Question

Simple question help


A balloonist happens to drop his metal ballpoint pen from his balloon as he is taking notes on his flight. Because his pen has a streamlined shape, air resistance has little effect on its fall. The pen strikes the ground at 22 m/s. How high was the balloon?

Answer 1

i don't understand what its saying, how high was the balloon? like a hot air balloon and how do i do this

Answer 2

You can find the distance in the y direction with a kinematic equation because you know the velocity came from rest initially and landed with 22 m/s and you know that acceleration due to gravity is -9.81m/s then you can find the height.

Answer 3

yes i know the 9.8 m/s but i dont understand how you find the time it takes so i can find it i dont know how it can go up to 22m/s

Answer 4

and i don't know what equation to do

Answer 5

Using this equation you don't need time. vf^2=vi^2+2aΔx. You are looking for delta x and you know that vi is zero.

Answer 6

;-; i'm confused

Answer 7

So putting in the information that you have and solving for delta x you get: x=24.66 meters

Answer 8

OH I HAD THE FINAL VELOCITY I FORGOT

Answer 9

Yep! you got it! Good luck. Im taking physics right now and it's hard!

Answer 10

what is the formula for kinetic energy?

Answer 11

i have been struggling with physics for years, i took it last year and im homeshcooled so my teacher isn't really helping :/ his only tutoring time is at 5 am and he has like 50 kids in there and i can't really ask questions

Answer 12

Kinetic Energy= 1/2 m (v)^2

Answer 13

Im in college so you are ahead of me! keep up the hard work it doesn't come easy. you got this!

Answer 14

thanks friend

Answer 15

Absolutely! Any time!

Answer 16

mind helping me with another question then?

Answer 17

. A 10.3 kg block of ice slides without friction down a long track. The start of the track is 4.2 m higher than the end of the track, and the path traveled is 8.0 m. Find the speed of the block when it reaches the end of the track.

Answer 18

hello o.o

Answer 19

Oh yikes. I feel like there is some information missing. Maybe theta? the angle of incline? Otherwise I solved it using the equation from earlier and I got a massive final velocity of 82.40 and I don't think that is right. Because we don't know the force applied if any and we can't split the mg into their components which is necessary for the incline problems, or theta we need more information, I think. Also I got the physics for dummies workbook and that helped alot.