Science & Mathematics - 17 December 2007

A 1.8 kg ball is attached to a ceiling by a string. The distance from the ceiling to the center of the ball is 1.14 m, and the height of the room is 3.00 m.

(a) What is the gravitational potential energy associated with the ball relative to the ceiling?
J
(b) What is the gravitational potential energy associated with the ball relative to the floor?
J
(c) What is the gravitational potential energy associated with the ball relative to a point at the same elevation as the ball?
J

2007-12-17 01:53:56 · 1 answers · asked by Anonymous in Physics

1.
True or False

A linear model can be used to predict a value of y based on the value of x.


2.
True or False?

Linear growth is at a steady rate that does not change over time while exponential growth tends to grow more rapidly over time.

2007-12-17 01:53:15 · 4 answers · asked by Nicole 4 in Mathematics

An antique car has a mass of 585 kg with its riders. It starts from rest and travels to its top speed of 18.4 m/s over a distance of 60.89 m. It drives at this speed for 31 s. It is then allowed to roll to a stop. This takes 10.7 s.

alright i found the acceleration which is 2.78 M/s^2 but i need to know How much force acts on the car at the end to make it stop and What is the coefficient of friction between the car and the pavement? but finding the coefficiant is vital for me to understand... please help.

for finding the force i have been using F=ma but it is not working. i used 585 * 2.78 which is the acceleration but the computer is telling me im wrong.

2007-12-17 01:51:46 · 5 answers · asked by molly 1 in Physics

I do vounteer work with a Border Collie Rescue group, based out of a working farm. Yesterday I went up into a dis-used loft of a barn to toss down some straw and look at the eletrical wiring, and I found a nest - A HUGE nest - on one of the rafters. Unfortunately, the lighting and angle were bad, so I couldn't get a good image of it.

The nest was a large untidy heap of straw and feathers, about a foot high, and about three feet around. The feathers were light grey, and appeared to be belly feathers - the fluffy, insulating kind, almost downy. The loft is large, open, and well protected from the elements and intruders - Not even the barn cats can get in unless someone deliberately lets them in. The only access is via a pair of ~ 1 foot-square openings at the gable peak, near the hay hoist. There are NO signs of any other kind of bird in the loft, not even barn swallows. I saw no castings.

Could this be a barn owl nest? I hope so, as does the farmer. Any help figuring this out?

2007-12-17 01:49:16 · 6 answers · asked by Laird C 5 in Zoology

If a 100 watt light bulb burns for 60 minutes, how many joules of energy are consumed?
Choose one answer. a. 360,000 joules
b. 6.000 joules
c. 360 joules
d. 600 joules
e. 60 joules

2007-12-17 01:49:15 · 3 answers · asked by Thorn within a rose bush 1 in Mathematics

obviously it takes thousands of years to happen, but does it? maybe it just takes thousands of genarations, in which case could they not get something with a very short life span like a fruit fly, control it enviroment and see what happens?

2007-12-17 01:46:01 · 17 answers · asked by Ste B 5 in Biology

2007-12-17 01:45:07 · 1 answers · asked by Anonymous in Zoology

A 78.0 kg diver steps off a diving board and drops straight down into the water. The net force when in the water is an upward 1020 N. If the diver comes to rest 4.2 m below the water's surface, what is the total distance between the diving board and the diver's stopping point underwater?

2007-12-17 01:44:07 · 1 answers · asked by Anonymous in Physics

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2007-12-17 01:43:27 · 4 answers · asked by Swen 1 in Earth Sciences & Geology

A spring has a force constant of 570.0 N/m.

(a) Determine the potential energy stored in the spring when the spring is stretched 4.12 cm from equilibrium.

(b) Determine the potential energy stored in the spring when the spring is stretched 2.82 cm from equilibrium.

(c) Determine the potential energy stored in the spring when the spring is unstretched.

2007-12-17 01:42:51 · 2 answers · asked by Anonymous in Physics

A ball of mass 522 g starts at rest and slides down a frictionless track, as shown below. It leaves the track horizontally, striking the ground a distance x = 0.71 m from the end of the track after falling a vertical distance h2 = 1.24 m from the end of the track.



(a) At what height above the ground does the ball start to move?

(b) What is the speed of the ball when it leaves the track?

(c) What is the speed of the ball when it hits the ground?

2007-12-17 01:41:32 · 1 answers · asked by Anonymous in Physics

2007-12-17 01:39:53 · 2 answers · asked by crys w 1 in Mathematics

Why hasn't the skin of the white people who live in Australia become any darker yet. I mean, some of their families have been there for a couple hundred years now and they still get sunburned worse than a white British person who goes to Spain on holiday. If this process was to happen, how long would it take?

2007-12-17 01:38:28 · 23 answers · asked by andrew p 2 in Biology

2007-12-17 01:31:34 · 8 answers · asked by rogue 5 in Geography

2007-12-17 01:31:06 · 41 answers · asked by G.xi 1 in Astronomy & Space

this question was posted on physical science tema

2007-12-17 01:28:27 · 1 answers · asked by dunita 1 in Earth Sciences & Geology

Humans love having knowledge of everything; wouldn't they have wanted to send people all over the moon to perhaps draw maps or find out as much as they can about it? Why have they not had any people walk on the moon since 1972?

2007-12-17 01:25:41 · 13 answers · asked by Erin 2 in Astronomy & Space

"8 Cakes and 3 Pies Cost 6.40"
"5 Cakess and 2 Pies cose £4.05"

WHich would be...

8x + 3y = 6.4
5x + 2y = 4.05

is this correct?

2007-12-17 01:25:29 · 22 answers · asked by Anonymous in Mathematics

2007-12-17 01:21:58 · 10 answers · asked by Asha 2 in Engineering

how far (reference to Earth) should mankind go to be on a "safe distance" from the devastating explosion? Should we be on another galaxy to be safe?

2007-12-17 01:21:40 · 9 answers · asked by kid 1 in Astronomy & Space

2007-12-17 01:12:20 · 19 answers · asked by impress 1 in Mathematics

I wonder if any one could confirm or not. In the parietal cell there appears to be more mitochondria then in the goblet cell. Does this indicate that the release of HCI and intrinsic factor require more energy?? also would the transport of intrinsic factor need to cross the membrane via the protein pump??
Thanks.

2007-12-17 01:09:12 · 16 answers · asked by Anonymous in Biology

2007-12-17 01:09:11 · 12 answers · asked by Dr. NG 7 in Paranormal Phenomena

How would I equate the ff inc. their products:

1) KHP(aq) + NaOH -->
2) CH3COOH(aq) + NaOH -->
3) H2CO3(aq) + NaOH -->

*all numbers above are subscripts

Thank you very much!!

2007-12-17 01:08:48 · 2 answers · asked by bluespark 2 in Chemistry

Distinguish between P type& N type semi conductors

2007-12-17 01:08:21 · 2 answers · asked by Anonymous in Physics

(1) Scalar quantity
(2) Tensor
(3) Vector
(4) None of above

2007-12-17 01:00:48 · 1 answers · asked by ajith k 1 in Physics

Can u tell me what is mean by symbols use in mathematics. like
(b>a (b>a Where > or < is underlined.

2007-12-17 00:57:18 · 8 answers · asked by Abdul Hameed 1 in Mathematics

2007-12-17 00:55:16 · 8 answers · asked by derick b 1 in Mathematics

2007-12-17 00:52:12 · 1 answers · asked by James 2 in Chemistry

2007-12-17 00:51:12 · 11 answers · asked by derick b 1 in Mathematics