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Physics CIE help

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astarmathsandphysics:
Clockwise and anticlockwise opposite signs. You must be careful here

sweetie:
but i think the weight of the rule as well as the 20g mass are acting in a clockwise direction, so same sign.........

astarmathsandphysics:
The 20g mass is attached to a string pulling the right hand side of the ruler up so anticlockwise

sweetie:
oops, i got it  :D ...

cud u help me in Q. 37,32,21,18,12 and 3 of may02..........

astarmathsandphysics:
 37,32,21,18,12 and 3 of may02....
37. A - V is constant E=V=d
32.P=V^2/R so R=V^2/P=240^2/100=576
originarl R=576/16=36 A
21.total mass is now 3pV in same volume so 3 times the mass occupies the same volume anddensity is 3 times bigger D
18. GPE+KE=work done against friction +KE
5+50=10+KE
KE=45 B
12.weight=upthrust+drag>upthrust D
3.only A m/s=sqrt(m/s^2 *m)=m/s

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