Physics - July 2007

i have given 3 cases below. I just want you to explain, in which of the cases will my weight be the maximum..

1). i am standing on earths surface
2). i am standing 200m the earths crust
3). i am standing 200m away from the earths crust in the atmosphere....

2007-07-23 13:53:11 · 3 answers · asked by Kalpak I 2

2007-07-23 13:45:23 · 8 answers · asked by hawaianprincess15 1

2007-07-23 13:41:04 · 5 answers · asked by jarynth3 1

1 Two student, Lee and Melanie, each hold a solid object. Lee has solid object A and Melanie has solid object B. The students make the following observations:

Larry: "My object has three times the mass of object B and since density is directly proportional to mass, my object has 3 times the density of object B."

Melanie: "My object takes up 1/3 of the volume of object A, and since density is inversely proportional to mass, my object is 3 times as dense as object A."

a) which student, if either, is correct?

b) If the statements about the mass and the volumes of each object are correct, how do the densities of each object compare?

2007-07-23 12:59:18 · 4 answers · asked by sunshinegirl93534 2

So i wanna convert the kinetic energy of a spinning disc (like a motor) to a electrical energy (in electricity).... Please explain me it detailed. Thanks

2007-07-23 12:56:09 · 2 answers · asked by Anonymous

ive done this since i was little. if you have a bubble sitting on flat surface blow on it very lightly so the rainbow colors swirl. then if you stay real still its when the bubble loses color (i say black) it pops. I asked a chemistry teacher this and he said there was an experiment on this but i cant remember the name. something about light and the rainbow. cant fine full explanation.

2007-07-23 11:40:43 · 4 answers · asked by usexythangu 2

is contained inside a cylinder under weightless piston.
The temepreture of ambient air is 27C and pressure is 1atm.

The mix inside the ballon is ignited and exploded, but cylinder was strong enough and remained undamaged. After some time thermal equilbruim was restored.


What is then new volume under the piston?

2007-07-23 11:31:23 · 4 answers · asked by Alexander 6

To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, so a sharp image always falls on the film. A camera with a telephoto lens (f = 280 mm) is to be focused on an object located first at a distance of 3.71 m and then at 46.1 m. Over what distance must the lens be movable?

2007-07-23 11:06:53 · 2 answers · asked by Anonymous

….and light is just part of the electro-magnetic spectrum, does that mean that all EM radiation is made up of photons?

When reading about photons, I only recall them being mentioned in relation to light. If they are only peculiar to that tiny part of the EMR spectrum, I am confused.

2007-07-23 11:05:18 · 5 answers · asked by nick s 6

A movie camera has a converging lens with a focal length of 88.0 mm. It takes a picture of a 169 cm tall person standing 15.6 m away. What is the height of the image on the film?

2007-07-23 11:03:45 · 1 answers · asked by Anonymous

Electic motor plugged into electric socket with frequency 60 Hz and ajustable voltage.
Initially voltage is set at Uo = 100V.

The motor draws current Io = 1A,
and consumes power Po = 60W.

During the operation resistance of wire
in motor coils increased by ∆R = 90 Ohm
due to overheating.

To what new value U1 should the voltage
be adjusted, if we want the motor to operate
under the same load wth the same RPM?

2007-07-23 10:54:58 · 2 answers · asked by Alexander 6

2007-07-23 10:38:15 · 14 answers · asked by tommypalmer0 1

For example what is the greatest distance a person can hear a shot fired from a M110 howitzer canon?
M110 howitzer can fire a shot up to 30Km(18.75 miles), I want to know if it's possiple to hear a shot such as this one from more then 5 miles (or 8Km0?

2007-07-23 09:32:06 · 3 answers · asked by isnyca18 1

Is it possible to measure gravitational acceleration 'g' near the earth's surface using a centrifuge? Someone told me that if you put a small object like a pebble in a centrifuge, start the centrifuge off at a high speed, and slowly lower the angular speed. At the speed the pebble falls out, the gravitational acceleration will equal omega squared times r (radius); is this valid? (omega is angular speed, the derivate of the angle with respect to time, or 2pi radians/period if angular speed is constant)

I do not think so, because the force here is the frictional force between pebble and centrifuge, and not the gravitational force.

