- #1
ant284
Hi,
here is the question:
there is a elevator, an man is in it, via a pulley he can raise the elevator.
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zzzzz|zz|
---zz|------
|zzzz|zzzzz|
|zzzz|zzzzz|
|zzz\o/zzzz|
|zzzz|zzzzz|
|zzz/z\zzzz|
------------
This is my picture so can't do better
z are empty space as this forums gets rid of them
there is a man in the middle of the box, pulling a pulley.
the elevator is 30kg the man is 70kg,
this man exert a force of 300N to rise himself, we need to find the acceleration.
the answer is 5m/s^2 but i can't find why.
What i do is that
the mass of the whole system is 100kg (man + elevator)
the tension in the string is 300N, and using the formula
Mg-T=ma
where g = 10
700-300=100a
4m/s^2
any feed back is appreciated
here is the question:
there is a elevator, an man is in it, via a pulley he can raise the elevator.
zzzzz/o\
zzzzz|zz\
zzzzz|zz|
---zz|------
|zzzz|zzzzz|
|zzzz|zzzzz|
|zzz\o/zzzz|
|zzzz|zzzzz|
|zzz/z\zzzz|
------------
This is my picture so can't do better
z are empty space as this forums gets rid of them
there is a man in the middle of the box, pulling a pulley.
the elevator is 30kg the man is 70kg,
this man exert a force of 300N to rise himself, we need to find the acceleration.
the answer is 5m/s^2 but i can't find why.
What i do is that
the mass of the whole system is 100kg (man + elevator)
the tension in the string is 300N, and using the formula
Mg-T=ma
where g = 10
700-300=100a
4m/s^2
any feed back is appreciated
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