Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
astarmathsandphysics:
I did that once - ended up in a place I shouldn't be.
When I realised my mistake, I told them, "I've had so much fun. If I ever end up in the wrong place again I will make sure it's this one".
astarmathsandphysics:
A jeweler needs to electroplate gold (atomic mass 196.97 u) onto a bracelet. He knows that the charge carriers in the ionic solution are gold ions, and has calculated that he must deposit 0.20 g of gold to reach the necessary thickness. How much current does he need to plate the bracelet in 3.0 hours? (Avogadro's number is 6.02 × 1023.) ??
Mass of 1 mol of gold atoms=197.97*1.67*10^-27*6.02*10^23=198g
no gold atoms needed=0.2/198*6.02*10^23=6.08*10^20
Nogold atoms per sec =6.08*10^20/(3*3600)=5.63*10^16
so current=5.63*10^16*1.6*10^-19=9*10^-3A
ashwinkandel:
I am confused with one question of simple harmonic motion.
astarmathsandphysics:
force due to one spring is F_1 =kx and force due to other is F_2=-kx cos in opposite direction
net forec=F_1-F_2=2kx
Most UniQue™:
--- Quote from: astarmathsandphysics on March 06, 2012, 02:56:14 pm ---force due to one spring is F_1 =kx and force due to other is F_2=-kx cos in opposite direction
net forec=F_1-F_2=2kx
--- End quote ---
Wow sir your really good in physics!
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