## Profile

Matt Hilbert

12,989 views

AboutPostsPhotosYouTube

## Stream

### Matt Hilbert

commented on a video on YouTube.NEWS ARTICLE ON SUBJECT--

http://www.businessweek.com/ap/2012-04/D9U8PJU01.htm

http://www.businessweek.com/ap/2012-04/D9U8PJU01.htm

1

Add a comment...

### Matt Hilbert

commented on a video on YouTube.Moar of this and less Simple Simon

8

Add a comment...

### Matt Hilbert

Discussion - Text required! -I challenge people to do photography other than bugs and flowers!

3

5 comments

Perhaps a theme of the week?

Add a comment...

### Matt Hilbert

commented on a video on YouTube.DETAILS OF THE FALL-

The iPad fell from about 100,000 or 30500m (meters). This definitely gives it enough time and distance to reach terminal velocity.

The iPad surface area is 44,790mm squared. We will add some because of the mounting bracket and the camera and all of that. So we will make it 50,000mm squared.

The acceleration of Gravity is 9.80665 m/s/s (or meters per second squared). Using [v=sqrt{2gd}], it's speed in m/s (meters per second) is 773.438. Now this doesn't take surface area into account. Because this gives us a speed of about 1730mph. That is over mach 2 and is outrageous. So we will disregard this calculation entirely.

Drag coefficient is calculated by the shape of the object. The object a rectangular prism, but the bag it is in provides some angles. So does the cylindrical mounting bracket. And the camera is kind of a square, so the average drag coeffient of all three of these shapes (and we will add a bit to compensate for the popped balloon) comes out to be about 1.5.

Vterminal=sqrt{(2*mass*gravity)/(density of air*projected area*drag coefficient)}

Average air density~ 1.3 kg/m cubed

Mass= .73 kg

Drag Coefficient~ 1.5

Projected area= 50000mm squared

Accel due to gravity= 9.80665m/s/s

The answer comes out to be 10.2417 m/s. When converted into mph, it equates to a speed of 27.11mph. Looking at the footage, that seems about right.

The iPad fell from about 100,000 or 30500m (meters). This definitely gives it enough time and distance to reach terminal velocity.

The iPad surface area is 44,790mm squared. We will add some because of the mounting bracket and the camera and all of that. So we will make it 50,000mm squared.

The acceleration of Gravity is 9.80665 m/s/s (or meters per second squared). Using [v=sqrt{2gd}], it's speed in m/s (meters per second) is 773.438. Now this doesn't take surface area into account. Because this gives us a speed of about 1730mph. That is over mach 2 and is outrageous. So we will disregard this calculation entirely.

Drag coefficient is calculated by the shape of the object. The object a rectangular prism, but the bag it is in provides some angles. So does the cylindrical mounting bracket. And the camera is kind of a square, so the average drag coeffient of all three of these shapes (and we will add a bit to compensate for the popped balloon) comes out to be about 1.5.

Vterminal=sqrt{(2*mass*gravity)/(density of air*projected area*drag coefficient)}

Average air density~ 1.3 kg/m cubed

Mass= .73 kg

Drag Coefficient~ 1.5

Projected area= 50000mm squared

Accel due to gravity= 9.80665m/s/s

The answer comes out to be 10.2417 m/s. When converted into mph, it equates to a speed of 27.11mph. Looking at the footage, that seems about right.

2

Add a comment...

### Matt Hilbert

commented on a video on YouTube.The disadvantage of being left-handed. It's almost like a bit of suspense waiting for the hand to move out of the way so you can read it.

1

Add a comment...

### Matt Hilbertowner

Discussion - How many of you guys are a staff member at an NYLT course? I am

1

2 comments

I am with the Iroquois Trial Council. It's my 3rd year on staff. We have in the past, but last year we didn't send anyone

Add a comment...

Links

YouTube

Links