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The answer will depend on what material the sidewalk is made from and the maximum range in temperature.
81 Square feet.
A 2-foot border around a 20 x 14 area makes the area 24 x 18 making the perimeter 84 feet.
10 miles = 52,800 feet, thus there are 52,800 x 15 = 792,000 ft2 of sidewalk (or pavement)
If there's a two foot border around a 14 x 20 foot area, that makes it 18 x 24 feet, with a perimeter of 84 feet.
It is because if it was one big piece, the concrete would buckle and break just like bridges.
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.
Impossible to answer - without knowing the depth of the sidewalk !
The person's feet push backward on the sidewalk; the sidewalk pushes forward on the person.
84
152/(6*6) = 4.22... (recurring) feet.
The person's feet push backward on the sidewalk; the sidewalk pushes forward on the person.
The answer will depend on what material the sidewalk is made from and the maximum range in temperature.
conduction
10 feet.
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.
frictional force