Posts Tagged ‘Usain Bolt’

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2. Movie Stunt Math: Jumping off a Building

October 24, 2018

The main concern when jumping out off a building is that the airbag (cardboard boxes) cover the drop zone.

The maths calculations involved in jumping off a building are straightforward. You might like to check out How Maths Solved a real murder.

Jump Height that Kills

It doesn’t take much of a fall to cause damage. Sean Hughes, professor of surgery at Imperial College, London. Says “From a height of 3m you could fracture your spine,” he says. “At around 10m, you’re looking at very serious injuries.” (The Guardian, 20 MAY 2014)

Stunt Jump from building from standing start

1 stunt jump from building

As this jump – as in most base jumps – involves a standing start:

2 Mathspig Jump off building

Airbagsupplies.

Stunt jump from building running

We will assume you are no Usain Bolt. His running speed, the fastest in the world, is 44.72 km/h (12.42m/s, 27.44 mph).

We’ll say your running speed on take off is:

Vy = 15 mph = 24.1 kph = 6.7 m/sec

3 Mathspig stuntman running jump

Don’t do this at home.

NB: Airbag dimensions: 20m x 20m x 4 m

Handstand of death

Would you jump off a 25 story building?

 

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2. Stuntman Maths: Jumping off a Building

August 19, 2014

The main concern when jumping out off a building is that the airbag (cardboard boxes) cover the drop zone.

The maths calculations involved in jumping off a building are straightforward. You might like to check out How Maths Solved a real murder.

Jump Height that Kills

It doesn’t take much of a fall to cause damage. Sean Hughes, professor of surgery at Imperial College, London. Says “From a height of 3m you could fracture your spine,” he says. “At around 10m, you’re looking at very serious injuries.” (The Guardian, 20 MAY 2014)

Stunt Jump from building from standing start

1 stunt jump from building

As this jump – as in most base jumps – involves a standing start:

2 Mathspig Jump off building

Airbagsupplies.

Stunt jump from building running

We will assume you are no Usain Bolt. His running speed, the fastest in the world, is 44.72 km/h (12.42m/s, 27.44 mph).

We’ll say your running speed on take off is:

Vy = 15 mph = 24.1 kph = 6.7 m/sec

3 Mathspig stuntman running jump

Don’t do this at home.

NB: Airbag dimensions: 20m x 20m x 4 m

Handstand of death

Would you jump off a 25 story building?

 

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Woo! Hoo! It’s the Animal Olympics

September 30, 2011

Would a Cheetah beat an Olympic Cyclist?

Let’s find out …

The following table logs the fastest times recorded for various animals.

It’s like The Guinness Book of Records for Rats and other critters. Falcons do not fly at 350km/h at all times terrifying tourists. Nor does Usain Bolt race down the 3rd aisle at the supermarket in a few seconds.

This table compares the average speed of humans with the top speeds of animals. More info @ mistupid.

Animal  

MPH   

km/h   

Peregrine falcon

217

349.24

Swift

98

157.72

Cheetah

70

112.66

Pronghorn antelope

61

98.17

Wildebeest

50

80.47

Lion

50

80.47

Thompson’s gazelle

50

80.47

Quarterhorse

47.5

76.45

12. Cycling M 200m Sprint  Chris Hoy  UK   73.43 km/h

Elk

45

72.42

Cape hunting dog

45

72.42

Coyote

43

69.2

Gray fox

42

67.6

13. Cycling  W 200m Sprint V. Pendleton UK  65.67 km/h

Hyena

40

64.38

Zebra

40

64.38

Mongolian wild ass

40

64.38

Greyhound

39.35

63.33

16. Cycling M 1km Chris Hoy   UK  59.30km/h

Whippet

35.5

57.13

Rabbit (domestic)

35

56.33

Mule deer

35

56.33

Jackal

35

56.33

17. Cycling W 500m Anna Meares Aust  53.02 km/h

Reindeer

32

51.5

Giraffe

32

51.5

White-tailed deer

30

48.28

Wart hog

30

48.2

Grizzly bear

30

48.28

Cat (domestic)

30

48.28

Elephant

25

40.24

1. 100m M Sprint Usain Bolt Jamaica      37.15 km/h

2. 100m W Sprint  F. Giffith-Joyner  USA  33.91 km/h

Black mamba snake

20

32.19

Race runner (lizard)

18

28.97

8. 1,500m M Track   Noah Ngeny  Kenya  25.45 km/h

Wild turkey

15

24.14

14. Rowing M 8+   2000m  USA    22.50 km/h

9. 1,500m W Track  Paula Ivan  Romania  22.21 km/h

15. Rowing  W 8+  2000m   USA  20.27 km/h

10. Marathon M    Samuel Wanjiru    Kenya  20.02 km/h

Squirrel

12

19.31

Pig (domestic)

