Physics - June 2007

Explain how each is involved in the heating of the earths atomosphere

2007-06-03 10:41:20 · 3 answers · asked by Anonymous

a) opposite to the direction of motion
b) in the direction of motion
c) upward
d) downward
e) zero

2007-06-03 10:33:45 · 3 answers · asked by heyy ya 1

I am stuck on this problem and would be really greatful with any help on it. I got part A, but cannot figure out part B.

An electric car is designed to run off a bank of 12.0 V batteries with a total energy storage of 1.90 x 10^7 J.

a) If the electric motor draws 6.00 kW, what is the current delivered to the motor (in A)? I know that this is 500 A.

b) If the electric motor draws 6.00 kW as the car moves at a steady speed of 20.0 m/s, how far will the car travel before it is out of juice (in km)?

2007-06-03 09:52:17 · 3 answers · asked by Anonymous

just wondering....

2007-06-03 09:35:24 · 8 answers · asked by kenneth s 1

I just watched 'The Illusionist' last night and wondered about holograms. I have been fascinated with them since seeing Luke Skywalker with the distress holo of Leia and now 'The Illusionist'. Is it possible to create your own? Like a full figure human like in the 'The Illusionist'?

2007-06-03 09:27:41 · 4 answers · asked by Anonymous

2007-06-03 09:21:35 · 2 answers · asked by smiles 1

I cannot understand this problem. Please help me :( I would appreciate it a lot. Thank you much.

In the model of the hydrogen atom, an electron in the lowest energy state moves at a speed of 2.17 x 10^6 m/s in a circular path having a radius of 5.34 x 10^-11 m. What is the effective current associated with the orbiting electron (in mA)?

I know that R = V/I, but I don't have anything to work with :(

2007-06-03 09:15:15 · 2 answers · asked by Hotaru 1

The center of the smaller hole is .8R from the center of the larger circle. [hint: use subtraction]

2007-06-03 09:06:52 · 3 answers · asked by yo yo ma 2

2007-06-03 09:06:28 · 2 answers · asked by Anonymous

if i travel the speed that a bullet comes out of a gun and fire it. would the bullet double the speed or stay at the speed as me?

2007-06-03 09:03:53 · 6 answers · asked by Anonymous

I heard you can drop a cat from any height and it will survive, because its terminal velocity is lower than the speed at which it can hit the ground unhurt. Can anybody confirm or refute this, because it can't be true, or can it?

2007-06-03 08:53:34 · 7 answers · asked by Michael G 2

I'm studying for my high school physics exam, so please answer in that regard. Also, if you could explain how the answers relate that would be cool.

2007-06-03 08:27:53 · 3 answers · asked by chronic-what-cles of narnia 2

How do you calculate the kinetic and potential energy of an gravitational pendulum?

2007-06-03 08:06:38 · 2 answers · asked by t_mann 2

2007-06-03 07:31:43 · 3 answers · asked by pkanand 1

A car is moving on a straght road with velocity v, the total opposing force is f, what is the product of f times v

2007-06-03 06:03:13 · 4 answers · asked by Anonymous

I was going over my study sheet, and i need help with one thing i cant seep to find: "Describe how gravity affects satellite motion and planetary motion" i looked in my book and online.....will you help me?

2007-06-03 06:01:29 · 4 answers · asked by Stephanie C 1

Does anybody know,

The type of energy produced by photosynthesis?

------- defined as work or the capacity to do work

A form of energy used in thee industry and in the home'

energy can be`_______ into different forms

the mass of a object

The energy of matter in motion?


THANKS

2007-06-03 05:34:34 · 2 answers · asked by Anonymous

It is common knowledge and obvious from observation that this is always the case but where does the physical reason lie? - in terms of contact, angular momentum etc.?

Would it also be the case with collisions involving non-spherical objects? - eg. a cube and a plane surface.

