Physics - January 2007

If the land to water ratio of the earth is 1:2;and if land to water ratio of the northern hemisphere is 2:3 then what is the ratio of land to water in southern hemisphere.

I know I copied this question from someone else, and i give the credit to pari k. I put an answer to the question,but then i pressed delete when i wanted to change it. Then this program didnt let me answer the question again. Anyways here is my answer: 1:2.75
What did u guys get?

2007-01-18 19:02:36 · 6 answers · asked by sum1 2

If the land to water ratio of the earth is 1:2;and if land to water ratio of the northern hemisphere is 2:3 then what is the ratio of land to water in southern hemisphere.

2007-01-18 18:38:06 · 13 answers · asked by deva 3

I am doing a car project and I need a little help in hydraulic. If you have one piston with 100mm sq piston area, is it the same as having 4 pistons each having 25mm sq piston area? In term of Force.

2007-01-18 18:27:01 · 3 answers · asked by u2thai562 2

I need to construct a device to launch a launching sphere ( a wooden ball about the size of a grapefruit or a small canteloupe) across a field. It has to go REALLYY FAR!!! here are some rules:
-must be completely mechanical: no chemicals or combustion
-must have wheels attached to the bottom
-must be free to roll once it has been fired
-cannot exceed 4ft in any dimension (h,l,w,)
-must remain upright during and after launch

2007-01-18 18:02:50 · 5 answers · asked by eliannemsr 2

olive oil.

So far I have variables: temperature, mass and energy
and procedure:
Put .1kg of milk and .1KG of olive oil into 2 glasses. To measure mass ill use electronic scale and subtract mass of the beaker to find mass of substance pored.
- Oil and milk will be at room tempereature (20 degree celsius) by using bunsen burner and messuring temperture through thermometer.
I also have equation
q=mc delta T. Where q is heat.
Please help me finish!

2007-01-18 17:41:10 · 1 answers · asked by guest987654321 2

According to the article here:http://www.astronomy.com/asy/default.aspx?c=a&id=4994 there are globs of dark matter floating around. If a space ship ran into them what would happen?

2007-01-18 17:07:13 · 3 answers · asked by Anonymous

2007-01-18 17:03:00 · 3 answers · asked by Rao M 1

2007-01-18 16:42:36 · 7 answers · asked by Somebody 1

Air bags are designed to deploy 30 cm in 12 ms. Estimate the acceleration of the front surface of the bag as it expands. Express your answer in terms of the acceleration of gravity g.

2007-01-18 16:41:51 · 4 answers · asked by eureka4sureka 1

2007-01-18 16:22:45 · 4 answers · asked by steaua 3

2007-01-18 16:15:25 · 7 answers · asked by bobby 3

The speed, v, of an object is given by the equation v = At5 - Bt6 where t refers to time. What are the dimensions of A? (Express your answers using only m for distance and s for time.)

What are the dimensions of B?

2007-01-18 15:54:16 · 1 answers · asked by nafiseh g 1

A "light-year" is the distance light (speed = 2.998 108 m/s) travels in one year.
(a) How many meters are there in 14.0 light-years?

2007-01-18 15:49:15 · 11 answers · asked by nafiseh g 1

It used to be common wisdom to build cars to be as rigid as possible to withstand collisions. Today, though, cars are designed to have “crumple zones” that collapse upon impact. What advantage does this have?

2007-01-18 15:25:23 · 7 answers · asked by ? 2

The car moved 2km towards east made a perpendicular left turn ran for 500mmade a perpendicular right turn ran for 4 km and stopped. find the displacement of car

2007-01-18 14:35:09 · 7 answers · asked by Anonymous

2007-01-18 14:29:51 · 1 answers · asked by amanda32 1

Besides the God thing...

2007-01-18 14:28:12 · 3 answers · asked by Anonymous

How do you find the mass of an object when you only have it's density and length? I know that density is mass/volume. But' I can't figure out a way to get the volume with only the length. Please help! The question is a piece of rope has a density of 6.1g/cm. What is the mass of 10.7 cm of the wire? Answer needs to be in grams.

2007-01-18 14:20:43 · 3 answers · asked by candy525 1

This is crazy, I am trying to learn whether Anode is the positive side of the battery or the negative Side. So far, I got 15 people telling me its positive and 15 telling me its negative. So, please could anyone here clear this up? Anode is positive or Negative, and what about Cathode?

2007-01-18 14:16:12 · 3 answers · asked by Blue Jay Z 4

p= momentum (Js/m)
h is Planck's constant =6.62*10^-34 (Js)
c is speed of light =3*10^8 m/s

2007-01-18 14:11:53 · 2 answers · asked by Ha P 2

The oscillation period of a pendulum varies as the square root of its length and inversely as the square root of the acceleration due to gravity. Given that the moon has 1/6 the earth's gravity, how much shorter should a pendulum on the moon be in order to have a period that is twice as long as a pendulums period on earth?

2007-01-18 13:57:44 · 2 answers · asked by Becca 1

2007-01-18 13:49:39 · 0 answers · asked by Anonymous

2007-01-18 13:48:17 · 1 answers · asked by Anonymous

I have lived in two different houses in the past 5 years, and in both houses, I consistently burn out light bulbs when I turn them on. At least 2 a week, up to 5 a week in various rooms. My husband and visitors to my houses have never had this problem. It seems to just be me. Has anyone ever had this problem? What do you think?

Someone once told me that some people have more energy than others - do you believe this?

2007-01-18 13:45:23 · 6 answers · asked by amy23 3

2007-01-18 13:29:38 · 6 answers · asked by Becca 1

the density of an unknown substance is 312 kilograms per cubic meter. (a) what is the mass of 2.43 cubic meter of the substance? (b) how much does this substance weigh?

2007-01-18 13:26:00 · 2 answers · asked by argentina_mandy20 1

moving a force of 512 newtons through a distance of 25.0 meters requires how many joules of energy? if johnathan did this 10 times, how many joules of energy did he expend? one food calorie = 4186 joules. how many food calories of energy did he use?

2007-01-18 13:19:35 · 1 answers · asked by argentina_mandy20 1

jim is practicing kangaroo handball, and he throws a 0.15 kg ball so that it hits a wall with a velocity of 18i + 3.2j m/s. since the wall is vertical, it changes only the ball's horizontal velocity. it exerts a force of -88.0i newtons on the ball for 0.060 secs. find the ball's intial and final momentum.

2007-01-18 13:16:55 · 1 answers · asked by argentina_mandy20 1

If you bring an object closer to a converging mirror or a convex lens, how does that affect the attitude of the image after you hit the principal focus? Does it stay upside down, or does it flip around?

2007-01-18 13:11:49 · 1 answers · asked by Anonymous

Its not like they are ever going to succeed. Everything that can be invented has been invented. All the other discoveries will be just minor improvements.

2007-01-18 13:03:17 · 10 answers · asked by racecars 1