Gaps in knowledge? Fill them in here! (2 Viewers)

[fakingtheday]

Check Pyro's worked answer thread, he has a good solution for it.

 

[richz]

xrtzx: i got 187N as the force, it's just the addition of the FF which is equal to 0.3 x (cos10 x300) and component down the plane which is sin10 x 300.

i use rochford when i need it but my teacher is the best resource going dude.

say again, where did u get 10 degres from??

 

[fakingtheday]

My mistake dude, the angle is 20 degrees, i was doing another problem at the same time i think. Put 20 degrees into my calucaitons, should come to 187N still.

 

[dblanche]

Stress Question

Can someone help me out here with this multiple choice question from the 2004 HSC. I think they have got the answer wrong because I think it would be a double shear question not a single, so I think D is the answer


What does everyone think?

 

[fakingtheday]

it;s a single shear, trust me, it is shearing in the middle.

 

[raistlin]

hey dblanche, can u plz post ur working for 2004 HSC Q12

for support1 im getting 2930N and i dunno how to get A

 

[richz]

hello

how about this dot point

"ceramics
– structure and property
relationship, applications
– glass
– cement"

thnx

 

[hipPo3]

hello

how about this dot point

"ceramics
– structure and property
relationship, applications
– glass
– cement"

thnx

ceramics
- Electrical and Heat insulators
- brittle (its too brittle for structural purposes)
- Chemically inert
- Hard

glass
- can be manufactured in an amorphous state
- can be fabricated
- versitile

Concrete or did u mean Cement ?
for Concrete
- Can be reinforced for tensile strength
- High Compressive strength
- Heat, electrical and chemical resistance
- "Concrete cancer" (check that .. i think its from casting the concrete .. but too lazy to check)

for Cement
- bonding material
- made from limestone and sand
- Reactive with water
- Is a composite

thats all i can think of at the top of my head ..hope that helps

 

[dblanche]

Answer to truss question

Here is my working , by the way does someone have good notes on telecommunications?

 

[dblanche]

Sorry the attachments won't upload for some reason

 

[damo676767]

Digital Control Technology

In a nutshell a computer monitors, senses changes and then uses technology to rectify problems. I use ABS where a computer monitors the braking stress on each wheel, and if it senses a wheel locking from the braking it redistributes this force to other wheels.

Benefits include increased safety of cars, braking efficiency and in turn a greater fuel efficiency.

sorry to bring up an old thing but controll technology does not have to be digital.

it can be as simple as tying a dog to a tree so they can't go very far.

ie controlling where the dog goes using alolgue controll technology

 

[Adam]

True, but markers don't really like smart arse answers.

My teacher was a marker for engineering studies and he said they reward answers where they learn something new from the response. Which thinking of it now might go well with your example. It's been too long

 

[damo676767]

ok that was a bit simple

but anologue controll technology is very valid
like the water valve thinge in a toilet