Physics - March 2007

path at 5.00m/s?

2007-03-17 10:31:28 · 2 answers · asked by Hannah 1

2007-03-17 10:30:56 · 4 answers · asked by Anonymous

I'm not certain of the answer, but...:
There is a negatively charged object lying on the ground. A neutral metal ball rolls toward this object and stops (i.e. due to friction) some distance away from the ball and does not touch it (implies induction, separation of charge.) A second neutral metal ball then hits the first ball on the back of the ball, i.e. on the side away from the negatively charged object, and transfers its momentum onto the middle ball, and stops. The middle ball then rolls toward the negatively charged object and stops (due once again to friction).
What is the net charge (+ or -?) at the end of all of this for each of the two metal balls?

My reasoning is: b/c of separation of charges, there are electrons concentrated at the back end of the first ball. Then, by conduction, electrons flow into the second neutrally-charged ball. The second ball thus acquires a negative charge, and the first a positive charge. But it seems mroe complicated than that...

2007-03-17 10:25:36 · 6 answers · asked by Jay Z 1

A squirrel jumps from one branch to another on 3 meters away at the same height. If hhe jumps at an angle of 20 degrees what minimum speed must he have in order to make the jump?

A baseball is thrown vertically upward with a speed of 25 m/s from a height of 2 meters. How long does it take it to reach its heighest point? How long does it take the ball to hit the ground after it reaches its highest point?

2007-03-17 10:24:30 · 7 answers · asked by bandgeek20042007 1

Why is a good conductor of electricity also a good conductor of heat?

2007-03-17 10:14:48 · 4 answers · asked by hintzruby 1

By how much is the electrical force between a pair of ions reduced when their separation distance is doubled? Tripled?

2007-03-17 10:11:16 · 3 answers · asked by hintzruby 1

A friend and I were talking about relativistic time dialation, and the question was asked: If you're travelling to Alpha Centauri and it takes you 4.5 years to arrive, (as observed by the traveller) then a) how fast were you going, and b) how much time has elapsed on Earth?

2007-03-17 10:07:18 · 1 answers · asked by ZeroByte 5

2007-03-17 10:04:51 · 2 answers · asked by Anonymous

a net force of 3,00 N accelerates a car from rest tp 36.0 km/h in 5.0 s

what is the mass of the car?

what is the weight of the car?

2007-03-17 10:04:49 · 2 answers · asked by Ashlee 3

1) One volt is the potential difference between two points if 1 joule of energy is needed to move _________ coulomb of charge between the two points.

2) When a lamp is plugged into a 120-V socket, each coulomb of charge that flows in the circuit is raised to a potential energy of_______ joules.

thanks

2007-03-17 10:01:04 · 2 answers · asked by Anonymous

2007-03-17 09:56:41 · 5 answers · asked by Anonymous

a 1,000kg car accelerates uniformly to double its speed from 36.0km/h in 5.00 s.

a)what is the net force acted on the car?

2007-03-17 09:48:47 · 4 answers · asked by Ashlee 3

2007-03-17 09:14:27 · 4 answers · asked by spackler 6

Ok, so I am in grade 9 and I am going to take a grade 10 challenge science exam. I was just wondering if anyone can tell me the things that are done in physics and the basics of physics? Plz send me links to websites where they teach basic physics and such, not wikipedia. I asked the grade 10 teacher for grade 10 physics notes and she said that in grade 10, they do introduction to physics. Can anyone tell me about that and send me links teaching it plz? Thanks.

So far in science, we have learned about atoms (bohr diagrams models, elements, etc.), cell reproduction (sperm, eggs, reproductive parts, etc), and we are currently on electricity. I am pretty sure that these things contribute to physics. If that is already a part of physics, plz send me the basic stuff of physics (link or just write info), along with begginers stuff and intermediate stuff. Thanks.

2007-03-17 09:10:00 · 1 answers · asked by Anonymous

Finding a suitable good paying job probably requires good specialized field that is in demand.

2007-03-17 09:09:19 · 2 answers · asked by carspare 2

2007-03-17 09:06:39 · 4 answers · asked by Aramis'Treasure 2

If you have any websites that would be good sources of information, please list them! Anything at all will help, since this is a science fair project. Thanks!

2007-03-17 09:02:31 · 1 answers · asked by PrettyKitty 3

2007-03-17 08:53:28 · 1 answers · asked by WILL C 1

2007-03-17 08:50:01 · 4 answers · asked by STORMY K 3

I know it sounds stupid, but I really do need to know. And can you give me a source so I can check several places?

2007-03-17 08:30:35 · 3 answers · asked by metaphysics1221 2

Okay this is a real question, and i'm sure everyones heard this in their lifetime. Say you are riding an open elevator or platform lift, and everything is normal. All of a sudden it malfunctions and despite all safety devices, and interlocks begins plunging at rediculous speed taking you to your impending death. What if , say you waited until you got near the bottom and timed a jump perfectly and fell at most 5-10 feet. Now if my hypothesis is correct, you should still be alive and escape maybe with a few broken limbs. What do you think? Please, i am calling on all scientists, physicists, doctors ETC. This has been bothering me and needs answering.

2007-03-17 08:29:59 · 4 answers · asked by Jayjay 2

I need to create a current of electricity that switches polarity with a frequency of 83.5 Kilohertz, then step that up in voltage without losing that frequency. Any ideas on how this may be done?

2007-03-17 08:11:00 · 3 answers · asked by metaphysics1221 2

can the speed of light be slow down? is neon light at the same speed of white or solar light?

2007-03-17 08:01:13 · 8 answers · asked by el_putaz 1

I want to check and see if I understand all of this correctly, so I'll list what I am thinking happens and you can correct me if I'm wrong, Ok?
I am talking about a very basic inductor in a very basic DC circuit, I am only wanting to understand the operation of an inductor in a circuit.

1. When the cirucit is first energized the coil acts like a resistor, it drops the maximum amount of voltage ( the amount of the source) which declines rapidly as the field builds. The voltage it drops is opposite to the increase in polarity only, equal in value.So it is exhibiting decreasing resistance to current flow in this charging state.

2 As current is decreased, the coil releases its energy by dropping a voltage of the same polarity to attempt and maintain the current's prior state. It is acting as a source in this state, but increasing its resistance to the change as its field deteriorates.
3. Steady state of current....NOT Sure?

2007-03-17 07:25:41 · 5 answers · asked by Anonymous

Show that uncertainity principle does not holds in daily life(macroscopic world), however it is valid in microscopic world.

2007-03-17 07:25:38 · 7 answers · asked by duke_nukem 2

do i add all the ohms in the circuit

2007-03-17 07:21:27 · 11 answers · asked by Anonymous

2007-03-17 07:12:24 · 5 answers · asked by Gabriella R 1

2007-03-17 06:45:47 · 9 answers · asked by blahhh 1

If you were to draw the universe what would it look like? Or if thats impossible if you were to draw sections of the universe what would it look like?

Cheers

2007-03-17 06:44:42 · 13 answers · asked by Anonymous

I would love to go 100 years into the future and see whats new, and if the world has changed for the better. with the hope that it wasnt destoyed or i might not get back.But lets just pretend that we can come back safly from wherever.Where would you go.

2007-03-17 06:36:04 · 2 answers · asked by patsy 3