Physics - March 2007

If a certian amount of salt raises the salinity by a predetermined amount, wouldn't it be possible to determine the amount of water in a vessel by doing the math? If I know the amout of salt and the subsequent rise in salinity, I should be able to extrapolate the amount of water. Right? So, if I add 50 lbs of salt to a pool, and the salinity gos up by 500 parts per million, all I would need to know to determine the volume would be, how much does one lb of salt raise the salinity of one gallon of water. Any thoughts?

2007-03-18 10:01:12 · 2 answers · asked by waahooo 2

Do you think it is more likely that they must have been purposefully adjusted, or that they exist due to probabilities/statistics?

2007-03-18 10:00:10 · 5 answers · asked by Anonymous

If there were identical (not paternal) twins, Twin A and Twin B, on Earth; and Twin A was to depart to a very, very, very distant star and comeback (in a spacecraft of course) in a speed of light (hypothetically duh) who would look older and from which perspective?

1.) From Twin A's perspective: Twin B would look older

2.) From Twin A's perspective: Twin B would look younger

3.) From Twin B's perspective: Twin A would look older

4.) From Twin B's perspective: Twin A would look younger

5.) Neither, from any perspective, would look older or younger.

***HINT: more than one answer MAY apply***

=)

Have fun boggling your minds! =)

2007-03-18 09:57:22 · 7 answers · asked by Anonymous

1. Below is a circuit with resistors in parallel. The battery supplies 10 volts. Find the current in each resistor.
R1 = 1 R2 = 2 R3 = 3 R4 = 4 R5 = 5 R6 = 6 R7 = 7 R8 = 8

┌ R1 ┐
├ R2 ┤
├ R3 ┤
├ R4 ┤
├ R5 ┤
├ R6 ┤
├ R7 ┤
├ R8 ┤
└10V┘

2. Below is a circuit.
R1 = 1 R2 = 3 R3 = 5 R4 = 1 R5 = 7 R6 = 2 R7 = 4

Find the voltage drop across every resistor.


┌ R5── R6 ─┐
│　　┌ R3 ┐ │
├ R2 ┤　　├┴┐
│　　└ R4 ┘　│
│　　　　　 　│
└ R1─10V─R7 ┘

2007-03-18 09:55:10 · 4 answers · asked by Anonymous

2007-03-18 09:46:41 · 3 answers · asked by medea 1

A sports car traveling along a straight line increases its speed from 19.7 mi/h to 59.7 mi/h. What is the ratio of the final to the initial magnitude of its momentum?

What is the ratio of the final to the initial kinetic energy?

2007-03-18 09:43:42 · 2 answers · asked by Anonymous

In many cases the average-velocity-versus-time graph does not pass trough zero. What are some reasons?

2007-03-18 09:40:08 · 1 answers · asked by House music rules 1

If you bounce on a trampleen say a dozen times then climb off and try to jump both feet off the ground at the same time you`ll find you can`t jump why ?

2007-03-18 09:38:35 · 6 answers · asked by oobedoo 1

I was just wondering,
A) What is the actual definition of a dimension,
B) How many dimensions are there,
and C) What are the dimensions?

2007-03-18 09:26:17 · 2 answers · asked by The Ponderer 3

HA HA HA sort that out you clever dic ks

2007-03-18 09:08:06 · 26 answers · asked by Anonymous

an all electric household used 3820 kilowatt hours of energy a month. it cost 230 dollars. what average rate (cost per kilowatt hour was charged)?

2007-03-18 08:46:12 · 5 answers · asked by socom_lover 2

In a needle biopsy, a narrow strip or cylinder of tissue is
extracted from a patient with a hollow needle. Rather than
pushed by hand, to ensure a clean cut the needle can be “fired”
into the tissue with a spring or a burst of air. Suppose that the
tip of the needle moves through 2.40 cm of skin and soft tissue,
which exerts a a resistive force of 7.60 N. If the mass of the
needle is 5.6 g, what must be the velocity of the needle as it
first enters the patients body?

The procedure is most important!

