Question

Q2/ 1- How would you plot (x; y) data to get a straight line, and how would you determine a and b for each of the following functions y = (ax? - b)3 ? 2- What are the factors (numerical values and units) needed to convert square centimeters to square meters? cubic feet to cubic meters? 3- Round off each of the following numbers to three significant figures (1465 , 13.35 and 1.765 x103) 4- Calculate: a) The weight in lb of a 25 lbm object. b) The mass in kg of an object that weight 25 N. 5- The mass flow rate of n-hexane (p= 0.659 g/cm) in a pipe is 6.59 g/s. What is the volumetric flow rate of the hexane?

This question was solved within three hours

Answer 1

Q2/3 - Griven, yz (an2_b)" ht line. will vs. ys y = an2-b ( Taking cube in both sides] get a straight ye of plot a² we (0,0) a² b Slope a and Intercept = b (in ave y direction)

Q2/2. 1 sq. cm = 0.0001 sq. m We need to multiply 0.0001 to convert a quantity in sq. cm to sq. m.

1 cubic ft = 0.0283168 cubic m We need to multiply 0.0283168 to convert a quantity in cubic ft to cubic m.

Q2/3. 1465 $\simeq$ 1470

13.35 $\simeq$ 13.4 [All the numbers are rounded off to three significant numbers.]

1.765*10^-7$\simeq$ 1.77*10^-7

Q2/4.a. We know, 1 lb_m = 1 lb_f

_$\therefore$25 lb_m = 25 lb_f

b. We know, 9.81 N = 1 kg

$\therefore$ 25 N = (25 / 9.81) kg = 2.55 kg

Q2/5. Mass flow rate of n-hexane = 6.59 g/s

Givwn, $\rho$ = 0.659 g/cm³

  _$\therefore$Volume flow rate of n-hexane =

6.59g/s 10cm/s 0.659g/cm3