## Motorcycle Jump

The film, Mad Max Fury Road, is known for its action scenes and stunts.  One of the stunts shown in the film is a classic motorcycle jump.  The bad guys are trying to kill Max and his crew so they repeatedly jump over his truck and drop bombs on it.  The truck is about 4 meters tall and the jumps are at a 45 degree angle.  What is the velocity required to clear the truck?

### Units:

#### Acceleration due to Gravity = -9.8 m/s^2

First we need to find the time.  The easiest way to do this would be to use symmetry.  It should take the same amount of time for the motorcycle to reach the maximum height as it would for him to fall back down to the ground.  So with that logic if we use this equation ---> Yf = Yi + Vi,y + 1/2 ay t^2
We should be able to find the time by replacing Yf with 0 m for the ground, Yi with 4 m for the top of the truck, and Vi,y with 0 m/s due to the fact that it is at the height of the jump.  The equation should look like this now ---> 0 = 4 + 0 + 1/2 (-9.8) X^2

With the use of some quick Algebra, we find the time for one half of the jump to be 0.9 seconds.  Now that we have this knowledge, we can plug the numbers into this equation to find the initial velocity in the Y direction --->  Vf,y = Vi,y + ay t
If you plug in the numbers then it should look like this --->  4 = X + (-9.8)(0.9)

We should find the value of the initial Y velocity to be 12.82 m/s.

Then we plug those numbers into this equation to find the initial velocity ---> Vy,i = Vi sin(angle)
It should look like this --->  12.82 = X sin45

Then we get the initial velocity to be 18.13 m/s.  The motorcycle has to be going at 18.13 m/s to make the jump over a 4 meter tall truck.  However, it is true that the stuntmen probably want a wide gap between themselves and the truck during the trick, so they would probably go a little faster to get a safer distance from the truck.  They most likely went at a minimum speed of 20 m/s if I had to guess.

## Contact Messed Up What Interstellar Got Right

Time starts to act weird when you move fast.  When you reach a speed close to the speed of light, you will experience time slower than everyone else.  Basically you travel into the future.  It's a neat idea that some movies try to portray like Interstellar.  Contact tried to do it too and they even mentioned relativity in the film, however, they got it wrong.  When the lady did her space magic she was supposed to feel less time than everyone else.  Instead she felt more time.  What was less than a second to them was eighteen hours for her.  It should have been reversed.  If the movie wanted to be correct then it should have made her travel into the future when she came back.  She should've been the same age while everyone else turned to old people or corpses.  Interstellar got it right tho.

## What it Takes to Slaughter

War sucks.  Nobody likes it.  The people who do like it don't realize that being shot at sucks.  The fighting is not over till it's over.  If you want to end a war you must trap the enemy and make surrender their only option.  You must make sure their is no argument that you are the winner.  When WWII was coming to a close, the Japanese were the last ones still fighting.  They were annoying to deal with and we were in their territory.  If we wanted to end the war, we would've had to pull off a mainland invasion.  It would've been a bloodbath.  Some nerds made a new kind of bomb however.  They dropped a couple on Japan and that was it.  The end of the war.  Japan surrendered and now they just make TVs and decent cars.  The problem was however, these bombs were used primarily on civilians at the time.  Also, these bombs were nuclear and poisoned any survivors with radiation.  It wasn't nice.  If the war had continued, many more people would have died.  It sucks that civilians got caught up in something so terrible, however, they didn't care about civilians getting caught up in Pearl Harbor either.  Revenge is a lazy excuse, but it ended the war so it was worth it.  As far as Gojira goes, if they didn't kill Gojira then it would've continued killing.  The weapon that was used to kill Gojira was super dangerous.  However, even if the scientist did keep it hidden, someone else would've made something just as crazy later.  That's assuming that nobody hadn't already made something even more dangerous.  In conclusion, it was worth it.

## Spiderman is Still Cool

### "The Physics of Superheroes"

Spiderman can do whatever a spider can.  It's pretty self explanatory.  This includes swinging from a web.  The author asks whether or not Spiderman could actually swing from a web like a spider can.  As soon as I read this I already knew the answer.  YES HE CAN!

The strongest thread known to humans is in fact spider silk.  If you had an entire rope made from the stuff then there is no way that it would break.  Spiderman has a higher chance of losing his grip compared to a spider silk cord snapping.  That stuff is MUMBO STRONG.

Since Spiderman is swinging in a semi circle, he is experiencing acceleration.  He is always changing direction which means he is always changing velocity.  Bang boom that's the basics of centripetal force.

Now that the explaining is done, lets get to the meaty bits.

#### The Math

T = mg + (mv^2)/r
g = gravity
r = radius of his swing or the length of his webs
v = velocity of Spiderman
m = mass of Spiderman

If you assume that Spiderman is 76kg and the webbing is 200ft (61m), we would arrive at around 300 pounds of tension.  It's still not enough.  Spider silk is 5 times stronger than a steel cable.  If Spiderman is using real spider silk then he has nothing to worry about.  I honestly feel bad for the people he ties up in that stuff, they probably never get out.

The author also mentions some stuff about the scientific possibilities of spider silk.  No lie, 60 minutes already did a segment on spider silk and it was really cool.  I highly recommend it.

Final conclusion is that Spiderman is still cool and now he is somewhat realistic.  Let's forget about Spiderman 3 though...  Seriously, it was bad.

## Tuesday, September 26, 2017

### Space Jam Grand Slam

Lets be real here dudes.  If a meteor just showed up without crazy amounts of warning, we'd be super dead.  I don't mean just dead.  I mean ultra dead.  Out bones would be the next thing to be picked up by whatever takes over after the monkeys and then smashed into other bones.  The key to dealing with a meteor has nothing to do with power.  We need time.

#### The Problems

The rock will kill us when it hits.  That is assured.  Most people would just go with "Nuke the rock till it's gone."  However if we nuke the rock, it'll only break into smaller rocks.  Mass is never destroyed or made, only changed.  If the rock is broken up then we now have a buckshot effect instead of a slug round.  We would get showered in smaller rocks.  If the rocks are small enough then they should burn up in the atmosphere.  However we can't say with certainty that all of the rocks will be small enough for this to happen.  After thinking on it, I've come to the conclusion that blowing it up isn't all that good of an idea.

### The Solution

We are left with two good options.  Run away or we change the coarse.  We can change the coarse of the meteor if we have enough time.  With time on our side then I believe that if we pelt the rock with matter over time, it should change coarse.  I suggest either we smash one big piece of junk into it once, or we smash small pieces over time.  We can probably just take a bunch of trash from dumps and landfills and launch it into the rock at a perpendicular angle over a long period of time.  Hopefully the repeat force should be enough to nudge it over so it misses.  However this plan requires time over anything else.  If we run out of time the we die.  Well running out of time is a metaphor for dying so I guess that a given.  At the rate we're going I think World War III will get me before any space rock does.