Physics - October 2006

A person opens a door by applying a 15N force to the door at a distance .90m from the hinges. The door opens 120 degree in 2.0s. How much work was done?

2006-10-19 11:38:47 · 2 answers · asked by lubna h 1

A constant torque of 10m-N is applied to a 10kg uniform disk of radius .20m. What is the angular speed of the disk after it rotates 2.0 revolutions from rest?

2006-10-19 11:36:34 · 2 answers · asked by lubna h 1

A 35kg child sits on a uniform seesaw of negligible mass, 2.0m from the fulcrum/pivot point. Another child (30kg) must sit how far form the fulcrum for the seesaw to be in equlibrium?

2006-10-19 11:33:43 · 3 answers · asked by lubna h 1

Infrared waves are supposed to be invisible to the unaided eye, but I've found various websites online that refer to "infrared light." I'm slightly confused.

2006-10-19 11:29:42 · 4 answers · asked by Lynn 1

I have to convert 58 nanoseconds into seconds.

2006-10-19 11:18:14 · 7 answers · asked by Tori H 1

A 7kg object hangs at one end of a rope that is attached to a support on a railroad boxcar. When the car acelerates to the right, the rope makes and angle of 37 degrees with the vertical. The acceleration of gravity is 9.8 m/s2. Find the acceleration of the car.

2006-10-19 11:10:40 · 1 answers · asked by Anonymous

Is is possible to produce or hear messages or broadcast with different frequencies of micro, infared, gamma, ultraviolet, or x-rays? What would be an average range for those frequencies? And if not, what makes radio waves so special?

2006-10-19 10:29:36 · 7 answers · asked by michaelazerrad 1

i had to do a lab report with horizontal / vertical motions - projectile.... you know make a ramp throw a ball and predict where it's going to hit and place a can that place....
I'm working on my lab report, and I'm not getting this question:
3. Your probably noticed the range of the ball increased in direct porportion to the speed at which it left the ramp. The speed depends on the release point of the ball on the ramp. WHAT ROLE DO YOU THINK air resistance** HAD IN THIS EXPERIMENT?

what the hell does that mean?

and.. no i'm not going to say don't be rude w/ negative comments... b/c it's simple if you don't want to answer or if its not worth a minute of your time .... DO US ALL A FAVOR AND CLICK OUT OF THIS QUESTION.... Gracias!

2006-10-19 10:21:18 · 5 answers · asked by Sheyna 1

let's say it says: v(lowercase x) or t and a tiny 1 or 2 or 3 at the end of it.... how would i make these letters/ numbers smaller like that in word?

2006-10-19 09:59:44 · 6 answers · asked by Sheyna 1

i need a quick answer..u get quick points..

2006-10-19 09:52:49 · 7 answers · asked by Anonymous

Is the sense of touch imaginary? If you keep cutting the distance between two objects in half, they'd never touch...SO, how do we touch things??

2006-10-19 09:46:35 · 11 answers · asked by photoshoot03101 1

I volunteered to help out at a science festival thing at an elementary school, but the topics are all physics-related, so I have no idea what they are:
1. standing waves (demo:slinky)
2. resonance (demo:tuning fork, Chinese spouting bowl)
3. energy conversion (demo:metal balls you strike on paper to burn a little hole, name?)
4. temperature (demo:polarized light crystal sheet)

Give me a little background (easily understood, I don't really want to know too many physics terms) on each, and how to explain it to little kids... Thanks! :)

2006-10-19 08:54:25 · 5 answers · asked by nice guys finish last 2

A Car with four wheel drive has mass m=1000 kg. Its weight is evenly distributed among the four wheels, whose coefficient of static friction with the road =0.80. If the car starts from rest and the road is horizontal calculate the maximum acceleration it can attain without spinning its wheels?

2006-10-19 08:45:03 · 3 answers · asked by activegirl 1

The cannonball has a speed of 133 m/s after it left the barrel. The cannon carriage is on a flat platform and is free to roll horizontally.
What is the speed of the cannon just after it was fired in units of m/s?

Assume the same explosive charge is used and the total energy of the cannon plus the cannonball system remains the same. Disregard friction. How much FASTER would the ball travel if the cannon was mounted rigidly but all other parameters were the same (in units of m/s)?

2006-10-19 08:32:03 · 4 answers · asked by Dee 4

2006-10-19 08:24:55 · 7 answers · asked by mingo3doh 1

2006-10-19 08:21:50 · 22 answers · asked by j d 1

An unmarked police car, traveling a constant 87.0 km/hr, is passed by a speeder traveling 151 km/hr. Precisely 1.44 s after the speeder passes, the policeman steps on the accelerator. If the police car's acceleration is 2.08 m/s2, how much time elapses after the police car is passed until it overtakes the speeder (assumed moving at constant speed)?

How would you solve this problem?

2006-10-19 08:19:00 · 4 answers · asked by beautyqueenjustine 3

2006-10-19 07:47:18 · 8 answers · asked by eantaelor 4

Two masses M and m are connected by a spring of spring constant k and are placed on a frictionless horizontal surface. Initially the spring is stretched through a distance x when the system is released from rest. Find the distance moved by the two masses before they come to rest.

2006-10-19 07:19:35 · 1 answers · asked by Anonymous

It must shield a permenate magnet and the magnet can not be attracted to that material. It needs to shield a permanent magnet not an EMF.

2006-10-19 07:08:26 · 3 answers · asked by Jack P 1

if the acceleration of a body is zero, are no forces acting on it?

2006-10-19 07:06:06 · 9 answers · asked by Anonymous

2006-10-19 06:38:14 · 2 answers · asked by Anonymous

2006-10-19 06:37:37 · 4 answers · asked by Anonymous

2006-10-19 06:36:52 · 6 answers · asked by Anonymous

As opposed to say, two-, four- or five- or more-dimensional?

2006-10-19 06:34:30 · 8 answers · asked by Anonymous

PROBLEM #1:
What determines wheter an object at a given time is net absorber or net emitter?

PROBLEM #2:
Why is important that your finger be wet if you intend to touch it briefly to a hot clothes iron to test its temperature?

Please indicate which answer is for what question while answering.

2006-10-19 06:17:40 · 1 answers · asked by Gordito 1

is fired into a 122 g block of wood which is at rest on a horizontal surface and stays in the wood. After the impact, the block slides 14 m and then comes to rest. If the coefficient of friction between the surface and the block is 0.5, what is the speed of the bullet before impact. Acceleration of gravity is 9.8 m/s^2, answer in units of m/s.

2006-10-19 06:11:49 · 1 answers · asked by Mariska 2

a stone hangs by a fine thread from the ceiling and a section of the same thread dangles from the bottom of the stone. If a person gives a sharp pull on the dangling thread, where is the thread likely to break: below the stone or above it? What if the person gives a slow and steady pull, please exapain this

2006-10-19 06:05:04 · 3 answers · asked by Anonymous

Hi,
I can't find a decent, easy-to-read (and understand) website which will thoroughly explain most of the advantages and disadvantages of mobile phone masts. So I decided that maybe some of you clever people could help me! You can either:
a) Give me a good link to a page about the advantages and dasadvantages of mobile phone masts;

OR:-

b) You could type them in your answer to me if you know a few good ones already.

Thanks v. v. v. much in advance! :D

2006-10-19 05:35:31 · 3 answers · asked by ..Hannah..UK Never too early to celebrate Xmas 6

2006-10-19 05:01:06 · 3 answers · asked by Megan T 1