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sam-smith

Member

Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline

21st May 09 at 14:38

a screw jack has a singe start thread of pitch 10mm and is used to raise a load of 900kg. the required effort is 75Nn, applied at the end of an operating handle 600mm long.
for these operating conditions determine:
i) the mechanical advantage
ii) the efficiency of the machine

and

the top pulleys of a Weston differencial pulley block have diameters of 210mm and 190mm
dtermine

i) the effort required to raise the load of 150kg if the efficiency of the system is 35%

ii) the work done to raise the load of 150kg through a height of 2.5m

Cosmo

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Registered: 29th Mar 01
Location: Im the real one!
User status: Offline

21st May 09 at 14:39

negative pie.

sam-smith

Member

Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline

21st May 09 at 14:39

cheers

Cosmo

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Registered: 29th Mar 01
Location: Im the real one!
User status: Offline

21st May 09 at 14:40

can pie even be negative?

BluKoo

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Registered: 8th Apr 02
Location: Stonehaven (Scotland)
User status: Offline

21st May 09 at 14:41

Steak pie.

Dom

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Registered: 13th Sep 03
User status: Offline

21st May 09 at 14:43

quote:
Originally posted by Cosmo
can pie even be negative?

yeah, pi can be negative

BluKoo

Member

Registered: 8th Apr 02
Location: Stonehaven (Scotland)
User status: Offline

21st May 09 at 14:44

-3.14159265358979323846264338327950288419716939937510...

will_doyle

Banned

Registered: 25th Nov 08
Location: Exeter
User status: Offline

21st May 09 at 14:45

quote:
Originally posted by sam-smith
a screw jack has a singe start thread of pitch 10mm and is used to raise a load of 900kg. the required effort is 75Nn, applied at the end of an operating handle 600mm long.
for these operating conditions determine:
i) the mechanical advantage
ii) the efficiency of the machine

and

the top pulleys of a Weston differencial pulley block have diameters of 210mm and 190mm
dtermine

i) the effort required to raise the load of 150kg if the efficiency of the system is 35%

ii) the work done to raise the load of 150kg through a height of 2.5m

Mechanical engineering ftw

John

Member

Registered: 30th Jun 03
User status: Offline

21st May 09 at 14:49

I'd imagine that the equations will have been covered in the lectures/notes/ this new thing called the internet.

sam-smith

Member

Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline

21st May 09 at 15:38

yeah but i would like a bit of guidance i am shite at this

Hammer

Member

Registered: 11th Feb 04
User status: Offline

21st May 09 at 15:46

Force = Mass x Acceleration
Work Done = Force x Distance

Standard Grade Physics

sam-smith

Member

Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline

21st May 09 at 15:59

is force and effort required the same?

sam-smith

Member

Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline

21st May 09 at 15:59

quote:
Originally posted by will_doyle

quote:
Originally posted by sam-smith
a screw jack has a singe start thread of pitch 10mm and is used to raise a load of 900kg. the required effort is 75Nn, applied at the end of an operating handle 600mm long.
for these operating conditions determine:
i) the mechanical advantage
ii) the efficiency of the machine

and

the top pulleys of a Weston differencial pulley block have diameters of 210mm and 190mm
dtermine

i) the effort required to raise the load of 150kg if the efficiency of the system is 35%

ii) the work done to raise the load of 150kg through a height of 2.5m

Mechanical engineering ftw

can you help then or not

Hammer

Member

Registered: 11th Feb 04
User status: Offline

21st May 09 at 16:03

quote:
Originally posted by sam-smith
is force and effort required the same?

In this instance it's a synonym aye.

Gaz

Member

Registered: 24th Aug 03
Location: Widnes, Cheshire
User status: Offline

21st May 09 at 16:20

quote:
Originally posted by sam-smith
yeah but i would like a bit of guidance i am shite at this

And cheating is going to help you complete what ever course you are doing?

Wise-up son!

sam-smith

Member

Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline

21st May 09 at 17:57

yeah it would actually, cus i could finish the stupid course and get on with what im good at

Ian

Site Administrator

Registered: 28th Aug 99
Location: Liverpool
User status: Offline

21st May 09 at 20:16

quote:
Originally posted by Dom
yeah, pi can be negative

Excuse the pedantry but I disagree. Pi is a constant. It's rational representation can be negated but Pi itself has no business being anything other than the ratio between radius and circumference. At least in the case of every shape space I'm familiar with. There may be some complex geometric universe in which case the above is perfectly acceptable.

DannyB

Premium Member

Registered: 6th Feb 08
User status: Offline

21st May 09 at 20:17

Ian you are far to clever for my liking.

Ian

Site Administrator

Registered: 28th Aug 99
Location: Liverpool
User status: Offline

21st May 09 at 20:18

Not at all, I might be wrong.

And if that were the case I would have answered the question haha

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