(2) Convert 304.801 millimeters to inches.

e.

the numbers of teeth?

f.

Divide 80 trucks between two sergeants in the ratio of 5 to 3.

g.

The efficiency of a machine is commonly stated as being the ratio of

the output to the input (E = O/I).

E = efficiency, O = output, and I =

output. Suppose the input in a motor is 7000 watts and the output is 6500

watts. What is the efficiency of this motor?

h.

Use the rules of proportion to solve the following problems:

(1) 70 : 45 :: 45 : X

(2) 3 1/4 : 7 4/5 :: 15 : X

(3) X : 5.6 :: 45 : 125

i.

Study the gear train in figure 29 on the following page and find the

rpm of the 36-tooth gear.

j.

A certain single-thread worm makes 25 revolutions-per-second.

It

turns a worm wheel that has 27 teeth. How many revolutions-per-minute will

this worm gear make?

k.

Solve for the following sides of the right triangle:

(1) Find side a if sin A = 0.8, and side c = 18.5 cm.

(2) Find side b if cos A = 0.35 and side c = 4.25 cm.

(3) Find side a if tan A = 1.902 and side b = 3.75 cm.

1.

Use the instructions for calculation of angles in paragraph 4, Lesson

2, Task 3 (on page 56) to solve the following problems: