Physics - March 2007

Is Magnetic Induction any role to play in Global warming or in Geography?

2007-03-20 18:15:37 · 8 answers · asked by always debtor 1

2007-03-20 18:02:26 · 7 answers · asked by noda 1

is he underated? i surely think he was he had many amazing inventions that arent even talked about and he was ahead of his time !

2007-03-20 17:50:27 · 8 answers · asked by Tony M 1

you know that particle accelator in switzerland that michio kaku talks about can revolutionize the world of physics ! when are they gonna start it and what do you expect can happen? will it tear the earth up? or wil it be safe and what unbelavable findings will be made? any predictions or comments?

2007-03-20 17:47:33 · 4 answers · asked by Tony M 1

I need to design a board that will reverse the direction of the current when there a switch is pressed, and the second switch signal would reverse it again. Please tell me the name of such a layout (if it exist), or explains how it works.

2007-03-20 17:42:27 · 2 answers · asked by Lie Ryan 6

Hey I am wondering

a.) What does the slope of an acceleration vs. net force graph represent?

b.) What does the slope of a mass^-1 vs. acceleration graph represent?

2007-03-20 17:01:32 · 3 answers · asked by steve_123 2

2007-03-20 17:01:06 · 4 answers · asked by Anonymous

2007-03-20 17:00:55 · 5 answers · asked by Anonymous

2007-03-20 16:52:07 · 6 answers · asked by Anonymous

2007-03-20 16:49:32 · 5 answers · asked by ? 2

Here are the given:
Mass of Rocket = 5600 kg
Velocity of Rocket = 2900 m/s
Velocity of Gass Burst = 4300 m/s

The question says that a rocket is travelling toward the moon at the speed given above. To change the trajectory of the rocket, the engine fires a burst of gas perpindicular to the motion of the rocket at a speed given above.

What is the mass of the gas burst expelled? In kg.

Here is what I did (Used Conservation of Momentum)

(5600)*(2900) = [ (5600)*Vf rocket ]+ [ M gas burst * (4300) ]

I drew a diagram on an x, y axis, with the rocket initially moving all in the positive x direction with a velocity of 2900. Then I drew the gas velocity velctor of 4300, completely perpindicular (all in y direction). Using pythag. thm I solved for the magnitude of the total final velocity of the rocket. I got V f rocket = 5186.52
I plugged this value in, and found the final momentum of the rocket to be 2.90445e7. I then plugged and solved for M gas.
This didn't work, what am I missing?

2007-03-20 16:22:01 · 1 answers · asked by Anonymous

Please tell me sites with good info about light like how/what it is made of (or hw is it made).

2007-03-20 16:13:22 · 2 answers · asked by ☼Scientific Athletic♫ 4

WHat is light exactly made of or try to answer this question with a close answer PLease. Thanks

2007-03-20 16:11:48 · 11 answers · asked by ☼Scientific Athletic♫ 4

So wot is light exactly? PLease good descriptions.

2007-03-20 16:10:40 · 4 answers · asked by ☼Scientific Athletic♫ 4

let us consider an object launched vertically upward with an initial speed v. Neglect air resistance.

At what height h above the ground does the projectile have a speed of 0.5v?
Express your answer in terms of and the magnitude of the acceleration of gravity g.

ok so i found hmax to be (v^2/2g) and i thought that the h at 0.5v would be 1/4of hmax and it's telling me that i am off by a multiplicative factor.

2007-03-20 15:52:01 · 5 answers · asked by ♡♥EM♡♥ 4

I watched a programme about superconductors and their uses and also read on the web that the following would be the uses of room tempreature superconductors, but what does this mean to someone who does not have much scientific knowledge:

transformers, power storage devices, electric power transmission, electric motors, magnetic levitation devices etc.

It all sounds amazing but what specific devices would this cover and is it ever going to be a real possibility, what challenges are ahead for this technology?

2007-03-20 15:50:38 · 4 answers · asked by Hunkydory 1

Since times smaller than the planck time are meaninless, would it mean that time is discrete?

2007-03-20 15:49:34 · 5 answers · asked by the redcuber 6

ok im not trying to bullshit anyone with this but im going to tell a story and something about me. I was sleeping at my nephews in his room. he was on his bed sleeping with a small dog and i was sleeping on the ground with some blankets. i coundn't sleep at all, which is normal for me anyways. my schizophrenia at the time would answer that. When i was laying on the ground i felt something touch me on the leg. i immediately looked up and saw that my nephew and dog were sound asleep. i thought it was the dog or something that touched me. im positive something tapped my leg. now the thing is my nephews house is 20 feet or less away from an electrical tower. and another thing that might answer this is i had a hernia surgery years before which means that the metal plate might have something to do with this. and this has happened twice. but i was so sketched out from a psychosis and paranoia that i was completely zoned out some where. but do you believe in something like this?

