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Brazil is rapidly developing into one of the world’s most dynamic economies. As a country it is blessed with great mineral resources, abundant unused farmland, and network of free flowing rivers. But, to achieve its potential, it will need a much-expanded transportation network and considerably expanded electric generation capacity. Much of this expansion will occur in the undeveloped center of the country including the Amazon region. Define the major obstacles to large-scale development and suggest the best technologies to achieve it.
3.4 A storage tank is 5 m in diameter, 4 m high and the density of the fluid it
contains is 795 kg/m3. Determine the required wall thickness if the yield
stress of the material is 325 MPa, the factor of safety is 10 and the efficiency of
the longitudinal joint is 80 %.
A circular metal plate with radius 0.22 m. Calculate the net torque about O given that F1 = 17.4 N, F2 = 7.2 N, F3 = 14 N, F4 = 5.4 N, θ1 = 58°, and θ2 = 38°.
A 333 - g ball is attached to a string 1.73 m long. The ball is spinning at a constant velocity of 5.4 rev/s. Determine the acceleration of the object.
A 45.3 - cm radius wheel is uniformly speeding up from 146 rev/min to 621 rev/min within 26.5 s. Find the tangential acceleration.
A 61 block is moving at a velocity of 13.86 m/s on a frictionless surface. A constant force F is applied for 5 seconds which caused the block to accelerate at a rate of 2.86 m/s^2. Find F.
A 6730 - kg truck traveling at 6.1 m/s east collides with a 2470 - kg car moving at 23.66 m/s in a direction 35° south of west. After the collision, the two vehicles remain tangled together. With what velocity (magnitude only) does the wreckage begin to move?
The evaporative condenser of an ammonia refrigeration plant has a water flow rate of 230 kg/s and enters the natural draft cooling tower at 40 C. The water is cooled to 30 C by air entering at 36 C db and 38% RH. The air leaves the tower as saturated at 45 C db. Calculate:
(a) Amount of makeup water in kg/hr.
(b) The cooling tower efficiency (%).
Problem: A dealer supplies you the following information with regard to a product dealt in by him:
Annual demand: 10,000 units
Ordering cost: Rs. 10/- per order
Price: Rs. 20/- per unit
Inventory carrying cost: 20% of the value of inventory per year.
The dealer is considering the possibility of allowing some back-order (stock-out) to occur. He has estimated that the annual cost of back-ordering will be 25% of the value of inventory.
[1] What should be the optimal number of units (product) he should by in one lot?
[2] What quantity of the product should be allowed to be back-ordered, if any?
[3] What would the maximum inventory level?
[4] Would you recommend to allow back-ordering? If so, what would be the annual cost saving/ loss by adopting the policy of back-ordering
A 0.0856 m3 drums contains saturated water and saturated vapor at 370oC. (a) Find the mass of each if their volumes are equal. What is the quality? (b) Find the volume occupied by each if their masses are equal.
