Physics - February 2007

it is under the topic of WAVE SPEED.

thunder and lightening occur at the same time,lightening strikes 1Km away. If you see the flash immediately, how long do you have to wait before you hear the thunder? ( take the speed of sound as 333m/s).

i will be grateful if you show the working (expanations) if you can.
thanks

2007-02-20 07:08:00 · 3 answers · asked by b-ball rooky 2

according to newton's1st law!
a body tries to be in motion untill and unless some external force is applied on it!
and a body tries to be in rest position until and unless any external force is applied!!!!!!!!!

so my question is,
suppose there is a hollow cube placed on a frictionless surface and a man is standing inside it.can that man move that cube?if he can, then isnt the law of INERTIA wrong?

note:
1)inside the cube there is sufficient friction so that man can move.
2)man do not have any tools with him.

2007-02-20 07:06:16 · 10 answers · asked by NILAY MITASH 1

where does the mass come from ? does that mean that when I walk, i am actually getting more massive?

2007-02-20 07:04:14 · 4 answers · asked by Michael n 2

2007-02-20 07:01:37 · 1 answers · asked by mesun1408 6

2007-02-20 06:43:25 · 2 answers · asked by keerthika 1

2007-02-20 06:41:40 · 4 answers · asked by tantodavia 1

Given that its a relative concept.

2007-02-20 06:34:39 · 10 answers · asked by Antares 6

2007-02-20 06:26:30 · 7 answers · asked by Anonymous

2007-02-20 06:26:03 · 5 answers · asked by Anonymous

2007-02-20 06:24:58 · 1 answers · asked by Anonymous

what should the mass of my weights be and what size newton meter (measures force) should i use. The planning i am doing is to create a bridge like structure. Please help!! Thanks

2007-02-20 06:13:29 · 1 answers · asked by Ryujin 3

Hey! Please any help on this problem! I am really stuck on this one. Any help would be great.

A 0.250-kg block is placed on a light vertical spring (k = 5.00 x 10^3 N/m) and pushed downwards, compresing the spring 0.100 m.

After the block is released, it leaves the spring and continues to travel upwards. What height above the point of release will the block reach if air resistance is negligible?

2007-02-20 05:49:54 · 2 answers · asked by Anonymous

plesae will you tell me in the sipelest way! Thanks xx

2007-02-20 05:44:17 · 6 answers · asked by gem--b 1

2007-02-20 05:36:39 · 7 answers · asked by Anonymous

I have a very hard time accepting the concep that anything can exist and be massless. Is energy not simply an aspect of something with mass?

This seems like the kind of thing I hear about black holes having infinate density or being infinately small. Very Very dense and very very small smell far more likely. Just because it is beyond our ability to meaningfuly measure doesn't make it infinate.

How does something exist if it isn't there?

2007-02-20 05:21:10 · 4 answers · asked by Anonymous

Ok, a guy I knew a long time ago told me this one, but said he forgot the answer his physics teach came up with:

You are holding a flashlight (a theoretically perfectly straight and coherent laser), and pointing it at a nebula that is, oh, let's say, 5 light years away. This assumes, of course, you can hold it there for 5 years, but bear with me. The nebula is 3 light years across to your point of view (left to right).

The beam is shining on the leftmost side. You move your wrist, and now the beam is pointing at the rightmost side, 3 light years away from where it just was. 5 years later, the end of the beam catches up with your movement, and now shines on the right side, 3 light years from where it started.

The termination of the beam moved instantly across the nebula, exceeding the speed of light. Is that what would happen? What is wrong with this picture? (the actual physics, not the absence of our theoretical laser). Thanks!

2007-02-20 05:08:58 · 7 answers · asked by f_ramsey 1

A box is moved from the floor to a tabletop but gains no speed in the process. Is there work done on the box, and if so what has happened to the energy added to the system?

2007-02-20 05:01:41 · 2 answers · asked by damon h 1

just a crazy thought

2007-02-20 04:57:21 · 6 answers · asked by aka_sickfix1978 1

Which requires more work, lifting a 6 kg rock to a height of 9 m without accelerating, or accelerating the same rock horizontally from rest to a speed of 15m/s? Work to lift the rock? Work to accelerate rock?

2007-02-20 04:52:58 · 3 answers · asked by damon h 1

THERMO-DYNAMICS:

The properties of vibrations acting on matter.


The 2003 report:
Plus amendments 1-9 @2005


The following were developed by:

JE Bressman copyright @ 1994/@2003

4. U238 is the threshold of radioactivity
in kilo/cm3 or kilo/m/sec.

5. Electronic events can be demonstrated mechanically
enthalpy and entropy occur in both mechanical and
energetic systems.

