Physics - October 2007

At an altitude of 10000m (about 33000 ft.), the air pressure outside the airplane is only 2.7 x 10 to the 4th power N/m squared, while inside is still at normal atmospheric pressure, due to pressurization of the cabin. Calculate the net force due to the air pressures on a door of area 3.0 m squared. If you can show me how you got the answer so I understand it I'd appreciate it.. Thank you

2007-10-29 03:57:16 · 2 answers · asked by Anonymous

if light passes through a prism or some other obsticle, is it "injured" from this or does it just go on divided in each of the color spectrums?

2007-10-29 03:54:48 · 2 answers · asked by ? 6

(question continued) "from a hot solution?"

2007-10-29 03:50:34 · 1 answers · asked by Anonymous

45 cm height by an outside supply. a) What is the speed of the water out of each hole? b) Which water stream has the greatest range relative to the base of the container? If you could show me the process of getting the answer so I understand it I'd appreciate it. Thank you

2007-10-29 03:34:58 · 1 answers · asked by Anonymous

2007-10-29 02:49:49 · 3 answers · asked by harry potter 2

Superball Hits Wall Figure 7-24 shows an approximate plot of force magnitude versus time during the collision of a 60 g Superball with a wall. The initial velocity of the ball is 32 m/s perpendicular to the wall. It rebounds directly back with approximately the same speed, also perpendicular to the wall. What is Fmax, the maximum magnitude of the force on the ball during the collision?

Figure 7-24:
http://i234.photobucket.com/albums/ee9/locowise/10_32.gif

Thanks in advance for any help you can offer!

2007-10-29 02:36:54 · 3 answers · asked by locowise 2

The law of inertia states that no forces is required to maintain motion. Why do we have to keep pedaling the bicycle to maintain motion?

2007-10-29 02:01:43 · 5 answers · asked by pucchihime 1

are this becouse of miss understanding of the real meaning of time

2007-10-29 01:46:45 · 3 answers · asked by zoom 1

2007-10-29 01:41:14 · 3 answers · asked by Honor 2

A student sits at rest on a piano stool that can rotate. The moment of inertia of the student-stool system is 4.1 kg·m2. A second student tosses a 1.5 kg mass with a speed of 2.2 m/s to the student on the stool, who catches it at a distance of 0.37 m from the axis of rotation. The final angular speed is 0.284 rad/s. Calculate the initial and final kinetic energy of the system.

2007-10-29 01:08:30 · 1 answers · asked by Anonymous

which of the following is used to produce x ray:
(1) electron
(2) photon
(3) cathod ray
(4) alpha ray

2007-10-29 01:07:13 · 3 answers · asked by Anonymous

2007-10-29 00:43:45 · 3 answers · asked by Anonymous

2007-10-29 00:29:26 · 3 answers · asked by Calchas 3

2007-10-29 00:27:52 · 6 answers · asked by Anonymous

2007-10-28 23:00:12 · 8 answers · asked by J A S 4

2007-10-28 22:29:37 · 7 answers · asked by I.Suresh N 1

2007-10-28 21:53:20 · 4 answers · asked by Anonymous

I was wondering what are the limits of how far we can zoom in on the micro universe? Could we ever expect to find an end to the structure of an atom? I keep thinking about the macro universe and there is seemingly no end could we expect this in the micro universe if someone developed a way to peer further into the atom?

2007-10-28 21:29:23 · 1 answers · asked by Balrog 2

speed is 7.70m/s.

A.) Determine the magnitude of his acceleration ,assumed to be constant.

B.) If he ramp is inclined at 25degrees with respect to the ground,what is the component of his acceleration that is parallel to the ground?


I would gladly appreciate your help,thank you.

2007-10-28 20:51:36 · 1 answers · asked by Jay 1

An anemometer for measuring wind speed consists of four metal cups, each of mass m = 104 g, mounted on the ends of four essentially massless rods of length R= 0.3 m. The rods are at right angles to each other and the structure rigidly rotates at f = 12 rev/s. Treat the cups as point masses. What is the angular momentum of the anemometer about the rotation axis? I already figured out I is 37.44 but now I'm stuck anybody now what L is?

