Question

Someone please help me!!!

Answer 1

good luck :)

Answer 2

Thanks :)

Answer 3

49e) Determine the velocity of the elevator 12 sec after the passengers have entered the elevator.

Answer 4

@Abhisar

Answer 5

Ok, what's the question?

Answer 6

49e) Determine the velocity of the elevator 12 sec after the passengers have entered the elevator.

Answer 7

Have you calculated the net acceleration?

Answer 8

10.29m/sec^2 = Net Acceleration

Answer 9

You can use v=u+at now to find v after 12 seconds.

Answer 10

but i don't know my initial velocity!!

Answer 11

i was plannign on using Vf = Vi X a.t but i don't have the initial velo

Answer 12

Applied force - (Frictional force + Gravitational Force) = Net Force

Answer 13

ok?

Answer 14

what do i do with that?!?!?!? what will i get tho?!?!?!?

Answer 15

I think you have calculated the net accn wrong...

Answer 16

can you please take 2 seconds and go back and read 49b)

Answer 17

it's at the top.

Answer 18

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?

Answer 19

are you saying that i should have combined the frictional and gravitational forces?!?!?
Applied force - ""(Frictional force + Gravitational Force)"" = Net Force

Answer 20

yes that;s right!

Answer 21

Yeah, that's what i am saying !!

Answer 22

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.

Answer 23

No that's not true..

Answer 24

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?

Answer 25

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.

Answer 26

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?????

Answer 27

Read this
http://hyperphysics.phy-astr.gsu.edu/hbase/elev.html

Answer 28

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 :)

Answer 29

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.

Answer 30

ok Thanks and I Love you!!! Muuuuuha :"D
GOD BLESS YOU DEAR. Long Live!!

Answer 31

o_O
You're welcome..

Answer 32

:"D