Most people think of magnets as a solids. But, think again. A "liquid" form of magnet exists.
Ferrofluids contain magnetic particles in a liquid carrier, and act like a "liquid magnet." Ferrofluids do not clump together to form solids because of a surfactant, which coats the magnetic particles. The surfactant overcomes the magnetic forces between the particles and keeps the solution a liquid. A ferrofluid is primarily made of a liquid carrier, and contains relatively small amounts of magneti
Around the holidays, people typically gain weight as cookies, candy canes, and other treats are around every corner. But, this Christmas, you can lose weight! Without a diet, and without exercise, there is one answer to the essential question: "How can I lose weight?" Simple. Go to the moon.
Here is the calculation to prove this solution really works!
1) Find g:
g=[G(mass of moon)]/[(radius of moon)^2]
g=[6.67x10^(-11) x 7.35x10^22]/[(1737000 m)^2]
g=1.62 m/s^2
2) Conver
Don't let four-wheel drive fool you, because any car can spin out on icy, snowy turns. In wintry weather, drivers must slow down or shovel their way out of a snow bank. Why must drivers slow down? The coefficient of friction between rubber tires and snow is much less than the coefficient of friction between rubber tires and dry pavement.
The coefficient of friction between pavement and tires is about 1.00; whereas, the coefficient of friction between snow and tires is about 0.30.
So, how muc
Opening a fresh jar of pickles can be challenging. If you are somebody who struggles opening jars, don't be discouraged, physics can help. If you run the jar under hot water, the lid will become easier to turn. But, why? Metal has a higher coefficient of expansion than glass does. So, as the jar stays under the hot water, the metal expands a tiny bit, and the glass stays the same. There is no longer a need to workout, just run your tricky jars under the faucet, wait a minute, and let physi
Population concerns on Earth are leading scientists to inquire whether colonizing Mars is possible. As of now, over 78,000 people have applied to leave Earth forever and live on Mars. Mars One, a nonprofit organization, is sponsoring the colonization with a take-off date sometime in 2023. Out of the applicant pool, four will be chosen to send first to Mars. The first four will lay the groundwork for a permanent colony. Two years after the first four land, Mars One would send up more people to th
A couple games ago, my soccer team had ample opportunities to score against Gates Chili. We managed to sky the ball over the net from the six yard line, in the first five minutes of the game. After thinking about how hard it is to miss the goal from this distance, I thought I would compute the angle, theta, needed to clear the crossbar (8ft off the ground) from the 6-yard line. Given:
*average velocity of shot ~45ft/s
(this value varies between male/female, and level of play)
*delta x=18ft
*
After laying low for awhile, cross products have suddenly became very important in our current independent unit on Magnetism. For those who may have forgotten how to find a cross product, here are some reminders.
1. Cross products are needed when the multiplication of vectors is involved in the problem
2. To find cross product of a x b [where a is (ax,ay,az) and b is (bx,by,bz)]
cx=(aybz-azby)i
cy=(azbx-axbz)j
cz=(axby-aybx)k
3. The cross product is then written:
a x
Circuits with resistors:
In series:
Req=R1+R2+R3+R4+...
I=I1=I2=I3=I4=...
V=IR1+IR2+IR3+IR4+...
In parallel:
1/Req=1/R1+1/R2+1/R3+1/R4+...
I=I1+I2+I3+I4...
V=V1=V2=V3=V4=...
Note: Replacing resistors in parallel with one resistor of equivalent total resistance is very useful when analyzing circuits
Circuits with capacitors:
In series:
1/Ceq=1/C1+1/C2+1/C3+1/C4+...
Q=Q1=Q2=Q3=Q4=... (Conservation
If you ever find yourself in Las Vegas with nothing to do, $100 to burn, and gambling isn't your forte, head over to the Stratosphere Casino/tower.
At the Stratosphere, you can experience the thrill of free fall as you descend 108 floors to the ground. After taking the elevator to the top of the building, you receive a brief "safety lesson." Then you saddle into the harness, say a prayer, and jump! (Ok, this isn't true free fall. A long cord is attached to your back which slows you down for th
What are oscillations equations without gravitation equations?
Gravitation:
T12/R13=T22/R23
G= 6.67x10-11
g=Gm/r2
Fg= -Gm1m2/r2
Potential Energy= -Gm1m2/r
Vorbit= [Gm1/R]1/2
Vescape= [2Gm1/R]1/2
T=(2(pi)R)/v
Total energy for a circular orbit= (-Gm1m2)/(2R)
Total energy for elliptical orbit= (-Gm1m2)/(2a) ; a= major axis radius
Velocity/Radius relationship for elliptical orbits: vprp=vara
Overall, there aren't too many equations to remember for this topic. But, all of the equatio
This is my first blog post with nothing to do about soccer! Tonight, when my dad was reading the Democrat and Chronicle, and I was doing my Calculus homework, he read me a blurb about an American and French Physicist who just won a Nobel Prize in Physics. The paper didn't explain much of anything in terms of what these physicists did to merit the prestigious award. I think the brief description was because the physicists, Serge Haroche and David Wineland, studied quantum physics and applications
In college, I plan to major in biomedical engineering. Biomedical engineering combines biology, chemistry, physics, and math into one field of study. The field is very broad; so a biomedical engineer usually focuses on one specialization, some of which include medical imaging, biomechanics, bioinstrumentation, genomics, robotics, clinical engineering, tissue engineering... I am not sure which specialization I will follow yet; however, I think that tissue engineering is extremely fascinating. Tis
As Thanksgiving is just around the corner, retail stores are bombarding consumers with Black Friday ads. The ads show glittery, appealing products at low-prices. But, what the ads do not show--crowded parking lots, irritated customers, and stampedes-- you must watch out for. To minimize your risk of injury, here is some physics advice if you are one of the bold buyers who battles Black Friday crowds.
1) Attempt to maximize your power (force dotted with velocity) beforehand. A balance of
As we are in our second independent unit, I thought I little review picture couldn't hurt. Remember:
1.) Max acceleration is achieved when the spring is at -amplitude or +amplitude.
2.) Max velocity is achieved at equilibrium.
And, along with this, we must know:
KE= (1/2)kA2sin2(wt) w= angular frequency, k= spring constant, A= amplitude, t= time
PE= (1/2)kA2cos2(wt)
These equations are useful when finding the Potential or Kinetic Energy at time, t, in the oscillation.
So, this first blog entry is an introduction to me, goalkeeper0. As seen in my username, I obviously am a goalkeeper (for soccer)...I will soon post a blog entry about a recent soccer/physics encounter of mine. So, about me. I am interested in a combination of all three sciences, Biology, Chemistry, and Physics. Thus, in college, I hope to study biomedical engineering-- which brings together both engineering and medicine. Biomedical engineering appeals to me, because of its many different career
