1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
pychu [463]
3 years ago
5

Why do most sidewalks have cracks in them every few feet?

Chemistry
2 answers:
Licemer1 [7]3 years ago
8 0
This is actually a really good question! The lines are actually called "contraction joints." When the sidewalk is being made, the concrete used shrinks as it dries. This shrinking can cause cracks to form in the sidewalk, so to prevent the cracks from forming randomly, the builders make thin lines. Any cracks that form should follow the path of the line, since this is where the concrete is thinnest.

Hope this helps! :)
Elodia [21]3 years ago
7 0
It's because of the landscape, it changes over time.
You might be interested in
What did early scientists assume that the polar caps had in common?
Vilka [71]

Answer:

They assumed they both had water.

Explanation:

Because they only could look at it through telescopes that were not advanced

3 0
2 years ago
Which of the following represents positron emission? Select one: a. 3015P ---> 3014Si + ___ b. 23892U ---> 23490Th + ___ c
xxTIMURxx [149]
The simple trick which one can consider in such problem where it is asked for positron emission is :
<span>When the atomic number goes DOWN by one and mass number remains unchanged, then a positron is emitted.
</span>
<span>a.  </span>P^{30}_{15}  ----\ \textgreater \   Si^{30}_{14} + e^{0}_{1}^+
<span>
Here the atomic number decreases by one.

Similarly, options b and d are eliminated.

Option c is also not the answer.
For c, Count the atomic number on left side and compare it with right side. You will see it is 9 on left and 8 on right. Atomic no. did go down by 1. But the atomic mass is changed as well.

</span>
8 0
3 years ago
Which of the data sets qualitative data?
Kaylis [27]

Answer:

Uh, the second one?

Explanation:

Try to restate the question please.

3 0
2 years ago
Read 2 more answers
Which state of matter is charcterized with no volume?
ziro4ka [17]

The answer is GAS. Gas has a physical state characterized by having no definite volume or shape and consisting of neutral particles. or it can also be plasma.



7 0
3 years ago
Which formula is a molecular compound?<br><br> H2O2<br> CaO<br> MgS<br> NaCl
Alborosie

Answer:

H2O2

Explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • Anyone know what the answer is?
    7·2 answers
  • An aqueous solution of calcium hydroxide is electrolysed using carbon electrodes.
    15·2 answers
  • How many grams of AgNO3 are needed to make 250 ml of a solution that is 0.135 M
    10·1 answer
  • The reaction for the formation of gaseous hydrogen fluoride (HF) from molecular hydrogen (H2) and fluorine (F2) has an equilibri
    15·1 answer
  • In a closed system containing three different gases as shown, X2 + Y2 2XY. Choose the TWO things that MUST happen as the volume
    9·1 answer
  • Triangles in an octagon​
    13·1 answer
  • What is the chemical name of the compound Cu(NO3)2? Use the list of polyatomic ions and the periodic table to help you answer.
    8·1 answer
  • What type of reaction is: 4 Fe + 3 O2 → 2 Fe2O3
    8·1 answer
  • GUYS !! So i have a science fair project &amp;&amp; we get to pick what we wanna do but i need help , should i do Crystallizatio
    5·2 answers
  • Using complete sentences, explain how to predict the products and balance the reaction for the combustion of butane.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!