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Elevator problem; but i don't have the mass!

  • Thread starter jtwitty
  • Start date
  • #1
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Homework Statement



An elevator is lifted by a capble with a tension fo 50,000N. The weight of the elevator is 49,000N. How fast will the elevator be moving after 5 seconds if it starts from rest.

Homework Equations



IDK!

The Attempt at a Solution



I found the net force to be 1000N (50,000 - 49,000N)

But i can't plug it in anywhere because i don't know the mass of the elevator?
 

Answers and Replies

  • #2
35
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THE ELEVATOR MASS IS 4,900kg BECAUSE the weight is 49,000 so 49000 / 10 (gravity) = kg

i love figuring myself outnahhahahhahahahha

thanks for letting me put the problem out there

edit: is that right???? :/
 
  • #3
33
0

Homework Statement



An elevator is lifted by a capble with a tension fo 50,000N. The weight of the elevator is 49,000N. How fast will the elevator be moving after 5 seconds if it starts from rest.

Homework Equations



IDK!

The Attempt at a Solution



I found the net force to be 1000N (50,000 - 49,000N)

But i can't plug it in anywhere because i don't know the mass of the elevator?
ok so a = netforce /m
a = (50000-49000) / 4900
a = .2041 m/s^2

since u know w = mg
m = w/g
mass of elevator = 49000/10 (assuming g = 10 for easier purpose)
therefore mass = 4900 kg
 
  • #4
35
0
ok so a = netforce /m
a = (50000-49000) / 4900
a = .2041 m/s^2

since u know w = mg
m = w/g
mass of elevator = 49000/10 (assuming g = 10 for easier purpose)
therefore mass = 4900 kg
yay! thanks for your help :P
 
  • #5
33
0
yay! thanks for your help :P
np:D
 

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