Physics - May 2007

help I am lost :(

2007-05-21 08:39:16 · 4 answers · asked by Eric 1

help please I am lost :(

2007-05-21 08:31:08 · 4 answers · asked by Anonymous

A hockey puck is set in motion across a frozen pond. if ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is?

2007-05-21 08:03:08 · 8 answers · asked by Anonymous

How can i create a simple emergency lamp using one 12vdc CFL which switches it self on during Blackouts (using light detectors) ANd i Want a over charge and deep discharge protection for my 12V lead acid battery also specify the ballast circuit or atleast its sourse (i.e, from where can i get it)

2007-05-21 07:51:19 · 2 answers · asked by Anonymous

this thought occured to me at work today because i have to hit the sised of metal boxes together then i started thinking of ther angle of the hand swing compared to the hammer head swing

i hope you know what i mean

thank you


xxx

2007-05-21 07:44:46 · 15 answers · asked by vici 4

a piece of rope is pulled by two people in a tug- of- war. each person pulls with 400N of force.

2007-05-21 07:38:52 · 3 answers · asked by Anonymous

The old argument that nuclear power presents more problems with waste storage is not valid if we follow methods of some of other countries which are reusing the nuclear waste and/or using pellets rather than rods.

2007-05-21 07:37:49 · 4 answers · asked by stockhamdd 1

A constant resistive force starts acting on body of mass 10 kg moving with speed of 10m/s.If 5 sec after the force starts acting on the body its speed is 8m/s.After how much time,fromthis instant,will body comes to rest

"give calculation process"

2007-05-21 07:32:57 · 3 answers · asked by Ram Latit P 1

I don't really get what it is, so can someone explain it in simple terms please? also, do quantum particles actually exist, because loads of people seem to refer to some of it as theory...

thanks.

2007-05-21 07:32:10 · 4 answers · asked by Kit Fang 7

the radius of the feris wheel is 12.2 m and the diameter of the axle is 12

2007-05-21 07:24:46 · 1 answers · asked by stompchica131 1

When two resistances are conn. in parallel then the equivalen resistance is6\5 .When one of the resistance is removed then the effective resistance is 2.The resistance of the wire removed will be
1. 3
2. 2
3. 3\5
4. 6\5

2007-05-21 07:18:09 · 2 answers · asked by godisgreat 1

Two batteries os e.m.f.'s E1 and E2 and internal resistances r1 and r2 are connected in parallel.Their equivalent e.m.f. will be
1. E1r1+E2r2\E1+E2
2. E1r2+E2r1\r1+r2
3. r1+r2\E1r1+E2r2
4. r1+r2\E1r2+E2r1

2007-05-21 07:11:41 · 1 answers · asked by godisgreat 1

How much net work (in joules) is done in accelerating a 1000 kg rocket sled on horizontal frictionless rails from 20 m/s to 40 m/s. Thank you.

2007-05-21 07:07:48 · 3 answers · asked by Anonymous

2007-05-21 07:07:19 · 4 answers · asked by Marilyn M 1

Solid uniform cylinder rolls down the plane inclined
45 degrees to the horizon. Coefficient of friction
between the cylinder and the plane is μ.

What value of friction μ results in greatest possible
loss of energy due to friction?

2007-05-21 07:06:12 · 1 answers · asked by Alexander 6

At the bottom of one loop a roller coaster carriage (mass 1500 kg) has a kinetic energy of 4.32 x 10^5 J. If the loop has a diameter of 27 m, can it make it to the top of the circular loop ( assuming no friction loss)?

2007-05-21 07:05:26 · 4 answers · asked by Anonymous

2007-05-21 06:46:53 · 6 answers · asked by Andrew C 2

Car A has a mass of 1000kg and a speed of 60 km/h, and car B has a mass of 2000 kg and a speed of 15 km/h. The kinetic energy of Car a is:
a) half that of car B
b) equal to that of car B
c) eight times that of car B
d) four times that of car B

2007-05-21 06:39:17 · 8 answers · asked by Anonymous

So why doesn't time exist. well simply because you can take anything in the world break it down into atoms and it never ages. Only its whole ages/deteriorates back into atoms and other elements.Which also leads to a theory of creation.I believe that the universe is made up of so many atoms like the earth has soo much water on it. Back before the universe was created you had atoms which made up the fabric of reality. Don't ask where the atoms came from, because they were always there, this is because they can neither be created or destroyed, it is the fabric of this dimension/universe/gaping hole.Whatever you want to call it. These atoms where in singular form floating in darkness. As timegoes on the atoms attract towards one another and form elements and or things, eventually forming all things you see today.Keep in mind that an explosion big enough is probably capable of splitting all atoms apart from eachother in the future thus, somewhat explaining the expanding universe..

2007-05-21 06:08:29 · 12 answers · asked by Anonymous

2007-05-21 04:20:22 · 9 answers · asked by Anonymous

2007-05-21 02:50:38 · 6 answers · asked by drake e 1

am writing my project on salt water battery and i want to know may be it has an advantages over all other types of battery and probably its disadvantages

2007-05-21 02:13:21 · 3 answers · asked by bode p 1

2007-05-21 01:14:48 · 5 answers · asked by Anonymous

2007-05-21 00:20:55 · 7 answers · asked by ryburnsjr 1

Feathers are dropped from a height of 100 metres on the Earth, Mars and Venus.
The surface gravity on the Earth, Venus and Mars are 978, 860 and 378 cm/sec2
respectively. The surface atmospheric pressure on Venus and Mars are 90 times
and 0.01 times that of the Earth respectively. In which order will the feathers
settle on the respective surfaces?
A] Mars – Earth – Venus B] Earth - Venus – Mars
C] Venus – Earth – Mars D] Venus – Mars – Earth

2007-05-21 00:06:34 · 7 answers · asked by suseendar 1

Which principle does not apply when hydrogen balloon goes up in the air?

A] Archimedes Principle B] Principle of Buoyancy
C] Newton's third law D] Law of gravitation

2007-05-20 23:58:20 · 8 answers · asked by suseendar 1

2007-05-20 22:15:36 · 3 answers · asked by truthseeker 1

OK...i have glass as my upper roller 2 pins as the brushes PVC belt and a 6 v motor...its shaft as the lower roller to gain charge.....but its not working good....on the advice of a gentleman around here i used a sphere(2 inverted steel bowls brought together by tape) and connected to the lower roller....its gaining a maximum charge of .11V that too in the beginning.....instead of the charge increasing its *DECREASING*....and i'm really frustrated bout this.....it lowers to .06 volts....thats it....got any advice whats goin on??

2007-05-20 21:35:47 · 2 answers · asked by Anonymous

If a ball weighing 2.2kg is released from rest and drops 93mm onto a mass(5.7kg) which is at rest and is supported by a spring.

If the coefficient of restitution for impact is 0.93, what is the maximum deflection downwards of the mass.??

oh and spring constant is 654N/m,
(remember, the spring will initially be compressed, due to the force from the weight of the block.!!)

2007-05-20 20:41:18 · 1 answers · asked by ivan a 1

Why are we having change in climate,is it a pole shift?,The sun getting bigger,hotter?Solar storms?Man- made global warming?Or, all of the above?What if they are all happening?

2007-05-20 20:40:12 · 8 answers · asked by Life goes on... 6