1.A new machine will cost $25,000. The machine is expected to last 4 years and have no salvage value. If the interest rate is 12%, determine the return and the risk associated with the purchase. The estimated annual savings and its probability is $7000 at 30%, $8500 at 40%, and $9500 at 30%. Return? Risk?
2.A 12 in diameter pipe, 9200 f t long (f = 0.024) discharges freely into the air at an elevation 18 f t below the surface of the water at intake. It is necessary to double the flow by inserting a pump at upstream end of pipe, If the efficiency of the pump is 73%, how much power will be required ?
3.The uniform 4 meter boom has a mass of 60 kg and is pivoted to the back of the truck at A and secured by a cable at C. Calculate the magnitude of the total force supported by the connection at A if the truck starts from rest with an acceleration of 5 m/s^2. Answer is A=1192 N Distance from A to B=4 m at 120 degree angle relative to the line AC Distance from A to C= 2m