2007-03-18 08:02:40 · 1 answers · asked by Anonymous

a) is a packet of energy
b) can only be absorbed by electrons if they have enough energy to boost electrons to a higher orbit
c) contains an amount of energy that depends on their frequency
d) is the fundamental unit of electromagnetic energy
e) all of the above

2007-03-18 07:59:17 · 13 answers · asked by marvelmaverick 1

a) the enormous energy release
b) the kinetic energy of the decay products
c) ejected neutrons
d) the conversion of mass to energy
e) none of these

2007-03-18 07:53:48 · 2 answers · asked by marvelmaverick 1

and dont say are eyes or through are eyes

2007-03-18 07:41:06 · 8 answers · asked by hollyberry 2

use kinetic theory to explain this effect

2007-03-18 07:34:04 · 1 answers · asked by Anonymous

I found a gud science project to do.It's on the Doppler Effect.Can anyone give me a few experiments 2 show it?

2007-03-18 07:33:24 · 3 answers · asked by lil_ler12 3

If you were to somehow get to the edge of the universe what would happen if u traveled beyond it?

2007-03-18 07:25:48 · 17 answers · asked by Anonymous

2007-03-18 07:22:49 · 10 answers · asked by mina t 1

2007-03-18 07:22:44 · 14 answers · asked by hollyberry 2

2007-03-18 07:22:04 · 2 answers · asked by RAM KRISHNA MISHRA 1

2007-03-18 07:20:51 · 11 answers · asked by hollyberry 2

A pendulum is released to swing freely. On the first swing, the pendulum travels a distance of 18 inches. On each successive swing, the pendulum travels 90%of the distance of the previous swing. What is the total distance the pendulum swings? After how many swings has the pendulum traveled 80% of its total distance?

2007-03-18 07:20:20 · 2 answers · asked by Anonymous

Can you help me with these 2 problems. thnx.

1. A 1 kg mass weighs 9.8 N on earth's surface, and the radius of the earth is roughly 6.4 x 10^6 m. Calculate the mass of the earth.

2. Calculate the mass of the sun using Newton's version of Kepler's 3rd Law.

2007-03-18 07:08:28 · 3 answers · asked by Anonymous

i need to know tell me plz

2007-03-18 07:07:05 · 15 answers · asked by hollyberry 2

I have no idea how this relates to physics, but it's in my science textbook. I need help:
Suppose you are an astronaut making a space walk outside your space station when your jet pack runs out of fuel. How can you use your empty jet pack to get you back to the station?
Please explain

2007-03-18 06:59:20 · 2 answers · asked by litz 3

F=Gmm/r^2
Newton's law of gravitation.
My book says "if you double the distance between two objects, the attraction between them becomes four times weaker."
I'm trying to understand how formulas are created from natural observation. So, why is it weaker by 4 times? I understand it's weaker because it's in the denominator but what if the distance is 3? Then 3^2=9, which is tripled. I have a math and physics book with two problems like this that explain it as an even decrease. Why is this? Because it is squared? But only 2^2 and 4^2 produce answers that are multiplied by four-all others do not-what am I missing? Thanks!

2007-03-18 06:36:10 · 2 answers · asked by Anonymous

What is it?

2007-03-18 06:30:35 · 16 answers · asked by Anonymous

Here is what I need in the end:

83.5 kilohertz or any odd multiple of 83.5 kilohertz, aka 167 kilohertz, etc. It needs to switch between + and -, not on and off, etc.
3000v

I have thought of several ideas. One would be having a signal generator that sets the frequency, then stepping that up. My concern is, though, that most types of transformers will change the frequency. Does anyone have any ideas on this?

Another was to produce the voltage, then run it through a computer controlled switch like a spdt switch that would change the polarity in time with the frequency. Could a basic2 stamp be programed to do this?


thanks!

2007-03-18 06:11:26 · 1 answers · asked by metaphysics1221 2

I'm doing a project about Hybrid cars, for my final dusting off i decided to include this as a comparison, can't find the stastics anywhere. Does any one have a rough idea which is better?

2007-03-18 06:07:13 · 2 answers · asked by muhammaddarwish 2