Science & Mathematics - 7 November 2006

Please give me the answer of these questions ( as much as u can) and i will give u your ten points.

1) Use ideas of electromagnetic induction to explain how the input voltage is transformed into an output voltage. Use the 3 questions below to help u with your answer.

a)What happens in the primary coil?
b)What happens in the core?
c)what happens in the secondary coil?

2)Explain how in the transformer :
a) a continuously varying magnetic flux is produced in the primary coil.
b)the varying magnetic flux is passed from the primary to the secondary coil.
c)an e.m.f is generated across the secondary coil.

This question is not on transformer but if u can answer it it would be great.

Why should we not handle a radioactive source with bare hands.

2006-11-07 06:31:31 · 4 answers · asked by nauroze_hoath 2 in Physics

if events A and B are disjoint, A and C are independent, B and C are independent then the intersection of A, B and C is 0....

2006-11-07 06:27:03 · 12 answers · asked by kate 1 in Mathematics

if events A and B are disjoint, A and C are independent, B and C are independent then the intersection of A, B and C is 0....

2006-11-07 06:25:21 · 5 answers · asked by kate 1 in Mathematics

2006-11-07 06:24:57 · 15 answers · asked by eddie g 1 in Earth Sciences & Geology

2006-11-07 06:24:30 · 5 answers · asked by valeria_serrano1 2 in Earth Sciences & Geology

A typical GPS (Global Positioning System) satellite orbits at an altitude of 4.1 107 m.
(a) Find the orbital period of such a satellite.
hours
(b) Find the orbital speed of such a satellite.
km/s

2006-11-07 06:23:18 · 2 answers · asked by amandajohnsonllc 1 in Physics

2006-11-07 06:22:31 · 6 answers · asked by Zoe C 2 in Astronomy & Space

An astronaut exploring a distant solar system lands on an unnamed planet with a radius of 2550 km. When the astronaut jumps upward with an initial speed of 3.51 m/s, she rises to a height of 0.72 m. What is the mass of the planet?
kg

2006-11-07 06:22:25 · 4 answers · asked by amandajohnsonllc 1 in Physics

2006-11-07 06:20:53 · 6 answers · asked by Anonymous in Earth Sciences & Geology

An elevator hangs from a cable that goes around a pulley of diameter 7.7 feet. If the elevator climbs 181 feet in 17.2 seconds at a constant speed, determine the angular velocity of the pulley in revolutions per second. Your answer must be accurate to three decimal places.

2006-11-07 06:20:48 · 2 answers · asked by AppleCard! 2 in Physics

Here is the origional Formula
w=a*x^3+b*x^2+c*x+d

I need to re-arange the formula so that I can input a "x" to get the "w".

This is a calibration curve for a basis weight sensor the x is a voltage ratio and the w is weight in grams per square meter.

Thanks

2006-11-07 06:19:00 · 4 answers · asked by A W 2 in Mathematics

2006-11-07 06:18:16 · 5 answers · asked by Anonymous in Mathematics

2006-11-07 06:14:28 · 4 answers · asked by taylor c 1 in Chemistry

2006-11-07 06:13:53 · 4 answers · asked by Anonymous in Weather

2006-11-07 06:13:11 · 5 answers · asked by Abigail C 1 in Zoology

2006-11-07 06:13:09 · 4 answers · asked by lucky 1 in Engineering

i have heard the russians didn't attemp to land on the moon because they knew the risk of radiation poisoning if anyone landed or went near it so they concentrated on sending probes to venus.

2006-11-07 06:12:47 · 7 answers · asked by Anonymous in Astronomy & Space

I think I'm doing it right,but I'm not sure.It gives like the number on the graph but then it tells u to line it to a number thats not there.The number is 2,100,do I draw the line inbettween the two numbers???someone plez help me!!!!!!!

2006-11-07 06:11:33 · 6 answers · asked by Ashley 2 in Mathematics

How can I proove that sequence Xn+1=0.5(a+Xn) (0

2006-11-07 06:10:00 · 4 answers · asked by popspira 1 in Mathematics

2006-11-07 06:09:15 · 14 answers · asked by AudioMog 2 in Astronomy & Space

2006-11-07 06:08:46 · 6 answers · asked by DONNA M 1 in Astronomy & Space

2006-11-07 06:08:22 · 8 answers · asked by erin S 2 in Chemistry

2006-11-07 06:07:52 · 14 answers · asked by bubbajack666 1 in Chemistry

What does it mean ? This is in france .

2006-11-07 06:07:40 · 9 answers · asked by .x. Ultraviolet .x. <3 2 in Weather

2006-11-07 06:06:56 · 10 answers · asked by Gabriela F 1 in Astronomy & Space

Can we have something like -2.5%? or (2.5)%

2006-11-07 06:06:09 · 3 answers · asked by Anonymous in Mathematics

A bowling ball has a mass of 3.00 kg, a moment of inertia of 1.60 10-2 kgm2, and a radius of 0.100 m. If it rolls down the lane without slipping at a linear speed of 6.00 m/s, what is its total energy?

I wanted to assume that because it's rolling and moving it would have both rotational kinetic and translational kinetic energy so the formula would be:

KE = 1/2mv^2 + 1/2Iw^2
(1/2)(3)(6^2) + 1/2((1.60x10^-2)^2)(w^2)

and for w^2, I thought that I could use the tangential velocity of 6.00 m/s and set it equal to r/w. Which would give me a value of:
w= .1/6 = .0166666....

Plugging in all the numbers gives me KE = 54.0. I tried both 54 and 54000, since it wants it in J. Where did I go wrong?

2006-11-07 06:03:51 · 1 answers · asked by flossie116 4 in Physics

2006-11-07 06:03:46 · 6 answers · asked by notorious_d_m_j 1 in Mathematics

2006-11-07 06:03:13 · 16 answers · asked by Gabi Morena 1 in Astronomy & Space

unfortunatly I have to calculate it so saying that it is the same as the volume isn't going to help..becuase mass and volume are different.

2006-11-07 06:01:33 · 3 answers · asked by Alexx 2 in Physics