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The maintenance costs associated with a machine are $2,000 per year for the first ten years, and $1,000 per year thereafter. The machine has an infinite life. If interest is 10%, what is the present worth of the annual disbursements?
a) $16,145
b) $19,678
c) $21,300
d) $92,136
the strength of titanium alloy is found to be 450 mpa when the grain size is 17 x 10-6 m and 565 mpa when the grain
Determine the uncertainty in the determination of the two specified temperatures. State the relative influence of instrument uncertainty and surface emissivity uncertainty.
hot water at an average temperature of 90oc passes through a row of eight parallel pipes that are 4 m long and have an
Knowing that crank AB rotates about point A with a constant angular velocity of 900 rpm clockwise, determine the acceleration of the piston P when θ = 120°.
a hydroelectric power station requires water to be pumped from its feeder dam to a secondary dam using two pumps each
Compute the forces in the vertical and horizontal directions on the block shown in Fig. 16.12. The fluid stream is a 1.75-in-diametcr jet of water at 60°F with a velocity of 25 ft/s. The velocity leaving the block is also 25 ft/s.
a dragster starts from rest and has an acceleration described by the graph. determine the time t for it to stop. also
A high-performance automotive driveshaft is to be made of a 4-inch outer diameter 6061-T6 Aluminium tube. The shaft is to transmit 500 hp at 3000 rpm and requires a minimum factor of Safety against a shear yield failure of 3.0. Objective:
steam flowing through a long thin-walled pipe maintains the pipe wall at a uniform temperature of 500k. the pipe is
Gear A rotates with an angular velocity of 100 rpm clockwise. Knowing that the angular velocity of arm AB is 50 rpm counterclockwise, determine the corresponding angular velocity of gear B.
the need arises in a laboratory for 2000cm3 of an antifreeze consisting of a 30 mole-percent solution methanol in
Describe the main kinds of social mechanisms that are used by people to communicate and collaborate.
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