

$C=4.19\cdot 10^4 J/kg K$ is the specific heat of water

$\Delta T=100-34=66^{\circ}C$ is the change in temperature

Therefore,

$Q_2=(0.025)(4.19\cdot 10^3)(66)=6913 J$

Since $Q_1>Q_2$ , we can say that your hand will burn more in the first case.

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