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3 years ago

What are your thoughts on Galileo's idea about motion? i need the answer pls

Chemistry

1 answer:

dalvyx [7]3 years ago

4 0

Answer:

Galileo believed that a projectile is a combination of uniform motion in the horizontal direction and uniformly accelerated motion in the vertical direction. If it is not impeded, it will continue to move even without an applied force

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A man heats a balloon in the oven. If the balloon initially has a volume of 0.4 liters and a temperature of 20 degrees celsius,

Airida [17]

Answer:

0.714 liter.

Explanation:

Given:

The balloon initially has a volume of 0.4 liters and a temperature of 20 degrees Celsius.

It is heated to a temperature of 250 degrees Celsius.

Question asked:

What will be the volume of the balloon after he heats it to a temperature of 250 degrees Celsius ?

Solution:

By using:

$PV=nRT$

Assuming pressure as constant,

V∝ T

Now, let K is the constant.

V = KT

Let initial volume of balloon , $V_{1}$ = 0.4 liter

1000 liter = 1 meter cube

1 liter = $\frac{1}{1000} m^{3} = 10^{-3} m^{3$

0.4 liter = $0.4\times10^{-3}=4\times10^{-4} m^{3}$

And initial temperature of balloon, $T_{1}$ = 20°C = (273 + 20)K

= 293 K

Let the final volume of balloon is $V_{2}$

And a given, final temperature of balloon, $T_{2}$ is 250°C = (273 + 250)K

= 523 K

Now, $V_{1}$ = $KT_{1}$

$4\times10^{-4}=K\times293\ (equation\ 1 )$

$V_{2}$ = $KT_{2}$

$=K\times523\ (equation 2)$

Dividing equation 1 and 2,

$\frac{4\times10^{-4}}{V_{2} } =\frac{K\times293}{K\times523}$

K cancelled by K.

By cross multiplication:

$293V_{2} =4\times10^{-4} \times523\\V_{2} =\frac{ 4\times10^{-4} \times523\\}{293} \\ = \frac{2092\times10^{-4}}{293} \\ =7.14\times10^{-4}m^{3}$

Now convert it into liter with the help of calculation done above.

$7.14\times10^{-4} \times1000\\7.14\times10^{-4} \times10^{3} \\0.714\ liter$

Therefore, the volume of the balloon be after he heats it to a temperature of 250 degrees Celsius is 0.714 liter.

5 0

3 years ago

The fluoride rinse in dental offices usually contains sodium fluoride. Sodium fluoride can be prepared from the reaction between

Bad White [126]

The chemical reaction in which number of atoms of each element present in the reactant side is equal to the number of atoms of that element in product side, such reactions are said to be a balanced chemical reaction.

The chemical symbol for sodium is $Na$ .

The chemical symbol for fluorine gas is $F_2$ .

The chemical symbol for sodium fluoride is $NaF$

The sodium fluoride is prepared from the reaction between sodium metal and fluorine gas can be written as:

$Na (s)+F_2(g) \rightarrow NaF(s)$

The above reaction is not balanced as the number of fluorine atoms are not same on reactant and product side. So, in order to balance the reaction we will multiply $Na$ with 2 on reactant side and $NaF$ with 2 on product side. Thus, the balanced reaction will be:

$2Na (s)+F_2 (g)\rightarrow 2NaF(s)$

Thus, the balanced chemical equation is $2Na (s)+F_2 (g)\rightarrow 2NaF(s)$ .

3 0

3 years ago

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Which is a combination of pollutants that mix with water vapor in a city or near large highways and factories?

Valentin [98]

Me mememememememememememememememememeememememeemememememememe

8 0

3 years ago

Why fluorine is more electronegative than both oxygen and chlorine.

ziro4ka [17]

Why chlorine has highest electron affinity than fluorine?

This is because the atomic radius increases down a group. The electron gained ends up in the outermost shell. ... Fluorine, which is higher up the group then chlorine, has a lower electron affinity. This is because the electrons in the outermost shell of a fluorine atom are closer together.

4 0

3 years ago

What molecule is responsible for chemical digestion.

padilas [110]

Answer:

Amylase.

Explanation:

The process of digestion begin to start in mouth when food mix with saliva. An enzyme is released which is called Amylase help in digestion of carbohydrates.

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3 years ago

What are your thoughts on Galileo's idea about motion? i need the answer pls​

What are your thoughts on Galileo's idea about motion? i need the answer pls