Physics - September 2007

2007-09-26 04:03:23 · 10 answers · asked by michaeljamescarr 1

could you please help me solve this?

An electric flat iron with a resistance of 60 ohms, an electric lamp with 50 ohms and a aradio with 1000 ohms are connected in parallel to a 220volt source. if all of the appliances are switched on, solve for

a. current through the flat iron
b. CURRENT THROUGH lamp
c. current through radio
d.total resistance
e. voltage across each resistor


please..i want to follow and know how to answer it so can you show me the solutions....please....

2007-09-26 04:01:34 · 3 answers · asked by Ninik 3

Can you do the ideal gas equation but with an individual gas constant instead of the universal gas constant. The gas is air.

n-14
t-2773k
R-?
v-3 litres
p-?

2007-09-26 03:54:46 · 4 answers · asked by Anonymous

Just the standers latex balloons, nothing fancy.

2007-09-26 03:54:06 · 3 answers · asked by shreksdonkeyy 2

I would like to see an equation for heat transfer in terms of velocity. If the velocity of the air flow doubles and everything else stays the same does the heat transfer double?

2007-09-26 03:48:51 · 2 answers · asked by dianpen7 1

2007-09-26 03:44:51 · 13 answers · asked by El Diablo King Of Kings 3

Hi to all!

Hope someone could help me on this.I just want to check if my answers are correct; or if its the same with yours.

The problem is:

A 40Kg stone is dropped from a height of 150m.What is the PE and KE?

a) at t= 1 second

b) at a distance of 20m

Many Thanks!

2007-09-26 03:39:39 · 1 answers · asked by xpressmuzik5 2

2007-09-26 03:03:17 · 6 answers · asked by Anonymous

A car working at a rate 500W has a maximum speed 20 m/s when travelling on the level against resistance proportional to the square if its speed. At what rate would the car have to work to double its maximum speed?

2007-09-26 02:56:24 · 2 answers · asked by Anonymous

2007-09-26 02:48:10 · 8 answers · asked by Kimo 4

which of the following does not exhibit parabolic motion?
1. a frog jumping from land into water
2. a basketball thrown into a hoop
3. a flat piece of paper released from the window
4. a baseball thrown to home plate

2007-09-26 02:11:46 · 4 answers · asked by Ayy Girl! 1

2007-09-26 02:10:13 · 7 answers · asked by Anonymous

2007-09-26 01:43:24 · 2 answers · asked by shanthi s 1

2007-09-26 01:28:41 · 2 answers · asked by thei 1

At what distance from the earth's surface will a mass of 50kg be just 481 N? (the object is on space)

how is this to be solved?

2007-09-26 01:03:47 · 1 answers · asked by The kenT 2

Just wondering. this video says a 767-200 is not capable of more then 250/300 mph at 700ft. I think there wrong, because the airliner that hit the pentagon did with such force it destroyed most of the aircraft...It had to be moving over 500mph right?
http://www.livevideo.com/video/BBEEBDC869004B4187FF33B510913286/colorado-black-forest-home-and.aspx

2007-09-26 00:37:33 · 3 answers · asked by done 3

If you had 1,000 bars of pressure and 900,000 litres of water per minute, what horse power would you be able to achive with a pelton? What is the equation to use?

2007-09-26 00:25:05 · 4 answers · asked by Anonymous

To find a resistivity of material we are using
p=RA/l (ohm-meter)
p=rho,
R=resistence of material.
l =length of a material
A=cross sectional area of material.

my question is how ohm-meter comes as final answer. because length we can mention as meter, but, cross section area of a round material will be other than meter square.
please advice me how the answer come(ohm-meter) like this.

2007-09-25 23:19:30 · 4 answers · asked by din e 1

I'm not really sure how to go about this Physics Problem.

An electrostatic potential has a maximum at point P and a minimum at point M. Are either (or both) of these points equilibrium points for a negative charge? If so are
they stable? What about for a positive charge?

That is all that is stated in the problem.
Thanks

2007-09-25 22:39:15 · 2 answers · asked by Anonymous

2007-09-25 20:08:14 · 12 answers · asked by asgoo a 1

less than, greater than, or the same as its potential energy at that point?

2007-09-25 19:31:55 · 8 answers · asked by AnonymousOne 2

Birds fly. The sun performs fusion. The earth's core performs fission. Why isn’t there a small particle or a large star skipping and jumping back and forth in time?

2007-09-25 19:16:54 · 9 answers · asked by Anonymous

hi I was thinking about the speed of light and Albert Einstein's theory of relativity. Now im not really into books and stuff and i go to an art school so this is totally out of my rage.But ill give it a shot .So lets assume that a space ship is going from point A to point B and the distance between is 1 year light.So the ship has to go at the speed of light to make it for one year to point B!! but since the theory don't allow the ship to go at the peed of the light because x factor ,,the ship will be going 70% the speed of light and it should be able to get to point B for little over a year but as the theory says ;time passes faster on earth than the space ship which is traveling at 70% the speed of light .I don't have the skills to figure it out how many years have passed on earth but a guess is 10 years.now imagine we can see the ship for all the distance it did and the ob vies answer is that we see the ship going 10 times slower than the speed of light . So what do u think????

2007-09-25 18:28:27 · 12 answers · asked by sardi p 1

water is often called the universal solvent because it deissolves most substances that are important to living things. what does this suggest about the nature of those substances?

2007-09-25 17:27:27 · 6 answers · asked by Anonymous

[b]1. The problem statement, all variables and given/known data[/b]

A positively charged particle of mass 7.40 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.38 T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 4.40 10-3 s, at which time it leaves the field heading due south. All during the motion the particle moves perpendicular to the magnetic field.

(a) What is the magnitude of the magnetic force acting on the particle?
N

(b) What is the magnitude of the charge of the particle?
C

[b]2. Relevant equations[/b]
v = 2* pi * r / T
F_c_ = mv^2 / r

Circumference = 2 * pi * r
B = F / (q*v*sin theta)

[b]3. The attempt at a solution[/b]

First I found r by using the first equation to be 58 m, but since it only went 1/4 of the way i took the the circumference (2 * 58 * 3.14) = 364.24 * .25 (1/4 of the circle was travelled) and then got lost

but then also tried this way which i really thought was right:

2007-09-25 17:14:11 · 2 answers · asked by flabbalicious 1

How long can the capacitors in small electronic equipment hold a charge after the equipment is turned off? Like small Radios, mp3 players, phones for example. After you turn off a radio, how long will the capacitor hold energy?

2007-09-25 17:07:37 · 4 answers · asked by Anonymous

A force F = 72.8 N acts at an angle = 37degrees
with respect to the horizontal on a block of
mass m = 22.3 kg, which is at rest on a
horizontal plane.
The acceleration of gravity is 9.81 m/s2 :
If the static frictional coefficient is us / 0.8,
what is the force of static friction?

2007-09-25 17:01:58 · 1 answers · asked by Jessica J 1

it seems natural that newborn infants should have lower pressure that full grown adults.

2007-09-25 16:15:00 · 2 answers · asked by Anonymous

please help it is very urgent

2007-09-25 16:04:18 · 3 answers · asked by Anonymous

Calculate the acceleration of a 1700 kg, single-engine airplane just before takeoff when the thrust of its engine is 400 N.

2007-09-25 15:39:55 · 1 answers · asked by Anonymous