Physics - September 2006

A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 2.50 m/s2 until its engines stop at an altitude of 170 m.

(a) What is the maximum height reached by the rocket?
___ m
(b) How long after lift-off does the rocket reach its maximum height?
___ s
(c) How long is the rocket in the air?
___ s

2006-09-22 12:28:13 · 9 answers · asked by Anonymous

If man created a new universe with all the same laws as the current one but consisting of only a thousand particles/limited amount of energy, could it THEORETICALLY be possible to predict the course and behaviour of every particle in that universe?

This universe would exist as an entirely seperate entity; there would be no external input or output into it. The energy and particles would also be injected into this universe by man so that man knew the position, energy and direction (every aspect that would determine the course) of everything inside the universe.

ALSO we would assume that man, in this situation, would be at the very upper limits of possible technological and scientific ability to the point where he has conquered the subatomic measurement problems that the Heisenberg uncertainty principle and observer effect present.

Detailed answers from people with a physics background would be especially be welcomed as this is part of a deeper, complex idea I am exploring.

2006-09-22 12:22:06 · 6 answers · asked by Anonymous

Tom the cat is chasing Jerry the mouse across the surface of a table 1.0 m above the floor. Jerry steps out of the way at the last second, and Tom slides off the edge of the table at a speed of 4.8 m/s.

Where will Tom strike the floor?
(I calculated this and got 2.16 m from the table)

What velocity components will he have just before he hits? (Use a coordinate system in which up is positive.)
(I calculated this and got 4.77 m/s in the x direction)

___ y direction m/s (for some reason, I can't figure this one out)

2006-09-22 12:00:47 · 6 answers · asked by Anonymous

2006-09-22 10:16:45 · 1 answers · asked by Anonymous

2006-09-22 10:12:58 · 27 answers · asked by Anonymous

2006-09-22 09:55:36 · 1 answers · asked by Anonymous

a chemistry student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 11 m/s. The student throws a ball into the air on a trajectory that she observes to make an initial angle of 54degree with respect to the horizontal along the same line as the track. The a physics student, who is standing on an embankment nearby, observes the ball to rise straight up vertically.

How high does the ball rise? (What is the horizontal component of the velocity of the ball as measured by the student?)

2006-09-22 09:13:17 · 9 answers · asked by hardik p 1

Two train stations 300 km apart.

Train 1 leaves station A and travels at a constant speed of 50 km/h towards station B.

Train 2 leaves station B and travels at a constant speed of 75 km/h towards station A.

A small fly takes flight from the front of train 1 and flies toward train 2 - always moving 5km/h faster than the train. When it reaches train 2, it turns around and flies back towards train 1, again moveing 5km/h faster than the train.

Where will the fly be when the 2 trains meet?

2006-09-22 09:04:04 · 8 answers · asked by p_rutherford2003 5

An accelerometer (a device to measure acceleration) can be as simple as a small pendulum. Suppose you are flying a small plane in a straight horizontal line and your accelerometer hangs 10 behind the vertical. What is your acceleration? (Use the numbers given in the question)

2006-09-22 08:56:09 · 5 answers · asked by Anonymous

A helicopter is flying horizontally at 7.6 m/s and an altitude of 16 m when a package of emergency medical supplies is ejected horizontally backward with a speed of 14 m/s relative to the helicopter. Ignoring air resistance, what is the horizontal distance between the package and the helicopter when the package hits the ground?

2006-09-22 08:54:44 · 1 answers · asked by Anonymous

What is the instantaneous velocity v of the particle at t=10.0 m s?
v_av =0.600 m/s and Deltax =30 m

2006-09-22 08:43:36 · 2 answers · asked by Theresa C 2

With all this nuclear talk in the mid east I was thinking about the waste. The question that came to my mind is "What waste?". I have just finished reading Wikipeida on this and still do not have a clear understanding.

If this "waste" is so radio active, why then aren't we using it to generate electricty? Might need a different reactor than the first, but that would be ok.

So wuz up with this? Burying it or turning it into tank ammo does not make sense to me. Isn't there any type of reactor that can take this waste and generate electricty?

TIA

2006-09-22 07:37:10 · 6 answers · asked by fwiiw 4

2006-09-22 06:42:36 · 6 answers · asked by swasteppers2005 1

If we understood and took account of everything in the universe that would affect particles (including everything we don't understand or havn't even discovered yet) and were able to measure and implement these factors into every experiment that would be affected by the Heisenberg Uncertainty Principle, would these uncertainties cease to exist?

