Physics - February 2007

where is the largest particle accelerator in the world

2007-02-11 08:34:39 · 8 answers · asked by keirah™Ƹ̵̡Ӝ̵̨̄Ʒ 6

what is dark matter

2007-02-11 08:33:12 · 7 answers · asked by keirah™Ƹ̵̡Ӝ̵̨̄Ʒ 6

Given two Vectors F1 and F2. where the magnitude of these vectors are F1= 59N and F2 =77N and where θ1=138degree and θ2= 264degree. the anngles are measure from the positive x-axis with counter-clockwise angular direction as positive.

1.) what is the magnitude of the resultant vector װFװ, where F=F1+F2. answer in units of N

2.) give the angle in degree, use counter-clockwise as the positive angular direction, between the limits of -180 degree and +180 degree from the positive x-axis. what is the direction of this resultant vectior F? answer in degree

plese help i'm lost

2007-02-11 08:30:06 · 1 answers · asked by i.p 1

2007-02-11 08:24:43 · 2 answers · asked by championsharon 2

1. A structural steel has an allowable stree of 21, 600 psi. Express this in pascals.

2. An electric motor shaft roatoes at 1750 rpm. Express the rotational speed in radians per second.

3. An allowable deformation of a certain beam is .080 in. Express the deformation in millimeters.

4. Compute the area of a rod having a diameter of .505 in. in square inches. Theh convert the result to square millimeters.

We were given 10 questionns and those 4 i'm having trouble with figuring out how to solve.. please helpp

2007-02-11 08:18:51 · 1 answers · asked by Anonymous

a speed of 30 meters when it hits the ground?

A. at the instant the block was released what was its gravitational potential energy with respect to the ground.

b.what is the kinetic energy
c how much mechanical energy was lost by the block as it fell
d what happen to the mechanial energy lost by the block

2007-02-11 07:58:44 · 1 answers · asked by Anonymous

A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.40 m/s and her body makes an angle of 71.0° with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude and direction.

2007-02-11 07:41:59 · 1 answers · asked by allyn_03 2

also what does the atomic number of an element tell us

2007-02-11 07:28:54 · 9 answers · asked by ititit3 2

the mechanical energy lost by the ball as it bounces is approximately

2007-02-11 07:15:43 · 2 answers · asked by Anonymous

1remains the same
2 decreases
3 increases

2007-02-11 07:05:45 · 5 answers · asked by Anonymous

2007-02-11 06:40:09 · 7 answers · asked by maimatt7 3

I would like some help on:
how else two things work?.
what are they used for?
how did they come into being?
what are the advantages and disadvantages?
and any other details.
thanks in advance

2007-02-11 06:39:27 · 2 answers · asked by bex 2

Solid RbI has the so-called NaCl structure. The shortest distance between the centre of a rubidium cation and the centre of an iodide anion is 367.0 pm.

Calculate the length of the edge of the conventional face-centred cubic unit cell of RbI.

Calculate the density of solid RbI.

Calculate the shortest distance (centre to centre) between two iodide anions in solid RbI.

2007-02-11 06:10:18 · 1 answers · asked by kyro292 1

I wish to become a "full-fledged" Physicist. There are University Jobs available where u typically "teach", but I wish to become a Scientist like a one in NASA or Los Alamos. How differently do I need to prepare for this?

2007-02-11 06:00:29 · 2 answers · asked by Anonymous

weight is the force by which earth attracts a body towards its centre. so if a body is at centre, is its weight zero because its now not being attracted towards anything.

or is its weight maximum, because the value of 'g' is inversely realted to the distance from radius of the earth 'R'??

2007-02-11 05:59:33 · 6 answers · asked by last 1

Any variations in earth's magnetic field when these super magnets are operating and could effects be reversed if the magnetic field were reversed on these devices.

2007-02-11 05:51:09 · 2 answers · asked by loosewirz 1

A 12V, 40 A hr battery is connected to a 15 Watt lamp. How long will the battery last??

2007-02-11 05:49:11 · 6 answers · asked by dancer131 1

Mr.Heijmans refuses to pick up the tab for lunch unless everyone orders at the same time. Unfortunately, the two Amanda's lost track of time and now must run from Le Chateau. Amanda one runs at a speed of 2.5 m/s for 75 s, while Amanda two strolls second half at 3.5 m/s, how long does it take her to reach Mr. Greenjeans from Le Chateau?

2007-02-11 05:41:35 · 1 answers · asked by avant1991 3

hey guys...i'm stuck on a physics question...can someone explain how this would be done?

two pipes of equal length are each open at one end. each has a fundamental frequency of 480Hz at 300K. In one pipe, the air temperature is increased to 305K. If the two pipes are sounded together, what beat frequency results?

thanks

2007-02-11 05:40:37 · 3 answers · asked by Anonymous

How many potato batteries would be needed to power a circuit which requires 6V but a relatively small current?

random I know...

2007-02-11 05:39:56 · 3 answers · asked by dancer131 1

a car travels at constant speed aroudn a circular trach whose radius is 3.2 km the car goes once around the track in 360 s what is the magnitude of the centripetal acceleration of the car?


please help me set this up so i can solve thank you sooo mcuh

2007-02-11 05:25:00 · 3 answers · asked by Anonymous

Identify the force that maintains the circular motion of the following:

A bicyclist moving around a flat circular track
A bicycle moving around a flat circular track
A bobsled turning a corner on its track

I think the first two are centripetal force and the last one is gravitational force but i'm not sure.

2007-02-11 05:16:23 · 2 answers · asked by strawberrylollipop12345 1

I'm writing a silly Sci Fi short story about the development of various "simulated gravity" devices. It'll be a future-history type story (ala Heinlein), analysing as many devices as I can dream up beyond the centripetal force simulator, which is the most obvious and cheapest simulator to build.

2007-02-11 05:10:01 · 2 answers · asked by BigKnuckle 1

pls answer in detail....

2007-02-11 05:04:43 · 1 answers · asked by kashyap s 2

I have a problem here that has water at the top of a 50 m waterfall at 10 degrees celsius. The problem asks for the maximum temperature the water can be at the bottom. The answer is greater than 10 degrees, does anyone know how the heck this is possible?

2007-02-11 05:04:24 · 3 answers · asked by snoboarder2k6 3

A roller coaster moves through a vertical loop at a constant speed and suspends its passengers upside down. In what direction is the force that causes the coaster and its passengers to move in a circle? what provides this force?

yea i'm pretty lost so if someone could answer i'd appreciate it

2007-02-11 04:52:09 · 2 answers · asked by strawberrylollipop12345 1

What is the resistance of a 60 watt light bulb designed for 120 Volts?
*I used r= v/i but I just keep getting confused.

2007-02-11 04:50:35 · 6 answers · asked by dancer131 1

what is a good shock-absorber for a thermos?

2007-02-11 04:29:36 · 2 answers · asked by Anonymous

2007-02-11 04:22:10 · 13 answers · asked by sg 1

a) time is constant and unchanging
b) time speeds up near a massive object
c) that black holes can't exist
d) the eliptical orbits of plantes should shift in time
e) that speeds close to c can increase an objects mass

2007-02-11 04:19:58 · 4 answers · asked by Anonymous