Physics - February 2007

The pigeon holes in the periodic table have elements arranged as per the configuration of the nucleus i.e. number of protons and neutrons. An addition of on proton changes the atom of an element to another element. Controlled fusion and fission technology does it. The production of heavy nuclides point towards this possibility. It demands high energy making the technology very costly for converting one atom to another. Availability of hydrogen cell, wind, solar energy, plasma may provide cheaper energy in near future. Does it mean it would change the present definition of finite mineral resources? The minerals would become a renewable resource and we may not need to mine for a particular ore to extract a metal as we would be able to convert one metal to another as per our requirements.

2007-02-20 03:53:15 · 16 answers · asked by mandira_nk 4

If 100 meters of telephone wire is suspended between two poles separated by 95 meters and a pelican (mass=5kg) lands midway along the wire, what is the tension in the wire due to the bird?

2007-02-20 03:51:45 · 2 answers · asked by GSU 1

How do they work? Where's a website to find out how they work?

2007-02-20 03:51:12 · 1 answers · asked by anon 2

Writing a story and need some tech data. Spisifically, envisioning a large ship mounted weapon that projects gamma rays and need some info on how this might work.

Obviously the radiation would be devistating to living things and electronic but what other effects would occure. Would a concontrated gamma ray have explosive properties like any laser weapon might?

What sort of power output might it need to, say, obliterate a 100,000 ton armored space craft in a single attack.

Also, any ideas regarding the natural shortcommings or difficulties in using such a weapon.

Any thoughts here would be helpful, thanks.

2007-02-20 03:32:11 · 3 answers · asked by Anonymous

Alrights, i'm taking the Earth Science Regents soon.. being htat im in 8th grade. My teacher gave us a packet to do over the vacation, and i was wondering about a particular quesiton. It states a student calculates the densities of five different pieces of aluminum, each having a different voulme. Which graph best represents this relationship? (1) is as volume increases, density stays the same. (2) As volume increases density decreases. (3) As volume increases density increases. (4) As volume stays the same density increases.

I know its definitely not 4. But i have this feeling it's 1, but could be 2. I know that Finding density is M/V. But If they are 5 different pieces of aluminum, each having a different volume are they going to have the same density? It doesn't state if the temperature is the same and it doesn't state what the masses are for each. I'm really thinking it's 1. Can someone help?

2007-02-20 03:16:27 · 1 answers · asked by ViVo (: 2

i am having a hard time understanding this subject...

2007-02-20 02:57:19 · 4 answers · asked by karen 2

A skier of mass 69.7 kg is pulled up a slope by a motor-driven cable.
(a) How much work is required to pull him a distance of 59.8 m up a 29.9° slope (assumed frictionless) at a constant speed of 1.90 m/s?
kJ
(b) A motor of what power is required to perform this task?
hp

2007-02-20 02:41:47 · 3 answers · asked by tnhoots 1

Need to convert from in temperature from Fahrenhiet to Celsius.

2007-02-20 02:09:36 · 13 answers · asked by Joey D 1

2007-02-20 02:04:51 · 3 answers · asked by lounilon 1

need to understand the physics about when the wind hits the fan why it rotates

2007-02-20 01:50:41 · 9 answers · asked by danny s 1

begins with p

2007-02-20 01:31:32 · 7 answers · asked by kenny 1

my phy proff forgot to post the class lectures online (we dont do lectures in class... long story) so i dont kno how to do any of the problems given on his online quiz... please help

Simulate artificial gravity in a tube shaped space station with a 192.9 m radius far from earth (earth's gravitational pull is negligible) . Choose the tangential velocity of a point on the tube such that artificial gravity of 0.9013 g results ( g is the gravitational acceleration close to the surface of the earth)

the answer is 41.29859747860695, but i dont kno how to get it, please help

2007-02-20 01:27:22 · 2 answers · asked by Paul S 2

my phy proff forgot to post the class lectures online (we dont do lectures in class... long story) so i dont kno how to do any of the problems given on his online quiz... please help

The coefficient of friction for the tire-road interface of a car is 0.2936. What is the maximum speed in km/hr the car can have in a curve with a 27.61 m radius of curvature on a level road (not banked) before the car slides off the road

answer is 32.103193273093574, but how do u get it?

2007-02-20 01:22:57 · 2 answers · asked by Paul S 2

a gun is fired from top of the hill 100mm above sea level 10 sec later.the bullet found to hit the warship1km away from gun position.determine the velocity and the angle of projection of bullet .with wat velocity the bullet strikes the warship

2007-02-20 00:59:19 · 2 answers · asked by **vinny** 2

my phy proff forgot to post the class lectures online (we dont do lectures in class... long story) so i dont kno how to do any of the problems given on his online quiz... please help

A bobsled at 162.1 km/hr turns around a curve with a 48.12 m radius of curvature on a banked ice track. What is the banking angle if banking alone (friction neglected) is to hold the sled on its track

answer is 76.89348616804996 ... but i need to understand how to get it (equation and methods)

2007-02-20 00:59:13 · 3 answers · asked by Paul S 2

my phy proff forgot to post the class lectures online (we dont do lectures in class... long story) so i dont kno how to do any of the problems given on his online quiz... please help

A planet has a radius of 6.879 x10^6 m and a mass of 6.507 x10^24 kg. What is the gravitational acceleration close to its surface.

the answer is 9.17183053374108 but i need help on how to you get that answer

2007-02-20 00:51:30 · 3 answers · asked by Paul S 2

2007-02-19 23:45:26 · 2 answers · asked by recidivist 2

2007-02-19 23:23:18 · 8 answers · asked by klark kent 1

A brick is thrown upward from the top of a building at an angle of 15° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 3.2 s, how tall is the building?
____m

I know the answer is 37.75 but I can't figure out how it is done. Will someone work this out for me and explain what you are doing. And if possible can you use the equations I put below, as those are the ones we use in class.

V=at+V0
(X-X0)=1/2 (V+V0)t
V^2=V0^2 + 2a (X-X0)
X-X0=1/2 at^2 + V0t

You can use the equations one for y and one of x if you need as im not sure how to do it...but any help would be appreciated. thanks

2007-02-19 23:03:58 · 3 answers · asked by Anonymous

2007-02-19 21:44:09 · 20 answers · asked by Anonymous

2007-02-19 21:42:53 · 9 answers · asked by Anonymous

2007-02-19 21:35:14 · 6 answers · asked by Anonymous

2007-02-19 21:17:15 · 2 answers · asked by M 1

If so, how? I want an electromagnetic that size with the magnetic power of a rare earth magnet roughly the same size

2007-02-19 21:09:58 · 2 answers · asked by M 1

I reckon not cos if you were falling @ 40mph you would have to jump up at 40mph to be at zero

2007-02-19 21:03:26 · 18 answers · asked by Anonymous

at10m/s and 4m/s.How will we find out when they will collide?(plzz give process and answer)

2007-02-19 21:00:31 · 2 answers · asked by rhiju_talukdar 1

2007-02-19 20:55:03 · 2 answers · asked by kat 1

2007-02-19 20:38:52 · 1 answers · asked by Raj 1

I am reading Richard Feynman's QED and am a bit confused. If light consists of photon particles, then are all photons particles of light? What is the implication of this?

2007-02-19 20:35:50 · 3 answers · asked by AnnedeCroix 1

2007-02-19 20:31:55 · 10 answers · asked by silent1 4