Physics - June 2007

No, I'm not a moron, I know what fire is. I just want to know what type of matter it is, because it isn't light.

2007-06-26 13:54:41 · 5 answers · asked by Anonymous

Is mass the same thing as velocity? If not, what are the differences? I'm a physics grad student, so don't be affraid to use technical terms.

2007-06-26 13:45:36 · 13 answers · asked by Michael S 2

2007-06-26 13:01:03 · 11 answers · asked by Anonymous

I could look this up on google, Wikipedia or just a general search engine but I am trying to be moron in line with Yahoo rules.Please keep your answers suitably robotic and no chatty replies. This is Y/A please leave your brain and any contents at the door.

2007-06-26 12:55:36 · 7 answers · asked by Anonymous

Equipment to be used in airplanes or spacecraft is often subjected to a shake test to be sure it can withstand the vibrations that may be encountered during flight. A radio receiver of mass 5.21 kg is set on a platform that vibrates in SHM at 109 Hz and with a maximum acceleration of 93 m/s2.

a-Find the radio's maximum displacement
____meters

b-Find the radio's maximum speed.
____m/s

c-Find the maximum net force exerted on it.
____N

2007-06-26 11:42:42 · 4 answers · asked by Ciel S 1

A scale is fitted into the seat of a roller coaster car and a person weighing 860 N sits down on it. The car then descends along a path that has the shape of a 70.0 m radius vertical circle, with its lowest point at the bottom where the car reaches its greatest speed of 35.0 m/s. What is the maximum reading of the scale?
____kN

V^2/r gives you the a and you x that by the mass of the normal weight right....i get 1.5 kN kilonewtons? but its wrong

2007-06-26 11:37:01 · 2 answers · asked by long t 2

Abductin is an elastic protein found in scallops, with a Young's modulus of 4.0 106 N/m2. It is used as an inner hinge ligament, with a cross-sectional area of 0.73 mm2 and a relaxed length of 1.1 mm. When the muscles in the shell relax, the shell opens. This increases efficiency as the muscles do not need to exert any force to open the shell, only to close it. If the muscles must exert a force of 1.7 N to keep the shell closed, by how much is the abductin ligament compressed?

2007-06-26 11:35:27 · 3 answers · asked by salvnjc4ever 1

1) U-235 releases an average of 2.5 neutrons per fission while PU-239 releases and average of 2.7 neutrons per fission. Which of these elements would you expect to have a smaller critical mass?
2) Fermi's original reactor was just barely critical because the natural uranium that he used contained less than 1% of the fissionable isotope U-235 (half life 713 mil. years.) What if, in 1942, the earth had been 9 billion yrs old intead of 4.5 billion years old? Would Fermi have been able to make a reactor go critical with natural uranium?
3) If uranium was split into three segments of equal size, instead of two, would more or less energy be released? Why?
4) Why is there, unlike fission fuel, no limit, to the amount of fusion fuel that can be safely stored in one locality?

2007-06-26 11:26:15 · 2 answers · asked by Anonymous

Dimentions of the brick are 12" x 6" x 3".

If rotating brick is thrown in air,
the axis of rotation will remain in the same orientation
with respect to both the brick and stationary observer,
if, for example, the brick rotates around it longest axis.

2007-06-26 11:21:18 · 3 answers · asked by Alexander 6

They can see the future
but do you belive it?

2007-06-26 11:08:17 · 12 answers · asked by Peruvian 1

A LCR circuit consists of a coil with an inductance of L=0.3 H and a capacitor with a capacitance of Csub1= 5X10^-6 F.
a) What is the resonant frequency of that circuit?
b) How much is the change in period of oscillation if instead the capacitor Csub1 uses the other capacitor with a capacitance of Csub2= 5X10^-8 F?

2007-06-26 10:33:26 · 3 answers · asked by LesJerLayne 2

2007-06-26 10:25:45 · 6 answers · asked by marinesista84 1

2007-06-26 09:48:04 · 5 answers · asked by Anonymous

4) There are 13 men in a closed room. The man that has placed them there has given them each a ring box with either a bean or a diamond in it. These men can show every other person their box, BUT CAN NOT SEE WHAT THEY HAVE THEMSELVES! There is NO communicating between the men (no sign language NOTHING). The man that has placed them there said that in order to live they must get all the people with the diamonds in their box out of the room and all the people with the bean in their box in the room. (ex. Chance one: all of them exit the room). Each time they are wrong the man who has placed them there will let them know they are wrong and they all must keep trying. The man has given them 11 chances. You must assume that all the men are thinking the same STRATEGY! The men in the room happen to get it in 7 tries! Explain the strategy they used to have done this.

2007-06-26 09:33:25 · 2 answers · asked by asabree1991 2

Just checking...
Everything in our universe is composed of bosons and fermions.
Fermions consist of leptons and quarks.
The quarks are the red, green, and blue flavors of the up, down, strange, charm, top, and bottom quarks, and the antimatter counterparts of each of these.
The leptons consist of electrons, tau particles, and muons, and the neutrinos corresponding to each of these, and the antimatter counterparts of all of them.
Bosons are the force carriers, the photon, (hypothetical) graviton, w+,w-,z bosons, gluons, and (hypothetical) higgs bosons.

