Physics - May 2007

2007-05-28 16:08:02 · 2 answers · asked by mitlilkizbi 2

no i dont mean like bad karma or anything like that. i found an article in parade magazine that said they believe they have found something called 'dark energy' that makes up like 2/3 of the universe and that it is in a field of quantam physics. anyone heard of it or can provide more info?

2007-05-28 16:07:05 · 5 answers · asked by Kimi O 1

find the resultant of the following perpendicular forces: (a) 400N, 0degrees; (b) 820 N, 270degrees; (c) 500 N, 90degrees

COnvert: 6x10^4 mi/hr^2 to m/s^2

and 50m^3/s to ft^3/min

Thank you want to see if my asnwers are accurate

2007-05-28 15:56:52 · 1 answers · asked by mitlilkizbi 2

give two examples were objects are connected in series or parrallel and explain why theyre connected this way?

2007-05-28 15:11:36 · 4 answers · asked by Hamed S 1

2007-05-28 14:35:10 · 3 answers · asked by Anonymous

On a spacecraft, two engines are turned on for 684 seconds at a moment when the velocity of the craft has x and y components of vox=4370 m/s and voy=6280 m/s. While the engines are firing, the craft undergoes a displacement that has components of x=4.11x10^6 m and y=6.07x10^6 m. Find the x and y components of the craft's acceleration



ok so here are the knowns:


X direction data:
x=4.11x10^6 m
ax= need to know
vx=dont know
vox=4370 m/s
t=684 s

y direction data:
y=6.07x10^6m
ay=need to know
vy=dont know
voy=6280
t=684 s


how would i solve for acceleration? am i using one of the equations of kinematics for constant acceleration in two-dimensional motion or is this not considered constant acceleration? im really confused on where to go from here...

2007-05-28 14:33:19 · 3 answers · asked by Kel 1

7!...0! ....what the heck are they asking?

2007-05-28 14:27:13 · 4 answers · asked by Anonymous

a note played on a chello string is a superposition of many standing waves resonating on the string as the bow is slid across the string.

2007-05-28 14:21:07 · 3 answers · asked by nitrampf 1

magnets loose properties when they are heated up
what happens when it is frozen???

2007-05-28 14:17:37 · 3 answers · asked by newdsigner 1

A ferry boat is 4.0m wide and 6.0m long. When a truck pulls onto it, the boat sinks 4.00 cm in the water. What is the weight of the truck?

2007-05-28 14:15:54 · 2 answers · asked by lordhidetora 2

I've read that faster-than-light travel of an object (i.e. spaceship) in a finite amount of time would require infinite energy, or a finite amount of energy in an infinite amount of time. I don't understand how this makes sense. The speed of light, like the speed of sound, is a finite value. It then makes sense that accelerating to a finite speed would require a finite amount of energy. Reaching the speed of sound doesn't take infinite energy, so why would lightspeed?

2007-05-28 13:49:24 · 11 answers · asked by wolvorine555 1

if a 60W light bulb in a bedside lamp is only 20 percent efficient in converting electric energy into light energy, how much joules of light energy does the light bulb produce each time?

2007-05-28 12:39:46 · 4 answers · asked by jay gal 3

2007-05-28 12:29:30 · 3 answers · asked by kb 1

2007-05-28 12:28:11 · 6 answers · asked by kb 1

the wind is blowing from the south at 70KM/hr. Calculate the heading and air speed needed to reach the carrier 2.5 hrs after u take off

2007-05-28 11:33:21 · 2 answers · asked by SinghisKing794 2

colours. The rainbow colours appear when light passes through water droplets.

Statement B: Water droplets add colour to white light to produce the rainbow.

2007-05-28 11:24:18 · 4 answers · asked by Anonymous

Can someone explain E=MCsquared to me I know it is energy =the speed of light x the speed of light but what units are they using, grams, kilograms, pounds or tons, and is the speed of light in miles per second or kilometres and what if we used a different time scale? Perhaps one that had 30 seconds to the minute. I don't think i'm stupid but I cannot get my head around it.

