Answer:
See below
Step-by-step explanation:
Here is the first one..... the other two are similar
12 cm^2 = .0012 m^2
10 kg: 10 kg * 9.8 m/s^2 = 98 N
Pressure = 98 N / .0012 m^2 = 81 666.7 pascals = 81.7 kPascal
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