Physics - March 2007

detailed explanation plz. Actual question is: describe how radio waves, microwaves, infrared and visible light carry inforation and how these waves are processed to improve the effectiveness of the communication systems. Some1 plz help!!!

2007-03-11 09:48:32 · 1 answers · asked by Anonymous

A ball with a mass of 0.7 kg is thrown vertically into the air and has an initial
velocity of 10 m s-1. Calculate the maximum height that the ball will reach???

2007-03-11 09:24:41 · 7 answers · asked by Zoolander 1

This question i got confused at when i saw this question

2007-03-11 09:19:44 · 3 answers · asked by Slasher 2

I need to know this question quickly if anyone knows this

2007-03-11 09:18:15 · 2 answers · asked by Slasher 2

Suppose you're on a Ferris wheel at a carnival, seated 10 m from the Ferris wheel's axis. If you make a complete rotation each minute, your linear speed is?

Can anyone show me the formula for this?

2007-03-11 09:18:07 · 3 answers · asked by angelgirl 2

When an empty test tube is held slantingly in a beaker of water and viewed from above, the bottom of the test tube seems to be filled with mercury or a similar shiny liquid. If you repeat with the test tube filled with water, the mercury or shiny liquid disappear. Explain why.

Also....
If a plane mirror is hung on the wall and you are standing in front of it, then when you move towards or away from the mirror it does not affect how much of yourself you see (only a smaller or larger version of the same parts). Also, the wall or other objects behind you is affected differently. More of the rear wall can be seen the closer you are to the mirror but less when you are further away. Explain this difference.

If you can help me with these two questions, I'll give you 10 points!!

2007-03-11 08:59:09 · 1 answers · asked by fuilui213 6

2007-03-11 08:42:58 · 3 answers · asked by cesar i 1

One dimentional square well rises to infinity at x=0 & has range a & depth V1. (a)Derive the condition for spinless particle of mass m to have two & only two bound states in the well.(b)Sketch the wave function of these two states inside and outside the well and give their analytic expressions. These expressions may involve undetermined constants.

2007-03-11 08:35:26 · 1 answers · asked by suhad sbeih 1

My science teacher is making us do a project on Newton Scooters and I have no idea what I should do. We have to present it to the class. We aren't allowed to move it ourselves; it has to be moved by pushing it backward on the floor, itself, another object, or the air. We have to make it through scrap materials. Anyone have some good ideas?

2007-03-11 08:31:19 · 3 answers · asked by !mickdee 2

I want to design a plate of variable thickness and complex shape to withstand bending in two directions; what finite element analysis software do you recommend and why?
Please understand that I am old and need a really hand-holding type of help.
Any help or advice is appreciated.

2007-03-11 08:25:40 · 2 answers · asked by kellenraid 6

killed your grandfather..but then how could you be alive to kill your grandfather in the first place?

2007-03-11 08:22:44 · 10 answers · asked by Leo 3

2007-03-11 08:15:55 · 2 answers · asked by Anonymous

2007-03-11 08:13:27 · 4 answers · asked by santa_isntreal 2

I have heard that a peanut-shaped asteroid would have competing centres based around each end.

2007-03-11 08:03:16 · 5 answers · asked by Andrew H 2

1.) In a 2-dimensional Cartesian coordinate system the y-component of a given vector is equal to that vector's magnitude multiplied by which trigonometric function, with respect to the angle between vector and y-axis?

The answer is cosine...Why?

2.) A runner circles a track of radius 100 m in 100s moving at a constant rate. If the runner was initially moving north, what has been the runner's average acceleration when halfway around the track?

The answer is: 0.25 m/s^2, south...Why?

2007-03-11 08:01:09 · 5 answers · asked by Lakers 1

2007-03-11 07:55:18 · 4 answers · asked by Minxy m 2

2007-03-11 07:46:26 · 10 answers · asked by bowwifey 1

I need help with this question plese...

Compare and contrast mass ans weight using the equation from Newtons's Second Law to describe what two things weight is dependent upon.


also, do yo know this.. 2. Use the idea of conservation of momentum to explain how a rocket can move in outer space.


thank you!!

2007-03-11 07:34:05 · 2 answers · asked by nice too meet you. 4

newtons third law of motion deals with
A) one object and 2 forces
B) 2 objects and 1 force
C)2 objects and 2 forces
D) action and reaction
the answer may be more than one, meaning that the answer is each choice which makes sense

2007-03-11 07:17:17 · 8 answers · asked by ahmad 1

An electron is released a short distance above the surface of the Earth. A second electron directly below it exerts an electrostatic force on the first electron just great enough to cancel the gravitational force on it. How far below the first electron is the second?

2007-03-11 07:09:21 · 1 answers · asked by Belle 3

i have to find the meaning of the slope of a graph....what does the index of refraction times the sine of the incident angle over the sine of the refracted angle mean????

2007-03-11 07:04:58 · 1 answers · asked by Anonymous

What is the net force on the fireman??
Sum the forces in the direction of motion.

2007-03-11 06:57:17 · 2 answers · asked by Anonymous

An astronaut in space suit is motionless in outer space. The propulsion unit is strapped to her back ejects some gas with a velocity of 50 m/s. The astronaut recoils with a velocity of 1.0 m/s. If the mass of the astronaut and space suit after gas is ejected is 120 kg., the mass of the gas ejected is???

please help thanks!

2007-03-11 06:54:03 · 2 answers · asked by Anonymous

i have to diagram the following arrangement in a block on a piece of paper: a uniform bar AB weighing 6N, is 1m long and rotates about a fixed point C, which is 40 cm from AB. a weight of 3N is attached at A and an unknown weight is attached at B to produce equilibrium.
i dont know hot to draw the alst two parts of that where would i draw the weight of 3N and the unknown weight which will produce equilibrium if u knwo any sites that go in detail on this plz let me know...thanks

2007-03-11 06:51:57 · 1 answers · asked by Fatima 1

if 2 questions need to be answered for a certain physics problem which requires u to draw diagrams and the answer u get is 129.9 hoiw would u know if this is the computed magnitude or the magnitude found graphically? whats the differnce between the two?

2007-03-11 06:47:37 · 1 answers · asked by Fatima 1

a pan of boiling hot water?? random question but hey :)

2007-03-11 06:36:59 · 6 answers · asked by el_barto_ash 1

According to a physics scientist by the name of Shrogminer (or sumtin liek that) says that there are 10 + dimensions on the planet earth. The first 3 are length, width and hieght. The 4th is time. What do u think the other dimensions are? Any ideas?

2007-03-11 06:27:09 · 3 answers · asked by linkin_brandon 2

2007-03-11 06:24:46 · 5 answers · asked by Anonymous

you reach a mile marker that reads 150 and then you retrace your steps to the 175 mile marker. What is your resultant displacement from the 260 mile marker?

2007-03-11 06:14:57 · 2 answers · asked by Anonymous

Why do we see like a whole bunch of colors on a lake or in a puddle when there is oil present? Could someone explain to me cuz I am having trouble understanding it....
THANK YOU

2007-03-11 06:12:18 · 4 answers · asked by Blue Jay Z 4