167. assignment (pressure)
6. A child wants to pump up a bicycle tire so that its pressure is 1.2*10^5 Pa above that of atmospheric pressure. If the child uses a pump with a circular piston with a surface area equal to 9.6*10^-4 m^2 what force must the child exert?
A) 120N
B) 89 N
C) 76 N
D) 54 N
E) 240 N
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