A rectangular building with sides 50 m and 100 m long has a flat roof on...

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A rectangular building with sides 50 m and 100 m long has a flat roof on top of it. The roof has a mass per unit area of 100 kg m-2. The walls are 10 cm thick and can take a maximum stress of Smax which depends on the material of the wall. The values of Smax for five building materials are: moist wood: Smar = 25.5 Nmm-² dry wood: Smax = 48.3 N mm-2 concrete: Smax = 300 N mm-² solid cardboard: Smaz 15 N mm-² = brick: Smar7Nmm-² Which materials could be used so that the walls will support the building, assuming that the mass of the walls is negligible? A B only concrete only brick C any of the ma- terials above D concrete or dry wood E concrete, dry or moist wood [2] A rectangular building with sides 50 m and 100 m long has a flat roof on top of it. The roof has a mass per unit area of 100 kg m-2. The walls are 10 cm thick and can take a maximum stress of Smax which depends on the material of the wall. The values of Smax for five building materials are: moist wood: Smar = 25.5 Nmm-² dry wood: Smax = 48.3 N mm-2 concrete: Smax = 300 N mm-² solid cardboard: Smaz 15 N mm-² = brick: Smar7Nmm-² Which materials could be used so that the walls will support the building, assuming that the mass of the walls is negligible? A B only concrete only brick C any of the ma- terials above D concrete or dry wood E concrete, dry or moist wood [2]

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