Physics - December 2007

2007-12-02 03:57:52 · 6 answers · asked by Anonymous

If 2 metal balls each have a charge of -10^-6 C and the repulsive force between them is 1 N, how far apart are they?

2007-12-02 03:56:06 · 2 answers · asked by Anonymous

A puck of mass 86.7 g and radius 3.73 cm slides along an air table at a speed of v = 1.53 m/s. It makes a glancing collision with a second puck of radius 5.12 cm and mass 120 g (initially at rest) such that their rims just touch. The pucks stick together and spin after the collision

2007-12-02 03:49:59 · 1 answers · asked by c c 2

not fiber glass but plain glass..

2007-12-02 03:39:48 · 0 answers · asked by Anonymous

The hydraulic oil in a car lift has a density of 8.30 102 kg/m3. The weight of the input piston is negligible. The radii of the input piston and output plunger are 7.60 10-3 m and 0.125 m, respectively. What input force F is needed to support the 27000 N combined weight of a car and the output plunger under the following conditions?

(a) The bottom surfaces of the piston and plunger are at the same level.


(b) The bottom surface of the output plunger is 1.10 m above that of the input piston.

2007-12-02 03:25:33 · 1 answers · asked by yummy_girlscout 1

using a spring balance with a cord, ring stand or vertical rod, dowel with screw eye.

if an angle, let say A is smaller than angle B, what will happen to the tension in the cable.

2007-12-02 03:23:03 · 2 answers · asked by peipei91189 1

A source emits sound waves isotropically. The intensity of the waves 3.37 m from the source is 2.39 × 10-4 W/m2. Assuming that the energy of the waves is conserved, find the power of the source.

2007-12-02 03:11:34 · 2 answers · asked by Anonymous

Scientists have been able to slow light down to speeds of less then 40 miles per hour, are there any applications of this regarding the theory of relativity? Would this cause the atoms to travel forward in time?

Sorry if my wording is a little ambiguous, I'm having trouble articulating the question.

2007-12-02 02:45:51 · 8 answers · asked by pythagoras 2

2007-12-02 02:38:13 · 1 answers · asked by Anonymous

A superball of mass 0.05 kg is dropped from a height of 10 cm above a table top. It bounces off the table and rises to the same height.
a. If the superball was in contact with the table for 30 ms, calculate the averge force exerted on the ball by the table.

2007-12-02 02:17:20 · 2 answers · asked by Bubbles76 1

2007-12-02 02:12:52 · 1 answers · asked by knowledge hunter 1

what's the equations he used?
how is it used today, in math and science?

2007-12-02 01:49:37 · 4 answers · asked by A Shaker, But Not A Mover. 4

The temperature at which steel melts is too high for either jet fuel or office fires to reach. So, given that the towers could not have come down without some kind of "help", and given that eyewitnesses and news crews kept talking about "secondary explosions", then what do you think this will mean for you?

Will it change you stance on anything else?

Now, what if I told you that WTC building 7 also fell down on 9/11 at roughly 5:30pm. It was not hit by any plane. It was not hit by any major debris. It had only small fires that the sprinklers should have deal with fine. It fell straight down at free fall speed, yet it was asymmetrically built.

What if I told you that crews of men were scheduled to do network "rewiring" in the World Trade Center buildings in the weeks before 9/11. They were seen going in with backpacks and cable spools.

Put on your thinking cap!

2007-12-02 01:44:30 · 14 answers · asked by VarArb 1

A 21.6 Kg box initially at rest is pushed 6.63 m along a rough, horizontal floor with a constant applied horizontal force of 101.86 N. The acceleration of gravity is 9.8 m/s^2. The coefficient of friction between box and floor is 0.399.

1.) Find the work done by the applied. Answer in units J
2.) Find the work done by the friction. Answer in units of J
3.) Find the change in Kinetic energy of the box. Answer in J
4.) Find the final speed of the box. Answer in units if m/s

2007-12-02 01:40:03 · 2 answers · asked by Anonymous

My question is why light must bend when it goes from one medium to another. Say if it goes from air to water. Water is optically denser than air, which means that water slows down light more than air does. So why doesn't the light just slow down in water, why does it have to bend in the process?

