Physics - April 2007

click on the link for the 2 pictures....
from the pictures i have given.....

picture 1

http://i33.photobucket.com/albums/d69/EHSwrestler1/chap12_pzl_1.jpg

picture2

http://i33.photobucket.com/albums/d69/EHSwrestler1/chap12_pzl_2.jpg

Consider the following three cases?



Static case with arms not extended (first picture.)
Theoretically, could this position be maintained on a frictionless surface?

Static case with arms extended (second picture.)
Theoretically, could this position be maintained on a frictionless surface?

Transition between the static positions, Dave extends his arms and moves Demoise outward.
Theoretically, could this move be accomplished on a frictionless surface?

2007-04-27 06:23:21 · 3 answers · asked by studmuffin 1

2007-04-27 06:21:11 · 1 answers · asked by Syliva P 1

Okay so in school we're making a rocket..and the top is cone shaped but someone told me that's not good..so i was wondering
do you guys know what the best shape for the top of the rocket is?..so it goes higher?

2007-04-27 06:21:11 · 3 answers · asked by pYaRi::.. 1

Natural magnetic monopoles those that occur in nature and are experienced on a macro scale everyday are do exist..in a bar magnet for example there is a distinct N and S pole on the magnet. To establish a mono polic phenonmena in a magnetized material..one simply nuetralizes one of the two poles of the magnet. by turning the magnetic field on itself. configure a precise sphereoid with all the outward surfaces of the sphere being of one particular polarity say N for example the other polarity would be within the core of the sphere and would be masked to the outside world by the outward facing Polarity. therefore the sphere would be N magnetic polarity in all directions in this example ,..thus a monopolic effect would be expressed by the sphere in referance to the Environment in which it is placed..

2007-04-27 05:39:45 · 4 answers · asked by Joseph 2

a 5gram bullet is shot through a 1kg wood block suspended on a string 2.000m long. The center of mass of the block rises a distance of .45cm. Find the speed of the bullet as it emerges from the block if it's initial speed is 450m/s.

2007-04-27 05:17:00 · 6 answers · asked by smiley25 2

2007-04-27 04:41:06 · 1 answers · asked by mike 1

why does the linear spectrum emitted ONLY in seprate atoms or gaseous state under low pressure?

2007-04-27 03:54:01 · 1 answers · asked by Anonymous

Face two quarters on a table with their rims touching. While holding one quarter fixed, roll the other one-without slipping-around the circumference of the fixed quarter until it has completed one round trip. How many revolutions has the rolling quarter made about its center?

2007-04-27 03:24:26 · 2 answers · asked by Dan 1

please be an experiment!!!!!!!!!!

2007-04-27 03:22:53 · 9 answers · asked by katie 2

I'm reading a book called the Quantum Society by Danah Zohar and she suggest that quantum physics enters many areas of real life.
She talks a lot about the wave of infinite possibilites (like an infinite shrodinger's cat) collapsing into one possibility. Such as deciding upon one course of action out of many ideas. Composing one particlar melody from the myriad of possible notes and timings. Me writing this particular sentence out of all the things i could have said.
She also suggests that these kinds of wave function collapses happen on other levels like in evolution, where genes show a prediposition to evolve beyond mere chance - as in the work of adaptive biology of J Cairns.
I'm a beginner with all this but it's got me thinking. Zohar even suggested that as measurement can collapse a wave function, perhaps it's our very attitudes that are an equivalent of the measurement and partially create the reality that we experience.

2007-04-27 01:23:27 · 2 answers · asked by tom t 1

2007-04-26 21:43:34 · 4 answers · asked by yemisi 2

2007-04-26 21:42:39 · 2 answers · asked by yemisi 2

Does the equation V=Ed apply only to parallel plates, or can it be used for charged suspended objects as well.

2007-04-26 19:44:29 · 2 answers · asked by spiffy_mcbang13 1

Velocity is:

A. the same as speed
B. time divided by distance
C. speed with direction
D. change in accleration

2007-04-26 19:40:05 · 6 answers · asked by Anonymous

Speed is:

A. a measure of how fast something is moving
B. the distance covered per unit time
C. always measured in terms of a unit of distance divided by a unit of time
D. all of the above

2007-04-26 19:26:10 · 5 answers · asked by Anonymous

2007-04-26 19:23:00 · 15 answers · asked by Dread_66 2

A heat pump is used to heat a house with an interior temperature of 20.4°C. On a chilly day with an outdoor temperature of -10.9°C, what is the minimum work that the pump requires in order to deliver 1.3 kJ of heat to the house?

2007-04-26 19:17:04 · 1 answers · asked by Anonymous

An engine works at 23% efficiency. The engine raises a 7-kg crate from rest to a vertical height of 9 m, at which point the crate has a speed of 4 m/s. How much heat input is required for this engine?

