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3 years ago

What kind of chemical reaction does the chemical equation sodium + chlorine sodium chloride represents

Physics

1 answer:

Pavlova-9 [17]3 years ago

5 0

It represents combustion.

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Richard is driving home to visit his parents. 135 mi of the trip are on the interstate highway where the speed limit is 65 mph .

Elis [28]

<h2>Answer:</h2>

He saves 13.2 minutes

<h2>Explanation:</h2>

Hey! The question is incomplete, but it can be found on the internet. The question is:

How many minutes did he save?

Let's call:

$t_{1}:Time \ at \ speed \ 65mph \\ \\ t_{2}:Time \ at \ speed \ 73mph \\ \\ v_{1}=65mph \\ \\ v_{2}=73mph$

We know that the 135 miles are on the interstate highway where the speed limit is 65 mph. From this, we can calculate the time it takes to drive on this highway. Assuming Richard maintains constant the speed:

$v=\frac{d}{t} \\ \\ d:distance \\ \\ t:time \\ \\ v:velocity \\ \\ t_{1}=\frac{d}{v_{1}} \\ \\ t=\frac{135}{65} \\ \\ t_{1}=2.07 \ hours$

Today he is running late and decides to take his chances by driving at 73 mph, so the new time it takes to take the trip is:

$t_{2}=\frac{135}{73} \\ \\ t_{2}=1.85 \ hours$

So he saves the time $t_{s}$ :

$t_{s}=t_{1}-t_{2}=2.07-1.85=0.22 \ hours$

In minutes:

$t_{s}=0.22h\left(\frac{60min}{1h}\right) \\ \\ \boxed{t_{s}=13.2min}$

5 0

3 years ago

The first law of thermodynamics states that E=Q-W. How is this also a statement of the principle of conservation of energy?

g100num [7]

This law demonstrates that the energy within a close system may be converted from one form to another, but it cannot be created nor destroyed.

4 0

3 years ago

What is population compostion<br>

Andrej [43]

Answer :

Population composition is the description of a,population according to characteristics such as age and sex . These data are often compared over time using population pyramids.

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3 years ago

Tides occur in ocean but not in lakes.why?

Sholpan [36]

Answer:

The Tides are caused by the gravitational pull of the moon and the sun .... Tides do occur in lakes they just aren't noticible.

Explanation:

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4 years ago

3. After studying about recycling, members of John’s biology class investigated the effects of various recycled products on plan

artcher [175]

A hypothesis is when a scientific method gets the same results

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4 years ago