A piston above a liquid in a closed container has an area of 1m2. The piston carries a load of 350 kg. What will be the external pressure on the upper surface of the liquid? A. 4.90 kPa B. 27.3 kPa C. 68.6 kPa D. 3.43 kPa
Answers
Explanation :
It is given that,
Area of the container,
Load carried by piston, m = 350 kg
Pressure on the upper surface of the liquid is defined as the force acting per unit area.
Mathematically it can be written as :
From Newton's second law of motion :
F = m a
So,
P = 3430 Pa ( Pa = pascal)
or
P = 3.43 kPa
So, the correct option is (D)
Hence, this is the required solution.
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300° Celsius
400° Celsius
Answers
Boiling point is at 200° Celsius
Explanation:
Matter exists in three states:
- Solid state: the molecules of the element are fixed in their place and strongly bonded to each other - therefore, they can only vibrate around their fixed position.
- Liquid state: the molecules of the element are free to slide past each other - however, there are still intermolecular forces that keep them close to each other
Gas state: the molecules of the element are completely free to move far from each other
Evaporation is the process that occurs when a substance changes from liquid to gas state. This process occurs when the temperature of the substance reaches its boiling point.
In the graph given in this problem (find it in attachment), we observe that:
- At first, the temperature increases up to 50 Celsius; this is the solid state
- Then the temperature stops increasing --> this is the transition of phase from solid to liquid (melting), which occurs at a constant temperature of 50 Celsius (melting point)
- Then, the temperature increases again up to 200 Celsius (liquid state)
- Then the temperature stops increasing again --> this is the transition of phase from liquid to gas (evaporation), which occurs at a constant temperature of 200 Celsius, which is therefore the boiling point
- Then, the temperature increases again (gas state)
Therefore, the boiling point of the substance in this problem is
200° Celsius
Learn more about temperature:
#LearnwithBrainly
Answer:
B
Explanation:
200 degrees Celcius.