physics

posted by .

Concrete highway slabs are poured in lengths of 9.00m .

Part A
How wide should the expansion gaps between the slabs be at a temperature of 22∘C to ensure that there will be no contact between adjacent slabs over a temperature range of -25 ∘C to 48∘C?

  • physics -

    α=12•10⁻⁶ K⁻¹
    T₁=22° T₂=-28°, T₃= 48°
    ΔT₁ = T₃-T₂ = 48-(-25) = 73°
    ΔT₂ =48-22 = 26°
    ΔL₁=L αΔT₁=9•12•10⁻⁶•73=0.0079 m
    If the slabs are in contact at 48° =>
    they are at 0.0079 mm at -25°
    ΔL₂=L αΔT₂ = 9•12•10⁻⁶•26=0.0028 m
    ΔL= ΔL₁-ΔL₂=
    =0.0079-0.0028=0.0051 m=5.1 mm (at 22°)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    A 56 kg rock climber is climbing a "chimney" between two rock slabs as shown in the figure. The static coefficient of friction between her shoes and the rock is 1.02; between her back and the rock it is 0.70. She has reduced her push …
  2. physical

    A highway of concrete slabs is to be built in the Libyan desert, where the highest air temperature recorded is 57.8 °C. The temperature is 23.1 °C during construction of the highway. The slabs are measured to be 11.7 m long at this …
  3. physics

    two slabs of thickness 10cm and 2ocm are made of rteel and copper respectively.they are in thermal contact with each oth.the far end of the steel is at 100 degrees celcius amd that of copper is at 0 degrees celcius.determine the temperature …
  4. physics

    two slabs of thickness 10cm and 2ocm are made of rteel and copper respectively.they are in thermal contact with each oth.the far end of the steel is at 100 degrees celcius amd that of copper is at 0 degrees celcius.determine the temperature …
  5. physics

    two slabs of thickness 10cm and 2ocm are made of rteel and copper respectively.they are in thermal contact with each oth.the far end of the steel is at 100 degrees celcius amd that of copper is at 0 degrees celcius.determine the temperature …
  6. physics

    Concrete sidewalks are always laid in sections, with gaps between each section. For example, the drawing shows three identical 2.4-m sections, the outer two of which are against immovable walls. The two identical gaps between the sections …
  7. physics

    A highway is made of concrete slabs that are 14.0 m long at 20° C. (a) If the temperature range at the location of the highway is from -17.8° C to +40.8° C, what size expansion gap should be left (at 20° C) to prevent buckling …
  8. language arts

    Avalanches happen in a series of stages. First, while the temperature is cold and there is a heavy snowfall, the snow will stick to the ground. Suppose that what happens next is that the air temperature changes after the snow has fallen. …
  9. Physics

    A concrete sidewalk is constructed between two buildings on a day when the temperature is 25 0C. The sidewalk is 6 m long and consists of two slabs each 3 m in length and of negligible thickness. What would be amount of buckling (displacement) …
  10. Language Arts

    Passage A Avalanches are caused by a variety of conditions. When the temperature is cold and snow falls, the snow sticks to the ground. However, when the air temperature changes, the snow may slide away in pieces or slabs. Basically …

More Similar Questions