Physics - October 2007

2007-10-27 05:42:42 · 3 answers · asked by lakshmi n 1

i am going to need to know the name, the symbol, how its used in nature and in real life and a picture of it so i need a lot of information about it so i want it to be simple but not too hard

2007-10-27 05:39:49 · 3 answers · asked by Krista 1

supply has an emf of 6.0v and internal resistance of 5.0 ohms, it delivers power to TWO external resistors. Maximum power is dissipated in he external resistors when the resistance of them is equal to the internal resistance of the supply. R2 has a resistance of 15 ohms and R1 has resistance 7.5 ohms. Calculate the power dissipated in the 15 ohms resistor when the supply is delivering maximumpower to the external circuit

2007-10-27 05:29:20 · 1 answers · asked by Anonymous

2007-10-27 05:27:54 · 1 answers · asked by Anonymous

major help required....this might be complicated it you dont kno what an Atwood machine is tho so heres a pic
http://spiff.rit.edu/classes/phys311/workshops/w5b/slide_block.html

ok so if M1=2kg and the static and kinetic friction between m1 and the inclined plane are .3 and .2, respectively...(and the angle of the plane is 37 degrees)

A-what is m2 if both objects are to remain at rest?
b-what is m2 if both masses are moving at a constant velocity?



the book says a is between .72kg and 1.7kg
and b is between .88kg and 1.5 kg

2007-10-27 05:05:24 · 1 answers · asked by Anonymous

I have been working my grade 11 physics project regarding the making of a slide show on physics of safe driving. I keep reading over notes and assignments and trying to incorporate what I have learned in kinematics (ie the kinematics equations) and dynamics. But it's just so hard for me. So far I have a few good slides. How do I incorporate subjects like the force of gravity Newton's laws of motion and other subjects into my presentation? Please answer my question as simply as you can and as quick as you can because my project is due soon!

2007-10-27 04:47:48 · 1 answers · asked by bookwormgrl 1

2007-10-27 04:34:36 · 7 answers · asked by futuretopgun101 5

Would the even be a point of people becoming physisicts any more if everything is already solved?

2007-10-27 04:11:24 · 14 answers · asked by Anonymous

A bullet shot from a very high velocity rifle may travel one hundred feet or more without dropping at all.

a) True
b) False

2007-10-27 04:04:24 · 6 answers · asked by ? 6

It is a project at school. It has to be IN A BOX that is no bigger than 1000 cm cubed (yes, that is very small).

So, any ideas on: a. where to get a box and what it should be made of, and/or b. what i can put in the box to stop it from breaking.

2007-10-27 03:54:53 · 9 answers · asked by Casey K 2

I thought of this question suddenly when I was bored.

Imagine having a very long metal rod, so long that it's about the diameter of the Earth. If I place the metal rod in front of me, parallel to Earth's surface, wouldn't it be like a tangent to a circle, and the rod would extend beyond the Earth's atmosphere and to space?

Some might say that the rod will bend downwards and never extend to space.

But what if I had a extremely powerful laser, of which its beam is very visible (think the Death Star laser), and shine it parallel to the Earth's surface? Would it extend to space? If it bends, then it contradicts the fact that light cannot bend (yes I know it can bend under certain circumstances, but definitely not now).

Just a few thoughts.

2007-10-27 03:54:40 · 3 answers · asked by darrenfoong1 2

2007-10-27 02:59:26 · 10 answers · asked by spencer 2

Here i am talking of the whole earth but not the surface because the total energy reaching the surface is 47% of the total that is falling in the earth`s periphery.

2007-10-27 01:09:20 · 8 answers · asked by ravi 2

Almost every introductory article in relativity says that if I go in a spaceship and travel at speeds approaching the speed of light, on my return I will find that much more time has passed on earth. Now here's my problem. Since all movement is relative, you can't really say whether earth moved at those speeds in relation to me, or the other way round.So what determines that myself and the loyal earthling will agree afterwards, that time has definately passed slower in the spaceship?

2007-10-27 00:56:01 · 7 answers · asked by kwaaikat 5

2007-10-26 22:00:31 · 2 answers · asked by ed e 1

A perpetuum mobile is defined as a machine that is providing mecanical energy whithout an external energy suply.