11

17.7

11. Marathon  W  Naoko  Takahashi   Japan 17.68 km/h

Chicken

9

14.48

3.  100m M Freestyle    Eamon Sullivan Australia 7.67 km/h

4. 100m W Freestyle  Britta Steffen Germany  6.77 km/h

6. 200m  M Butterfly   Michael Phelps   USA  6.44 km/h

5. 1500m  M Freestyle   Grant Hackett Aust  6.16  km/h

7. 200m  W Butterfly    Lui Zige  China    5.80  km/h

Spider (Tegenaria atrica)

1.17

1.88

Giant tortoise

0.17

0.27

Three-toed sloth

0.15

0.24

Garden snail

0.03

0.05

Now Mathpigs,

                              …………………………………………..

even though a chicken can move faster than, say, Grant Hackett swimming, it must be said that a chicken could not keep up that speed for 1500m!!! …………………

…..  And, even though a squirrel can run faster than Naoko Takahashi, I don’t think it could keep running for 42plus km!!

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Make me feel real loose like a long legged goose!!!

May 4, 2010

Everyone knows that women’s magazine editors digitally alter photographs of models that appear in their mags. When I finally did the maths I was shocked.  See: Odd Bods in Marie Claire

This model had legs 89% longer than a standard size 12 model in the same edition of the magazine and with the same waist to hip measurement! Looking at this model made the standard size 12 model look like a dumpy little garden gnome. Looking at these images distorts our view of normal body sizes or anything close to it.

Models can be given the appearance of long legs by the angle of the camera (Looking up at the model on the catwalk, for instance), by wearing extra high stiletto heels and/or by wearing bathing costumes with high cut legs. Then photo editors use photoshop to stretch their legs.

While pictures of male models may be digitally altered to remove skin blemishes, body hair and add abs, it seems to me that their legs are not digitally stretched and certainly not by 89%! But we have this 89% number now and we should use it.

So Mathspigs here are some male celebrities with a standard pic and then with their legs – from the hip down – stretched by 89%.

This was very simple maths. I used photoshop to edit the pictures and set their legs at a 189% vertical stretch. 

Check the maths:

Standard leg length = 100%

Vertical Stretch        = 89%

FINAL LEG LENGTH  = 189% 

Look at these pics and you decide if they look OK or ridiculous. I cannot decide for you. But I have thrown in the pics of the horse and the giraffe just to show how the practise of digitally stretching models images distorts reality. 

Here we go mathspigs. Lets play STRETCH LIMBO!!!!!!!!!!!!!!!!!!!!!!!!!!


Zac Efron

Maybe these

long legs would

help his

dancing, but…..  if he did the splits he’d never get up again.

Robert Pattison

plays

Edward Cullen

in the Twilight series. See TWILIGHT MATHS II

Edward is an ethical vampire

at this height he’d have to chase giraffes.

Justin Beiber

As my photoshop leg stretching skills improved

I found that

our eye begins to accept legs stretched

from the top of the thigh but not higher up the body.

Check out these stretch-horses.

Both images have legs stretched by

89% but the second horse has been stretched from the mid-body point down. Now look at the normal horse. It looks like it has SHORT legs!!!!!!! These images have distorted our sense of reality.


Here are some sports stars.

Sam Gilbert plays Aussie Rules football 

for ST KILDA.

PS: Mathspigs dad and two Uncles played for St Kilda.

My Dad broke his leg when he ran into the goal post. 

They sent him off to hospital using the local bus!!

This was along time ago.

My dad

and

two uncles

are in the

St Kilda team

photo 

together

in

1946.

Heath Grundy 

plays 

Aussie Rules 

Football 

for 

the 

Sydney Swans.

 

 Usain Bolt

 We would like to believe that Usain Bolt has long,

long legs.

 However he doesn’t need legs as long as the stretch photo suggest.

He is already the world’s fastest runner.

 

  The giraffe looks quite reasonable with extra long legs.

 Then again you could argue that

the real giraffe shape

is weird.

Now for a few rock stars.

 This is Vampire Weekend.

 The long Weekend is  Left.

Here is CUT OFF YOUR HANDS. 

Cut Off your Hands UNCUT is Right.

 This is the rock group GRIZZLY BEAR.

Look at the way our eye works.

Look at the guy in the shorts. His leg has been extended from the knee down. Looks wrong.

The guy in the black pants legs look OK even though extended 89%.

The guy squatting is totally distorted as his whole body and head have been stretched.

 Now you’ve seen a horse, a giraffe and a grizzly bear. 

Finally, a bit of fun.

Here are some fictional characters. 

Harry who???? The batman toy looks appears in proportion mainly because action figure toys are usually made with short muscly legs.

 

  – I used the standard 89% stretch here. I was hoping to give Spiderman legs like a spider.