A child inflates a balloon, admires it for a while and then lets the air out at a constant rate. If V(t) gives the volume of the balloon at time t, then the figure below shows V' (t) as a function of t. 2 V'(t) 6. 8 10 12 -4 (a) At what time does the child begin to inflate the balloon? The child begins to inflate the balloon at t = eTextbook and Media (b) At what time does the child finish inflating the balloon? The child finishes inflating the balloon at i = eTextbook and Media

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.