Generation Alzheimer’s: The Defining Disease of the Baby Boomers

This year, the first of the Boomer Generation turns 65 and with increased age comes increased risk of developing Alzheimer's disease. To bring urgently-needed attention to the risk facing the Boomers, the Alzheimer's Association recently released a groundbreaking study titled, Generation Alzheimer's: The Defining Disease of the Baby Boomers.

"Alzheimer’s is a tragic epidemic that has no survivors. Not a single one," said Harry Johns, president and CEO of the Alzheimer’s Association. "It is as much a thief as a killer. Starting this year, more than 10,000 baby boomers a day will turn 65. As these baby boomers age, one of out of eight of them will develop Alzheimer’s – a devastating, costly, heartbreaking disease. Increasingly for these baby boomers, it will no longer be their grandparents and parents who have Alzheimer’s – it will be them. It is estimated that 10 million baby boomers will end up developing Alzheimer's Disease.

In addition to the human toll, over the next 40 years Alzheimer’s will cost the nation $20 trillion, enough to pay off the national debt and still send a $20,000 check to every man, woman and child in America. And while every 69 seconds someone in America develops Alzheimer’s disease today, by 2050 someone will develop the disease every 33 seconds - unless the federal government commits to changing the Alzheimer’s trajectory.

Generation Alzheimer's: The Defining Disease of the Baby Boomers, sheds light on a crisis that is no longer emerging – but here. If you’d like to view a full copy of this report please visit www.alz.org/boomers.

The Alzheimer's Association is the world’s leading voluntary health organization in Alzheimer’s care, support and research. Our mission is to eliminate Alzheimer’s disease through the advancement of research; to provide and enhance care and support for all affected; and to reduce the risk of dementia through the promotion of brain heal

Send me your questions

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All of us have problems in a subject like physics . So I invite you all to send me your queries at any of my mail address mailmephysics12@rediffmail.com or at physicsexpert12@gmail.com . I would try my best to solve your queries and would post them on my blog. If you have anything you want to share (related to physics, mathematics, chemistry, managing competitions etc.) with visitors of my blog feel free to mail me your article along with your link.
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Magnetic force on charged particle in a magnetic field

Question: Describe the magnetic force on the particle if it is at rest; it moves along  the direction of the magnetic field; it moves opposite the direction of the magnetic field; and if its at right angle with the direction of the magnetic field.
Answer:

1. In a magnetic field B, a particle of charge q and velocit v experiences a force,

F = q(v X B)

If v = 0, the F = 0 and hence the particle experiences no force.

(Here, bold letters represent vectors)

2. if the particle moves in the direction of the field then F=qvBsin(0) = 0 again particle does not experience any force when it move parallel to the magnetic field.

3. Again F=0 for the case when particle moves in a direction opposite to the field as 

F=qvBsin(180) = 0 since the angle between B and v is 180 degree.

4. In case B and v are both perpendicular to each other then charged particle will follow the circular path .

For detailed treatment visit http://physicscatalyst.com/magnetism/mag_0.php

Rigid Body Rotation Question 1

Question:
A rigid body of radius of gyration k, mass m and radius R rolls without slipping down a plane inclined at an angle θ  with the horizontal. (a) Find its acceleration and frictional force acting on it . (b) If the body were in the form of a disc and θ=30º , what will be the acceleration and the frictional force acting on it.

Solution:
for solution click this link

conceptual physics Centripital force

Hi all
I came across this video while browsing you tube and i like the way it explains about what is the concept of centripetal force.

How to calculate the direction of induced emf : Lenz's law

• The direction of induced current and emf is given by lenz's law.
  
• Due to change in magnetic flux through a closed loop an induced  current is established in the loop.
  
• Lenz's law states that
    'The induced current due to the induced emf always flow in such a direction as to oppose the change causing it'
  
• Now we can combine faraday's law  to find the direction of emf.
  
• Thus we can say that "The emf induced in a coil is equal to the negative rate of the change of the magnetic flux linked with it "
  
  
  
  
  
  

Explaination of lenz's law

• To explain this law again consider faradays experiment 1 in which north pole of the magnet  moves towards a closed coil.
  
• This movement of north pole of magnetic induces current in the coil in such a direction so that end of the coil ,facing and approaching north pole becomes a magnetic north pole.
  
• The repulsion between two poles opposes the motion of the magnet towards the coil.
  
• Thus work has to be done to push the magnet against  the coil.
  
• It is this mechanical work which causes the current to flow in the coil against its resistance R and supply
  the energy for the heat loss.
  
• The mechanical workdone is converted to electrical energy which produces the heat energy.
  
• If the direction of the induced current were such as not to oppsose the motion ,then we would be obtaining electrical energy continuously without doing any work ,which is impossible.
  
• So ,every things seems to be all right if we accept lenz's law otherwise the principle of conservation of the
  energy would be violated.
  
• Direction of the induced current can be found using Fleming right hand rule.
  " If we stretch thumb ,index  and middle finger  perpendicular to one another then index fingers points in direction of the magnetic field ,middle finger in direction of induced current and thum points in direction of the motion of the conductor"
  

Optics subjective question 1

Question
A narrow monochromatic beam of light of intensity I is incident on a glass plate A as shown below in the figure

Another identical glass plate B is kept close to A  and parallel to it. Each glass plate reflects 25% of the light intensity incident on it and transmits the remaining.Find the ratio of maximum and minimum intensities in the interference pattern formed by the two beams obtained after reflection from each plate.

Solution:

Hi First try to solve the question on your own it's an easy one . The answer is ratio of intensities is 49. I will provide the solution to this question.

For solution visit link