I know there isn't a definite answer, but any opinions from people who know about physics would be greatly apprectated.

2006-09-22 06:21:43 · 12 answers · asked by Anonymous

...where do our thoughts and memories go when we die?

2006-09-22 06:13:07 · 11 answers · asked by Marcello 2

a) to travel faster
b) to travel in a straighter line
c) to slow down quicker when they hit the ground
d) so they always land in the rough

2006-09-22 05:51:07 · 22 answers · asked by dB 4

If man created a new universe with all the same laws as the current one but consisting of only a thousand particles/limited amount of energy, could it theoretically be possible to predict the course and behaviour of every particle in that universe?

This universe would exist as an entirely seperate entity; there would be no external input or output into it. The energy and particles would also be injected into this universe by man so that man knew the position, energy and direction (every aspect that would determine the course) of everything inside the universe.

Also we would assume that man, in this situation, would be at the very upper limits of possible technological.scientific ability.

Detailed answers from people with a physics background would be especially be welcomed as this is part of a deeper, complex idea I am exploring.

2006-09-22 05:49:54 · 6 answers · asked by Anonymous

If the energy that is expened in shaking water in a closed bottle is turned into heat,, could we boil water by shaking it fast enough?

2006-09-22 05:40:57 · 6 answers · asked by Anonymous

This is for a neat idea I have...
Dont say anything to any companies, but I think I've discovered a self-working power generator.

2006-09-22 05:27:32 · 7 answers · asked by lewa 2

The peregrine falcon is the fastest bird, flying at a speed of 200 mi/h. Nature has adapted the bird to reach such a speed by placing baffles in its nose to prevent air from rushing in and slowing it down. Also, the bird's eyes adjust their focus faster than the eyes of any other creature, so the falcon can focus quickly on its prey. Assume that a peregrine falcon is moving horizontally at its top speed at a height of 100 m above the ground when it brings its wings into its sides and begins to drop in free fall. How far will the bird fall vertically while traveling horizontally a distance of 104 m?

2006-09-22 05:25:15 · 6 answers · asked by activegirl 1

2006-09-22 05:20:52 · 5 answers · asked by Anonymous

2006-09-22 05:07:48 · 5 answers · asked by mlove5350 1

Does the frequency of a pure tone being played through a stereo have any effect on the lifetime of the stereos battery?

ie would a tone of frequency ~ 50 Hz use less power/energy from the stereos battery therefore play longer than a frequency of ~10000Hz?

2006-09-22 04:33:33 · 5 answers · asked by benabean87 2

Question 1: Choose the best statement about electromagnetic waves:
*They include xrays, light, and microwaves
*They travel at the speed of light
*They are produced by accelerating electrons
*They are moving electric and magnetic fields
*All of the above


Question 2: What is true about the "tuner" in a radio receiver?
*It allows you to tune the volume of the signal
*It resonates at one particular frequency
*It is usually made from a diode
*It is part of the demodulator
*It delivers a reference "pitch" to the radio

My answers:
Question 1: all of the above
Question 2: *It delivers a reference "pitch" to the radio

please let me know if i am right thanks, i cant afford to get any more questions wrong so i just want to triple check everything

2006-09-22 04:31:28 · 9 answers · asked by Anonymous

2006-09-22 04:26:00 · 7 answers · asked by Sundar e 2

2006-09-22 03:57:36 · 20 answers · asked by Anonymous

Normal optical filter blocks some range of light frequency. Filter characteristics is static and never changes.

What I'm looking for is a filter with variable characteristics which is sensitive to mechanical force exerted on it. For example, if a filter is stretched outward, its filtering range moves as the strech continues.

Am I dreaming? Looking at the eye glasses that is darkened when you are outside and gets light when inside, hopefully I'm not.

2006-09-22 03:36:24 · 2 answers · asked by mysimpia 1

a ball of mass m1 strikes another ball of mass m2 at rest with velocity 'u'. the first ball comes to rest and the second ball moves away with some velocity "v". the kinetic energy lost is half the initial kinetic energy of the first ball (the collission is not elastic)

2006-09-22 03:20:43 · 3 answers · asked by ratface 1

2006-09-22 03:12:58 · 8 answers · asked by Anonymous

Is it accelerating when we throw it up? Is the acceleration constant no matter how high we throw the ball up? If an astronaout throws a ball in the space shuttle, is the ball acceleration?

2006-09-22 02:56:38 · 9 answers · asked by Jojomon 2