Monday, January 25, 2016

and more Pythagorean help

another explanation:

The Pythagorean Theorem

The Pythagorean theorem, an important mathematical principle, uses right triangles. A right triangle is a triangle which has one right or 90° angle. The side opposite the 90° angle is called the hypotenuse .
The Pythagorean theorem states that for any right triangle c 2 = a 2 + b 2 , where c is the length of the hypotenuse and a and b are the lengths of its sides (see Fig. 9-23 ) .
The Pythagorean Theorem
Fig. 9-23.

Finding the Hypotenuse

If you need to find the hypotenuse of a right triangle, use c = The Pythagorean Theorem .

Finding the Sides of a Right Triangle

If you need to find the length of one side of a right triangle, use a = The Pythagorean Theorem or b = The Pythagorean Theorem .

more pythagorean theory help

some examples:

Example 1

Find the length of the hypotenuse of a right triangle if the length of its sides are 5 inches and 12 inches.

Solution 1

The Pythagorean Theorem

Example 2

A person drives 33 miles due east, then makes a left turn, and drives 56 miles north. How far is he from his starting point?

Solution 2

The right triangle is shown in Fig. 9-24.
The Pythagorean Theorem
Fig. 9-24.
Then
The Pythagorean Theorem

pythagorean theory help

here is a link that may be helpful to you.  

 http://www.mathwarehouse.com/geometry/triangles/how-to-use-the-pythagorean-theorem.php


once the link opens, scroll down and click on the play arrow for the video.

you may also might want to check out all the examples shown.

Friday, December 18, 2015

magnetic motor starter quiz


1.  Will this mag work properly on a three-phase motor?  Support your answer.

2.  If your answer to # 1 was no, list one way this mag could work temporarily.

3.  If your answer to # 1 was no, list one reason why it would not work.

4.  There are two red wires attached to the coil.  One goes to _____ the other to ____.

5.  What is the coil voltage of this mag? 

Monday, November 23, 2015

JUNIORS: Slips Trips and Falls quiz

on a lined piece of paper write your full name, today's date, and the words "Slips Trips and Falls quiz".  you only need to write the numbers and answers.  this will be graded as a shop homework assignment.



 Slips, Trips and Falls Quiz
Name: __________________________________________________________
1. What can improve traction on floors that are frequently wet?
a. Strap cleats onto your shoes.
b. Painting gritty coatings on the floor.
c. Using a greasy floor finish.
d. Putting up a sign.

2. If you carry loads that you can’t see over or around:
a. Make sure you have good lighting.
b. Stay off the stairs.
c. Take small steps.
d. You could trip and fall; don’t carry such loads.

3. Loose carpeting, stair treads and floor tiles:
a. Are tripping hazards.
b. Should be covered with a rubber mat.
c. Should be reported right away.
d. Both a and c.

4. What is a safe way to move materials up a ladder?
a. Hoist them up using a rope after you climb the ladder.
b. Have someone throw them up to you when you reach the top.
c. Carry them in one arm as you climb.
d. All of the above.

5. When is it safe to stand on the top step of a stepladder?
a. When you can’t get a longer ladder.
b. When you can hold on to a sturdy item above while you work
c. When the ladder is less than six feet tall.
d. Never.

Slips, Trips and Falls
6. Which of the following fall protection systems prevents falls?
a. Safety net systems
b. Guardrail systems
c. Personal fall arrest systems.
d. None of the above.

7. Ladder cages are used with:
a. Scaffolds
b. Stepladders
c. Ladders that are fixed to a building or structure
d. Portable extension ladders.


8. In a personal fall arrest system, OSHA recommends the use of:
a. Full body harnesses.
b. Body belts.
c. Safety nets.
d. None of the above.

9. What is used to support a worker on a vertical surface so he or she can work with both hands free?
a. A deceleration device.
b. A positioning device system.
c. A ladder cage.
d. A safety net system.

JUNIORS: Electrical Hazards quiz

on a lined piece of paper write your full name, today's date, and the words "Electrical Hazards quiz".  you only need to write the numbers and answers.  this will be graded as a theory quiz grade.



Common Electrical Hazards Quiz – Trainers Module
Please mark the correct answer below:
1. Cabinets and boxes shall
a. have openings closed
b. have covers
c. if covers are metal they must be grounded
d. all the above

2. Flexible cords may be used:
a. in ceilings or walls
b. as long as attached to building surface
c. to prevent transmission of noise or vibration
d. none of the above

3. Flexible cords may not be:
a. attached to building surfaces
b. run through walls, ceilings, and floors
c. run through doorways, windows
d. all of the above

4. Qualified persons (i.e. those permitted to work on or near exposed energized
parts) shall, at a minimum, be trained in and familiar with the following:
a. ability to distinguish exposed live parts from other parts of electric equipment.
b. skills necessary to determine the nominal voltage of exposed live parts
c. clearance distances and the voltages the qualified person will be exposed to
d. all of the above

5. Minimum clearance in front of electrical equipment (live parts) shall be no less
than:
a. 12”
b. 18”
c. 36”
d. 48”

6. Which of the following people is approved to work on energized circuits or
equipment?
a. Chief Engineer
b. an apprentice with at least six months experience
c. a Qualified person
d. anybody in an emergency

7. Temperature from an arc flash may reach
a. 600° F
b. 5,200° F
c. 35,000° F
d. 100,000° F




8. Which of the following is not a hazard when working with electricity?
a. electric shock
b. blast
c. frostbite
d. arc flash

9. Which of the following is an approved alerting technique for warning employees
of hazards that could result in electrical shock?
a. safety signs and tags
b. barricades
c. attendants
d. all of the above

10. Extension cords must be visually examined
a. before use on any shift
b. once a week
c. every six months
d. once per year