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2 years ago

When a liquid is cooled, the kinetic energy of the particles ?

Physics

1 answer:

vodka [1.7K]2 years ago

4 0

When a liquid is cooled, the kinetic energy of the particles, DECREASES..

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We are going to make an imaginary engine using water. We are going to heat 100 grams of water to 120 C from its initial temperat

Svetach [21]

Answer:

The work done by this engine is 800 cal

Explanation:

Given:

100 g of water

120°C final temperature

22°C initial temperature

30°C is the temperature of condensed steam

Cw = specific heat of water = 1 cal/g °C

Cg = specific heat of steam = 0.48 cal/g °C

Lw = latent heat of vaporization = 540 cal/g

Question: How much work can be done using this engine, W = ?

First, you need to calculate the heat that it is necessary to change water to steam:

$Q_{1} =m_{w} C_{w} (100-22)+m_{w}L_{w}+m_{w}C_{g}(120-100)$

Here, mw is the mass of water

$Q_{1} =(100*1*78)+(100*540)+(100*0.48*20)=62760cal$

Now, you need to calculate the heat released by the steam:

$Q_{2} =m_{w}C_{g}(120-100)+m_{w}L_{w}+m_{w}C_{w}(100-30)=(100*0.48*20)+(100*540)+(100*1*70)=61960cal$

The work done by this engine is the difference between both heats:

$W=Q_{1}-Q_{2}=62760-61960=800cal$

8 0

3 years ago

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the wat

myrzilka [38]

The stone will take 2.89 seconds to hit the water.

The time required by the stone to hit the water is calculated by the second equaiton of motion

s=ut+ $\frac{1}{2}$ gt^2

41=0×t+ $\frac{1}{2}$ ×9.81×t²

t=2.89 seconds

8 0

3 years ago

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Speed of a car is 30 m/s. Find its speed in km/h.

katovenus [111]

Answer:

108km/h

Explanation:

1km=1000m

3600s=1 hr

M/s= 3600/1000km/hr= 3.6km/hr

30m/s= 30×3.6km/hr = 108km/hr

4 0

3 years ago

If a spacecraft is pushed by a thruster, what will happen

ElenaW [278]

D.

This is an accordance with Newton's First Law of Motion, stating that objects in motion remain in motion and objects at rest remain at rest unless acted upon by an external force.

8 0

3 years ago

If a hypothesis is.......

Varvara68 [4.7K]

Answer:

a correct

Explanation:

a hypothesis is a supposition made of a basis of limited evidence

7 0

3 years ago

Read 2 more answers