Physics - October 2007

2007-10-21 04:25:10 · 5 answers · asked by Anonymous

2007-10-21 04:11:19 · 11 answers · asked by nany_30200 1

Four 1kg bodies are placed at 4 edges of a rectangle of side 4cm and 3cm.What is the potential energy of the system?

2007-10-21 03:55:30 · 1 answers · asked by Anonymous

You have already explained Einstien explanation on why we cannot travel faster than the speed of light and while I dont really understand it I accept that what you say as gospel. My question is,If I can see a star that exploded whatever in the early 70s when I was born and sience made it possible for me to instantly transport my self to that location and then instantly transport myself back , would I arrive back in the early 70s and if not why not?

2007-10-21 03:20:57 · 5 answers · asked by Anonymous

I'm not really sure what this is, can someone help me?

2007-10-21 03:20:41 · 2 answers · asked by Anonymous

which is refelected and which are refracted i keep getting them wrong i dont understand??

The red color of an apple.


An object underwater looks closer than it is.


An image in a mirror.

A rainbow

In a makeup mirror your face looks enlarged.

Why glasses or contacts improve vision.

2007-10-21 02:31:09 · 6 answers · asked by molly 1

2007-10-21 02:28:50 · 2 answers · asked by red_devil07 2

2007-10-21 02:24:50 · 2 answers · asked by ian 1

According to my friend, as the frequencys of 2 connected systems come closer together, the amplitude of their osccilations would tend to infinity. We tried to come up with a real example -

If I stood on the end of a diving board and bounced up and down, then at the same time swung around a brick on a piece of rope, in such a way that the oscilations of each system matched, would I theoretically be flung into space?

2007-10-21 02:15:13 · 4 answers · asked by none 2

Give as many reasons as you can. ;D

2007-10-21 02:06:54 · 3 answers · asked by elvesrattackingme 2

i remember reading somewhere that it was impossible for hmans to build a device that could travel at the speed of light but i cant remember why. can anyone please explain?

2007-10-21 01:55:18 · 7 answers · asked by Anonymous

Hey, i don't get either of these questions, if someone could help me I'd really appreciate it!

[this ones a pulley system problem...]
The weight of a block on a table is 422N and the weight of the block hanging is 185N. Ignoring all frictional effects and assuming the pulley to be massless, find
a) the acceleration of the two blocks
b) the tension in the cord

A 95kg person stands on a scale in an elevator
What is the apparent weight when the elevator is
a) accelerating upward with an acceleration of 1.8 m/s^2
b) moving upward at a constant speed
c) accelerating downward with an acceleration of 1.3m/s^2

thanks!

2007-10-21 01:44:07 · 3 answers · asked by Melissa S 1

If you took a large, hollow ball and lined the inside of it with mirrors, placed some neat flash light with a video camera in the middle of it-what exactly would you see?

2007-10-20 22:39:48 · 4 answers · asked by Buckminster 1

2007-10-20 22:22:16 · 14 answers · asked by Anonymous

the crate moves with it, not sliding on the bed of the truck. in what direction is the friction force exerted by the bed of the truck on the crate?
is the answer there is no friction because the crate is not sliding?

2007-10-20 21:22:17 · 4 answers · asked by student 1

2007-10-20 20:52:48 · 5 answers · asked by student 1

The standard unit for mass is kilo
The standard unit for weight is Newton or kg.m/s2
Mass is not affected by the change of location of the object while weight is being affected due to change in gravitational pull.

2007-10-20 20:29:49 · 2 answers · asked by janace25 1

A boat of mass 250 kg is coasting, with its engine in neutral, through the water at speed 3.00 m/s when it starts to rain. The rain is falling vertically, and it accumulates in the boat at the rate of 10.0 kg/hr.

The drag is proportional to the square of the speed of the boat, in the form F_d= 0.5 v^2. What is the acceleration of the boat just after the rain starts? Take the positive x axis along the direction of motion.
Express your answer in meters per second per second.

2007-10-20 20:28:13 · 1 answers · asked by Komodork 3

Louise is riding in a roller coaster. Louise experiences a downward acceleration of 25.0 m/s2 at the top of the loop and an upward acceleration of 30.0 m/s2 at the bottom of the loop. Use Newton’s second law to determine the normal force acting upon Louise’s 1000 kg roller coaster car

2007-10-20 19:51:13 · 1 answers · asked by help 2

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.21 and the push imparts an initial speed of 4.0 m/s?

2007-10-20 18:52:00 · 2 answers · asked by Albert treeter 2

i have a school project and i have to do a 3d project for that make up of sulfur .....any suggestions will help

2007-10-20 18:08:00 · 10 answers · asked by pickle 1

2007-10-20 17:52:07 · 7 answers · asked by Anonymous

The coefficient of static friction between hard rubber and normal street pavement is about 0.7. On how steep a hill (maximum angle) can you leave a car parked?

2007-10-20 17:46:09 · 4 answers · asked by Albert treeter 2

I Mean The MEG.
Wasn't It Supposed To Be on The Market in 2003?

2007-10-20 17:37:06 · 3 answers · asked by engelfeurs 2

In my exercise booklet it sometimes says acceleration equals m/s^2 and sometimes = m/s, and the same with velocity...

so how do i know which one is for which?

2007-10-20 17:36:36 · 2 answers · asked by LovingAngelsInstead 2

2007-10-20 17:36:00 · 3 answers · asked by Tango 1

Reason asking wanted to try to make a ping pong table with the top being make out of plexiglass.

2007-10-20 17:35:43 · 2 answers · asked by jdawg 1

2007-10-20 17:33:21 · 3 answers · asked by R E 2

find the resultant of each pair of forces
-forces of 7N east and and 12N north

(the answer to this was 13.9 N, N30°E... but i dont know how to get this answer)

2007-10-20 16:49:32 · 3 answers · asked by internet nickname 1

Why don't they make it so that I has two horizontal lines one on top and the other on bottom?

2007-10-20 15:40:01 · 3 answers · asked by Anonymous