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A plant hire company purchases a mobile crane for £120,000. It plans to charge £190 a day for hiring out the crane. For each day on which it is hired out the company expects to incur variable costs of £40.
(a) Work out how many days the company needs to hire out the crane in order to break even.
(b) If the variable costs are actually £55 and the hire charge has to be reduced to £180 per day, what is the new breakeven point?
Determine the minimum electric potential difference (in volts) that must be applied to accelerate an a-particle so that on interaction with a hydrogen atom, a ground state electron will be excited to n = 6
Develop a set of performance specifications for an electromechanical device to raise and lower the lower leg of a wheelchair user (to prevent edema).
Calculate the quantity of lime and soda required in kg for softening 50000 litres of water if the purity of lime and soda are 80% and 90% repectively
calculate the purge rate required to hold the argon in the recycle stream below 5.0%. Percentages are by volume.
Estimate the feed flow rates of glycine and guaiacol that would be needed to produce 100 kg/day of the API.
100 moles of a fuel containing methane and butane is burned with 25% excess air in a furnace producing stack gas at 300C and 105 kPa. Determine the amount of 100 psi saturated steam that can be produced from water fed in at 500F
1. How many kilograms of methane (CH4) are in perfectly insulated piston with the following properties: Volume = 2 cubic meters. Pressure = 3 bar absolute. Temperature = 50 Celcius? The ideal gas law constant R = 0.00008314 cubic meters.bar/K/gmol. A..
A conducting bar of length I is pivoted at one end and rotates at an angular velocity ω in a magnetic field B (z directed).
Compute the eddy-current loss in this core when the frequency is 750 Hz and the maximum flux density is 0.8 T.
Neglect leakage and fringing, and consider the iron to be infinitely permeable. The coil has 1000 turns and carries a direct current of 3 A. Compute the pull on the plunger for g = 1.25 cm.
One branch of a bank has 849 customers who have credit balances in a certain type of current account. The sizes of the balances in these accounts, to the nearest £, have been arranged in the following grouped frequency distribution
Why is plutonium one of the most toxic substances known?
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