Physics Question Help Please! - First year physics/bridging course (1 Viewer)

amour

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Hi BOS,
Sorry Mods- not sure where to put this thread.

Please help me work out how to do this.
Torque= force x radius

If force = 5i + 7j
and radius = 3i -2j

find torque.
Is this dot product where I go.. 5x3 + 7x-2
so torque = 1??
 

soloooooo

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I would think it would equal 15i -14j. A weird question though.
 

Dylanamali

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Hi BOS,
Sorry Mods- not sure where to put this thread.

Please help me work out how to do this.
Torque= force x radius

If force = 5i + 7j
and radius = 3i -2j

find torque.
Is this dot product where I go.. 5x3 + 7x-2
so torque = 1??
hey amour,
how come your asking a phys question?
do you need it for optom =/ ?
 

Dylanamali

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oh okay, so are you just self-learning the whole HSC course?
or prelim and HSC??
 

M99952011

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Is this HSC Physics? :O Everything has flown out of my head since HSC finished, I don't remember doing any of this. @_@
 

Ferox

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Torque= radius x force
=(3i -2j) x (5i + 7j)
=21k - (-10)k
=31k
 

soloooooo

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Thanks, I had forgotten you had to use the cross product.
 

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