Physics - September 2007

a 1300Kg car moves along a horizontal road at speed v0=25.2m/s . the road is wet so the static friction coefficient between tires and the road is only Us= .379 and the kinetic friction coefficient is even is even lower, Uk= .2653. Assume acceleration of gravity is 9.8m/s^2.

2007-09-30 05:55:38 · 1 answers · asked by Anonymous

Be objective plz

2007-09-30 05:19:00 · 4 answers · asked by Anonymous

I'm really dumb for not getting this one but I'm really exhausted after 60 problems. So a guy tosses a basket ball into a hoop that is 3.048 m high at an angle of 47 degrees and a velocity of 17 m/s. The man's height is 2.554 m. How long does it take the ball to achieve its maximum height (the half g a^2 formula is not working for me). How long for it to reach the hoop and the horizontal length of the shot. I've been up all night so please help me.

2007-09-30 05:13:25 · 1 answers · asked by Crashovdr 4

track* is a wall that slopes upward at a 12 degress angle with the horizontal. As you face the window (o.9m high, 2.0m wide) in your compartment, the train is moving to the left, as the rawing indicates. The top edge of the wall appears at window corner. The top edge of the wall first appears at a window corner A and eventually disappears at window corner B. How much time passes betwen appearance and disapppearance of the upper edge of the wall?

2007-09-30 05:08:05 · 1 answers · asked by Anonymous

please explain?

2007-09-30 05:06:09 · 6 answers · asked by Anonymous

A pumped-storage reservoir sits 155 m above its generating station and holds 8.5 *10^9 kg of water. The power plant generates 320 MW of electric power while draining the reservoir over an 8.5 hour period. What fraction of the initial potential energy is lost to nonconservative forces (i.e., does not emerge as electricity)?

2007-09-30 05:04:39 · 2 answers · asked by dsgdh 2

speed of 5.0m/s relative to the ground. When the train moves at a constant velocity, the raindrops make an angle of 25 degress when they move past the window, as the drawing shows. How fast is the train moving?

2007-09-30 05:02:03 · 1 answers · asked by Anonymous

Consider a droplet with radius R and charge Q, and it breaks into two droplets with charges Q/2 and radius R'. They repel each other to a distance much greater than R'. What is the loss of electrostatic energy.

This problem really confuses me. My best understanding is the work to make the configuration of the smaller droplets is the engery loss. Yet, the seperation goes from zero to some distance d where d >> R'. I was just thinking what if a calculated the work it took to take one of these particles from infinity to a distance d from the other charge...

Is that the same amounto of energy?

2007-09-30 04:48:37 · 2 answers · asked by Anonymous

Im interested in this feild and looking for answers for why we exist. Id like to know more about it. do you know where i can get information on this.

2007-09-30 04:26:57 · 3 answers · asked by Joann 3

A foul ball is hit straight up into the air with a speed of about 18 m/s.
(a) How high does it go?
(b) How long is it in the air?

2007-09-30 04:11:43 · 1 answers · asked by hahahahahaha 1

Those are Relativity, Quantum Mechanics, String Theory, Loop Quantum Gravity....Can someone please delve a little deeper in the last two given that I understand mostly anything about them.....and in String Theory how is it that it is able to merge Relativity and Quantum Mechanics if they are almost opposite in some aspects.

2007-09-30 04:06:52 · 2 answers · asked by feelingtherain 2

A 4.15 kg rabbit is on top of a 5.23 kg box. A horizontal force of at least 12.1 N must be applied to the rabbit to cause him to slip on the box (which is held stationary). If the rabbit-box system is placed on a frictionless floor, what is the maximum horizontal force that can be applied to the box so that the rabbit and box move together (ie. the rabbit doesn't slip). Any help would be appreciated. Thanks

2007-09-30 03:54:02 · 1 answers · asked by Fredrick J 2

plZ,explain with mathematical form.also give suitable example

2007-09-30 03:28:32 · 3 answers · asked by Abhishek 1

A 1500 kg car is moving with a speed of 25 m/s. How much work is required to stop the car?

Thanks

2007-09-30 03:26:02 · 2 answers · asked by Anonymous

Put as basic as possible without any form of maths, what would the answer be, apart from them having different names.

