sam-smith
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Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline
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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
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Cosmo
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Registered: 29th Mar 01
Location: Im the real one!
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negative pie.
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sam-smith
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Registered: 8th Jan 07
Location: plymouth, UK
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cheers
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Cosmo
Member
Registered: 29th Mar 01
Location: Im the real one!
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can pie even be negative?
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BluKoo
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Registered: 8th Apr 02
Location: Stonehaven (Scotland)
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Steak pie.
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Dom
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Registered: 13th Sep 03
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quote: Originally posted by Cosmo
can pie even be negative?
yeah, pi can be negative
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BluKoo
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Registered: 8th Apr 02
Location: Stonehaven (Scotland)
User status: Offline
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-3.14159265358979323846264338327950288419716939937510...
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will_doyle
Banned
Registered: 25th Nov 08
Location: Exeter
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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
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John
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Registered: 30th Jun 03
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I'd imagine that the equations will have been covered in the lectures/notes/ this new thing called the internet.
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sam-smith
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Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline
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yeah but i would like a bit of guidance i am shite at this
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Hammer
Member
Registered: 11th Feb 04
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Force = Mass x Acceleration
Work Done = Force x Distance
Standard Grade Physics
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sam-smith
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Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline
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is force and effort required the same?
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sam-smith
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Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline
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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
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Hammer
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Registered: 11th Feb 04
User status: Offline
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quote: Originally posted by sam-smith
is force and effort required the same?
In this instance it's a synonym aye.
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Gaz
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Registered: 24th Aug 03
Location: Widnes, Cheshire
User status: Offline
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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!
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sam-smith
Member
Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline
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yeah it would actually, cus i could finish the stupid course and get on with what im good at
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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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.
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DannyB
Premium Member
Registered: 6th Feb 08
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Ian you are far to clever for my liking.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Offline
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Not at all, I might be wrong.
And if that were the case I would have answered the question haha
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