Physics: Post your doubts here!

[i_try9621]

Someone help me with this. Answer for this is D. It's from 9702/12/M/J/15

 

[qwertypoiu]

View attachment 60689 Someone help me with this. Answer for this is D. It's from 9702/12/M/J/15

s = ut + 1/2 * at^2
u = 0
s = 1/2 * at^2
a = 2s / t^2
g = 2h/ t^2

For g to be large, either h is larger or t is smaller. Only D satisfies this.

 

[AnonymousX9]

Guys pls help with this one^

 

[qwertypoiu]

Guys pls help with this one^

D?

 

[AnonymousX9]

D?

Yes, it is D. How? I don't get it.

 

[Saad the Paki]

Yes, it is D. How? I don't get it.

Consider anti clockwise direction of current as positive. Current leaves V1 from +ve terminal and goes in the anti clockwise direction. However V2 and V3 push current in THE CLOCKWISE direction which is opposite to V1.
So thus V1 will be positive and V2 & V3 will be negative.
V1-V2-V3 . Thus option D is correct

 

[Rizwan Javed]

mistique_bee

 

[mistique_bee]

mistique_bee

thanks

 

[Rizwan Javed]

mistique_bee

 

[mistique_bee]

mistique_bee

only p1...thanks

 

[i_try9621]

HELP Ans is B, from 12/M/J/15

 

[i_try9621]

s = ut + 1/2 * at^2
u = 0
s = 1/2 * at^2
a = 2s / t^2
g = 2h/ t^2

For g to be large, either h is larger or t is smaller. Only D satisfies this.

Thanks!

 

[i_try9621]

see solution 974 at
http://physics-ref.blogspot.com/2015/09/physics-9702-doubts-help-page-201.html

I am grateful for this.

 

[Darth Vader]

Can anyone give me the solution for this

 

[areeba240]

plzz help
thanks in advance

 

[Darth Vader]

View attachment 60711
plzz help
thanks in advance

Is the answer B ?

 

[areeba240]

Is the answer B ?

no its A

 

[Darth Vader]

no its A

Aha because upthrust is affected when there is change in depth as in the case the objects are not moving, so same upthrust . I hope you find this helpfull

 

[Saad the Paki]

no its A

Upthrust is caused by difference in pressure at the top and bottom of the block.
The pressure is due to WATER. Pressure changes with height but since all blocks have the same height and all are in the same fluid thus all blocks will have an equal difference of pressure between the top and bottom. Therefore all of them will experience same Upthrust.

The formula pressure = h × D ×g is for fluids and the density is of the fluid so it's the desnity of liquid that matters NOT the object immersed

 

[amal sharkawi]