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4. In open channel flow, how does the channel material change the total flow? a. Increased roughness decreased flow b. Increased roughness increases flow c. Decreased roughness decreased flow d. Decreased roughness does not affect flow Waterjet 5. A horizontal water jet impacts a vertical perpendicular plate at a flow of 2 /s. If the external force required to hold the plate in place is 100 lbf, what is the velocity of the water? Assume the density of water is 1.94 slug/t1. a. 4ft/s b. 13 ft/s c25ft/s d. 50 ft/s H 6. What is the atmospheric pressure on a planet if the absolute pressure is 100 kPa and the gage pressure is 10 RPa? a. 10 kPa b. 80 kPa c90 kPa d. 100 kPa 7. Gate AB is 2 ft wide and 4 ft tall. It is hinged at Point A and restrained by Block B. If the fluld has a depth of 12 ft and a specific weight of 62.5 lb/tv, what is the resultant force? 810 lbs 3,800 lbs 5,000 lbs 6,200 lbs a. 3. b. C 12 ft d. A+ Gate