Questions and Responses on Physics

Here is the 1301.2 question web page.

Please ask your questions to improve your learning,

and answer others' questions by clicking appropriate button under each question. I will add my share as time goes. Check from time to time if your questions have been answered by me if not by other students.

Here are some questions you asked. If you know answers to any, or if you can add more insights to the existing answers, please add them here.

Go back to Question Start age.

Happy reading!

INDEX

test

test question

WAVES BREAKING

science

Automobile mechanic

Plant Growth in Space

please can u help me

Resistance of wire

hair

Physics for a beginner.

the moon

Science

Pendulum

student

phisic problem

Astro

please can you help me to understand the question?

Circus physics

Does the period of motion of a pendulum depend on its weight, amplitude, or length?

45°

internal combustion

artist, astrocosmic quest

PLEASE!!

physics

Master

Sound within hollow containers

internal combustion engine

does the period of motion of a pendulum depend on its weight ,amplitude,or length

waves

Long Jumpers

Phyisics and fast balls

how to use optics...

1... example from last quarter

Question 43: test
test1
Add Answer...(from yuici) <yk@umn.edu>
- Wednesday, March 20, 2002 at 13:32:06 (CST)

Question 42: test
test1
Add Answer...(from yuici) <yk@umn.edu>
- Wednesday, March 20, 2002 at 13:22:07 (CST)

Question 41: test question
test question
Add Answer...(from yuichi) <yk@umn.edu>
- Wednesday, March 20, 2002 at 00:09:47 (CST)

Question 40: WAVES BREAKING
why do waves break? and how do they break? could you please include a diagram?
Add Answer...(from ) <ghazalghodosi@tc.umn.edu>
- Saturday, March 09, 2002 at 01:19:33 (CST)

Question 39: science
Dose the Period of Motion of a Pendulum Depend on its weight, amplitude, or length?
Add Answer...(from Brian oliveira) <bmno12@hotmail.com>
- Wednesday, February 06, 2002 at 15:40:44 (CST)

Question 38: Automobile mechanic
There is a way to calculate the weight of a vehicle somehow by measuring the footprint of each tire by using stiff paper placed around the tire and taking measurements. I also believe the tire pressure has something to do with it. I read this calculation, believe it or not, in Beakman and Jax comic strip. Any help you are able to give me will be greatly appreciated.
Add Answer...(from Tom) <Meanstr8@cs.com>
- Sunday, January 13, 2002 at 21:59:15 (CST)

Question 37: Plant Growth in Space
This has been on my mind for quite some time. How do carrots grow in space? Do they grow differently with out gravity? You could also respond at my e-mail stumde@vb.ispec.com
Add Answer...(from Donald Stump) <Stumde@vb.ispec.com>
- Tuesday, January 08, 2002 at 13:17:38 (CST)

Question 36: please can u help me
i want to find the integral of the function ( x cosx ) can u please tell me the method of solving this integral?
Add Answer...(from a) <sen_kal@hotmail.com>
- Tuesday, January 01, 2002 at 09:37:16 (CST)

Question 35: Resistance of wire
Why does the length of a wire (Constantan) affect its resistance?
Add Answer...(from ) <snowboardinged@hotmail.com>
- Sunday, December 02, 2001 at 08:25:55 (CST)

Question 34: Resistance of wire
Why does the length of a wire (Constantan) affect its resistance?
Add Answer...(from ) <snowboardinged@hotmail.com>
- Sunday, December 02, 2001 at 08:25:39 (CST)

Question 33: hair
Could you please tell me the physics behind hair development? Please explain what physics has to do with the growth, pigmentation, and damage of hair.
Add Answer...(from Michelle Mercurio) <motormouthmichelle@yahoo.com>
- Thursday, November 29, 2001 at 20:10:16 (CST)

Question 32: Physics for a beginner.
I wish to expand my knowlege in physics. Which books do you recamend for a beginner age 12? Physics is such an interesting topic.
Add Answer...(from Emma) <Ggangel77@hotmail.com>
- Sunday, November 18, 2001 at 21:43:46 (CST)

