Determine the flexural capacity, ÏMn for the singly reinforced rectangular beams having the following properties. Use strength reduction factors from ACI Code. Use beam 1 as a reference, identify the best way to increase the flexural capacity of a reinforced concrete beam and discuss.

Beam No. b (in.) d (in.) Bars f_c (psi) f_y (psi)
1 12 22 3 No. 7 4,000 60,000
2 12 22 2 No. 9 plus 1 No. 8 4,000 60,000
3 12 22 3 No. 7 4,000 80,000
4 12 22 3 No. 7 6,000 60,000
5 12 33 3 No. 7 4,000 60,000

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2