What is the relationship between exact and inexact differentials with quasi-static pistons?
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A: PS=PLFSAS=FLALFS=ASALmcarg=πR2SπR2Lmcarg=R2SR2Lmcarg
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- Water is discharged from the hose with a speed of 42ft/sec. Determine the two possible angles the fireman can hold the hose so that the water strikes the building at B. Take S=20ft. VA = 40 ft/s 0 8 ft 4 ftFind the center of mass of a laminate bounded by y=−x,y=x,y=2 with variable density modeled by \rho (x,y)=y+5. Question 3 Answer a. (0,2619) b. (35,94) c. (−23,116) d. None of the above e. (0,1) f. (0,32)•35 Three children, each of weight 356 N, make a log raft by lashing together logs of diameter 0.30 m and length 1.80 m. How many logs will be needed to keep them afloat in fresh water? Take the den- sity of the logs to be 800 kg/m?.
- A uniform disk of mass 10.0 kg and radius of 0.248 m spins at 302 rev/min on a low-friction axle. It must be brought to a stop in 1.00 min by a brake pad that makes contact with the disk at an average distance of 0.218 m from the axis. The coefficient of friction between the pad and the disk is 0.499. A piston in a cylinder of diameter 5.00 cm presses the brake pad against the disk. Find the pressure required for the brake fluid in the cylinder. Pa Need Help? Read It3. On a very rainy day, Nick drags a box of old books to the bookstore to sell. The box moves through the puddles at U = 10 ft/min. For all calculations use an approximation that the box follows the figure. Calculate the force required to keep the box moving at U. Hints: obtain drag coefficient by calculating the Reynolds number; consider the projected area as the bottom plus the two long sides. • Determine the power (in watt) required to overcome the skin friction drag B = 2 ft L=3 ft -Water line D = 2 inJames wants to put up a wind tower. It is mounted on a 30m long, 800 kg rod, where it is supported by a piston at 4.5m away from the base and wind turbine is 1200kg. How much force is put on the piston supporting the system when James is working on it? See figure below.