Sunday, September 27, 2015

The Physics of Superheroes by James Kakalios Ch.1 "Up, Up, and Away!"

Ever wondered of how Superman and his powers work with actual physics. Well back when he was only a comic book character, remember how it was said "He could leap tall buildings in a single bound"?

Question is how high he could actually leap then. His range was 660 feet, what he would need in velocity to make that height to jump off from the sidewalk to get to that max height. With his final velocity, at 660 feet,which will be 0. Meaning his initial velocity would be 140 miles per hour is what will determine his highest point. Superman also weighs 220 pounds and his mass is 100 kilograms. The force of gravity remains constant through the entire event. With his initial speed, the force of gravity, and the max height that he can leap, how do you explain how he can reach that velocity in a leap?

Thou he crouches and pushes back on the ground, he is still effected by the force of gravity along with his mass and acceleration. This is where you take in the account that he is not earth born, but from the planet Krypton, where the gravity is much stronger. Superman's DNA made his muscles and body to survive the force of gravity on Krypton his home planet, so just much stronger is the force of gravity on Krypton?


If we say that Superman weighs about a 100 kg in mass, then force is equal to 100 kg in his mass times his acceleration of 250 meters/sec^2. Then the force he produces for the vertical leap is 5600 lbs. Supposing that his amount of force is 70% then what his legs could actually supply, Superman would have weighed 3,300 pounds on Krypton. His mass is constant even on different planets. So saying that he weighed 220 pounds on Earth and 3,300 pounds on Krypton, with the acceleration and the gravity on Krypton, the force of gravity on Krypton would have been 15 times greater than on Earth. Meaning this difference in gravity allows him to be able to generate the force needed to leap a 660 foot building while having the initial velocity of 140 miles per hour with a simple crouch jump.

Source:
The Physics of Superheroes by James Kakalios
Chapter 1, pages 21 - 32
Published by "Gotham Books"

Kakalios, James. The Physics of Superheroes. New York: Gotham, 2005. Print.


Sunday, September 20, 2015

Are we really prepared for "Armageddon"?

This week in the Physics in Film class, we watched Armageddon. The story is on the Earth about to come in contact with an asteroid that would destroy the planet. So they came up with the plan of using a nuke inside the asteroid and cause it to be made into 2 pieces of asteroid of "iron ferrite". They had to dig into the asteroid and blew up a nuke. For this week, I choose to do research on some physics behind the HAIV or Hypervelocity Asteroid Intercept Vehicle. It consists of two main part. The Leader and the Follower (Nuke Body). The Leader is an extended sensor that is to be used as a initial detonator to created a crater for the Follower. The Follower is a nuke with a 1500 kg payload capable of 6.276x109 Joules. The purpose of the HAIV is not to destroy asteroids but to re-direct them away from Earth. The total mass of the HAIV is 4242 kg. 






The main question is whether Earth is really prepared for what could be a Planetary disaster that could happen. The majority shows that in time we'll have to wait and see when the time for a real life Armageddon comes our way. 

Sunday, September 13, 2015

Eraser and the Physics Defying Railgun!

This week we at the Physics in Film class, we watch Eraser from 1996 with star, Arnold Schwarzenegger. We will be using the scene the railgun is first used in the movie. It was where the gun was used to kill Lee Cullen's ex stalker boyfriend (Mr. break into the house and take a shower while I wait).  When the ex-boyfriend was shot, he was heading to get down *insert Arnold saying "GET DOWN" here* and when he was hit, he flew back and was pinned against the wall. Railguns known for their penetration power and in this movie "known to shoot bullets at the speed of light" wouldn't have pinned the guy against the wall. At the same time, we have to see how the sniper was able to shoot the gun with barley any recoil to it at all. *Seems like bologna to me*

For this I analyze what was need for this.
I looked for the average of humans (80.7kg), of assault rifles (3.99 kg), and of an average bullet (0.00454kg). I looked and estimated some of what was need for the velocity of each object, most almost not having much or any at all. If the shooter shot the railgun with no or minimal recoil, means that it didn't move him or changed his velocity which consisted of 0 m/s. If the bullet went at the speed of light then it's velocity would have been 299,792,458 m/s. The boyfriend stalker was falling to the ground so I estimated his speed at .46/m which is close to 3 mph. Using these I would find the momentum of the bullet and see where the energy carries on for both the shooter and for the stalker boyfriend.



After seeing the work, you should be able to tell the the energy from the railgun being shot, should have given a strong amount of recoil, that should have either sent the gun flying and maybe even the shooter too.

As for the boyfriend, he shouldn't have been pinned to the wall as he was. The bullet would have broken through the body and kept going. It is quite possible that it could have vaporized the body, leaving a giant hole, or maybe even nothing at all. The body would have also gone farther in distance compared to the distance he flew from where he was to a wall that was about maybe 3 meters away.

Seeing the analysis, the movie defies Physics and isn't accurate to an actual railgun that in this current day can only shoot bullets at the speed of 2500 m/s. The only real railgun that we've seen was the one from the Navy, which shoots aluminum rounds that are the size of about 70 mm rounds (guess/estimate). 

Sunday, September 6, 2015

Mission Impossible III

1) Ethan Hunt swinging from one building to another.

Could a person actually make that swing from one building to another?
- Distance between each building. Length of rope used to swing. Speed of Hunt as he swung as.
The distance between the buildings, I would like to say that they were about 40-50 meters. The length of rope would have to be from about around the same amount of about about 60 or more meters long to make the swing and be able to get atop of the roof. As for how fast Hunt ran, the average speed of a human is what is used which is 12 m/s, but doesn't account for the equation for a freefall, that takes in the account of gravity. -9.81 m/s ^2

2) Magnet of thrown explosive

Can the magnet of a small hand explosive really make that giant curve onto the steel beam it landed on?
- Distance away from the steel beam. Distance of any other metal that was closer to the magnet. The scene was quick to picture but I estimate the furthest the explosive was from beam was about 3 meters away, while it was closer to a random flat shaped box of metal materials by about half a meter away.

3) Explosion that exploded behind Hunt, but launches to the left.
Distance from the explosion. Speed of Hunt. Hunt runs about 6 meters from the explosion while sidetracked from getting the gun from the trunk. Average human sprint is about 12 m/s, but half if sidetracked and injuried with pain. The force of the explosion would have needed to come from the left not from behind.