6. As vibrations approach object mass, spontaneous
emissions and self-destruction's occur.
kilo/cm3/(sec) x % nuclear

7. Matter is an efficient wave guide.

8. Divided objects have more surface and relativity
in fact divided objects always reduce voltage and
increase amps.
The wave guide is 25% larger (1 object = ((x,y,)x 6)
/2 = ((x,y,)x8)=25%)
OR 2/2= (1)+(1) = 25% more surface (+(x,y,)(x,y,))

9. All surfaces reflect and absorb energy in
percentages as if they were a dot matrix.
(% of reflected light)/cm2 typ

10. All fields are 3 dimensional surfaces and peculate
according to gravitational effect.
in psi/moment

11. Most events are locomotion's some are Omni-
directional others are Uni �directional.

12. The weak force is the effect of space doing work
in vacuums.
liters 3

13. Gravitation is the effect of matter doing work
as a structure.
psi /moment or (lb ft cubed sec)vacuum

14. Electromagnetism it a vibrating surface effecting
space/matter by doing work as an energetic vibration.
ft lbs/sec

15. The strong force is the effect of squeezing matter
into to smaller and smaller spaces and the work that
is done by this effect.
in watts/cm3

16. Quantum topography describes a single object,
absorbing vibrations, acting as many single objects.
(lbs/ft3 + lbs/ft/sec)=(x)x(x)/ft/sec
Object weight plus energetic manipulation = additional ft lbs/sec.

17. Vibrations, explosions and movement cause gravity
holes. "Echoes of displaced matter/space."
(Auto combustion's cause gravity holes and thin the
atmosphere.) Displaced space/matter.
In vacuums/liter 3/sec (x% of actual event)

18. Hot gases are hydrogen.(in theory)

19. Liquids are gravity hole models.(in theory)

20. All things are as they are and never more.
(Or less)

21. The math is always:
Properties of (hydrogen x atoms) in group
or (weight of sub atomic particle/hydrogen

2007-02-20 04:50:35 · 1 answers · asked by atomic49er 3

I've got this question on forces and i dont know how to answer it. so if you know, please help!

A particle of mass 8000g is at rest in limiting equilibrium on a rough inclined plane, inclined at 40 degrees. Find the frictional force on the particle and the normal reaction and hence the coefficient of friction.

Im grateful for any help
thanks

2007-02-20 04:48:41 · 6 answers · asked by galaxy_callen 4

A golf putter (for the sake of the question) is moving at X velocity and strikes a stationary golf ball....what will the velocity be of the golf ball after the collision.

Putter mass: .133 kg
Putter velocity: 1.25 m/s
Angle of the face of the putter: 3 degrees
Golf ball mass: .0047 kg

I think this is a conservation of momentum problem, but does anyone know how to incorporate the 3 degree angle of the putter face too?

Thanks....best answer will be the one that shows the most work.

2007-02-20 04:46:47 · 3 answers · asked by travo 1

I have been curios on what it is. Can someone please tell me what it is and what kind of math is required (or needed) to do and understand Quantum Physics.

2007-02-20 04:36:25 · 7 answers · asked by T-Bob Squarepants 3

A statellite M = 1000kg has circular orbit and its initial speed is 5000m/s.

Pressurized hydrogen gas escapes from the tank through the crack directly bacwards with the speed 1000m/s at a rate 10mg/s.

What is the new speed of the satellite after 5kg of gas has escaped?

2007-02-20 04:31:54 · 1 answers · asked by Alexander 6

2007-02-20 04:21:30 · 66 answers · asked by IshotJR 2

I am wanting the music to be just as easy to feel.Just as audible.

2007-02-20 04:17:15 · 1 answers · asked by Anonymous

2007-02-20 04:06:35 · 8 answers · asked by mohit 1

If a truck (mass=1750kg) is pulling a trailer (mass=250kg) and the combination is accelerating at 3 meters per second, what is the tension between the truck and trailer? (Rolling friction is assumed to be zero and the road is level.)

2007-02-20 03:55:53 · 1 answers · asked by GSU 1

If a 10kg mass is dropped from a height of 2 meters (free fall for this distance) and then rapidly decelerates to a stop in just 1cm distance. What is the average deceleration force on the mass?

2007-02-20 03:55:18 · 2 answers · asked by GSU 1

What is the magnitude of the gravitational force between the Earth and the Moon? Use the constants in the book’s front inside cover.

2007-02-20 03:54:41 · 2 answers · asked by GSU 1