Physics - August 2007

A car travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs. What is the distance travelled?

2007-08-07 04:09:09 · 4 answers · asked by Lolla 2

I would like to know the physics behind it.

2007-08-07 04:03:10 · 9 answers · asked by Dev 2

Does the energy carried by the electrons remain as same as when potetial was 11kv or decreases. 10 Mwatt electricity is produced.

2007-08-07 03:52:46 · 3 answers · asked by sarita s 1

Please no fancy university jargon.

2007-08-07 03:45:28 · 5 answers · asked by Anonymous

Imagine this scenario. A regular 60 to 100 Watt light bulb that turns on and off @ maybe 6 to 12 times an hour. How long will the life span be? Will it make a difference if the switch was linear instead of a pulse? Linear means slowly reaches the AC voltage level (120 or 220 won't really make a difference), and then, slowly go down till it reaches Zero voltage. Pulse means it's 220 volts one second and then it's zero.

2007-08-07 02:52:18 · 4 answers · asked by Abdallah A 3

A. Rods and cones
B. Lens
C. Cornea
D. Pupil
E. Retina

2007-08-07 02:38:55 · 12 answers · asked by Anonymous

Are we not dealing with both solid AND fluid mechanics if you consider the pounds per square inch of inflation?

2007-08-07 02:06:24 · 1 answers · asked by m8riqs 1

2007-08-07 00:16:56 · 20 answers · asked by lala 1

I want to use the Pogrammable Logic Controller in a vehicle application project, but the vehicle has a 12volt battery, and the PLC requires 24volt DC. I don't want to use an inverter to get up to 240v AC, and then a rectified transformer to get back down to 12v DC, there must be a way to get from 12v DC to 24v DC by a more direct route. Does anybody know of a workable and cheap solution? PLCs consume very little power themselves, their inputs and outputs can use the vehicle 12v DC.

2007-08-07 00:08:56 · 3 answers · asked by Valmiki 4

2007-08-06 22:57:20 · 2 answers · asked by Anonymous

2007-08-06 21:44:11 · 5 answers · asked by czarie09 1

here it is: 1 kg of water is heated together with 1 kg of iron. which of these two would require a greater amount of heat?

correct me if i'm wrong. this is what i think: water would require a greater heat because it has a greater heat capacity.

2007-08-06 21:38:40 · 5 answers · asked by lahdeedah20 1

A tennis ball with a speed of 10.0m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 8.0m/s. If the ball is in contact with the wall for .012s, what is the average acceleration of the ball while in contact with the wall?

2007-08-06 18:27:50 · 4 answers · asked by sara.girl122 1

casimir force acts opposite to quantom force which causes friction.

2007-08-06 18:10:14 · 4 answers · asked by jake 1

I want to know what new has come of the Theory of Everything and where to talk to the people who are making an impact into this Next Level of Physics.

2007-08-06 18:03:52 · 4 answers · asked by eyeson_info 2

2007-08-06 17:39:12 · 2 answers · asked by mr_sel_vam06 1

So energy cannot be created or destroyed but if a satellite with a metal wires orbits around the earth with its electrical field a very large amount of energy is created while it is not getting transfered from anything. The satellite does not slow down or have any complications beside gaining electricity.
Please try to answer this because is sincerely beleive it breaks the law of conservation of energy

2007-08-06 17:34:31 · 5 answers · asked by fresh master ness 1

I want to convert a table to a formula by using orderd equqtions.may need to change the degree of equations and so dimension of matrixes. guide me. thanks

2007-08-06 17:18:36 · 5 answers · asked by m g 1

If you are traveling the speed of light on a car and suddenly brake to a full stop... what happens to your tail lights?

2007-08-06 17:04:25 · 7 answers · asked by Anonymous

A question was asked to me about Newton's law of motion. It asked, "Supposing you were in space in a weightless environment, would it require a force to set an object in motion?" My initial thought was that in space, there is no gravity or friction, and therefore an object would stay in motion forever. However, it was revealed to me that force is still required to move an object in space and that the object still has inertia, which resists change in motion. But my initial thought still stands. So I guess my question is: Can an object be in a perfectly still state in space?

2007-08-06 16:32:04 · 13 answers · asked by Anonymous

If a person develops unification and makes a Grand Theory of Everything, what will society treat that person like? Will they love the person or hate the person? Will they be famous or infamous and etc?

2007-08-06 16:07:42 · 9 answers · asked by Anonymous

1) find the magnitude of the magnetic force on a proton moving with velocity 4.46 Mm/s in the positive x direction in a magnetic field of 1.85 T in the positive z direction. Answer in units of pN.

I got 9.33495 x10^-34, but im not sure if I am correct.

2007-08-06 15:25:03 · 1 answers · asked by Anonymous

1) Two parallel copper rods are 1.3 cm apart. Lightning sends a 16 kA pulse of current along each conductor. The permeability of free space is 1.25664 x 10^-6 N/ A^2. Calculated the force per unit length on one conductor. Answer in units of N/m.

2007-08-06 15:20:16 · 2 answers · asked by jay b 1

2) A long straight wire carries a current of 13.9 A. An electron travels at 24400 m/s parallel to the wire, 52.2 cm from the wire. The permeability of free space is 1.25664 x 10^-6 N/A2 and the charge on an electron is 1.6 x10^-19 C. What force does the magnetic field of the current exert on the moving electron? Answer in units of N...

2007-08-06 14:54:08 · 2 answers · asked by jay b 1

2007-08-06 14:50:50 · 8 answers · asked by bahaiking 2

I saw a movie called "what the bleep do we know??" which claims through quantum physics (I dont want to elaborate as i am afraid i make a mistake and make you miss the point of my question) you can, alter some events and do things like a telekinetik person would claim he could do, like moving objects without physical contact. Is this at least discussed on the scientific communitty or is it just plain old BS?

2007-08-06 14:34:18 · 3 answers · asked by Anonymous

please explain or give an example?

2007-08-06 14:25:30 · 9 answers · asked by sara.girl122 1

Ok, so I got some answers on my previous question, but I'm still confused.
The complete question I have to answer is as follows:
- Which has greater momentum, a 1 ton care moving at 50km/hr or a 2 ton truck at 25km/hr?
- If the car and truck move in opposite directions what is the car's momentum in regards to the truck and vice versa. Why does the momentum differ from the first case?

I know that momentum = m*v, so I can figure out the first part of the question, but why is my professor stating in his last sentence that the momentum will differ if they're going in opposite directions?

I'm confused....Please help.... ;-)

2007-08-06 11:19:42 · 4 answers · asked by Camilla 2

Initial speed of the tachyon is 2c.

2007-08-06 11:08:06 · 3 answers · asked by Alexander 6

A 1 ton car is going 50km/hr in the OPPOSITE direction from a 2 ton truck moving at 25km/hr, what vehicle has the greater momentum and why?

2007-08-06 10:51:31 · 5 answers · asked by Camilla 2