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It is because if it was one big piece, the concrete would buckle and break just like bridges.

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Q: Why does a sidewalk have built in cracks every few feet?
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Sidewalks are built with cracks because in the summer something occurswhat is it?

they r called contraction joints. then every few of those then expansion joint. concrete is going to crack, so make it crack so it can't be seen,under the man made ones. concrete tends to crack symmetrically. so if ur sidewalk is 3 feet wide the contraction joints will be every 3 feet. then expansion joint, 3/4 inch with expansive material, every 4th one.


How many cubit feet in a four by twenty five feet sidewalk?

Impossible to answer - without knowing the depth of the sidewalk !


When you walk bearfoot across a hot sidewalk you feel heat on your feet. explain What is happening with the molecules in both the sidewalk and your feet and in which direction thermal energy is moving?

As you walk barefoot on a hot sidewalk, the sidewalk molecules vibrate more due to the heat, transferring thermal energy to your feet. The heat is moving from the sidewalk (higher temperature) to your feet (lower temperature), causing your feet to feel hot. The increased molecular vibrations in the sidewalk result in the sensation of heat on your feet as thermal energy is transferred.


A sidewalk borders a rectangle play area The play area measure 20 feet by 14 feet The width of the sidewalk is 2 ft What is the perimeter of the outside border of the sidewalk?

84


Why does a person move forward when he or she pushes on the sidewalk?

When a person pushes against the sidewalk, they exert a force in the opposite direction. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. This means the sidewalk exerts an equal and opposite force on the person, propelling them forward.


If you have 152 cubic yards of concrete you are building a sidewalk 6 feet wide by 6 high how many linear feet of sidewalk will you have?

152/(6*6) = 4.22... (recurring) feet.


Which explanation describes the forces involved for a person to walk down the sidewalk?

The person's feet push backward on the sidewalk; the sidewalk pushes forward on the person.


If a sidewalk is 3 feet wide and 184 feet long how many expansion joints are needed?

The answer will depend on what material the sidewalk is made from and the maximum range in temperature.


When heat is transferred from the sidewalk to your feet by what process?

conduction


How many feet before an expansion joint is installed in concrete sidewalk?

10 feet.


What is the average installation price of a concrete sidewalk per square foot?

Unanswerable - too little information on size of wall when finished - a wall 2 feet high would be built very differently to one 10 feet high.


How many square feet of a 4 inch sidewalk to a cubic yard of concrete?

81 Square feet.