2007-10-26 21:58:08 · 5 answers · asked by Anonymous

The reason why I asked this was because when we sleep, it doesn't take very long for the morning (or waking up), it's so quick. You sleep and you wake up so fast (it's like were sleeping for 2 hours or less).

If were awake the whole night, that would take ages for the sun to come up (I've tried it).

Why is that when we sleep, the time goes SO SO fast? Are we ACTUALLY traveling through time?

2007-10-26 19:02:20 · 8 answers · asked by Anonymous

I saw this on you tube. Where is the energy coming from??????? And if this is real why can't we use this for cars???? I think that they have some guy with an electric motor hooked up to it.. http://www.youtube.com/watch?v=YvHb41KP7To
http://www.youtube.com/watch?v=PFGiWiXMHn0
http://www.youtube.com/watch?v=uHffliC2whk
http://www.youtube.com/watch?v=kCr3lOhMJCg

2007-10-26 18:28:33 · 6 answers · asked by Watel 2

2007-10-26 16:57:06 · 5 answers · asked by Anonymous

my husband couldn't think of it and said "magic?"

2007-10-26 16:43:39 · 6 answers · asked by Anonymous

2007-10-26 13:41:07 · 10 answers · asked by Anonymous

Two wires are tied to the 500 g sphere shown in figure. The sphere revolves in a horizontal circle at a constant speed of 8.30 m/s.

What is the tension in the upper wire?

What is the tension in the lower wire?

2007-10-26 12:44:03 · 1 answers · asked by katie m 1

Why is more impulse delivered during a collision when bouncing occurs, than during one when it doesn't?

P.S. I'd appreciate if u'd give me a legit answer-don't put simple pointless ones like 'i don't know'. If u don't know, then common sense tells u don't answer.

2007-10-26 12:22:07 · 5 answers · asked by Rosy 2

I have a vacuum oven. heat . hold. stop heater. vacuum on. hold. stop vacuum. this goes on for many cycles.
water boils at 100deg C at 760 Torr.
water boiling point decreases as pressure drops ( vacuum ).
wetted part - shouldn't it dried under lower pressure.
Anything to do with sudden vacuum, temp drops?
Not very clear on this theory. Please explain. Thanks.

2007-10-26 12:21:11 · 2 answers · asked by Charles T 1

“Imagine a plane is sitting on a massive conveyor belt, as wide and as long as a runway. The conveyer belt is designed to exactly match the speed of the wheels, moving in the opposite direction. Can the plane take off? “

2007-10-26 12:14:35 · 5 answers · asked by tru_story 4

2007-10-26 11:38:37 · 3 answers · asked by Ken 1

2007-10-26 11:37:10 · 37 answers · asked by Anonymous

A 900 g ball moves in a vertical circle on a 1.09 m-long string. If the speed at the top is 3.90 m/s, then the speed at the bottom will be 7.61 m/s.

What is the ball's weight?

What is the tension in the string when the ball is at the top?

What is the tension in the string when the ball is at the bottom?

2007-10-26 11:15:57 · 5 answers · asked by katie m 1

An archer pulls her bowstring back 0.420 m by exerting a force that increases uniformly from zero to 222 N.
(a) What is the equivalent spring constant of the bow?

(b) How much work does the archer do in pulling the bow?

2007-10-26 11:02:28 · 3 answers · asked by bob 1

block A has mass m_A = 2.09 kg, block B has mass m_B = 0.450 kg, and the rope connecting them has a nonzero mass 0.159 kg. The rope has a total length 1.07 m and the pulley has a very small radius. Let d be the length of rope that hangs vertically between the pulley and block B. Ignore any sag in the horizontal part of the rope.

If there is friction between block A and the table top, with mu_k = 0.201 and mu_s = 0.248, find the minimum value of the distance d such that the blocks will start to move if they are initially at rest. Ignore any sag in the horizontal part of the rope.

Force of the hanging mass is that of the vertical portion of the rope + mass of Block B * gravity
(M_r + M_B)(g) +
(.159+.450)(9.8) = 5.9682N = -5.9682N = Fnet of Block B

Tension T from Block A equals to Fnet of Block B = 5.9682N
Static Friction = (0.248)(n) = -5.079N

n = Mass of Block A * gravity = (2.029)(9.8)

Do I need Kinetic Friction in this problem?

Please Guide me. I'm Lost...

Thank You

2007-10-26 10:56:07 · 1 answers · asked by Anonymous