iTeachChem•6mo ago

NLM Doubt Physics Help!!

yahape the string is getting loose by 1m/s and the second end is getting tightened by the cos60 component of 1m/s, so basically string is loosened by 1/2m/s, so block should go downwards by 1/4 m/s right? why did he write 1/2 then? TALKING ABOUT RELATIVE VELOCITY

9 Replies

iTeachChem Helper•6mo ago

@Gyro Gearloose

iTeachChem Helper•6mo ago

Note for OP

+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.

iTeachChem•6mo ago

Please put the name of the topic and chapter in the heading :D makes it easier to follow and find.

serenity. 力OP•6mo ago

alright, i edited it

iTeachChem•6mo ago

@Gyro Gearloose any inputs?

Ishizora•6mo ago

block 2 won't go down by cos comp of 1/2 m/s just because block 1 is moving at 1 m/s think of a case with a block resting on a wedge; if i move the wedge will that mean that the block is going down with the cos component of wedge's velocity? no, right? coming to what he did

 - Relating blocks velocity by using string constraint :
T/2 is acting on block 2 while T is on block with 1 m/s velocity using S/C block 2's velocity will come out to be half of block 1 i.e 1/2 m/s
 - This gives you the velocity of block 2 wrt block 1 ; so he then used geometry which gave him that the latter one is making 120 degree angle with the former one 
 - Using V of 2 wrt 1 = V of 2 - V of 1 he calculated the block's velocity by taking out the resultant.

 - Relating blocks velocity by using string constraint :
T/2 is acting on block 2 while T is on block with 1 m/s velocity using S/C block 2's velocity will come out to be half of block 1 i.e 1/2 m/s
 - This gives you the velocity of block 2 wrt block 1 ; so he then used geometry which gave him that the latter one is making 120 degree angle with the former one 
 - Using V of 2 wrt 1 = V of 2 - V of 1 he calculated the block's velocity by taking out the resultant.

iTeachChem•5mo ago

we good?

serenity. 力OP•5mo ago

yes +solved @iTeachChem @Ishizora

iTeachChem Helper•5mo ago

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NLM Doubt Physics Help!!

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