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question

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cara.mel:
a)
a = v/t
=(2--5)/.2
=35ms^-2 north

b)
F = ma
= 200*35 = 7000N

Might be wrong because I have a headache. =/

fredrick:
yeh i got 35m/s^2 too but the back says 3.5m/s^2?

thanks for clearing that up

dcc:

--- Quote from: Obsolete Chaos on January 17, 2008, 03:26:03 pm ---
--- Quote from: dcc on January 17, 2008, 03:16:30 pm ---The speed will be negative because the direction of the recoil is opposite to the direction of the bullet. (which we consider to be the positive direction)

For example, due to conservation of momentum, the momentum after firing should equal 0





Using positive 1.5 would yield a result of 12 N


--- End quote ---
yeah... i'm lazy :P

but then that's the thing that seperates 40+ from 30s... *makes major mental note* thnx dcc

--- End quote ---

lol its just like if you have 0 = x + y, x = -y, not x = y :P

phagist_:

--- Quote from: Obsolete Chaos on January 17, 2008, 03:26:03 pm ---yeah... i'm lazy :P

but then that's the thing that seperates 40+ from 30s... *makes major mental note* thnx dcc

--- End quote ---
I think most of the time they ask for 'speed' which is a scalar quantity thus direction doesn't matter.
Nevertheless learn the difference between velocity and speed.

sxcalexc:
Hmm question - about the way questions are worded. It says the 'speed' is 5ms but then it gives the direction ie. due south. So would we count this as a vector - and thus count acceleration as a vector when questions are worded like this, ALWAYS?

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