Just for fun, if you go to : "The Force of Gravity. Cavendish Experiment" uploaded by DaveZ, th-cam.com/video/VYf-Glwtr68/w-d-xo.html you can calculate a value for G (I calculate G=4.5E-11) by estimating the variables in the video by eye (all SI units): m1=43kg, 30cm cubed box, density of sand is 1.6 m2=0.5kg, looks to be a half liter bottle of water r= 0.03 m, estimated radius of the small mass m2 T=12*60=720seconds (period of the pendulum, which he says in the video is 12 minutes) L=4 m (distance from mirror on balance to the wall, estimated) ds=0.14 m (total deflection of the light spot, the piece of paper that the light was projected onto seemed to be A4, which is roughly 30cm long ) b=0.15m (distance from center of the box of sand to the center of the bottle of water, ie half of the width of the box d=0.5 m (distance from axis of balance to center of bottle of water) mrod=0.087kg , weight of a similar meter stick The following parameters are then calculated: Moment of inertia of the balance I=2(2/5*m2*r^2 + m2*(d/2)^2 )+(1/12*mrod*d^2)=0.06466525 Spring constant k deduced from the period of oscillation. k=(4pi^2*I)/(T^2)= 4.93e-06 Angle of deflection theta=ds/4L=0.00875 Then G=(k*theta*b^2)/(2*d*m1*m2)=4.5E-11
Hope you'll read it; Hello, i just started python but i found out that to study cfd i need openfoam and c++ This killed me cause i'm forced to study i new language + program from 0; will you ever make something with c++ or a cool video on some cfd study with python? Even really easy or how to implement python with c++ based program
I probably won't do any c++. For me, it's all about the physics. I just use python as a way to explain the important physics concepts and numerical calculations.
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Just for fun, if you go to : "The Force of Gravity. Cavendish Experiment" uploaded by DaveZ, th-cam.com/video/VYf-Glwtr68/w-d-xo.html
you can calculate a value for G (I calculate G=4.5E-11) by estimating the variables in the video by eye (all SI units):
m1=43kg, 30cm cubed box, density of sand is 1.6
m2=0.5kg, looks to be a half liter bottle of water
r= 0.03 m, estimated radius of the small mass m2
T=12*60=720seconds (period of the pendulum, which he says in the video is 12 minutes)
L=4 m (distance from mirror on balance to the wall, estimated)
ds=0.14 m (total deflection of the light spot, the piece of paper that the light was projected onto seemed to be A4, which is roughly 30cm long )
b=0.15m (distance from center of the box of sand to the center of the bottle of water, ie half of the width of the box
d=0.5 m (distance from axis of balance to center of bottle of water)
mrod=0.087kg , weight of a similar meter stick
The following parameters are then calculated:
Moment of inertia of the balance I=2(2/5*m2*r^2 + m2*(d/2)^2 )+(1/12*mrod*d^2)=0.06466525
Spring constant k deduced from the period of oscillation. k=(4pi^2*I)/(T^2)= 4.93e-06
Angle of deflection theta=ds/4L=0.00875
Then G=(k*theta*b^2)/(2*d*m1*m2)=4.5E-11
Hope you'll read it; Hello, i just started python but i found out that to study cfd i need openfoam and c++
This killed me cause i'm forced to study i new language + program from 0; will you ever make something with c++ or a cool video on some cfd study with python? Even really easy or how to implement python with c++ based program
I probably won't do any c++. For me, it's all about the physics. I just use python as a way to explain the important physics concepts and numerical calculations.
@@DotPhysics what about a fluiddynamic simulation with python?