Physics - April 2007

2007-04-30 11:05:57 · 5 answers · asked by zvuon 2

If gravity is mass, where does the mass come from if there is no gravity? Thats what I am confused about.

2007-04-30 11:05:31 · 4 answers · asked by Anonymous

A coin of mass m rests on a turn table a distance r from the axis rotation. The turntable rotates with a frequency of f. What is the minimum coefficient of static friction between the turntable and the coin if the coin is not to slip?
A) (4(pi^2)f^2r)/g
B) (4(pi^2)fr^2)/g
C) (4(pi)f^2r)/g
D) (4(pi)fr^2)/g

2007-04-30 10:10:16 · 2 answers · asked by lovelife22122 1

What simplest experimental physical instrument
produced a result, which was actually recognized
by Nobel prize in physics.

2007-04-30 09:31:45 · 4 answers · asked by Alexander 6

What will happen if 4 point charges +1,+1,-1,-1 initially at rest
at vertices of regular tetrahedron are simultaneously released?

2007-04-30 09:17:41 · 3 answers · asked by Alexander 6

2007-04-30 09:04:33 · 14 answers · asked by Birdman 7

I have to make a cannon for the science fair but i do not know all the things i need to make it . so please someone answer this question

2007-04-30 09:01:55 · 3 answers · asked by Anonymous

2007-04-30 09:00:19 · 2 answers · asked by jonny c 2

2007-04-30 08:26:17 · 3 answers · asked by verner66 2

2007-04-30 08:23:08 · 5 answers · asked by katie m 1

My science teacher [favorite teacher] died last Monday.

2007-04-30 07:50:49 · 4 answers · asked by Jackie 2

Need answer for expirament

2007-04-30 07:42:22 · 15 answers · asked by Anonymous

I need to work out the extension of a steel cable holding a lift that weighs 900kg, gravity is to be based at 10ms2 and the cable is 9m long and has a diameter of 10mm the youngs modulus of the cable is 210GNm2 can you help?
Its very easy but i dont know wat i am doing wrong

2007-04-30 07:15:13 · 3 answers · asked by Anonymous

If the car has a mass of 0.4 kg, the ratio of height to width of the ramp is 17/125, the initial displacement is 1.8 m, and the change in momentum is 1.4 kg*m/s, how far will it coast back up the ramp before changing directions?

2007-04-30 07:11:21 · 1 answers · asked by dietcoke 2

2007-04-30 06:56:27 · 4 answers · asked by gdog 1

A block of mass m is attached to the end of an ideal spring. Due to the weight of the block, the block remains at rest when the spring is stretched a distance from its equilibrium length. The spring has an unknown spring constant k.

1) Suppose that the block gets bumped and undergoes a small vertical displacement. Find the resulting angular frequency w of the block's oscillation about its equilibrium position.
Express the frequency in terms of given quantities and g, the magnitude of the acceleration due to gravity.
2) What is the spring constant k? answer is k=mg/h

2007-04-30 06:41:02 · 1 answers · asked by ? 1

What I want to know is that the website www.wikipedia.org says that the speed of sound is 769 mph. Would this be a measured value or a given value? (Like, 60 sec/minute)

2007-04-30 06:36:30 · 7 answers · asked by Anonymous

Will the "laser" be "pulled" by earth's gravity?

2007-04-30 06:36:05 · 3 answers · asked by MandCsDaddy 1

Two identical thin rods, each of mass m and length L, are joined at right angles to form an L-shaped object. This object is balanced on top of a sharp edge. If the object is displaced slightly, it oscillates. Assume that the magnitude of the acceleration due to gravity is g .

1) Find w, the frequency of oscillation of the object.
Your answer for the frequency may contain the given variables m and L as well as g.

2007-04-30 06:32:33 · 1 answers · asked by ? 1

2007-04-30 06:23:03 · 4 answers · asked by Backtash123 1

what is max depth the submarine can go w/o damage to porthole?

2007-04-30 06:16:17 · 5 answers · asked by Jon S 1

2007-04-30 05:45:30 · 8 answers · asked by Max M 1

I have heard that an electric field is a vector of electric charge around a charged particle and this explains its effects and boundaries. How, in practice, is the charge mediated accross the field from the source charged particle so that the particle can interact with any other charged particles that come within the field?

I have read that electrons have a wave/particle duality like light - is this how the charge passes through space within the field? If so, why does the electron wave carry no charge beyond the boundary of the electric field?

2007-04-30 05:44:24 · 3 answers · asked by Andrew H 2

Calculate the molecular formula of Arsenic sulfide when it is in the gaseous state (volume 60.5cm3 and mass 0.345) at 650C (3 sig Calculate the molecular figures)

Show reasoning.

Also show the molecular formula at 1573C (3 sig figures)( volume 0.345 and mass 242.0) I need a short setence to show how you came to the conclusion.

2007-04-30 05:37:16 · 1 answers · asked by Colin 1

what problems are associated with the long-term containment of nuclear waste? What is the current status of the disposal situation?

2007-04-30 05:25:29 · 4 answers · asked by its me 1

Two loudspeakers are placed at either end of a gymnasium, both pointing toward the center of the gym and equidistant from it. The speakers emit sound that is in phase. An observer at the center of the gym experiences constructive interference. After walking 0.29 m toward one of the speakers, the observer first experiences destructive interference
(a) Does the required distance x (to move from the constructive interference to the destructive interference) increase, decrease, or stay the same if the frequency of the speakers is lowered?


(b) Calculate x if the frequency emitted by the speakers is lowered by 4% (answer in meters)?

2007-04-30 04:48:33 · 1 answers · asked by blazedup145 1

A friend of mine had a light fixture weighing 7 pounds fall on his head at four feet. He received a head injury, but we are trying to determine how much the fixture weighed (with gravity and all) when it landed on his head. Thanks for all answers.

2007-04-30 04:46:33 · 3 answers · asked by Eric E 2

2007-04-30 04:41:46 · 5 answers · asked by raul 1

2. How fast would a muon have to be traveling relative to an observer for its lifetime as measured by this observer to be 10 times longer than its lifetime when at rest relative to the observer.

4. A computer in a laboratory requires 2.50 uS(u= Muons symbol) to make a certain calculation, as measured by a scientist in the lab. To someone moving past the lab at a relative speed of 0.995c, how long will the same calculation take?

6. If an electron is speeding down the tow mile long stanford linear accelerator at 99.98% the speed of light, how many meters long is the trip as seen from the perspective of the electron.


8. The tau is the heaviest of all the known leptons, having a mass of 1777 MeV/c². Find the rest energy of a tau in MeVs and Joules. What is the mass of the tau in kilograms? Compare your results with the mass in kilograms of an electron.

2007-04-30 04:41:24 · 1 answers · asked by Hammad A 1

A long straight cylindrical wire of .5cm radius carrying a 2A current is surrounded by a concentric cylindrical shell of .5cm thickness and inner radius 1cm carrying a 2A current in the opposite direction. The magnitude of the magnetic field, in uT, .4m from the center of the cylindrical wire is?

2007-04-30 04:27:44 · 1 answers · asked by Shane W 1