Question 31: the moon
is the moon travelling in a straight line because the earths
gravity has disstorted space like light travelling through space
Add Answer...(from graeme) <helen@feerguson10071.freeserve.co.uk>
- Friday, November 02, 2001 at 13:42:07 (CST)

Question 30: Science
Does the period of motion of a pendulunm depend on it's weight, length, or amplitude
Add Answer...(from brad) <th1278@aol.com>
- Wednesday, October 31, 2001 at 16:19:48 (CST)

Question 29: Pendulum
Does the weight of the pendulum affect the rate it moves?
Add Answer...(from ) <Flipstur23@aol.com>
- Thursday, October 25, 2001 at 18:32:15 (CDT)

Question 28: Pendulum
Does the weight of the pendulum affect the rate it moves?
Add Answer...(from ) <Flipstur23@aol.com>
Answer:
No, the period is dependent upon the pendulum length.
from JS(JediJainaSolo@hotmail.com)
- Thursday, October 25, 2001 at 18:31:59 (CDT)

Question 27: student
If everything in the universe supposedly started with the "Big Bang", what went "Bang" to cause this in the first place?
Add Answer...(from Chopper) <chevrock79@yahoo.com>
- Wednesday, October 17, 2001 at 19:08:29 (CDT)

Question 26: ,
l
Add Answer...(from m) < l@tc.umn.edu>
- Friday, October 12, 2001 at 09:51:38 (CDT)

Question 25: d
d
Add Answer...(from d) <d@tc.umn.edu>
- Thursday, October 11, 2001 at 11:29:41 (CDT)

Question 24: aa
333

Add Answer...(from ww) <ss@tc.umn.edu>
- Thursday, October 11, 2001 at 08:33:12 (CDT)

Question 23: phisic problem
A parachiutist bails out and freely falls 50m.Then the parachiutist opens , and thereafter she decelerates at 2 m/s2 she reaches the ground with a speed of 3 m/s (a) how long is the parachiutist in the air? (b) At what height dose the fall begin?
Add Answer...(from joe) <a_kal@hotmail.com>
- Wednesday, October 10, 2001 at 13:31:50 (CDT)

Question 22: Astro
an astronot in a space schuttle needs to replace a part. The replacement part is packed and boxed in a styrofoam container. Aboard the ship there is also an identical empty container. How can the astronat determine which box contains the part without opening both.
Add Answer...(from George Murdick) <gmurdick@prodigy.net>
Answer:
Shake it. The mass of the full box will make it harder to start and stop.
from Bill Stuwe(bstuwe@hotmail.com)
Answer:
read the label
from graeme(helen@ferguson10071.freeserve.co.uk)
- Tuesday, September 18, 2001 at 21:54:14 (CDT)

Question 21: please can you help me to understand the question?
how does the resistance of a wire depend on it's length?
Add Answer...(from Amy) <panic1014@hotmail.com>
- Monday, February 26, 2001 at 08:17:30 (CST)

Question 20: Circus physics
How can I relate Science to a circus
Add Answer...(from ) <Timthesecond@crosswalkmail.com>
- Saturday, January 06, 2001 at 13:26:37 (CST)

Question 19: Circus physics
How can I relate Science to a circus
Add Answer...(from ) <none@your.beezwax>
Answer:
It's all relative.
from Chopper(hotshot@bobrodney.com)
- Saturday, January 06, 2001 at 13:25:42 (CST)

Question 18: Does the period of motion of a pendulum depend on its weight, amplitude, or length?
I am doing a science project on this question and I have had trouble finding any information on this question directly. I don't know if this is what you mean by ask questions but I was wondering if you had any suggestions on where I could find information on this subject directly. The question for the science fair project is "Does the period of motion of a pendulum depend on its weight, amplitude, or length?" Thank you very much for your help
Add Answer...(from ) <Courts336@hotmail.com>
Answer:
No! a pendulum continues to swing. While the amplitude is consistant, if the length is accurate and the width is accurate. The amplitude must be consistant therfore alowing the pedulum to swing. Encouter resistance the pendulum will cease to swing. So therfore it depends on the the accuracy in/of the length and width of the pendulum,then it depends on the amplitude of energy to sustain the the point of motion.
from Curtis(xionchild77@hotmail.com)
- Friday, December 01, 2000 at 15:48:09 (CST)

