Physics - November 2006

Plain English Answers please.
I have my own definition, but want to see other peoples ideas.
Clocks are only mans way of measuring time, if clocks didn't exist time would.

2006-11-09 08:32:10 · 19 answers · asked by Sprinkle 5

...it falls back down but it doesn't fall back towards me at a great speed. Does that mean the car has its own gravitational force or something?

2006-11-09 08:20:15 · 7 answers · asked by AL IS ON VACATION AND HAS NO PIC 5

PROBLEMS FOR THE IYPT 2007
Important: the problems were intended for the IYPT and may be subject of copyright
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1. Filament
There is a significant current surge when a filament lamp is first switched on. Propose a theoretical model
and investigate it experimentally.
2. Slinky
Suspend a Slinky vertically and let it fall freely. Investigate the characteristics of the Slinky's free-fall motion.
3. Water jets.
What can be observed when two water jets collide at different angles?
4. Spring thread
Pull a thread through the button holes
as shown in the picture. The button can
be put into rotating motion by pulling the
thread. One can feel some elasticity of
the thread. Explain the elastic properties
of such a system.
5. Razor Blade
A razor blade is placed gently on a water surface. A charged body brought near the razor makes it move
away. Describe the motion of the razor if a

2006-11-09 07:35:03 · 3 answers · asked by Anonymous

It takes a planet 2.46 years to orbit the sun, which has a mass of 2 x 10^30 kg, in an almost circular trajectory.

Calculate the radius of the orbit of the planet as it circles the sun in units of m. Gravitational constant is 6.672 x 10^-11 N m^2/kg^2.

Also, calculate the oribital speed of the planet as it circles the sun in units of m/s.

2006-11-09 07:27:26 · 1 answers · asked by Dee 4

My brother has that as a homework question, I feel so stupid telling him i can't answer his questions because i don't remember anything about science.

The possible answers are - solid, liquid and gas.
they also have dry ice as an answer but i don't think it's that one.
can anyone help? thanks so much ~

2006-11-09 07:11:31 · 5 answers · asked by Calamity 2

a 0.44 kg pendulum bob passes through the lowest part of its path at a speed of 3.10 m/s. the pendulum cable is 80 cm long.

a.) what is the tension in the cable at the lowest part? 9.6 N (alread figured this part out)
b.) when pendulum reaches highest point, what angle does the cable make with the vertical? 67 degrees (got this part too)

HERE'S WHAT I DON'T KNOW:

c.) what is the tension in the pendulum cable when the pendulum reaches its highest point?

2006-11-09 06:48:02 · 4 answers · asked by alimortensen 1

If it was possible to be at the precise centre of the earth, would you still be subject to a gravitational pull? Presumably you would not be weightless at that point? If there is a pull, what is it exerted by i.e. which part of the earth? So are you at that point being pulled outwards away from the centre of the earth? How do gravitons work?
Please ignore the problems of temperature and pressure at the core, I know in reality it's not survivable. Also I'm talking only about the earth's gravitational pull, not that of the sun or other bodies.

2006-11-09 06:47:36 · 13 answers · asked by Ashoka 2

A - larger than the object
B - smaller than the object
C - located in front of the lens

2006-11-09 06:32:16 · 2 answers · asked by Basia 1

Consider a point in the ocean about 10.9 km deep. The pressure at that point is huge, about 1.12 X10^8 N/m2.

QUESTION:
What is the change in volume of 1.00 m3 of water carried from the surface to this point in the ocean in m^3?

2006-11-09 06:15:23 · 3 answers · asked by activegirl 1

2006-11-09 05:11:57 · 8 answers · asked by CAMERON w 1

if black holes is like a giant funnel of empty space . that pulls all matter intowards it than where does that stuff go .. it has to go some where you cant just get ride of matter it can be broken down so far but it is still a particle of matter and has weight and dimension.so what if the black holes are what started the universe such as a bubbled effect blow a piece of gum into a bubble and its expands and blows up.. because when things spin fast the natrual shape it fors is a circle well put that circle into a 3 - deminsional shape or 4th than it would be a bubble instead of a flat circle at the exit point of the black hole.. and well this would expalin the big bag a huge bubbled black hole expands so far to cause a huge explsion starting the universe ..a nd wheres the stuff come from.. a diffrent pararell dimension/universe.. or the same universe just a diffrent section.. of a even greater one.

