Recent content by cagdassalur

i understand now. thanks.

there is no external force as far as i know.

i mean replace or something. box has wheels. i think I am right cos i can turn myself in my chair without touching the ground. i think if man jumps forth and back or hit the sides with shoulder box may move.

there is a box with wheels and man inside it.my teacher is said there is no way to man move the box while his inside. i said opposite. i know I am right but i can't prove. can you help me? sry for bad eng.(not my natural lang.)

oh! finally i understood. it will be the same cos man has to pull that weight. thanks very much you have very patience. you could just tell me the answer but you didn't. if you did i just take answer to the teacher but i learned now.

ok. i get that well but what will be the total weight?

0? .

there is a centrifugal force. and there is anti centrifugal that rope has on mass and gravity force.

force that opposite way to arm holding the mass i don't know what's this word in english. it may be centrifugal.

there is no vertical force i think. but I am probably wrong.

but it can't be stay same right?

yes. i understand but when i say its be 80>x>85 you said its wrong?

ok. but how can the rope has vertical force on the man? its horizontal. ... ____O... ...o /... .../.|...<---- like this .../...|... .../.\...

i think about it and drawing a diagram really helped me and i found that the thing doesn't have a vertical force that effects on arm. only horizental force. so it will be 80. am i right?

i think when swinging the rope we have to give more pressure to arm then just holding the hope. and nothing is just raises something must be down to raise other thing. they teached us that. when I am spending more energy the things force on the groun must be down. so, it will be 80>total...