2007-10-28 20:33:32 · 2 answers · asked by c_me_run2005 2

Melting and Boiling points do depend on surrounding pressure. So, almost zero pressure might influence the melting phenomenon.

2007-10-28 19:47:38 · 13 answers · asked by dilip 1

2007-10-28 19:36:58 · 6 answers · asked by Balrog 2

2007-10-28 19:34:14 · 2 answers · asked by Arianna 1

Four point masses of 3.6 kg each are arranged in a square on massless rods. The length of a side of the square is d = 0.60 m.


(a) What is the rotational inertia for rotation about an axis passing through masses B and C?
kg·m2

(b) What is the rotational inertia for rotation about an axis passing through masses A and C?
kg·m2

(c) What is the rotational inertia for rotation about an axis passing through the center of the square and perpendicular to the plane of the square?


Point A is the top left corner of the square, point B is the top right corner of the square, point C is the bottom right corner of the square and point D is the bottom left corner of the square.

2007-10-28 19:05:59 · 2 answers · asked by Anonymous

There must be millions of tires made and they all wear down.
So there must be tons of rubber particles along side roads.
Where is it all? What happens to it? Does it become dust?
Do we breath it?Why can't we see all those tons of accumulated particles?

2007-10-28 17:50:24 · 1 answers · asked by Mark K 6

a person pulls a toboggan for a distance of 35.0 m along the snow with a rope directed 25 degrees above the snow. the tension in the rope is 94.0 N. [A] how much work is done on the toboggan by the tension force? [B] how much work is done if the same tension is directed parallel to the snow?

2007-10-28 17:01:53 · 1 answers · asked by Amy C 1

I've missed the last 2 lectures for my physics course all I have is a printout of the problem w/o a book to read over. Can someone please answer these questions and provide some feedback as to what/why. Thanks:)

(a) An elevator of mass m moving upward has two forces
acting on it: the upward force of tension, cable and the downward of gravity. When the elevator is accelerating upward, which is greater, T or w?
(b) When the elevator is moving at a constant velocity upward, which is greater, T or w?
(c) When the elevator is moving upward, but the acceleration downward, greater? T or w?
(d) Let the elevator have a mass of 1500 kg and an upward acceleration of 2.5 m/s2. Find T. Is answer consistent with answer to part (a)?
(e) The elevator of part (d) now moves with a constant upward velocity of 10 m/s. Find T. Is your answer consistent with your answer to part (b)?
(f) Having initially moved upward w/a constant velocity, the elevator begins to accelerate downward at 1.5m/s2. Find T

2007-10-28 16:40:42 · 1 answers · asked by Anonymous

2007-10-28 16:22:35 · 4 answers · asked by S A M 1

Body A of mass M has an original velocity of 6.2 m/s in the +x-direction toward a stationary body (body B) of the same mass. After the collision, body A has velocity components of 1.1 m/s in the +x-direction and 2.1 m/s in the +y-direction. What is the magnitude of body B's velocity after the collision?
________m/s

I tried and got 3 but that is not right.. please explain how to do this!

2007-10-28 16:21:15 · 2 answers · asked by ? 2

It requires two rings of satellites in orbit. The inner ring would be geostationary & transmit its generated energy to a surface relay station, it ability to transmit automatically shut off if it fails to receive the feedback signal from the relay station that tells it it's still properly aligned (wouldn't want a trail of scorched earth if one of them happened to drift off course).

The outer band would consist of copper-bearing satellites set to orbit in the opposite direction and as quickly as possible.

In short, spinning magnetic field + metal surrounding it = electricity. The only way it would possibly run out is if the Earth stopped spinning on its axis, in which event we'd have more than energy needs to worry about.

I call this a "Faraday Belt". Would it work?

2007-10-28 16:17:20 · 4 answers · asked by uncleclover 5