To convert kPa to Pa, just multiply by 1000 - since the prefix "kilo" ("k") means "times 1000".
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If the object is a square with sides of 3cm then the area is 0.0009 square metres.We assume the pressure was measured on Earth's surface.Weight (Newtons) = Pressure*area = (21 N/m2)*0.0009 m2 = 0.0189 Newtons.
pa/b = (pa)1/b = bth root of (pa)
P = 5 A = 6 B = 11 Or.... P = 1 A = 30 B = 55
alpha = 'Alepa [ah-lay-pa]
75 x 7 x 2 = 1050