2007-04-26 19:16:03 · 2 answers · asked by Anonymous

Acceleration is defined as the change in:


A. time it takes to move from one place to another place
B. distance divided by the time interval
C. velocity divided by the time interval
D. time it takes to move from one speed to another speed

2007-04-26 19:05:39 · 6 answers · asked by Anonymous

Ice at 0.0°C is mixed with 5 × 10^2 mL of water at 28°C. How much ice must melt to lower the water temperature to 0.0°C?

i've done this kind of problem before given the amount of water in g, but how do you do it when given in mL??

thanks!!

2007-04-26 18:17:04 · 3 answers · asked by Anonymous

We know that light (photons) has a specific velocity, so does sound waves, and other forms of radiation like X Rays,, gamma rays, etc,, What do you think decides these velocities? .. All of the above are some form of radiation or transmission of energy in some form or another, so at the quantum level (as far as I know) they are not composed of particles that vary significantly in mass..

This being the case, what factor decides that light should have the higher velocity than others?... if this is known, is it possible to engineer a form of radiation that exceeds the speed of light?

2007-04-26 17:12:48 · 4 answers · asked by Anonymous

I'm guessing there are some people here who know of Schrodenger's cat. Has anyone read Schrodenger's rabbits?
Using the simplest particles of which our universe is built, the photon and the electron, the basic units of light and matter. Measuring the spin of an electron, or the polarization of a photon—seemingly has an instantaneous effect on the outcome of a measurement of another particle some distance away.
The formal name for this puzzle is the EPR paradox, after its originators Einstein, Podolsky, and Rosen. It is the most puzzling feature of the modern formulation of physics known as quantum theory. For half a century, attempts by physicists and philosophers to explain this behavior have verged on the bizarre.
This implies a signal can be sent instanteously anywhere in the universe. Anyone know of the latest info on this subject?

2007-04-26 16:58:12 · 11 answers · asked by Anonymous

A disk and a hoop of the same mass and radius are released at the same time at the top of an inclined plane

(a) Calculate the speed of the disk at the bottom of the inclined plane if the height of the incline is 0.84 m.

(b) Calculate the speed of the hoop at the bottom of the inclined plane if the height of the incline is 0.84 m.

2007-04-26 16:38:47 · 2 answers · asked by AnDrew 1

An object at rest begins to rotate with a constant angular acceleration. If the angular speed of the object is after the time t, what was its angular speed (in terms of ) at the time t/2?

2007-04-26 16:35:36 · 2 answers · asked by Dan 1

A 63.8 kg canoeist stands in the middle of her canoe. The canoe is 3.6 m long, and the end that is closest to land is 2.5 m from the shore. The canoeist now walks toward the shore until she comes to the end of the canoe. Suppose the canoeist is 3.4 m from shore when she reaches the end of her canoe. What is the canoe's mass?

2007-04-26 16:34:53 · 1 answers · asked by Dan 1

A child sits in a wagon with a pile of 0.42 kg rocks. If she can throw each rock with a speed of 14 m/s relative to the ground, causing the wagon to move, how many rocks must she throw per minute to maintain a constant average speed against a 3.1 N force of friction?

2007-04-26 16:34:06 · 1 answers · asked by Anonymous

A 15.0 g marble is dropped from rest onto the floor 1.39 m below.

(a) If the marble bounces straight upward to a height of 0.580 m, what is the magnitude and direction of the impulse delivered to the marble by the floor? (Use a positive sign for the up direction, negative for down.)

2007-04-26 16:31:43 · 1 answers · asked by Anonymous

A 220 g ball falls vertically downward, hitting the floor with a speed of 2.9 m/s and rebounding upward with a speed of 2.0 m/s.

(a) Find the magnitude of the change in the ball's momentum. (Let up be in the positive direction.)

(b) Find the change in the magnitude of the ball's momentum. (Let negative values indicate a decrease in magnitude.)

2007-04-26 16:31:18 · 2 answers · asked by Anonymous

A metal soda can of uniform composition has a mass of 0.140 kg and is 12.0 cm tall. The can is filled with 1.31 kg of soda. Then small holes are drilled in the top and bottom (with negligible loss of metal) to drain the soda. What is the height h of the center of mass of the can and contents (a) intially and (b) after the can loses all the soda? (c) What happens to h as the soda drains out? (d) If x is the height of the remaining soda at any given instant, find x when the center of mass reaches its lowest point.

2007-04-26 15:47:41 · 2 answers · asked by H.A. 2

An incandescent lightbulb has a tungsten filament that is heated to a temperature of 3 × 103 K when an electric current passes through it. If the surface area of the filament is approximately 1.00 × 10-4 m2 and it has an emissivity of 0.36, what is the power radiated by the bulb?

2007-04-26 15:34:54 · 1 answers · asked by Anonymous