Physics - January 2007

Can anyone describe to me how to do projectile motion?

I have some problems that I need help with:

1. A fire hose ejects a stream of water at 35° above the horizontal. the water leaves the nozzle with a speed of 25 m/s. Assuming that the water behaves like a projectile, how far from the building should the fire hose be located to hit the highest possible fire?

2. A horizontal rifle is fired at a bullseye. The muzzle speed of the bullet is 670 m/s. The barrel is pointed at the center of the bull's-eye, but the bullet strikes the target .025 m below the center. What is the horizontal distance between the end of the rifle and the bull's-eye?

3. An Olympic long jumper leaves the ground at an angle of 23° and travels through the air for a horizontal distance of 8.7 m before landing. What is the takeoff speed of the jumper?


I would really appreciate your help I have a test on this tomorrow! :(

2007-01-02 06:49:44 · 5 answers · asked by Lindsey 2

2007-01-02 06:48:14 · 4 answers · asked by Anonymous

the initial velocity of a 4.0 kg box is 11m/sec due west. after the box slides 4.0m horizontally, its speed is 1.5 m/sec. determine the magnitude and the direction of the non-conservative force acting on the box as it slides.

2007-01-02 06:46:06 · 3 answers · asked by timn 2

2007-01-02 06:46:03 · 20 answers · asked by lotto2012 1

2007-01-02 06:39:10 · 2 answers · asked by carl_conti08 1

Is anyone at all skeptical of Einstein's Theory of Relativity? When I mean anyone, I mean any great mathematicians, or even you guys in Yahoo! Answers.

2007-01-02 06:25:31 · 9 answers · asked by cve5190 4

2007-01-02 05:30:17 · 7 answers · asked by MEGHA 1

iam a 10 class studen trying to understan Xii pohysic can any nated professor of physic explai me kirchoffs law

2007-01-02 05:07:06 · 4 answers · asked by Navendu G 1

in other words, is time totally unreal or does it apply to everything constant, even fractions and nano applications?

2007-01-02 03:57:57 · 7 answers · asked by romaniascott 4

in other words, is time totally unreal or does it apply to everything constant, even fractions and nano applications?

2007-01-02 03:56:53 · 3 answers · asked by romaniascott 4

from the desk of www.brokenbrain-kuramannil.blogspot.com

2007-01-02 03:51:38 · 2 answers · asked by Varghese K 1

I know that shorter wavelength = higher frequency. But when people just say oh, the shorter wavelength allows for the data pits/bumps to be packed in tighter. Why? If anything, I'd think amplitude would matter more. Or am I just visualizing a wave of light in the wrong way? Can someone clear this up for me?

2007-01-02 03:48:36 · 5 answers · asked by TeknoZX 1

explain why certain objects feel cold and others feel warm

2007-01-02 03:39:26 · 5 answers · asked by ? 1

The principle involved and the instrument used are needed

2007-01-02 03:31:26 · 3 answers · asked by mahesh 1

Do sound waves require air to travel?

2007-01-02 03:23:22 · 7 answers · asked by matt c a 1

There would be no air resistance or wind to slow it down.

2007-01-02 02:55:26 · 10 answers · asked by Anonymous

what is a butterfly effect?coz i have a hard time reading it in the web. i mean can somebody explain to me in simple words..i've watched the movie butterly effect and im just curious...

2007-01-02 02:45:15 · 8 answers · asked by kaks 1

i am facing problem in understanding, how a stationery is reflecting back even it is having a choice to propagate in the forward direction, to form a stationery wave.

2007-01-02 02:42:25 · 2 answers · asked by vinnu 1

Please keep in mind a distinction between the use of the term 'complexity' in ordinary conversation (William Falkner's novels are complex) verses complexity in the mathematical sense (the capacity to give rise to virtually unlimited and unpredictable higher-order patterns - often associated with chaos and self-organizing systems aka non-linear dynamic systems, etc.) I am wondering if an individual string in string theory can be considered complex in the mathematical sense, or would complexity arise only from the interactions of a bunch of strings? Logical argument for or against would be appreciated, as well as links/references to where I might find discussions of this topic.

2007-01-02 02:40:27 · 6 answers · asked by eroticohio 5

My belief is that they are on and the same, other than that, there is only 1

2007-01-02 02:39:38 · 9 answers · asked by Anonymous

2007-01-02 02:37:15 · 3 answers · asked by ZeberCet 2

2007-01-02 02:36:13 · 10 answers · asked by Anonymous

As I know the unit of stopping power ( dE/dx) is [Mev/cm], but the unit of power is [J/s] ... How come???
I want to know if it is correct to say stopping power or stopping force??

2007-01-02 02:35:42 · 1 answers · asked by gold_sunlight.2007 1

2007-01-02 02:29:44 · 8 answers · asked by einstein 1

2007-01-02 02:29:07 · 9 answers · asked by Anonymous

And if it does, are you willing to believe it?

2007-01-02 02:25:04 · 10 answers · asked by Anonymous

I know what is inside, I have known for at least 15 years and I am sitting by watching scientists prove me right....they are all going toward the inevitable but can not bring themselves to see it....


Whats your guess?

2007-01-02 02:22:36 · 9 answers · asked by Anonymous

it's easy.

2007-01-02 02:07:38 · 10 answers · asked by Anonymous

2007-01-02 02:03:54 · 8 answers · asked by ? 6

we know that people's skin loses its tightness b/c of gravity

2007-01-02 01:49:57 · 4 answers · asked by Anonymous