Engineering Answers

Direction. Show the solution for each of the problem below:

I. Consider Teflon, the polymer made from tetrafluoroethylene.

Draw a portion of the Teflon molecule.

Calculate the molar mass of a Teflon molecule that contains 5.0 x 104 CF2 units.

What are the mass percents of C and F in Teflon?

II. For alanine, Ka1 = 5.1 x 10 -3, Ka2 = 1.8 x 10 -10

a) Calculate the ratios [Z] / [] and [Z] / [] at pH = 10.50

b) Calculate the pH when [Z] = [] and when [Z] = [] if pH= - log []

Direction. Show the solution for each of the problem below:

I. Consider Teflon, the polymer made from tetrafluoroethylene.

Draw a portion of the Teflon molecule.

Calculate the molar mass of a Teflon molecule that contains 5.0 x 104 CF2 units.

What are the mass percents of C and F in Teflon?

II. For alanine, Ka1 = 5.1 x 10 -3, Ka2 = 1.8 x 10 -10

a) Calculate the ratios [Z] / [] and [Z] / [] at pH = 10.50

b) Calculate the pH when [Z] = [] and when [Z] = [] if pH= - log []

The positions, of a particle moving along a horizontal straight line is given by the equation s=6t² - 4, where s is in meter and t is the time in seconds. The particle is 4m to the right of the origin when t = 0.

A.1. Determine the displacement of the particle during the time interval from t = 2s to t = 4s.

A.2. Determine the velocity and acceleration of the particle when t = 4s.

a = 12t²t³ + t, Determine velocity equation and position equation

The magnitude of the linear acceleration of a point moving along a vertical path is given by the equation a = 6t - 24, where a is in m/s and t is in seconds. The acceleration is upward when t = 5s; The point is 4m below the origin when t = 0 and 23 m above the origin when t = 3 s.Determine:

B.1. The velocity when t = 3 sec

B.2. The displacement during the time interval from t = 0 tot = 4 s

B.3. The total distance travelled during the time interval from t = 0 tot = 4s

for the force system shown in figure (22), determine the resultant force (R) and the force (P). w=weight=200lb

(1)Find the total charge and the current flowing in a cylindrical conductor (solid wire)of length 1m

and radius 1mm, given that the density of the charge, n = 1029 carriers/m3

, and the charge carrier

velocity, u = 19.9

10-6 m/s.

A car is accelerating in the +x direction. At 2s the car is 100m from the starting point. After an additional 5s, it is 1.5km from the starting point.

Determine the average velocity of the car for the first 5s of its travel.

Determine the average velocity of the car for the entire period of its travel.

Determine the acceleration of A4 on link 4 for the quick

return mechanism given below. Link 2 rotates 10 rad/sec CW.

Fixed link 0,04= 300mm, Driving link O2A = 100mm, 0 = 51° and B =

18º. Also find out coriolis component of acceleration and angular

acceleration of link 4.

A bar AB of 6mts length and 100 N weight is hinged at A.it supports a load of 25 kg at point B.the end B of the bar is connected to the wall by string BC . Determine the tension in the string and the reaction at A.