Mr. h ignites the enthusiasm of the class with a home-made cannon demonstration. the 1.27-kg cannon is loaded with a 54-gram tennis ball and placed on the floor. mr. h adds the fuel, waits for its vapors to fill the reaction chamber and then brings a match nearby. the explosion stuns the crowd and propels the ball forward. a photogate measurement determines that the cannon recoiled backwards with a speed of 7.8 m/s. determine the speed of the ball.

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.6 m below the tank bottom which is a = 6.7 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute). report your answer in meters to two decimal places.