2006-11-09 05:09:27 · 7 answers · asked by dustin s 1

i need to get it to speed in less than 30seconds.
where would i find this type of motor? or what kind of motor would be recomended?

2006-11-09 05:05:52 · 1 answers · asked by psycho 3

2006-11-09 04:43:47 · 9 answers · asked by mariacapitummino 1

2006-11-09 04:17:09 · 4 answers · asked by kubitzzzz 1

Energy may be defined as:
A the ability to do work
B the product of power and time
C something which can be transferred from one object to another
D all of the above

How much energy is a 75 Watt light bulb transferring if it is on for 90 seconds?
A 1.2 Joules
B 15 Joules
C 165 Joules
D 6750 Joules

How much time is a 100-Watt light bulb turned "on" if it transfers a total of 7000 Joules of energy?
A 70 seconds
B 6900 seconds
C 7100 seconds
D 700,000 seconds

How much power has a lawnmower delivered if it imparts 6000 Joules of energy in 20 seconds?
A 300 Watts
B 5880 Watts
C 6020 Watts
D 120,000 Watts

2006-11-09 04:11:48 · 2 answers · asked by maconheira 4

and your in the plane can u hear the Sonic Boom

2006-11-09 03:59:41 · 5 answers · asked by keri.griffiths@btinternet.com 1

As seen from TV news, the scientists had to familiarize their movements in the outer space by being trained in the simulated flight. The question is HOW the flight had to be acrobatically operated in order to create the circumstance of no gravity for them.

2006-11-09 03:52:56 · 7 answers · asked by Udom J 1

is this another glass half full/empty? Is darkness as is light simply cannot see?

2006-11-09 03:46:33 · 17 answers · asked by Anonymous

2006-11-09 03:09:39 · 3 answers · asked by siavashs2001 2

For example, a fire hydrant shoots water at 200 liters a second, how to convert this to its velocity?

2006-11-09 02:58:56 · 3 answers · asked by Anonymous

^topic

2006-11-09 02:47:57 · 2 answers · asked by Andrew T 2

is there any known medium in which light travels at a velocity greater than 186,000 mi/sec? If not, is there, in theory, any reason why such a medium could not exist?

2006-11-09 02:42:41 · 10 answers · asked by Seeker 4

What are the uses and applications of microwaves, and do they effect our everyday lives?

2006-11-09 02:13:57 · 4 answers · asked by Anonymous

2006-11-09 01:56:31 · 5 answers · asked by Anonymous

Can someone explain this demonstration to me its the one where someone stands on a disc but it won't spin until the wheel does. Specifically I want to understand the conservation of angular momentum where the wheel flips over.
http://www.wfu.edu/physics/demolabs/demos/avimov/bychptr/chptr3_energy.htm
near the bottom.
Thanks for any help.

2006-11-09 01:50:41 · 2 answers · asked by Philip J 2

*It has to be very very very very current!!!

2006-11-09 01:25:40 · 3 answers · asked by Anonymous

A jet is flying at the speed of sound: A gun is fired from the rear of the plane: The bullet is traveling at the speed of sound: Will the bullet simply drop to earth?: If not, why not?

2006-11-09 00:41:32 · 6 answers · asked by gntolng 4

the q. says the speed camera gives out bright flashes to provide enough light for the photographs. how does the light from the flash get back to the camera to produce the photographs?

2006-11-09 00:35:03 · 4 answers · asked by keyguitargirl 2

If everything is made of elements, what is wood consist of? or a leaf? which element?

2006-11-09 00:14:27 · 7 answers · asked by Neo 1

automobile collision. Cars are designed with a “crumple zone” in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton’s first law!) until hitting the dashboard or windshield. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm.

A) A 60 kg person is in a head-on collision. The car’s speed at impact is 15 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.
B) Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or air bag.
C) How do these two forces compare to the person’s weight?

Please show your work. Thanks.

2006-11-09 00:13:22 · 2 answers · asked by ANON 1