Physics - September 2007

cuz i have NOOO idea

THANK YOU VERY MUCH in advance ; )

2007-09-20 11:41:19 · 2 answers · asked by Kathleen 2

Here's the question:

A man runs as fast as he can along a moving sidewalk from one end to the other, taking 2.50 s. A security agent appears, and the man runs as fast as he can back along the sidewalk to his starting point, taking 10.00 s. What is the ratio of the man's running speed to the sidewalk's speed.

I'd like have more than just the answer, I need to know how to work the problem.

Thanks for any assistance I get! It's much appreciated.

2007-09-20 11:31:43 · 1 answers · asked by Anonymous

2007-09-20 11:27:52 · 1 answers · asked by Anonymous

i need help :/

1.0 cm^3 of water has a mass of 1.0x10^.3 kg at 25degrees C. what's the mass of 1.0 m^3 of water at 25degrees C?

thanks so much ~

2007-09-20 11:22:32 · 1 answers · asked by Anonymous

And don't just say we'd float up in the air, obviously that would happen in the end...

2007-09-20 11:12:35 · 17 answers · asked by Bonobo 2

I don't get it at all :( I am taking Foundations of Science three and the question is:

What is the acceleration of a car that, while moving in a straight line, increases its spped from zero to 100 km/hr in 10s?

What? Can someone please explain why it has to have two units of time in a really simple basic way?

2007-09-20 11:06:07 · 5 answers · asked by Anonymous

its a physics question

2007-09-20 11:05:03 · 1 answers · asked by kitty d 1

An unstretched spring is 18.0 cm long. When you hang an 665 g weight from it, it stretches to a length of 21.0cm .

2007-09-20 10:50:44 · 2 answers · asked by Anonymous

And also whose work led to model that atoms contain electrons and protons?

2007-09-20 10:50:42 · 1 answers · asked by Updated Life th13f 2

A child runs down a 11 degree hill and then suddenly jumps upward at a 15 degree angle above horizontal and lands 1.3 meters down the hill.

2007-09-20 10:46:26 · 1 answers · asked by Michael E 1

If you coudl show your work it'd be greatly appreciated!! =)

2007-09-20 10:41:15 · 2 answers · asked by xplozno8 2

Suppose you held a proton, a neutron, and an electron in you hand. How can you tell them apart?

2007-09-20 10:38:56 · 3 answers · asked by vennysweetgirl21 3

Suppose an astronaut drops a feather from 1.2 m above the surface of the Moon. If the acceleration due to gravity on the Moon is 1.62 m/s^2 downward, how long does it take the feather to hit the Moon's surface?

Please show work!

2007-09-20 10:36:30 · 3 answers · asked by cahill_hooker 2

If he landed 56.6 m away at the same hiehgt at which he was fired, how long was he in the air?

If you could show all your work it'd be greatly appreciated!! =)

2007-09-20 10:36:02 · 2 answers · asked by xplozno8 2

Geez.. i don't get this science **** hahah

2007-09-20 10:34:11 · 5 answers · asked by Anonymous

A cyclist maintains a constant velocity of
6:7 m=s headed away from point A. At some
initial time, the cyclist is 253 m from point A.

What will be his displacement from his
starting position after 81 s? Answer in units
of m

What will be his position from point A after
that time? Answer in units of m.

2007-09-20 10:30:53 · 3 answers · asked by Jarod S 2

Please, I need this before tomorrow morning! Thanks.

2007-09-20 10:30:38 · 1 answers · asked by sean77771 1

These are the types that i need explained to me:

Nuclear
Chemical
Gravitational Potential
Elastic Potential

Can somebody please explain each of these to me using simplistic terms.

Thanks.

2007-09-20 10:04:04 · 2 answers · asked by Ahpro 2

A skydiver jumps from a plane 1000 meters above the ground. He waits for 8 seconds and then opens his parachute. How far above the ground is the sky diver when he opens his parachute? I really need the answer tonight! Please help if you can! Thanks.

2007-09-20 10:02:33 · 3 answers · asked by ☺♠JonasJay♫♦ 5

What is the average acceleration of a plane going 140mi/h in 2.10s ?

2007-09-20 09:52:48 · 1 answers · asked by chinwe 1

2007-09-20 09:47:15 · 2 answers · asked by New Mommy 1

Can anyone help - I am ok when calculating something dropped, but I don't know what I need to find out in the following;

A particle is thrown into the air at a speed of 15m/s from a height of Hm and reaches the ground in 4secs. Find the greatest height it reaches and the value of H.

2007-09-20 09:42:24 · 2 answers · asked by Anonymous

2007-09-20 09:30:48 · 1 answers · asked by Fatima I 1

find the disrance from A of the centre of mass of the given set of particles.

. 2a . 3a . a . < lengths
A_________o____________o______B
. 4m . m < mass

the answer to where the centre of mass is at is 13/5a

i cant work out where this came from i have a sigma formula to work with and got to x bar = 2a4m + 5am but who knows.

Help please and method please would be delightful thank you muchly.

2007-09-20 09:28:23 · 2 answers · asked by Jezza 2

A car is moving down a street at 55km/hr. A child suddenly runs into the street. If it takes the driver 0.75s to react and apply the brakes, how many meters will the car have moved before it begins to slow down?

2007-09-20 09:26:33 · 1 answers · asked by Ade 1

2007-09-20 08:53:10 · 25 answers · asked by Conspicuously Inconspicuous 2

Light is fascinating with it particle/wave character, possibly no mass and speed. But if applying energy can speed matter up and can change light's frequency, why can light not be made to go faster?

2007-09-20 07:54:15 · 13 answers · asked by BAL 5

the asteroid icarus, though only a few hundred meters across, orbits the sun like the planets..its period is 410d.. what is its mean distance from the sun??

2007-09-20 07:20:29 · 3 answers · asked by nur asyikin s 1

Evaluate how fast can a bicycle ride that after pushing a stick into the front wheel, the bicyclist won't flip over his head? Wheels and a stick are strong and unbreakable.
(I need to create a physical model with variables, equations and so on).

Thanks in advance.

2007-09-20 07:13:24 · 2 answers · asked by Pythagor 1

2007-09-20 06:58:14 · 10 answers · asked by goldenwingsxx 2