Physics - July 2007

How do they make strings?

2007-07-25 05:06:47 · 5 answers · asked by bobbyampm 2

What is relative speed of the first starship with respect to the last starship?

2007-07-25 05:02:38 · 4 answers · asked by Alexander 6

2007-07-25 04:55:37 · 4 answers · asked by I.A.Khan 2

many technological application involve the twisting of circular elastic shafts .one such application is the drive shaft of an automobile in which the power from the engine is transmitted to the wheels .all of these application that involve rotational movements , are subjected to torsion or twisting ,and to a certain extent ,breakage might occur.develop the basic knowledge that determine the angle of twist and stress distribution in solid and hollow circular shaft .theories should include shear stress and strain , shear modulus , theory of torsion and its assumption , distribution of shear stress ,angle of twist

2007-07-25 04:48:48 · 1 answers · asked by peh1348 1

2007-07-25 04:47:45 · 4 answers · asked by harron s 1

2007-07-25 04:25:57 · 4 answers · asked by harron s 1

2007-07-25 04:24:32 · 9 answers · asked by Anonymous

2007-07-25 04:20:31 · 2 answers · asked by harron s 1

i want to know the chemical properties that makes them suitable over other elements

2007-07-25 04:20:26 · 2 answers · asked by Anonymous

2007-07-25 04:13:15 · 6 answers · asked by Anonymous

I just want to know the part were.
If I were to go on a space ship which travels at the speed of light for a month and come back to earth, when I arrive back my younger brother will be older then me.

Now how does that work.

2007-07-25 03:00:19 · 4 answers · asked by Anonymous

ψ1 = A sin kx

ψ2 = B exp(-kx)

Show by direct substitution into the given version of the Schrödinger equation that ψ1 and ψ2 can indeed be possible solutions of the time-independent Schrödinger equation.

2007-07-25 02:49:28 · 2 answers · asked by walt 2

2007-07-25 02:02:20 · 1 answers · asked by tedthewizard 1

under what circumstances can an object moving with aconstant speed(uniform magnitude of its velocity), still have acceleration?

second question:tell in what two basic ways the velocity of an object can change to produce an acceleration.

3rd:what change in motion is produced on a freely-falling object near Earth's surface by the acceleration due to gravity?

4th:describe the path followed by an object such as a baseball that is initially thrown horizontally near Earth's surface.(does it travel in a straight line?)

2007-07-25 01:47:56 · 2 answers · asked by genesis 1

2007-07-25 01:44:38 · 3 answers · asked by Art 2

From the back of a train travelling at 600 ft/sec. would the bullet just fall to earth.

2007-07-25 01:34:54 · 7 answers · asked by Radiator 4

Please keep the definition simple. I did a lot of searches on it but still do not understand.

2007-07-25 01:29:09 · 1 answers · asked by Anonymous

Suppose if there was a massive hole that went right through the centre of a planet, and someone dropped an object down that hole, what happens to the object? Will it come out the other side? or will it remain stationary at the centre?

2007-07-25 00:57:23 · 11 answers · asked by Anonymous

2007-07-24 22:22:17 · 3 answers · asked by BRIAN T 1

modern physics state that moving an object at (or more) the speed of light require infinite energy. This also means that if object 1 is traveling more than the speed of light compared to object 2, then object 2 can get infinite energy from object 1. But making 2 objects having a relative speed of more than the speed of light is possible like this:

Fire object1 from earth to moon with 60% speed of light. Fire object2 from moon to earth with 60% speed of light. Now compared to object 1, object2 is traveling 120% speed of light. So from object 1's point of view object 2 has infinite amount of energy. How it is? Why the contradiction?

2007-07-24 21:14:32 · 4 answers · asked by Thomas Jude 2

a brick slides down an inclined plank at a constant speed when the plank is inclined at an angle theta_0. if the angle is increased to theta_1, the block accelerates down the plank with acceleration a. the coefficient of the kinetic friction is the same in both cases.
given the two theta, calculate a.

