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 !
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.
84
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.
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.