2007-03-20 15:47:58 · 1 answers · asked by Anonymous

2007-03-20 15:42:40 · 5 answers · asked by Anonymous

This is a phyics question having to due with conservation of momentum and kinetic energy. Can you justify your anwser y it is better one way or another!

2007-03-20 15:36:36 · 3 answers · asked by chowee21 2

i heard someone say they could hear a very faint buzzing coming from them, is it true?

2007-03-20 15:27:24 · 8 answers · asked by 22 4

Find the force when the current is 65A if the force varies directly as the current.

2007-03-20 15:23:59 · 2 answers · asked by givemelust_flash 2

I keep noticing this and want the optical illusion explained.
i know the land is flat-no major hills or mountains, so it is an illusion.

2007-03-20 15:14:05 · 2 answers · asked by BonesofaTeacher 7

A uniform rod of length 0.86 m and mass 11.5 kg is balanced on a sharp edge at 0.58 m from the left end. At the left end hangs a mass of 35.0 kg and the right end hangs an unknown mass so that the whole assembly is in equilibrium. Calculate the torque on the center of mass of the rod alone with respect to the pivot point.

2007-03-20 15:10:49 · 1 answers · asked by Supa Fly 1

Abstract: A statistically significant set of results from tossing slices of buttered bread on to a dirty floor seems to confirm the validity of Murphy's law.

Physicists working with a large-scale toaster and butterknife apparatus at Purdue University have observed a statistically significant above-expectation proportion of random buttered toast tosses in which the toast landed with the buttered side down. The research team hypothesizes that the distribution of butter side up and butter side down toast tosses indicates that Murphy's law is a quantifiable natural law.

Also, four of the six members of the research team slipped and fell down on their way out of the laborabory following the experiment.

2007-03-20 15:06:36 · 3 answers · asked by Anonymous

The motion of a particle moving in a circle in the x-y plane is described by the equation: Theta = omega * time
where Theta is the polar angle measured counter-clockwise from the + x-axis in radians, and r is the distance from the origin in m.

Given that r = 2.20
and
Theta = 5.84 * t

Calculate the x-coordinate of the particle (don't forget the appropriate units) at the time 3.70 s.
REMEMBER, the radius vector of the particle is a 2-dimensional vector lying in the xy plane. See Chapter 3 for determining the x and y components of a vector if you have forgotten. Theta is in radians so set your calculator correctly before computing the sine or cosine component of the angle in getting the x or y coordinate of the particle as asked.

Hint: The particle moves in a circle. Since R is constant, find theta at the time given, and use trigonometry to get the coordinate required.

2007-03-20 14:55:27 · 2 answers · asked by Supa Fly 1

Most of you are probably thinking I'm just getting answers... I'm not and I'm practicing for an exam and I have no idea what's going on. My professor is not helping nor are the tutors and my classmates are actually in the same situation as me... I need help with this problem... (I honestly have 3 questions posted here because no one wants to help and everyone has helped me get a B+ on my last exam thanks). Please help me I'm desperate.

A circular conducting coil with radius 2.55 cm is placed in a uniform magnetic field of 0.858 T with the plane of the coil perpendicular to the magnetic field. The coil is rotated 180° about the axis in 0.222 s. (a) What is the average induced emf in the coil during this rotation? (b) If the coil is made of copper (ρ = 1.67 10−8 Ω·m) with a diameter of 0.900 mm, what is the average current that flows through the coil during the rotation?

2007-03-20 14:41:48 · 2 answers · asked by Sir Guitarist 2

A transformer with 2600 turns on the primary and 330 turns on the secondary is used in an electric slot car racing set to reduce the input voltage amplitude of 170 V from the wall output. The current in the secondary coil is of amplitude 1.6 A. What is the voltage amplitude across the secondary coil and the current amplitude in the primary coil?

Please help me with this... physics has been beating me the whole semester

2007-03-20 14:37:50 · 2 answers · asked by Sir Guitarist 2

2007-03-20 14:34:45 · 4 answers · asked by youdontneedtoknowmyname. 2

This has me stuck:

If a coil with an area of 100 centimeters cubed containing 500 turns of a copper wire with a resistance of .3 Ohms is compressed to 1.0 centimeters cubed in 10 ms, find the voltage produced and the current flow.

Thanks for the help!

2007-03-20 14:28:02 · 1 answers · asked by Kratos 2