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Physics: Post your doubts here!

A

a.abid

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ShaanSiddiq090909 said:
Nope. It's A!
Click to expand...
Oh yeah...look
For x...3 div represent 12V
Hence 1division=12/3=4V
Y is covering only 1 div vertically hence its voltage is 4V

Now for the horizontal...in X 50Hz has to be converted to time period....hence 1/50=0.02s......which is equal to 0.02*1000=20ms......X and Y have the same time period =)
 
ShaanSiddiq090909

ShaanSiddiq090909

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a.abid said:
Oh yeah...look
For x...3 div represent 12V
Hence 1division=12/3=4V
Y is covering only 1 div vertically hence its voltage is 4V

Now for the horizontal...in X 50Hz has to be converted to time period....hence 1/50=0.02s......which is equal to 0.02*1000=20ms......X and Y have the same time period =)
Click to expand...

Got it! :)
Thaanks alot!
 
A

a.abid

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taimoor.08 said:
and for question 10 use the formula Force Multiplied by time =change of momentum
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Well for this shouldn't the answer be D??? Because change in momentum is like final momentum -initial momentum :/ these momentum and dynamics questions always confuse me :/
 
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sara kamal

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TaffsAsLevel said:
for 32, resultant force is zero because it rotates at a constant speed because and anti clockwise because E is downward so downward is negative so it repels it and it became anti clockwise, C

For 23, try to compare both of the E for their respective length and radius then compare the multiples, I can't do the working its too long, answer B

For 20, E=mgx so g is the accelration due to gravity therefore g=E/mx or magnitude=E/mx and direction is toward earth but it says loses EPE so direction must be towards the right isn't it because it says P to Q. so A
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Thank you so much:)
 
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sara kamal

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TaffsAsLevel said:
for 32, resultant force is zero because it rotates at a constant speed because and anti clockwise because E is downward so downward is negative so it repels it and it became anti clockwise, C

For 23, try to compare both of the E for their respective length and radius then compare the multiples, I can't do the working its too long, answer B

For 20, E=mgx so g is the accelration due to gravity therefore g=E/mx or magnitude=E/mx and direction is toward earth but it says loses EPE so direction must be towards the right isn't it because it says P to Q. so A
Click to expand...
Yousif Mukkhtar said:
Q32:
Resultant force is zero as forces acting on Q and -Q are same in magnitude but opposite in directions. Now you can see that both forces form a couple which turns the rod anticlockwise.

Q23:
Both wires are of the same material which is steel so both Young modulus are exactly same. DImensions do not matter when materials are exactly same
Q20:
Formula for PE is mgh

Here E is the potential energy lost. So:
pe=mgh
E=mgx
g=E/mx and this happens in the right direction. If it is in the opposite direction pe is gained not lost![/quo


Jazak Allah Khairan!
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