The following data give the drying time T of a certain paint as a function
of the amount of a certain additive A.
a. Find the rst-, second-, third-, and fourth-degree polynomials that t
the data, and plot each polynomial with the data. Determine the quality
of the curve t for each by computing J, SJ, S and r2r
2
.
b. Use the polynomial giving the best t to estimate the amount of
additive that minimizes the drying time.

A (oz) 0 1 2 3 4 5 6 7 8 9 T (min) 130 115 110 90 89 89 95 100 110 125

Fluids at rest possess no flow energy. a)- true b)- false

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?