All of these particles interact through the 4 fundamental forces, electromagnetism, gravitation, the strong nuclear force, and the weak nuclear force.

Is that correct?

2007-06-26 09:21:42 · 5 answers · asked by Anonymous

i am shooting a pellet vertically. the whole journey takes 16.5 seconds. how many metres did the pellet reach before it turned round and fell under gravity?

when the pellet turns around it must be stationary and then fall under gravity at 9.8ms^2 so can the height the pellet reached be calculated from only knowing the time for the whole journey?

thanks

2007-06-26 09:07:27 · 17 answers · asked by Anonymous

A 25 kg block is at rest on a 18 degree incline...What is the force of static friction between the ramp and the block?...what is the coefficient of static friction between the ramp and the block?

All help is appreciated

2007-06-26 08:11:41 · 4 answers · asked by Anonymous

1.At any instant the momentum of the planet is tangent to the planet's trajectory.
2. At every instant, d/dt points from the planet to the star.
3.The gravitational force on the planet due to the star always acts at a right angle to the planet's momentum.
4.The direction of the planet's momentum is changing at every instant.
5. The magnitude of the planet's momentum is constant.

2007-06-26 08:10:26 · 5 answers · asked by Ashley 2

I've searched Wikipedia high and low, and it is too difficult to understand what exactly color charge means. I know that gluons have the ability to make other particles change color, but what does changing color do? How does it change the properties of quarks, and other subatomic particles?

I really want to understand subatomic physics but everytime I try to read a page of it on Wikipedia, it uses terms that I have to look up in Wikipedia, creating a cycle of confusion. So please, I need help from an experienced physics expert.

Great thanks to whoever helps me understand this.

2007-06-26 07:54:03 · 3 answers · asked by Jimbomonkey1234 3

a particle is thrown vertically upwards.if its velocity at half the max.height is 10m/s,then max.height attained by it is?(g=10m/s^2)

2007-06-26 07:26:58 · 4 answers · asked by Anonymous

If you pitch a baseball with twice the kinetic energy you gave it in a previous pitch, the magnitude of its momentum is? I'm looking for how much greater it is, via a factor, such as 2 times greater.

2007-06-26 07:14:06 · 3 answers · asked by mentallyatrophic 1

There are four people on a bridge at night. It is PITCH BLACK nothing can be seen without a flash light. The four people are on the bridge with only ONE flash light. All four of these people must cross this bridge and end up on the other side together. When crossing the flashlight must be taken across and be brought ALL THE WAY back to be used again. The bridge only allows for 2 people to cross at a time. These four people all get across at a different rate of time. The first person takes ONE MINUTE to get across, the second person takes TWO MINUTES to get across, and the third person takes FIVE MINUTES to get across, and the fourth person takes TEN MINUTES to get across. The two people that are crossing must cross at the SLOWER persons pace (ex. If one and ten crossed, it would take ten minutes, and some one would have to bring the flash light back). You must find a way in which all four of these people end up on the other side of the bridge TOGETHER, in less than 18 MINUTES!!!

2007-06-26 07:13:31 · 3 answers · asked by asabree1991 2

????????

2007-06-26 05:29:37 · 16 answers · asked by Anonymous

2007-06-26 05:00:34 · 12 answers · asked by sam 1

What do you think will happen to the human body if exposed to higher gravity that to that of earth? Like if I were to be exposed to 0.5g(gradually increased as I progress) for a long period of time, and then came back to earth. Will I have gained super human strength? Or will the human body fail to adapt?

What are your thoughts?

2007-06-26 04:55:41 · 7 answers · asked by That_guy 4

2007-06-26 04:02:28 · 8 answers · asked by Anonymous

A. radioactive dating
B. Transmutation
C. Electromagnetism
D. radioactivity

2007-06-26 03:50:42 · 2 answers · asked by Amber 1

A. low frequency
B. High frequency
C. small amplitude
D. large amplitude

2007-06-26 03:47:48 · 5 answers · asked by Amber 1

2007-06-26 03:34:47 · 14 answers · asked by Lady Tam 4

The 'net force' in the statements below is the sum of ALL forces acting on the body. True or False
1. During the collision of a locomotive with a car, the car exerts an equal size force on the locomotive as the locomotive exerts on the car.
2. An object's velocity will change if a net force acts on the object.
3. If two objects are under the influence of equal forces, they have the same acceleration.
4. The net force which acts on an object which maintains a constant velocity is zero.
5. If a net force acts on an object, the object's speed will change.
6. In order not to slow down, a truck moving at a constant velocity needs a small net force applied.

Explanations would be good too :) Thanks

2007-06-26 02:54:31 · 7 answers · asked by Anonymous