Given the project as shown in the table below:

Activity Predecessor(s) Normal Crash Normal Crash
Time (Weeks) Time Cost ($) Cost ($)
A - 4 2 4500 6600
B - 7 4 12000 18000
C A 2 1 6000 8000
D A 6 4 5250 8000
E B 5 3 7125 11000
F C 3 2 3000 4000
G D 2 1 6000 8000
H D, F 4 2 5250 7500
I E, G 4 2 4500 8500
J E 3 1 7500 14000

What is the cost of crash per week for activity C?

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

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

The proportional limit is always greater than the yield strength for a material. a)-trune b)- false