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 Form 1 Physics Questions and Answers on Pressure

A sucker stuck on a flat surface was pulled by means of a spring balance as shown in figure below.
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When the sucker was just about to be pulled off the surface, the spring balance reading was 40 N. Given that the area of the sucker was 4.4 cm^2 , determine the air pressure in #Nm^-2#.

 (1m 41s)
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