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kenny6666 [7]
3 years ago
9

When you ride a bicycle,when is friction helpful and not helpful

Chemistry
2 answers:
Alex Ar [27]3 years ago
8 0

Friction is helpful when riding on dirt or cement but it isn't when in rain or mud.
deff fn [24]3 years ago
3 0
It is helpful because it has reaction with road
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A change in state is a physical change.<br><br>True or false​
Morgarella [4.7K]

Answer: Depending on the state of change it can be a physical change. Example: Evaporation is the physical change of a liquid turned into a gas.

That said, I'm pretty sure the answer is (True)

Note: Hope this is correct and it helps. Good luck :)

5 0
3 years ago
a man bought two watches for Rs 2500 each.He sold one of them at 10% . profit and the other at 4% loss.what was his gain or loss
timofeeve [1]

Answer:

Selling price of watch A and watch B= Rs. 425

Let cost price of watch A=x

Profit =10%

∴

100

110

x=425

x=386.36

Let cost price of watch B=y

Loss =10%

∴

100

90

y=425

y=472.22

Net cost price =x+y=858.5858

Net selling price =850

Loss%=

858.58

858.5858−850

×100=1%

Explanation:

please mark me as the brainliest answer and please please pleaseeee follow me for more answers to your questions

5 0
4 years ago
Give the percent yield when 28.16 g CO2 are formed from the reaction of 8.000 moles of C8H18 with 4.000 moles of O2.
HACTEHA [7]

<span>The correct answer between all the choices given is the 4th choice or letter D. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.</span>

4 0
3 years ago
A canister of neon contains 4.8x1024 atoms of the gas. How many moles of neon are present in the canister?
algol [13]

Answer:

7.97 moles of neon are present in the canister.

Explanation:

Avogadro's constant or "Avogadro's number" is the number of constituent particles found in the amount of substance in one mole.

In other words, Avogadro's number is the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.

So, you can apply the following rule of three: if 6.023*10²³ atoms are present in 1 mole, 4.8*10²⁴ atoms are present in how many moles?

amount of moles=\frac{4.8*10^{24}atoms*1 mole }{6.023*10^{23}atoms}

amount of moles= 7.97 moles

<u><em>7.97 moles of neon are present in the canister.</em></u>

4 0
3 years ago
Which of the following is a renewable source of energy?
Pani-rosa [81]

Answer: D

Explanation:

Hydropower

5 0
3 years ago
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