Question 17: 45°
How do you demonstrate mathematicallythat a projectile launched at a 45° angle go farther away than a projectile launched at any other angle?
Add Answer...(from ) <catoplus@excite.com>
Answer:
the 45 is in the middle of the 90-0 degree scale. It affords the maxium in range because its run is equal to its rise.
from marxist(marxististheking@tc.umn.edu)
Answer:
Use Calculus to take the derivate of the function. Find the min/max that way...
from Allan(evansad@hotmail.com)
- Wednesday, November 22, 2000 at 00:37:50 (CST)

Question 16: internal combustion
what is the wave action in inlet and exhaust manifolds of internal combustion engines
Add Answer...(from ) <mastergenius@mad.scientist.com>
- Wednesday, June 28, 2000 at 11:01:00 (CDT)

Question 15: internal combustion
what is the wave ation in inlet and exhaust manifolds of internal combustion engines
Add Answer...(from ) <mastergenius@mad.scientist.com>
- Wednesday, June 28, 2000 at 11:00:47 (CDT)

Question 14: artist, astrocosmic quest
why hasn't the use of an electric drive space vehicle that uses the quantaum effect of moments of eneria, that is tuning a weight on a controlled variable radius to give a liner movement on that plane????
Add Answer...(from charlea a. rienks) <CRienks@aol.com>
- Friday, June 02, 2000 at 08:14:32 (CDT)

Question 13: artist, astrocosmic quest
why haven't the use of an electric drive space vehicle that in uses the quantaum effect of moments of eneria. that is tuning a weight on a controlled variable radius to give a liner movement on that plane????
Add Answer...(from charlea a. rienks) <CRienks@aol.com>
- Friday, June 02, 2000 at 08:12:05 (CDT)

Question 12: PLEASE!!
SIR,
I AM A STUDENT OF CLSS 8TH.I HAVE GOT A PROJECT TO MAKE i.e. A WORKING MODEL ON ANY FIELD OF PHYSICS.PLEASE SUGGEST ME A GOOD MODEL AND HOW IT IS MADE LATEST BY FRIDAY AS I HAVE TO LEAVE.IF YOU CANNOT SEND IT PLEASE MAIL IT THAT YOU ARE NOT SENDING IT SO THAT I DONT KEEP WAITING FOR IT.
THANKING YOU
MEDHA
Add Answer...(from MEDHA) <medham@hotmail.com>
- Thursday, May 04, 2000 at 05:20:07 (CDT)

Question 11: physics
1)The leaning Tower of Pisa is 55m tall and about 7.0m in diameter. The top is 4.5m off-centre. Is the tower in stable equilibrium? If so,how much farther can it lean before it becomes unstable? Assume that the tower is of uniform composition.
2)Ab animal tendon 15cm long was found to stretch 3.1mm by a force of 12.4N. the tendon was approximately round with an average diameter of 8.5mm. calculate the elastic modulus of this tendon.
Add Answer...(from ) <sadafsjaan@hotmail.com>
- Sunday, December 19, 1999 at 06:11:00 (CST)

Question 10: physics
1)orthodontic: what should be the tension in the wire if the force exerted on the tooth is to be 0.50N? Assume that the angle between the two forces is 160.

t=2N<----tooth---->t=2N
2)calculate the forces F1 and f2 that the supports exert ona diving board when a 50kg person stands at its tip.the board's mass is 40kg and its cg is at its centre.the board is 4.0m long and the first 1m is occupied by the two support.
3)an empty 1500kg car has its cg at 3.10m from the front of the car. how far from the front of the car will the cg be if two poeple sit in the front seat, 2.60mfrom the front of the car, and three poeple sit in the back sea,3.85mfromthe front?Assume that each person has a mass of 65kg.
4)a person 150cm tall lies on a light (massless)board that supported by two scales, one under the feet and one beneeth the top of the head. the two scales read 32.0kg and 29.4kgrespectively. where is the centre of gravity of this person?

