Physics - October 2007

ok. i'm doing a physics experiment. in this exp. i have two tuning forks and a string. on this string there is a piece of paper. i have to hit the tuning forks, with different lengths of the string and have to notice when the paper on the string vibrates more. any help? i cannot do it in reality because it's only an experimental design!
i ahve to get to know what is the relationship between the frequency and the length

2007-10-02 05:11:11 · 3 answers · asked by yawm_pride 1

In class we used calorimeters to determine the caloric density of one planters peanut, but the resulting number was much much lower than the planters label indicates. My teacher asked us why that is and of course i said because the serving size on the label is much larger than the one we used in the experiment. she said this was wrong. the only hint she gave is that every year in her class the experiments caloric density gets lower and lower. Does anyone know why?

2007-10-02 05:02:02 · 2 answers · asked by abasylph2007 1

are incandescent light bulbs more efficient than flurescent light bulbs?

2007-10-02 04:30:20 · 2 answers · asked by Anonymous

A particle leaves the origin with an initial velocity v = 3.00 i, in meters per second. It experiences a constant acceleration a = -2.00 i - 1.400 j, in meters per second squared.

(a) What is the velocity of the particle when it reaches its maximum x coordinate?
______m/s i + _______m/s j + __________m/s k

(b) What is the position vector of the particle at this time?
_______m i + _________m j + __________m k

2007-10-02 04:27:28 · 2 answers · asked by Anonymous

can somebody please explain how does it work?

2007-10-02 04:05:39 · 2 answers · asked by hotrodofasia 1

2007-10-02 02:51:38 · 2 answers · asked by Makmariamiss 1

Please elaborate well the solutions.

-extended thanks =)

2007-10-02 01:47:03 · 1 answers · asked by Anonymous

Hi!

I would like to know why when we freeze water, the volume of water is still the same as before when it has frozen to become ice?

Example :

When you fill a cup with water full to the brim and put it in a freezer, after it has frozen and you take it out, the ice is frozen to the brim too.

I thought that the particles in solids are closely packed together?? Why doesn't the water particles group together?? If the particles DO group together, shouldn't the ice be smaller when it is frozen?

2007-10-02 01:44:54 · 4 answers · asked by Yap Joey 1

why is an ice bag at zero degree Celsius more effective coolant than equal amount of water at zero degree Celsius?

2007-10-02 01:29:12 · 3 answers · asked by Anonymous

2007-10-02 01:17:27 · 2 answers · asked by Anonymous

2007-10-02 01:14:55 · 1 answers · asked by ZAS D 1

so lets say hypothetically there is a positron in my house, right in front of me (somehow it managed to avoid contact with all other electrons, idk but its there). and right infront of me it hits an electron and they annihilate eachother. would i die?

2007-10-02 00:51:12 · 2 answers · asked by Anonymous

and not 600 000 000 m/s for example.
I mean given that photons are massless why isn't the speed
of light infinite ?

2007-10-02 00:49:18 · 11 answers · asked by Anonymous

please help me... this is my project.. XD

2007-10-02 00:35:27 · 2 answers · asked by Marvin Shane 2

I'm sorry guys, but I just can't get this stupid question for an assignment I have due tommorow, can anyone help me ???

A block of mass m = 2.5 kg is dropped from height h = 74 cm onto a spring of spring constant k = 1400 N/m. Find the maximum distance the spring is compressed. If someone could tell me how to do this question... I would be forever greatful.

And THankyou to anyone who post!!! :)

-Sarah

2007-10-02 00:27:46 · 4 answers · asked by Sarah C 1

2007-10-02 00:08:24 · 5 answers · asked by Ariel 2

This feels like something I should know, but am just too stupid to remember. Can someone here help me out?

I am not looking for Newton's second law of f=ma. Instead what I want is if given one objects velocity and mass, what is the force that it applies to another object that it collides with (eg a rock with a known mass and final velocity impacts the ground, what is the force it hit's the Earth with?).

2007-10-01 23:40:35 · 6 answers · asked by Mat of the RSPSOA 7

I need to create a curtain of mist, whether it be water or carbon dioxide. if it is water, it should be superfine so as not to wetr the floor.

2007-10-01 23:39:41 · 3 answers · asked by THOR 1

After someone answers wouldn't it be so much easier if there was a respond to answer option?

2007-10-01 23:34:00 · 7 answers · asked by flugy98765 2

Most of you take the obvious answer yes BUT i only want people who know the right answer to give an answer because believe it or not glass doesnt have a definate shape and is considured to many the slowest moving liquid, if you have windows that are decades old feel both sides of the top with both ands and move your way down, it will get fatter as you go down meaning it flowed down over time. But ive heard that a liquid also has to flow at a certain pace in order to be a liquid. If you didnt know glass didnt have a permanent definate shape that could change with no interferance then you just learned somthing from a person asking you a question :)

2007-10-01 22:39:46 · 10 answers · asked by flugy98765 2

2007-10-01 21:03:21 · 5 answers · asked by bramix 2

Explain the physical reason.

2007-10-01 19:05:49 · 5 answers · asked by glamour girl 1

Help me..

2007-10-01 18:21:54 · 7 answers · asked by Anonymous

i have to do a lab to find the coefficient of friction. In this lab, we must slide a block down an inclined plane. we have to find the following forces. Fp = Force of parallel, Fn = Force of Normal, and Ff = Force of Friction. Also I have to find the coefficient of friction (μ). I have no idea how to find it but so far i have the angle of the slope (27°) and the Fw (force of weight) which is 1.1N. Youre suppose to use trignometry to find these values. Also Fp equals Ff in magnitude in this trial and you can calculate the coefficient of friction after obtaining all this other info. Ff is equal in magnitude and opposite in direction to Fp. I've provided an rough image of how everything looks like.

http://img.photobucket.com/albums/v146/xplicitbabs/physics.jpg

2007-10-01 18:10:07 · 1 answers · asked by Anonymous

1) There are two equations for power consumed by a device:

P = I²R
P = V²/R

The first expression indicates that Power is directly proportional to R whereas the second expression indicates inverse proportionality.
How can the seemingly different dependence of P on R in these expressions be explained?



2) An electrician puts a fuse of rating 5A in that part of domestic electrical circuit in which an electrical heater of rating 1.5kW, 220V is operating. What is likely to happen in this case and why? What change, if any, needs to be made?

2007-10-01 17:53:54 · 9 answers · asked by Akilesh - Internet Undertaker 7

Can someone explain the quantum theory to me?? Good answers plz

2007-10-01 17:42:05 · 4 answers · asked by Anonymous

2007-10-01 17:40:20 · 3 answers · asked by shayma h 1

At the starting gun, a runner accelerates at 1.9 for 4.8 . The runner's acceleration is zero for the rest of the race.

What is the speed of the runner at ?

What is the speed of the runner at the end of the race?

2007-10-01 17:31:46 · 3 answers · asked by razac24 1

2007-10-01 17:30:34 · 8 answers · asked by sweets 1

like does one or the other allow you to solve more basically?

2007-10-01 17:30:10 · 3 answers · asked by Anonymous