2007-05-28 11:04:40 · 10 answers · asked by bo nidle 4

Hi,

Assume that a galaxy is 93000 ly in diameter. A spaceship crossing the galaxy measures the galaxy's diameter to be a mere 8 ly.

(a) What is the speed of the spaceship relative to the galaxy?
1.04999999994c
0.89999999994c
0.59999999994c
0.79999999994c
0.94999999994c
0.99999999994c

(b) How long is the crossing time as measured in the galaxy's reference frame (in years)?


I converted the light years into meters and then took a ratio of the two. Am I on the right track? It also seems like I should be using the equation delta t = delta x / v.


Thanks!

2007-05-28 10:15:22 · 2 answers · asked by Anonymous

How does the electric force between two charges change when the distance between them is doubled?

How does it change when the distance is halved?

2007-05-28 10:07:29 · 3 answers · asked by Anderson W 1

a ball is dropped from rest from the top of a cliff that is 24 m high. From ground level, a second ball is thrown straight upward at the same instant that the first ball is dropped. The initial speed of teh second ball is exactly the same as that with which the first ball eventually hits the ground. In the absence of air resistance, the motions of the balls are just the reverse of each other. Determine how far below the top of the cliff the balls cross paths.

2007-05-28 09:58:43 · 3 answers · asked by wildcherrychica1 2

why will the resistance of a wire be slightly different immediately after you have held it in your hand?

2007-05-28 09:11:52 · 5 answers · asked by Anonymous

i understand how the tidal effect works, but does this work on all water or just large bodies? like does it effect the water in my body.

2007-05-28 09:06:40 · 14 answers · asked by Anonymous

ok so there i was lying in bed 1 o clock in the morning i coulsnt fall i asllep, so im there staring at ,my clock, i blink and bam the clock says 5 oclock!!!! and u no wut i was in the sam postion, so i did not fall asleep i would have remembered a dream and i woud not have beeen in the exact sam postion when it said 5 o clock cause i move around a lot when i sleep. Cases exactly like this have been reported in the bermuda triangle and the devils sea ( dragons triangle). oh yhea and my clock did not just go badf every other clock in my house was thre same timeand after like 3 hours skool started so my clocks did not get messed up. Has any one elses ever lost time like this, this has happened to me like 2-3 times! i lost 4 hours!

2007-05-28 08:43:29 · 14 answers · asked by Anonymous

I was recently on my site, startrekwiki.wetpaint.com, and this question came up. I know a fair bit about the fictional Transporter, and the real attempts at it.
But, I have to throw this out there: Why, or why not? What would it take to grab some particles, stretch them into a line, then shoot them across a short distance. Of course, then there's always the problem with life being transported, but that's another issue.

2007-05-28 08:37:39 · 3 answers · asked by Webmaster_2.0 2

Can you explain the concept of elastic collision, and the relationship of temperature and the kinetic energy of a substance? Please help!!! i need to understand this for my science final, and i just dont get it

2007-05-28 08:31:29 · 2 answers · asked by That NorCal Girl. 2

2007-05-28 08:12:38 · 3 answers · asked by Ola S 1

why doesn't it absorb as well as black.. Why does it keep you cooler in summer?

2007-05-28 08:12:06 · 11 answers · asked by Anonymous

The bullet leaves the gun parallel to the ground and puts a hole in a window of another building and hits the wall that faces the windo. Using the data in the drawing, determine the distances D and H which locate the point where the gun was fired. Assume that the bullet does not slow down as it passes through the window.

2007-05-28 08:05:39 · 1 answers · asked by wildcherrychica1 2

...does this refer to the amount of potential energy released over a particular span of time, or in one instant? Is there a further formula to show how the amount of energy released increases or decreases over time, from the initial release of that energy?

2007-05-28 07:54:48 · 5 answers · asked by Voight-Kampff 3

How can Rolex and Omega be condsidered chronometers?
My Seiko Kinetic gains only one second every other day.
My Rolex and an Omega and both lose betweem 2-3 seconds a day. I was curious and tested them. Makes me sick!

2007-05-28 07:48:33 · 8 answers · asked by windsurfingfun 2