Add Answer...(from haron evaz) <sadafsjaan@hotmail.com>
- Sunday, December 19, 1999 at 05:56:50 (CST)

Question 9: Master
how does the resistance in a wire depend on the lenght and and its surface area.
Add Answer...(from CyanideXXX) <Kuganesan@Compuserve.com>
Answer:
The resistance in a wire depends on cross sectional area and it's length. The larger it is, the less resistance to flow of electrons and vice-versa, just like a water pipe.
from Chopper(none@bobrodney.com)
- Sunday, October 17, 1999 at 09:24:02 (CDT)

Question 8: Sound within hollow containers
Where does the sound come from in a hollow sea shell or
other hollow container? There is a "roar" when such
items are held to the ear. Is the container acting as a
resonator or is thermal motion of air being converted to
sound? Does this experiment not work anymore when done
in an insulated sound-free room?
Add Answer...(from ) <CANAS@prodigy.net>
Answer:
HJVFKUSf
from anonymous(ZITSI@HOTMAIL.COM)
- Saturday, October 16, 1999 at 09:51:36 (CDT)

Question 7: internal combustion engine
what is amount of air pressure prodused,or required in each cylinder of a chevy 350 engine.
Add Answer...(from marc) <tsunbeam@aol.com>
Answer:
That's dependent upon your compression ratio (volume of cylinder on top dead center versus volume at bottom dead center). For a stock 350, it's usually around 150psi.
from Chopper(none@bobrodney.com)
- Friday, October 15, 1999 at 02:17:40 (CDT)

Question 6: does the period of motion of a pendulum depend on its weight ,amplitude,or length
does the period of motion of a pendulum depend on its weight ,amplitude,or length
Add Answer...(from ) <brenton_26@hotmail.com>
Answer:
YES!!!
from anonymous(BOB@aol.com)
- Wednesday, October 13, 1999 at 14:59:08 (CDT)

Question 5: waves
How do ocean waves create and break?
Add Answer...(from ) <buddytaste@aol.com>
- Tuesday, October 12, 1999 at 19:27:25 (CDT)

Question 4: Long Jumpers
The maximum range of a projectile is realized when it is launched at 45°. Thus, long jumpers leave the ground at 45°. Is this true or false?
Add Answer...(from E.T. Phone Home) <Eyesolation@hotmail.com>
- Tuesday, October 12, 1999 at 00:59:45 (CDT)

Question 3: Phyisics and fast balls
How does phyisics relate to
throwing a fast ball in baseball?
Add Answer...(from ) <ramaninarin@hotmail.com>
Answer:
is related to mechanics... 1.the gravity on earth
from yijia(yijia1998@yahoo.com)
- Tuesday, October 05, 1999 at 16:14:13 (CDT)

Question 2: how to use optics...
i saw a movie with meg ryan, and the kid from ferris buellers day off (can't remember his name...). anyway, he set up a variety of optical lenses to re-project the image from outside his window, onto a flat white wall inside his home... does anyone know how to do this, and with what kind of lenses? i am sadly unfamiliar with focal lengths, and refraction etc. but would very much like to do this to project the images inside my home. thanks in advance. robbie.
Add Answer...(from robbie) <ilktogolo@hotmail.com>
Answer:
Take Physics 2303!
from Yuichi(kubota@mnhep.hep.umn.edu)
- Friday, October 01, 1999 at 23:36:42 (CDT)

Question 1: g's (example from last quarter
I was reviewing for the physics test and I was I came across a question dealing with top gun pilots and the planes acceleration in g's. The book said that the pilot could not cgo much faster that 4 or 5 g's other wise the pilot would go unconcious. I was watching Armageddon over the weekend and when they "slingshotted" around the moon they were going something like 12 g's is this possible or was the movie just badly researched?
Add Answer...(from xxx yyyy) <xxxx0000@tc.umn.edu>
Answer:
Hi. I am not sure of the 4-5g part but as far as the movie goes, I guess it was a space craft which would nullify the g forces and keep it at an acceptable level
from Srikar(srikar.surendra@wipro.com)
- Tuesday, December 08, 1998 at 22:57:50 (CST)