2007-06-03 05:33:51 · 3 answers · asked by Andrew H 2

2007-06-03 05:15:50 · 3 answers · asked by jaime amito 1

2007-06-03 05:13:21 · 13 answers · asked by Anonymous

2007-06-03 05:12:44 · 2 answers · asked by Anonymous

============.
From Neil Turok article:
We also know that, in the universe today, there's something
called "dark energy." Dark energy is the energy of empty space.
I cannot understand this.
Please, before to answer, read this article.
------------.
THE CYCLIC UNIVERSE [5.17.07]
A Talk With Neil Turok

NEIL TUROK holds the Chair of Mathematical Physics in the department of
applied mathematics and theoretical physics at Cambridge University. He
is coauthor, with Paul Steinhardt, of Endless Universe: Beyond the
Big Bang.
NEIL TUROK's Edge Bio Page
THE CYCLIC UNIVERSE
http://tech.groups.yahoo.com/group/quantum_theory/message/5255

==========================.
http://www.socratus.com

2007-06-03 04:03:58 · 5 answers · asked by socratus 2

A rifle is used to shoot twice at a target, using identical cartridges. The first time, the rifle is aimed parallel to the ground and directly at the center of the bull's eye. The bullet strikes the target at a distance of HA below the center, however. The second time, the rifle is similarly aimed, but from 4.5 times the distance from the target. This time the bullet strikes the target a distance of HB below the center. Find the ratio of HB/HA.
HB/HA

When solving this problem I started out by working with the Ha part first and found the variables. X-R Vx-V y=Ha Voy a=-9.80m/s^2 t=?

Hb X=4.5R Vx=V Voy=0 a=-9.80 y=? t=?

Then i solved for time for Ha and for Hb
Time Ha=R/V
Time Hb=4.5R/V

then I used the kinematic equation and plugged in time for Ha and Hb

I ended up with 1/2*(9.80m/s^2)(R/V^2)
& Hb=-4.9m/s^2 (4.5R/V)^2


Im not sure what to do next...I know I need to find the missing variables but I'm not sure how to go about that! Please can you help me.

2007-06-03 03:45:54 · 2 answers · asked by wildcherrychica1 2

I understand that the second law of thermodynamics is ENTROPY which explains that things fall out of order...

my question is WHY????
WHY does it have to be that way? .

2007-06-03 03:21:55 · 6 answers · asked by Anonymous

us the stars we see them & they are light years away the sun is so large compared to earth nwe should be able to see some light if we look right or left can i get afew answers on this
i know the earth cast a shadow but that doesnt account for why we cant see the light going past us i have done a test with a pin head & a torch its clear to me the pin head didnt stop the light pas ing the head of the pin the torch wasnt on ascale as the sun it was much smaller tr it can someone come up with the right answer please

2007-06-03 03:14:26 · 5 answers · asked by Anonymous

In Physics, if I pull up something but it doesn't move, where does the energy go?

2007-06-03 03:04:15 · 4 answers · asked by Anonymous

when a car comes to a stop sign , it runs over a metal plate almost like a scale and the weight of the car spins a generator
the result is enough clean electric to power 4 homes
high traffic areas , could power a huge amount of homes
also faradays machine, even on you tube but usa will not give these people a patent

2007-06-03 01:57:31 · 5 answers · asked by Anonymous

For example how can I find the acceleration that can be caused by the pressure of say, one ton?

2007-06-03 01:56:02 · 6 answers · asked by Jay S 1

In other words does all form of energy, including massless particles like photons, create a gravity field.
If so would it not make it impossible to meausure or discover a graviton as they would have to be completly void of energy?

2007-06-03 01:43:11 · 10 answers · asked by Anonymous

IF 1 TWIN IS PLACED ON A SPACESHIP & TRAVELS NEAR THE SPEED OF LIGHT WHILE THE OTHER TWIN REMAINS EARTHBOUND,THEN WICH OF THE 2 WILL BE OLDER @ THE RETURN OF THE ONE IN THE SPACESHIP. {1 WHO WILL SOLVE THIS WILL B AWARDED NOBEL PRIZE BY ME}

2007-06-03 01:37:05 · 8 answers · asked by saurav 1