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Physics: Post your doubts here!

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View attachment 54382

CAN ANYONE ANSWER PLZZZZZZ

4VqP5U.png
 
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How to do this? ans is C
When finding between Y and Z, the other two would be in series and in parallel with the 5 Ω one.
1/2R+1/5=1/2.5.
R=2.5 Ω
Now 5 Ω and of the 2.5 Ω resistors will be in series and these will be in parallel to the other 2.5 Ω resistor when calculating between X and Y. Calculate to get 1.9 Ω.
 
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View attachment 54364
How C?
E = FL/Ax
E = 2L/(A/4)
E = 8x more ??
Same steel means same Young Modulus. The difference will be in extension.
Momentum before collision: 8+4=12
Velocity after collision: 12/6=2 ms^-1
KE= 0.5*6*2^2=12 J
View attachment 54368
I know the answer is C but which states do A B and D represent?
None. They are just a mixture of properties of solids, liquids and gases.
 
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Density = Mass/Volume

Volume of sphere = 4/3*pi*r3

Percentage uncertainty of diameter = 0.02/2.20*100 = 0.909%
Percentage uncertainty of mass = 0.005/0.506*100 = 0.988%

Since the diameter has to be halved to find the radius and then cubed, we multiply the uncertainty by 3.

Therefore, 3(0.909) + 0.988 = 3.7%
Thank you:)
 
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help me with this question pls.
 

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