Needle Definition and 65 Threads

A hypodermic syringe contains a medicine with the density of water (see figure below). The barrel of the syringe has a cross-sectional area of 2.20 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A force of magnitude 1.80 N is exerted on the plunger...

[SOLVED] Needle and pressure (Bernoulli's equation?) Homework Statement A hypodermic syringe contains medicine having the density of water. Barrel has cross sectional area A= 2.50x10^-5 m^2 and the needle has a cross sectional area a= 1.00x10^-8 m^2. IN the absence of a force on the plunger...

What force on the plunger would be needed to push fluid into a vein where the gauge pressure is 18 mm Hg? Answer for the instant just before the fluid starts to move. I know i need the density of mercury (in Meters) and that equals = 13.534e-3 / 100 which is 1.3534e-4 for the density...

Homework Statement In what direction does a compass needle point? (More than one answer may be true.) T/F In the direction of the magnetic field lines at the location of the compass. T/F Toward the north magnetic pole if a bar magnet is brought near the compass. T/F Toward the south...

OK, so I'm new here and really lost on how to these two problems involving blood pressure and syringe force etc. Any help would be appreciated, and if you could somewhat explain how you solved it that would be great, so I can know how to do this in the future. Homework Statement 1...

Hi, I was given a problem by the professor, and I feel like I do not know where to begin. Well, here is the problem: -------- Endless, parallel East-to-West lines are spaced 2 inches apart on the ground, and a needle of length 1 inch is randomly tossed on the ground. Compute the probability...

In the "buffons needle" riddle you have a paper with horizontal lines in it all 1 unit apart and you drop a needle 1 unit long - you have to calculate the chance that the needle will hit a line. but i remembered the riddle wrong so instead i tried to solve the same question with both horizontal...

1)The time period of a dip needle vibrating in the vertical plane in the magnetic meridian is 3 seconds. When the same magnetic needle is made to vibrate in the horizontal plane, the time period of vibration is 3(2)^(1/2). What is the angle of dip of the place? I think in both the cases, it is...

1)does a magnetic compass needle have high remanence or low remanence? 2)in a shell type transformer core required to carry DC in addition to normal AC, what effect does the introduction of an airgap have on AC performance of such transformers.

http://www.mste.uiuc.edu/reese/buffon/buffon.html#questions can someone explain problem "A" for me please. this isn't for school or homework but just something that i don't understand and would like to know where I'm going wrong. how would i go about solving question "A"? thanks

Like personally I have a needle phobia. That's for sure. No idea of the real phobia name. I also have like a sort of good reason why. When I was young I had a very bad asthma attack, i was hospitalized, when i was there. They needed to needle something to get my asthma attack under control. I...

Hi! I would be extremely grateful if anyone could help me figure out this mess... I hadn't touched mechanics for too many years and I guessed i gotten myself a little confused... I am trying to model a 3D needle/object in a virtual world... I have done the part on freebodies collision... but...

Now that HIVs is more rampant across North America, and that there are plenty of careless drug users out there with needles, nothing freaks me out more than a syringe. In fact, I stepped on one once (don't worry, didn't penetrate). It still freaked me out. Now, people are using needles as...

A friend of my mother is a caretaker and accidentially stuck herself in the finger with a needle used on an HIV patient. It probably won't be until 6 mo from now until it can be diagnosed whether an infection has taken place. I was wondering, what are the chances that HIV is contracted and is...

I have seen designs of electron sources that use a heated filament to create a cloud of electrons then apply a voltage across them to accelerate them for whatever purpose. Could you replace the filament with a needle spraying the electrons?