Physics - January 2007

1) In their first sets of trials, they had problems because the fuel (propellant) was too_____ and it would ______ the rocket body.

2) The boys worked as a team to find the most ideal fuel for the rocket. That turned out to be pure ______ mixed VERY CAREFULLY with other fuel components to make a thick rubbery material.

3) Not only did the boys launch the rockets but also they collected data such as _____________________________________
_____________________________________

4) Why did they collect this data?___________
______________________________________
______________________________________

5)How did it eventually work toward their advantage?

6) What factor was not caculated in determining the location of the lost rocket?

7) The kids won the regional science fair, but what happened at the state championship?

2007-01-08 13:48:53 · 2 answers · asked by docjnt@sbcglobal.net 2

Hi,

I am confused a bit on how to start this one:


Two 3.0 g spheres are suspended from the ceiling on a 1.0m-long rope with each sphere being on a different rope. The two ropes are suspended from the same point on the ceiling. The spheres repel each other after being equally charged. When the spheres repel each other, the rope they are attached on forms a 20 degree angle with the y-axis in each case. So there is a total of 40 degrees apart between the spheres. What is the charge of the spheres?

I am assuming I have to use F = (kq)/r^2 but I am a bit confused as to where to go from there. Any ideas?


Thanks

2007-01-08 13:39:23 · 2 answers · asked by Anonymous

2007-01-08 13:05:58 · 2 answers · asked by Skittles 2

2007-01-08 12:53:20 · 9 answers · asked by Anonymous

sorry, this question is just for fun. unless you can teleport.

2007-01-08 12:31:48 · 5 answers · asked by ? 2

What is the process to produce a neutron that strikes a U-235 nuclei and produces nuclear fission?

2007-01-08 12:31:12 · 7 answers · asked by Zulu 12 2

If x is inversely related to y, then that means that if x increases, y decreases? It means that x=z*1/y, right? Or is it more accurate to say that that's a negative relationship?

I'm trying to tell whether mass is inversely related to acceleration in the formula a=f/m

2007-01-08 12:22:49 · 3 answers · asked by MLBfreek35 5

how do i convert from kelvins and to kelvins?

2007-01-08 12:21:23 · 2 answers · asked by bhangraking777 1

2007-01-08 12:19:27 · 9 answers · asked by Funk Master 4

What would happen to an element if the polarity of it's Protons and Electrons were reversed?

2007-01-08 12:19:04 · 4 answers · asked by Anonymous

An explosion breaks an object into two pieces, one of which has 1.5 times the mass of the other. If 7100 J were released in the explosion, how much kinetic energy did each piece acquire?

NOOO idea... help, please??? Thanks in advance for your time and help.

2007-01-08 12:02:42 · 3 answers · asked by abc123 1

2007-01-08 12:02:37 · 7 answers · asked by water yu 3

I've heard or read somewhere that if you take a glass/cup, like for drinking from, and put the open end up against a window or door and put your ear against the bottom of the cup, you can hear conversations really clearly that are taking place on the other side of the window.

2007-01-08 12:00:22 · 3 answers · asked by Nameless 2

2007-01-08 11:59:49 · 1 answers · asked by water yu 3

I'm looking to find a list of accepted coefficients of friction for common materials like wood-wood, plastic-wood, PVC-PVC, etc. Any help would be appreciated.

2007-01-08 11:55:18 · 2 answers · asked by Ghidorah 3

When you thermally excite an electron to a higher energy level, it quicky comes back to its ground state by realeasing its energy in the form of a photon(s).

We all, I assume, accept this fact. But does it make sense? How does the electron do that? I thought that the electron was an indivisible particle without any volume. Then how can it emit a photon?

2007-01-08 11:53:53 · 3 answers · asked by Anonymous

2007-01-08 11:50:48 · 2 answers · asked by necro 3

2007-01-08 11:47:32 · 5 answers · asked by M.K 2

2007-01-08 11:44:37 · 6 answers · asked by ? 5

Does light(photons) have 0 mass or infinite?(b/c it its mass would be zero, it would take no energy to slow it down, meaning, it wouldn't be traveling, unless it has infinite mass which means that it can't be slowed down even a bit but that contradicts the theory that it does have 0 mass)

2007-01-08 11:42:27 · 4 answers · asked by Anonymous

Can someone provide a simple and convincing reason why mass dosen''t always add when two system combine but momentum and energy always does?

Energies and momentum add because of conservation laws but mass is conserved as well isn't it?

Or is it the case that we are dealing with invariant mass hence is special? This sounds a bit mystical.

2007-01-08 11:36:32 · 2 answers · asked by Anonymous

I read somewhere that for something near a black hole time slows down. What could cause this? and why is it that time slows down near to huge gravity fields, and time speeds up for an object travelling close to the speed of light?

2007-01-08 11:31:27 · 12 answers · asked by Anonymous

See previous details for constraints

In many answers, I see you are you are assuming that the plane is not flying, or cannot fly. Cannot take off, Or that the box is too small etc. I will clarify some more.

How about this.... The weightless box is full of air, is the size of texas, has weather etc, and could be lifted by the airplane if the airplane were flying outside of the box...

2007-01-08 11:30:16 · 6 answers · asked by John R 2

I am making a visual mnemonic device and i need 8 things that use,transfer,and have radiant energy!
I have the sun a microwave xrays need 8 more!!!!! I need to draw them!!! HELP thankyou all!!!

2007-01-08 11:19:14 · 4 answers · asked by Aaron 1

A 5.00 g bullet is fired horizontally into a 2.00 kg wooden block resting on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.20. The bullet remains embedded in the block, which is observed to slide 0.40 m along the surface before stopping.

What is the initial speed of the bullet?

I don't know how the coefficient of kinetic energy comes to play here... can anyone help please? Thanks in advance.

2007-01-08 11:18:25 · 2 answers · asked by abc123 1

Please Refer to Previous Additional details,

Now keep in mind that a plane does not have to push air downward to produce an upward force, that is the nature of lift.

2007-01-08 11:07:17 · 4 answers · asked by John R 2

if you induce a charge in a material and thus make it lose electrons or gain electrons, does it's mass change?

2007-01-08 10:59:37 · 3 answers · asked by Eragon <3 2

Two bimetallic strips have identical shapes one is made from aluminum and steel, while the other is made from copper and silver. Which is likely to bend more for a given chance in temperature? Justify your answer. Explain greatly as possible, thanks

2007-01-08 10:47:52 · 2 answers · asked by bhangraking777 1

Does electrical light (lightning etc) travel at the same speed as light from the sun? If not, what does it travel at?

2007-01-08 10:44:55 · 7 answers · asked by 1K 6

I need to turn the equation 1/2m1v0^2+1/2m2v0^2=1/2m1v1f^2+1/2m2v2f^2 into
v2f=[(2m1)/(m1+m2)]v0

I have been working on this problem for a while now and I feel like my head is going to explode. I can't figure it out and my teacher won't help me. Can you please show me how to do it step by step.

2007-01-08 10:43:08 · 2 answers · asked by bluevolleyball12 1