2007-12-02 01:23:01 · 5 answers · asked by Ebony 1

I know this has something to do with mechanical resonance and natural frequency, but I'm not sure how it works.

2007-12-02 01:10:45 · 1 answers · asked by Cathy 2

when we see the colour black we are seeing the light that it reflects not its actual colour
what is the actual colour ?

2007-12-02 00:50:44 · 5 answers · asked by Anonymous

please provide tips and important details for building a working FM transmitter, and how it works, thank you.

2007-12-01 23:56:21 · 3 answers · asked by kendrickcbk 2

http://chibiakemi.deviantart.com/art/Falling-Off-the-Planet-30992778

2007-12-01 23:15:27 · 2 answers · asked by fuzzy_emo_cornflake 1

what is the acceleration of an electron me=9.11x10 -31 kg in a uniform electric field of 2 x 10 4 n/c?

2007-12-01 19:58:35 · 1 answers · asked by cha 2

2007-12-01 19:47:35 · 7 answers · asked by checked.cherry 2

2007-12-01 19:43:52 · 5 answers · asked by angels19jesus09 2

According to the Big Bang model, all of the 12C in the universe was made in stars. One process that occurs in older stars is the triple-alpha process in which three alpha particles are turned into 12C. The mass of an alpha particle (an alpha particle is a 4He nucleus) is 6.646477E-27 kg. The mass of 12C is 19.926464E-27 kg. How much energy is released in the triple-alpha process? Give your answer both in pJ and in MeV.

??pJ

??MeV

2007-12-01 18:33:09 · 1 answers · asked by Anonymous

I hate being that person posting homework question but my textbook is a joke and I can't figure it out.

2007-12-01 18:28:32 · 1 answers · asked by Lucy 2

I was bored, sitting here on a Saturday night, and i decided to place my hand over this small fan i have here on my desk. It did not satisfy me, so i placed a sheet of paper over it. To my surprise, it hovered for a fraction of a second before fluttering away, to my annoyance, into a dusty corner of my room. Therefore, i decided, using some sewing string, a needle, and tape (to hold the string to the needle [SO much less work]) to create a parachute out of the paper with which id tie over the fan on the little rungs so that said parachute would float and i could enjoy many lulz. Unfortunately, it failed and landed, with a sad plop, on my desk. I do not fully understand why this is so. Not all the strings are exactly the same length, and i am using a rectangular sheet of normal printing paper. The fan is strong enough to hold everything in the air; everything just seems to shift to some random direction and lose the lift of the fan. Explanation and ways to fix/re-create my parachute.

2007-12-01 17:03:53 · 2 answers · asked by Arminhammer 2

A convex mirror in an amusement park has a radius of curvature of 3.00 m. A man stands in front of the mirror so that his image is half as tall as his actual height. At what distance must the man focus his eyes in order to see his image?

2007-12-01 15:50:34 · 1 answers · asked by Abc 3

Suppose the earth still goes around the sun every year but you keep one side of the earth always facing the sun, so one side always sees the sun and the other side never sees it. As seen from the earth, the sun is stationary in the sky. Now in this supposed situation the stars would:

a) also seem stationary in the sky.

b) would seem to go once around the earth every day.

c) would seem to go once around the earth every year.

2007-12-01 15:28:02 · 2 answers · asked by ? 6

Two 78.0 kg hockey players skating at 6.25 m/s collide and stick together.

If the angle between their initial directions was 130 degrees, what is their speed after the collision?

I'm using momentum=mass times velocity.
also,
How does the 130 degrees come into play?

2007-12-01 14:45:32 · 1 answers · asked by revernance 3

Lewis structure for IF2-??

can't figure out what this should be.

I Got F----I----F

First F has 6 Dots, The I has 4 Dots, and the last F has 6 dots
I know Its linear

ALSO...

If you don't mind can you help me with IBr4-???
I Know its Square Planar

2007-12-01 14:45:25 · 1 answers · asked by FANTASY 2

2007-12-01 14:11:12 · 0 answers · asked by Anonymous