YumYum247
  • YumYum247
Someone please help me!!!
Physics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
good luck :)
YumYum247
  • YumYum247
Thanks :)
YumYum247
  • YumYum247
49e) Determine the velocity of the elevator 12 sec after the passengers have entered the elevator.

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YumYum247
  • YumYum247
@Abhisar
Abhisar
  • Abhisar
Ok, what's the question?
YumYum247
  • YumYum247
49e) Determine the velocity of the elevator 12 sec after the passengers have entered the elevator.
Abhisar
  • Abhisar
Have you calculated the net acceleration?
YumYum247
  • YumYum247
10.29m/sec^2 = Net Acceleration
Abhisar
  • Abhisar
You can use v=u+at now to find v after 12 seconds.
YumYum247
  • YumYum247
but i don't know my initial velocity!!
YumYum247
  • YumYum247
i was plannign on using Vf = Vi X a.t but i don't have the initial velo
Abhisar
  • Abhisar
Applied force - (Frictional force + Gravitational Force) = Net Force
YumYum247
  • YumYum247
ok?
YumYum247
  • YumYum247
what do i do with that?!?!?!? what will i get tho?!?!?!?
Abhisar
  • Abhisar
I think you have calculated the net accn wrong...
YumYum247
  • YumYum247
can you please take 2 seconds and go back and read 49b)
YumYum247
  • YumYum247
it's at the top.
Abhisar
  • Abhisar
Ok, let's see that part again. There are 3 forces acting on the elevator. Force due to the elevator cable upwards, force of friction downwards and gravitational force downwards. Right?
YumYum247
  • YumYum247
are you saying that i should have combined the frictional and gravitational forces?!?!? Applied force - ""(Frictional force + Gravitational Force)"" = Net Force
YumYum247
  • YumYum247
yes that;s right!
Abhisar
  • Abhisar
Yeah, that's what i am saying !!
YumYum247
  • YumYum247
but i didn't include the gravitational force for some reason idek. i though once an object overcome the force of gravity, the effects of gravity don't count.
Abhisar
  • Abhisar
No that's not true..
YumYum247
  • YumYum247
ok please help me here for a sec. If an object is travelling faster than 9.80m/sec^2 up, does the effects/ the gravitational force count?
Abhisar
  • Abhisar
Yes, gravity is always working. Suppose a body is of mass 1 Kg is travelling with an acceleration 10m/s^2 then it means that force acting on it is 20 N. 10 N is used in neutralising the gravitational force and then other 10N for giving its acceleration.
YumYum247
  • YumYum247
because imagine if your inside an elevator which is going at 15m/sec^2, your initial mass is 50Kg, would you not feel heavier due to the sheer upward force the evelator is pressing you with?????
Abhisar
  • Abhisar
Read this http://hyperphysics.phy-astr.gsu.edu/hbase/elev.html
YumYum247
  • YumYum247
ok...so once i have my net acceleration how do i determine the velocity of the elevator? Please just leave the formula. and i'll do the rest :)
Abhisar
  • Abhisar
v=u+at V is your final velocity, u is your initial velocity which is 0 in this case, a and t are acceleration and time.
YumYum247
  • YumYum247
ok Thanks and I Love you!!! Muuuuuha :"D GOD BLESS YOU DEAR. Long Live!!
Abhisar
  • Abhisar
o_O You're welcome..
YumYum247
  • YumYum247
:"D

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