In a water pistol, a piston drives water through a larger tube of area A, into a smaller tube of area Az as shown in the figure below. The radius of the large tube is 1.30 cm and that of the small tube is 1.20 mm. The smaller tube is 3.00 cm above the larger tube. (a) If the pistol is fired horizontally at a height of 1.40 m, determine the time interval required for water to travel from the nozzle to the ground. Neglect air resistance and assume atmospheric pressure is 1.00 atm. 0.53465 (b) If the desired range of the stream is 7.80 m, with what speed v2 must the stream leave the nozzle? 14.59 v m/s (c) At what speed v, must the plunger be moved to achieve the desired range? 0.1243 v m/s (d) What is the pressure at the nozzle? Pa (e) Find the pressure needed in the larger tube. Pa (f) Calculate the force that must be exerted on the trigger to achieve the desired range. (The force that must be exerted is due to pressure over and above atmospheric pressure.) N

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!