2007-09-30 02:15:11 · 2 answers · asked by Michelino 4

2007-09-30 00:05:18 · 4 answers · asked by Anonymous

2007-09-30 00:02:30 · 6 answers · asked by murali krishna 1

How can a prism be used to disperse white light?

2007-09-29 23:48:21 · 5 answers · asked by Anonymous

1. First question, What relationship exist between Voltage and Current? Is it a hyperbola, a straight slope, etc.. or what? Also what is the significance of the slope of this graph.

2.Second, After plotting the current and the reciprocal of the resistance, what is the slope and what does it represent? what relationship exist between Current and 1/Resistance

3. Last, In theory what current passes through a circuit having an 11-Ohm resistance connected across a 110-V line? 220-V Line?

P.S.
In the first question the Resistance or Ohms in the unit kOhms is constant with an incresing Voltage expressed in V. So is the Current in the unit of mA is it increasing or not?

In the 2nd question the Voltage is constant again is expressed in V with an decreasing resistance. So again is the Current in the unit of mA is it increasing or not?

2007-09-29 23:38:38 · 1 answers · asked by gcz79 2

What prevents an electron from flying off from an atom and what prevents an electron from trying to reach singularity with an atom?

2007-09-29 22:22:34 · 5 answers · asked by Anonymous

A satellite is in a circular parking orbit of radius rp=7337km from the centre of the earth. Determine the velocity increases v2-v1 and v4-v3 necessary to perform a hohmann transfer to a circular orbit with radius equal to the radius of the moon's orbit, 383,000km

Full working and the formula u used would be appreciated

2007-09-29 20:10:03 · 1 answers · asked by Anonymous

2007-09-29 19:33:57 · 19 answers · asked by richi b 2

Please use the quadratic function in solving. Sorry I've not specified yesterday that it was a rectangular lot. Please do help me,it's my project please.

2007-09-29 19:27:05 · 2 answers · asked by Anonymous

Calculate the PRP,PRF,PD,DF, wavelength,SPL of reflector interface and period if a 3 cycles pulse emitted from a 5 MHz transducer if the echo time received was 10ms in soft tissue?

I tried to answer this homework but, I couldn't get the right answer.

PRP = Pulse Repetition Period
PRF = Pulse Repetition Frequency
PD = Pulse Duration
DF = Duty Factor
SPL = Spatial Pulse Length

2007-09-29 18:01:18 · 2 answers · asked by julie p 1

even light from a reflection has depth from the proton's. does this mean that everything is 3 dimension on this planet? and if this is so, how can space be more than 3 dimensions? since time is an illusion based on mans attempt to control his environment, it seems that time is not the 4th dimension. just some random thought today on spacial theorems.

2007-09-29 17:25:55 · 3 answers · asked by 1001001 2

physics pls

2007-09-29 17:19:58 · 4 answers · asked by PaLoS 1

2007-09-29 17:17:32 · 2 answers · asked by Maria Margarita C 1

need basis on physics

2007-09-29 17:17:13 · 3 answers · asked by PaLoS 1

Okay, so here goes:

I've been reading about Niels Bohr and Heisenberg, and the whole nature-of-the-atom thing. Really geeky-cool! But now I have this VERY specific question, one that hasn't been answered by searching through countless webpages.

The electrons going around the nucleus can only exist in certain orbits - and they don't actually travel from one orbit to the next. Instead, they disappear in one orbit, only to reappear in the one above or below.

Alrighty: where are they when they're in between? Since they're like waves, are they actually *cancelling one another out*, like the crest and trough of a wave do? That would make sense, but that conclusion is only an extrapolation from what I've read... and a long shot at best.

Maybe this one of those questions that nobody really knows the answer to, yet? I hope someone can satisfy my curiosity!

Thanks in advance,

-K

2007-09-29 17:12:00 · 6 answers · asked by Anonymous

faster average speed depending on the surface, but does the rate at which it decelerates follow the same rules as it would on any surface, or does the deceleration rate change and not obey any rules. for example, a falling object accelerates 9.8 m/s/s and after the 2nd second you would multiply that by 2 after three seconds you would multiply that by 3 and so forth...it basically follows a rule regardless of mass. my question is whether an object will become slower on a ruff surface at a much faster rate than it would if it were on another surface which was more smooth. i already know it will go slower from the get go.

2007-09-29 17:05:39 · 2 answers · asked by Backtash123 1