Physics - February 2007

2007-02-26 17:40:01 · 5 answers · asked by Anonymous

2007-02-26 17:37:33 · 5 answers · asked by amrita b 1

2007-02-26 17:28:32 · 1 answers · asked by hoejyland 3

my homework is due for tomorrow. i need help right away, please!

2007-02-26 16:52:27 · 3 answers · asked by Anonymous

Thanks............

2007-02-26 16:39:48 · 7 answers · asked by Anonymous

Hi,

There is a cable that consists of a solid inner conductor with radius R1, surrounded by a hollow, very thin outer conductor with radius R2. The two carry equal currents I, but in opposite directions. The current density is uniformly distributed over each conductor.

a) Find expressions for the 3 magnetic fields: within the inner conductor, in the space between the conductors, and the outside of the outer conductor.

b) Graph B versus r from r = 0 to r = 2(R2) if R1 = (1/3)(R2)


I am thinking of using the formula of B = v x (Uo)/(4pi) x q/r^2 x r(hat). Am I on the right track. Any help would be appreciated!


Thanks!

2007-02-26 16:31:19 · 1 answers · asked by Anonymous

2007-02-26 16:12:09 · 9 answers · asked by blah 6

Calculate the percent difference between your weight in Sacramento, near sea level, and at the top of Mount Everest, which is 8,800 meters above Sea Level?? Steps Please

2007-02-26 16:11:46 · 1 answers · asked by Franklin 2

2007-02-26 16:11:23 · 2 answers · asked by JAMES 4

you dont have to give me the answer. just the formula on how to do this would be enough. im really lost. any help would be appriciated. so here it is.

what is the resulting temperature if 6000 grams of water at 60'C is mixed with 400 grams water at 100'C in a container of neglible thermal capacity?

thanks....

2007-02-26 16:08:02 · 3 answers · asked by Anonymous

A 2.21 µF capacitor is charged by a 20.0 V battery. It is disconnected from the battery and then connected to an uncharged 3.60 µF capacitor
http://www.webassign.net/giancoli5/17_28.gif
Determine the total stored energy after they are connected

2007-02-26 15:53:53 · 3 answers · asked by Anonymous

2007-02-26 15:43:29 · 7 answers · asked by ad_sessionrd 2

So I did this lab in my physics class (it's a freshman class, we haven't even taken Calculus yet, I hear that would make it soooo much easier) and I understand none of it, my lab partner did most of it and didn't bother to try to explain it, and anyway we have this graph and oh, we were measuring the spring constant of a single spring, however using different masses hanging off of it, and we have a graph in LoggerPro and it's Force (N) versus Distance (m) and my lab partner sent me the graphs and what's left to do, which is find the 'r' value as well as 'r^2', which I have the tiniest inkling of even what they are. I know it has to be between one and negative one and that the closer it is to either end of that spectrum, the better, but other than that I am completely lost. Does anyone have an idea
a) what I'm going on about
or, hopefully,
b) what I need to do to get said 'r' values?

2007-02-26 15:26:05 · 3 answers · asked by Lauren 2

click fo picture http://www.webassign.net/sf5/p18_47.gif

2007-02-26 15:23:26 · 2 answers · asked by Anonymous

If its spring is compressed a distance of 0.180 m and the gun fired vertically as shown, the gun can launch a 21.0 g projectile to a maximum height of 18.0 m above the starting point of the projectile.

(a) Neglecting all resistive forces, determine the spring constant.
______N/m

(b) Neglecting all resistive forces, determine the speed of the projectile as it moves through the equilibrium position of the spring (where x = 0)_______m/s

need help one this one guys. Thanks

2007-02-26 15:23:08 · 1 answers · asked by cosmo 1

parallel to the incline. If the coefficient of kinetic friction between box and incline is 0.220, calculate the change in the kinetic energy of the box.
______J

Need help on this one. Thanks guys

2007-02-26 15:20:17 · 1 answers · asked by cosmo 1

when the ropes of the the swing make an angle of 28.0° with the vertical

(a) Neglecting friction, find the child's speed at the lowest position.____m/s

(b) If the speed of the child at the lowest position is 2.30 m/s, what is the mechanical energy lost due to friction?____J.

hey guys I keep getting the wrong answer. Can you show me how to get to the answer? Thanks

2007-02-26 15:10:29 · 3 answers · asked by cosmo 1

A 2.46 µF capacitor (#1) is charged to 901 V and a 7.19 µF capacitor (#2) is charged to 579 V. The capacitors are then disconnected from their batteries. Next the positive plates are connected to each other and the negative plates are connected to each other. Find final charge and final potential difference on both.

