PHYSICS HIGH SCHOOL

How is 1 hectoliter different from 1 kiloliter?

Answers

Answer 1
Answer:

For this case the main unit is liter.

The first thing you should know is that the liter is a unit of volume.

The difference then between hectoliter and kiloliter is the conversion factor.

For hectoliter we have:

1 hectoliter = 100 liters

For kiloliter we have:

1 kiloliter = 1000 liters

Answer:

The difference between both is the conversion factor:

1 hectoliter = 100 liters

1 kiloliter = 1000 liters
Answer 2
Answer: a kiloliter is smaller than hectoliter

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If a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°C, what will be the volume at 50°C? A. 0.002010812m3
B. 0.004021624m3
C. 0.002021624m3
D. 0.000010812m3

Answers

As per the question the volume of mercury  is given as 0.002 m^3 at 20 degree Celsius.

We are asked to calculate the volume of the mercury at 50 degree Celsius.

This problem is based on thermal expansion of matter.

Let us consider the initial and final volume of the mercury is denoted as -

                                  v_(1) \ and\ v_(2)

Let the initial and final temperature of the mercury is denoted as -

                                                                    T_(1)\ and \ T_(2)

As per question

v_(1) =0.002 m^3                v_(2) =?

T_(1) =20^0 C                      T_(2) =50^0 C

The change in temperature is

                                             T_(2) -T_(1)

                                         = 50^0 C -20^0 C

                                               = 30^0 C

Mercury is a fluid.So we have to apply volume expansion of liquid .

The coefficient of of volume expansion of mercury [ \gamma ] at 20 degree Celsius is 0.00018 per centigrade.

As per volume expansion of liquid,

                                       V_(T) = v_(1) [1 +\gamma [T_(2) -T_(1) ]]

Here V_(T) is the volume at T degree Celsius.

Hence volume at 50 degree Celsius is calculated as-

                               v_(2) =v_(1) [1+\gamma[50-30]]

                                       = 0.002[1+0.00018*30]

                                       =0.0020108m^3  [ans]

As per the options given in the question ,option A is close to the calculated value. So option A is right.
The answer to this question lies in understanding the Combined Gas Law in chemistry, which combines Boyle's, Charles', and Gay-Lussac's gas laws. This law shows the relationship between pressure, volume, and temperature of gases and is represented by the equation P1V1/T1 = P2V2/T2. Changes in pressure (P) and volume (V) are directly proportional to one another, but these are inversely proportional to changes in temperature (T). This question must assume that pressure is constant, so the Ps cancel out and the equation becomes V1/T1 = V2/T2. Additionally, temperature should be converted to Kelvins (K) by adding 273 to the temperature in Celsius (so 20 C = 293 K, and 50 C = 323 K). If V1 = 0.002 and T1 = 293 and T2 = 323, then we solve the equation as V2 = T2*V1/T1 or V2 = (323*0.002)/293, so the answer is approximately equal to 0.0022... or answer (C).

Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work?Move the machine to a different gravitational field.

Increase the friction between its moving parts.

Reduce the friction between its moving parts.

Redefine the machine’s system boundaries.

Answers

Based on the law of conservation of energy, we know that we can't create energy, machines can only convert one type of energy into another. So, if we want to improve a machines ability then we need to reduce it's loss energy (part of energy which is useless).

What is the law of conservation of energy ?

"The law of conservation of energy states that the amount of energy is neither created nor destroyed. For example, when you roll a toy car down a ramp and it hits a wall, the energy is transferred from kinetic energy to potential energy."

What is energy ?

"Energy is defined as the “ability to do work, which is the ability to exert a force causing displacement of an object.” Energy is just the force that causes things to move. Energy is divided into two types: potential and kinetic.

Know more about energy here

brainly.com/question/1932868

#SPJ3
Based on the law of conservation of energy, we know that we can't create energy, machines can only convert one type of energy into another. So, if we want to improve a machines's ability then we need to reduce it's loss energy (part of energy which is useless). Out of all the options only Option C fits best with it.

In short, Your Answer would be Option C

Hope this helps!

True of false efficiency compared the output work to the output force

Answers

The statement about "efficiency compared the output work to the output force" is false. Efficiency can be compared from the input work to the output work.

A(n) _____ is the smallest complete part of a compound.A. ion
B. atom
C. element
D. molecule

Answers

The answer to this is: a molecule
A molecule is the smallest complete part of a compound.  I think the answer is D. Molecule

The big bang theory is one of the most accepted theories on the origin of the universe because of scientific evidence, such as _____.

Answers

Answer:

Movement of Galaxies away from us.

Explanation:

Big Bang theory is the most widely accepted theory which says that the universe started with a huge expansion, it was not an explosion. By that logic everything must be moving from each other even today. This was proved by observing the Redshift in the spectrum of the galaxies which means that they are moving away from us.
The big bang theory is one of the most accepted theories on the origin of the universe because of scientific evidence, such as d: distant, exploding quasars were found  

Please help with the magnitude and Dir’n

Answers

the answer is given in the picture pasted

Hopefully it Helps.

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