Also, If you swing anything in a vertical, circular pattern, anything inside of it will experience two forces at the top of the arc. If the measurable, centrifugal force is less than the force of gravity, the object will fall. Is this correct? If so, can this be used to measure 'g'?

If not, is there a way to measure 'g' using a centrifuge? Thank-you.

2007-07-23 09:08:12 · 4 answers · asked by qspeechc 4

A baseball player slides into third base. As he's sliding, which one of the following force does NOT act on him?

1) static friction

2) kinetic friction

3) normal force

4) weight

5) all of the above forces act on him

2007-07-23 08:55:54 · 19 answers · asked by Anonymous

Why is it that when a car is moving and there is a bug flying around in the car, that the bug is fine? Shouldn't it hit the back of the vehicle as soon as the car starts driving?

2007-07-23 07:48:38 · 18 answers · asked by Amanda 2

if g force is gravity then why does it pull you to the side when gravity normaly pulls you down

2007-07-23 07:39:29 · 8 answers · asked by Anonymous

Two pucks m1=m2=1kg connected by a string L=1m slide on frictionless ice. Initial velocites v1=2v2=2m/s in direction perpendicular to the string.

O --------2m/s-------->
|
|
|
1m
|
|
|
O---1m/s--->

2007-07-23 07:35:01 · 3 answers · asked by Alexander 6

and what whould it take to get a signal from another dimension?

2007-07-23 07:32:49 · 3 answers · asked by john constantine 2

Is this a myth? I understand somewhat the physics behind falling from heights, but this sounded ridiculous when I was a kid, and sounds even more ridiculous now.
Maybe I'm not remembering the theory as it was originally told.

2007-07-23 06:54:01 · 16 answers · asked by johnpnj 2

Nickel is ferro magnetic in nature. But when it is added with stainless steel, it makes stainless steel non-magnetic. What is the structural changes happened with the presence of nickel?

2007-07-23 06:43:24 · 0 answers · asked by lan 2

2007-07-23 06:03:56 · 2 answers · asked by Anonymous

2007-07-23 05:59:19 · 4 answers · asked by Anonymous

I think I have just created a magnetic capacitor. it wasn't what I was origanly trying to make. but through some weird serendipity it seems that I have. I think I have because I'm getting a magnetic field way stronger than I should be able to create with the voltages I'm using. and it comes in pulses. but my question is. is there anything that says it is physically imposable to make a magnetic capacitor. so I know I'm not mistaken with my assumption

2007-07-23 05:41:56 · 2 answers · asked by john m 2

The magnetic field perpendicular to a single 10.1 cm diameter circular loop of copper wire decreases uniformly from 0.780 T to zero. If the wire is 2.05 mm in diameter, how much charge moves past a point in the coil during this operation?

2007-07-23 05:32:25 · 1 answers · asked by Anonymous

if you shine a powerful Laser into another Laser, would the photons be destroyed ?

2007-07-23 05:31:23 · 7 answers · asked by ronaldmallier 1

(a)melt
(b)sublime
(c)condense
(d)evaporate
(e)fuse

2007-07-23 05:15:44 · 5 answers · asked by Tam 1

2007-07-23 04:57:38 · 12 answers · asked by Mohit C 1

before couble years i read something about that and i tried it but imagining my self with light brown eyes(i had black eyes)and i kept imagining my self then after 3 monthes my eyes begain to be lighter and lighter then they became light brown eyes so do u thing that is true or not

2007-07-23 04:52:16 · 3 answers · asked by MADELINE 2 1

If this simulation was real, what would be the speed of the shells when they hit their target? (meters per second)

http://www.youtube.com/watch?v=NZReuMyPxXM

What would hit the target first, the shells or the sound of the cannon? (make your own estimates)

http://answers.yahoo.com/question/index;_ylt=Aj.J_k7JSRrE0FBumMbSRfzsy6IX?qid=20070723070003AAOojxc


Bonus Question:
Each shell would have the same momentum as a 16 pound bowling ball travelling at what speed on impact?

http://answers.yahoo.com/question/index?qid=20070723065912AAJZBhc&r=w

.

2007-07-23 04:51:03 · 1 answers · asked by Anonymous