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The floor limit of an aircraft cargo hold is 5 000 N/m2. It is planned to load-up a cubic container measuring 0.4 m of side. It's maximum gross mass must not exceed (assume g = 10 m/s2):
  • A
    320 kg
  • B
    32 kg
  • C
    800 kg
  • D
    80 kg

5 000 ÷ 1 m2 = M ÷ (0.4 x 0.4)
M = 5 000 x 0.16 = 800 N = 80 kg

The floor limit is 5000 N per 1 m2
The area of the container is 0,4 x 0,4 = 0,16
5000 N placed on an area of 1 m2 is the same as 800 N placed on an area of 0,16 m2
M = 5000 x 0,16 = 800 N = 80 kg

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