## What is the change in energy of the mill after 1 day of paper production?

For the manufacturing of one day’s paper products a paper mill uses the necessary coal, oil, chemicals, and wood that are already stored in the mill. In addition, some of the energy needed in the mill is obtained from a waterfall of 10 6 kg of water per day falling over a difference in elevation of 100 m. Assume that the mill experiences no interactions except that with the waterfall.

(a) What is the change in energy of the mill after 1 day of paper production?

(b) At a particular day the waterfall is interrupted and the mill uses half its wood as fuel rather than feedstock for paper. What is the change in energy of the mill during that day? the energy that is made available from the burning wood is 18,000 kJ/kg, and paper requires 40,000 kJ per kg of paper.

### Calculate the maximum achievable bridge out-of-balance voltage for an applied torque T of 103 N m given the following

Four strain gauges, with specification given below, are available to measure the torque on a cylindrical shaft 4 cm in diameter connecting a motor and load. (a) Draw clearly labelled….

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A solid-state capacitive humidity sensor has a capacitance given by: C = 1.7 RH + 365pF where RH is the percentage relative humidity. The sensor has an associated parallel resistance….

### calculate the mean velocity of the gas at maximum flow rate

A pitot tube is used to measure the mean velocity of high pressure gas in a 0.15 m diameter pipe. At maximum flow rate the mean pitot differential pressure is….