2007-07-24 20:25:57 · 3 answers · asked by Anonymous

a typical automobile has a maximum deceleration of about 7m/s^2, the typical reaction time to engage the brakes is 0.5s. a school board sets the speed limit in the school zone to meet the condition that all cars should be able to stop at a distance of 4 m.

a. what maximum speed should be allowed for a typical automobile?

b. what fraction of the 4 m is due to the reaction time?

2007-07-24 20:13:54 · 2 answers · asked by la 1

A long straight wire lies on a horizontal table and carries an ever increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles:

a)counterclockwise in both coils
b)clockwise in both coils
c)clockwise in the east coil and counterclockwise in the west coil
d)clockwise in the west coil and counter clockwise in the east coil

WHAT??? i have no clue what this means! please help

2007-07-24 17:36:25 · 3 answers · asked by Kel 1

2007-07-24 17:34:32 · 5 answers · asked by triggrhappy0 2

What would happen at each end of the tube?

2007-07-24 17:19:09 · 3 answers · asked by sabertoothmonster 3

I would have to say "thought". My idea is that thought become things, they become matter that we experience. and so our thoughts whether it be negative or positive, will draw atoms together to create our experience of that thing. Just like thought, there are billions of possibilities existing at the same time on different levels, like energy. Thus, there are parallel universes happening at the same time.
However, being that we are physical those thoughts have a time barrier, that enables us to chose and re-chose. All the tools of electromagnetisim and general relativity are created by atoms, which combine to form a larger scale. The nucleus of those atoms contain thought. Like attracts like.Like thought attract like things or experiences.
General relativity and electromagnetisim are tools that are constant in the physical realm, that bring balance.Atoms are the energy that make things seem whole,but in fact, are constantly moving at a rate that we think something is there,but is not.

2007-07-24 17:12:31 · 4 answers · asked by Paul 2

1)If the minute hand of a big clock is 1.12 m long, find the rate at which its tip is moving in centimeters per minute.

2)Find the total area of cardboard used in making a match box, complete with the sliding portion, 4 cm long, 2.5 cm wide and 1.2 cm deep (ignore the thickness of the cardboard)

2007-07-24 17:02:27 · 11 answers · asked by sanju d 1

A uniform disk (like a record turntable) turns with a frequency of 4.8 rev/s around a frictionless spindle. A non-rotating rod of the same mass as the disk and length equal to the disk's diameter is placed on the freely spinning disk so both turn around the spindle.

a) First consider the idealized case where the rod sticks tightly to the disk immediately upon impact. How fast does the combination turn?

b) More realistically, there is a frictional force between the two surfaces such that the magnitude of the torque slowing down the disk is equal to the magnitude of the torque speeding up the rod (this is a consequence of Newton's 3rd Law.). Hence we have alpha*disk = -C alpha*rod, where alpha generically means angular acceleration. Find the constant C.

c) The disk slows and the rod speeds up until they are moving together. Find the frequency with which the combination turns in this case.

d) Suppose Idisk = .65 kg m2. What is the magnitude of the kinetic energy lost due to friction?

2007-07-24 15:41:36 · 1 answers · asked by Anonymous

This is for a little project I've been thinking about for a while and I think I know the answer, I'm just not sure.

If you have two little tiny screens about an inch or so in front of your eyes (think virtual boy for those who remember it), you can make the image appear 3D if the angles on each image are slightly different and then you project them over each other.

What do you do if you can't change the angle each image is displayed at. When they're projected over each other the angle of sight for each image is the same so it appears 2D.

Would angling the screens, rather than the images on the screens, work to correct this, and if so would the quality suffer? How could I correct any blur or at least make it better?

If you have any other suggestions please let me know. The only requirements are that any extra devices be very small and that minimum blur is achieved.

2007-07-24 15:11:56 · 2 answers · asked by caenum2 1

It couldn't bring a person to the event itself, only to a view of what it was at the time of occurrance.

2007-07-24 14:23:18 · 6 answers · asked by Chris cc 1