When I tried doing this I got 4.962189e-4 as on of the charges ..but it's not right.. so I dunno what I'm doing wrong.. >_<

2007-02-26 15:08:04 · 1 answers · asked by Anonymous

The m1 = 5.35 kg object is released from rest at a point 4.00 m above the floor, where the m2 = 2.70 kg object rests.


a)Determine the speed of each object when the two pass each other.______m/s

b) Determine the speed of each object at the moment the 5.35 kg mass hits the floor.______m/s

c)How much higher does the 2.70 kg mass travel after the 5.35 kg mass hits the floor?_______m

need help on this one guys. thanks alot.

2007-02-26 15:07:42 · 1 answers · asked by cosmo 1

2007-02-26 14:55:19 · 3 answers · asked by Anonymous

Hi everyone. I've been trying to do my WebAssign for AP Physics for over a few hours now, and I've done every question except one (that has two parts). Any help would be wonderful. I have a test on these types of questions tomorrow, and I would greatly appreciate any help from anyone.

The question(s) is/are as follows:

R = 15 ohms
(a) Find the current in the 15.0 ohm resistor.
(b) Find the potential difference between points a and b.

This is the link to a picture of the circuit: http://i31.photobucket.com/albums/c395/thisusernameisthebes/p28-09alt.gif

I would so very much appreciate any help from anyone. It seems like a simple question, but is causing me so much grief. Thank you so much everyone!

2007-02-26 14:42:37 · 3 answers · asked by thisusernameisthebes 2

Can someone please help me find the central force and centipetal accleration of this promblem. I JUST DONT GET IT! The question is: The Speed of the hydrogen atom electron travels as a speed approximated 2.45 x 10 ^ 6 m/s. Find the central force acting on the electron as it revolves in a circular orbit of a radus 4.68 x 10 ^ -11. Second part of the question is what is the centripetal acceleration of the electron?

2007-02-26 14:41:15 · 1 answers · asked by candy525 1

2007-02-26 14:27:40 · 1 answers · asked by Anonymous

2007-02-26 14:11:44 · 15 answers · asked by canislupus 3

2007-02-26 14:07:41 · 3 answers · asked by Anonymous

57.5 degrees what is the angle in polythylene

2007-02-26 13:50:58 · 1 answers · asked by lindi 2

2007-02-26 13:28:10 · 6 answers · asked by Shirley Pearls 2

You testify as an "expert witness" in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (Fig. 6-27). You find that the slope of the hill is = 12.0°, that the cars were separated by distance d = 26.0 m when the driver of car A put the car into a slide (it lacked any automatic anti-brake-lock system), and that the speed of car A at the onset of braking was v0 = 17.5 m/s.

At what speed did car a hit car b if coefficient of kinetic friction is .6?

and then if it is .1?


I've been at this problem for two days now. countless people have tried to hint at it, but i just don't understand it. An explanation w/ an answer would be great.

I have an 11 Pm deadline, or else I don't get credit.

2007-02-26 13:26:45 · 2 answers · asked by Anonymous

A jet plane comes in for a downward dive. The bottom part of the path is a quarter circle having a radius of curvature of 350 m. According to medical tests, pilots lose consciousness at an acceleration of 5.50 g. At what speed (in m/s and mph) will the pilot black out for this dive?

I know that v=sqrt(a*r), which will be in m/s for the first question and then I have convert m/s into mph for the second question which is easy as pie. The only thing is I don't know what the g in the 5.50g acceleration means...can someone help me please? Thanks a bunch.

2007-02-26 13:15:55 · 5 answers · asked by megwiz12 2

Hi! Do the three laws of Newton break down at the quantum level (for protons, electrons, neutrons, quarks, anti-matter) or we do not apply Newtonian mechanics at all at quantum level?
What is an electron? Does it exhibit wave like properties or magnetic properties, besides its usual electrostatic charge of -1? How does it travel? In a cloud of electrons or in straight lines?
Do Newtonian mechanics work at astrophysical level? In black holes, galaxies, Pluto, Saturn and other planetal level?

You may answer selectively. Thank you. I am not looking for a complete answer.

2007-02-26 13:08:33 · 4 answers · asked by Nicey8 5