Science & Mathematics - 17 July 2007

1. A roller coaster car rolls over the crest of a 30m high hill at a speed of 3.2m/s. The car then rolls down the track to the bottom of the hill and continues up the next hill, which is 20m high. Determine the speed of the car at the top of the second hill.

2. Maria wants to dive from the seaside cliff, but she does not feel safe hitting the water faster than 20m/s (44mi/h). What is the maximum height from which she dive?

2007-07-17 11:46:47 · 3 answers · asked by sunshinegirl93534 2 in Physics

A toy cannon uses a spring to project a 5.30-g soft rubber ball. The spring is originally compressed by 5.00 cm and has a force constant of 8.00 N/m. When the cannon is fired, the ball moves 15.0 cm through the horizontal barrel of the cannon, and there is a constant friction force of 0.032 N b/t the barrel and the ball. (a) With what speed does the projectile leave the barrel of the cannon? (b) At what point does the ball have max speed? (c) What is this max speed?

2007-07-17 11:45:33 · 2 answers · asked by Anonymous in Physics

Hoping you know from your own experience, maybe.

Would it be better to get them when a baby?

Maybe they would be better tempered if you got two as babies so they could keep each other company?

Maybe they are just plumb cranky, is that it?

Please tell me what *you* know about in which ways they are useful.

thank you
Lakshmi

2007-07-17 11:43:37 · 8 answers · asked by Anonymous in Zoology

2007-07-17 11:37:18 · 1 answers · asked by Anonymous in Chemistry

i need techniques on how to read faster

2007-07-17 11:33:24 · 3 answers · asked by Anonymous in Other - Science

I dont want to use any gas or co2 or anything that could explode.

2007-07-17 11:33:14 · 7 answers · asked by Michael P 1 in Other - Science

Nearly all of them are totally ripped. From what I can see its a genetic disposition to muscle growth and great bone structure..has there been any scientific studys on this?

As a weak white guy Im dead jealous..I wish I was like this!

2007-07-17 11:30:26 · 9 answers · asked by █ORal-K 2 in Biology

i've never even looked thru another persons telescope.
Total amateur

2007-07-17 11:29:21 · 7 answers · asked by Doug B 2 in Astronomy & Space

2007-07-17 11:26:58 · 5 answers · asked by t_on_e 3 in Physics

A child's rubber balloon of mass 2.5g is filled with helium gas of density .33kg/m^3. The balloon is spherical, with a radius of 12cm. A long cotton string with a mass of 2.0g per meter hangs loosely from the bottom of the balloon. Initially, the string lies loosely on the floor, but when the balloon ascends, it pulls the string upward and straightens it out. At what height will the balloon stop ascending, having reached equilibrium with the hanging portion of the string? Assume that the surrounding air has the density 1.29 kg/m^3

2007-07-17 11:23:27 · 1 answers · asked by yahoo answers 1 in Physics

2007-07-17 11:19:51 · 9 answers · asked by Anonymous in Astronomy & Space

I have been told they are not poisonous but can be aggressive and will bite. One has taken up residence outside my office door and I'm not happy at all. I have been told it is harmless but my research seems to say otherwise. I don't want it killed but rather just "rehomed". I'm in the Jacksonville, FL area and by looking at pictures it looks like a Northern Black racer as it is very dark and about 3' long.

2007-07-17 11:18:13 · 12 answers · asked by Anonymous in Zoology

200 million?

or 200 billion?

or are both wrong?

2007-07-17 11:18:07 · 16 answers · asked by Mutual Help 4 in Astronomy & Space

A tube is bent so that both ends are upward; the tube contains some water. Gasoline is poured into one end of the tube; the region with gasoline is 20cm high. How much higher is the gasoline-air surface than the water-air surface?

2007-07-17 11:18:05 · 6 answers · asked by yahoo answers 1 in Physics

The nests look long and their are a few connected to eachother. I remember breaking one open a year ago and found dead spiders in them. And the spiders didn't look like the same kind either. Why do they do this?

2007-07-17 11:17:09 · 4 answers · asked by Anonymous in Zoology

I suspect some of them are.

2007-07-17 11:16:35 · 7 answers · asked by Anonymous in Paranormal Phenomena

Triangle DEF has vertices D ( -4, 6) E (0,2) and F ( 8,6)
determine the coordinates of the ORTHOCENTRE of triangle ABC

2007-07-17 11:13:51 · 3 answers · asked by Anonymous in Mathematics

2007-07-17 11:12:30 · 3 answers · asked by Anonymous in Biology

2007-07-17 11:09:57 · 5 answers · asked by kobukmike 1 in Physics

how do you differentiate this problem????

g(x)= cos x^2 x + sin x^2 x+sin x

2007-07-17 11:09:39 · 3 answers · asked by Binky 3 in Mathematics

will it still work? my mom baught the wrong kind

2007-07-17 11:08:28 · 5 answers · asked by Anonymous in Chemistry

2007-07-17 11:08:05 · 3 answers · asked by Anonymous in Mathematics

2007-07-17 11:07:04 · 4 answers · asked by jan roe f 1 in Mathematics

A tri-cycle is at rest and the pedal is attached by a string. You pull the string with force F.
What does it do? and why? There is 4 reasons (concepts to the why question) so can anyone help me?

2007-07-17 11:05:16 · 5 answers · asked by rick m 1 in Physics

2007-07-17 11:04:08 · 7 answers · asked by CRAZYGIRL 4 in Weather

Is it the Milky Way galaxy?

2007-07-17 11:01:29 · 19 answers · asked by Mutual Help 4 in Astronomy & Space

2007-07-17 11:01:24 · 8 answers · asked by Schiller man 1 in Zoology

print reading for industry .

2007-07-17 11:00:30 · 2 answers · asked by Anonymous in Engineering

2007-07-17 10:59:11 · 5 answers · asked by CRAZYGIRL 4 in Physics

2007-07-17 10:58:46 · 3 answers · asked by wltz4vns 1 in Mathematics