Problem 3: Let's say you have a flat plate, placed on the table. The coefficient of friction is 0.20. The mass of the plate is 0.2 kg. It has a length of 2 m and the width of 1 m. Next you have air at 200C flowing over the top surface with velocity of 25 m/s. You have a small metal rod that holding the plate in place. What is the force on the rod necessary to keep the plate from moving. Support Rod Plate Table The friction drag for mixed flow can be calculated using: 0.455 FD= (log Rez) 2.58 (1/2)pU (bL)- 0.0740 (Rez)a (1/2)pʊ² (bza) 1.328 + (1/2)p (b) √(Rez) The friction drag for laminar flow can be calculated using: 0.664bpU³L FDI- ✓REL TTI -M 1500 H -" -00 " " 1000 1000 1305 11310 G

A 75 pound object needs to be lifted vertically one foot. You bave a 2-inch diamcter piston actuator with a 12-inch stroke connected to a 50 psi source of presSurized air. The mass is restricted by a set of guide rails, which imit it to vertical motion, and which ase roller bearings with & friction coefficient of 0.002. Can the object be lifted? How long I will it take?

Does force of friction depends on speed for solids? does force of friction depends on speed for fluids? Defend your answer with example.

9. The thin ( 3 mm ) thick plastic panel shown in the figure is lowered from a ship to a the Поог. The construction site on осean plastic panel weighs ( 200 N) in air and is ship Cble lowered at a rate of ( 2 m/s ). Assuming the panel remains vertically oriented, calculate ing the tension force in the cable. Take ( p = 1000 10 m/s ),e and use; water Plustic Punel kg/m', v 1.31 1/5 CDlam= 1.328 / Re. CDturb = 0.072 / Re

A stationary water tank of diameter D is mounted on wheels and is placed on a nearly frictionless level surface. A smooth hole of diameter Do near the bottom of the tank allows water to jet horizontally and rearward and the water jet force propels the system forward. The water in the tank is much heavier than the tank-and-wheel assembly, so only the mass of water remaining in the tank needs to be considered in this problem. Considering the decrease in the mass of water with time, develop relations for (a) the acceleration, (b) the velocity, and (c) the distance traveled by the system as a function of time.

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what is the answer for number 3?

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