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Physics: Post your doubts here!

salvatore

salvatore

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Two balls roll from rest down the same slope, but ball X reaches the bottom of the slope in half the time it takes Y. If ball X was accelerating at a m/s2, then Y's acceleration, in m/s2, was
A. ¼a
B. ½a
C. 2 a
D.4 a

Could someone please help me with the question above? Thanks :)
 
ruby_fern

ruby_fern

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Can someone please explain how the seperation of atoms is the cube root of the volume of each atom?? TIA
9702/22/o/n/09 ... question number 2.b)ii.2)
 
dubi2pro

dubi2pro

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need help!

i have 2 confusions in the fluid dynamics,

1. i knw all the forces on a ball moving downwards through a fluid, but what are the forces on the ball if it moves up through the fluid?

2. For calculating the Velocity for the ball falling/going up the fluid which formula should we use, there are 2 to use.

* v= 2*r^2*g (Ps-Pf)/9*viscosity

or

* v= F/6*pie(viscosity*radius)
 
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