Physics - January 2007

2007-01-28 09:27:07 · 4 answers · asked by Baybee Bonkerz...x 1

Such as when it is bent by matter?

2007-01-28 09:06:38 · 15 answers · asked by Source 4

2007-01-28 09:03:28 · 4 answers · asked by Anonymous

A metal sphere has a charge of +8.0 mC. What is the net charge after 6.0 x10^13 electrons have been placed on it?

I was mainly wondering if the sign on the charge of electrons has to be negative since electrons correspond to negative charge.


Also, any help checking my process of solving the equation would be appreciated:
I used the equation q=Ne to find the charge of the electrons in Coloumbs, where e= 1.60 x10^-19 and N equals the number of electrons. Then I converted the 8.0 mC to Coloumbs and added the two together. My answer was 1.76 x 10^-6 C, but would be different if the charge on the electrons was negative.

Thanks!

2007-01-28 08:42:41 · 2 answers · asked by Anonymous

Rosa and Jon were asked by their physical

science teacher to determine the speed of

sound. While walking to their dormitories af-

ter class, Jon clapped his hands, which Rosa

and Jon heard a moment later as an echo. The

echo bounced o® a building that was 250 ft

away. They knew that they could not mea-

sure the brief time for a single clap to return,

so they had a brillant idea. Jon clapped and

then started to clap as soon as he heard the

echo, and he then continued this synchronized

clapping so that Rosa could measure the fre-

quency. Rosa counted 71 of Jon's claps in one

half minute.

What is the frequency of Jon's clapping?

Answer in units of Hz.

2007-01-28 08:38:07 · 2 answers · asked by Anonymous

So, for science class, we have to make a flip-book, showing movement. For mine, I am showing how a person breathes to sing. Showing how their stomach starts flat, then takes in air, then quickly lets the air out to produce proper vocal sound. Is this a good idea? Other kids are just showing like a bug moving across the floor.

2007-01-28 08:29:17 · 2 answers · asked by Addicted To Abercrombie & Fitch 2

This question adds onto the one I asked a while ago, which was (How can I make an electromagnet strong enough to lift a fridge?)

2007-01-28 08:25:59 · 5 answers · asked by brandon c 1

A constant net force of 410 N is applied upward to a stone that weighs 32 N. The upward force is applied through a distance of 2.0 m, and the stone is then released. To what height, from the point of release, will the stone rise?

Please help me with this problem.
I'm having trouble solving it.

2007-01-28 08:20:22 · 2 answers · asked by swimmertommy 1

a worker on a building site raises a bucket full of cement at a slow steady speed, using a pulley. the weight of the bucket is 200 N. the force which worker produces is 210 N. the bucket is raised through a height of 4m.
-through what distance does the worker pull the rope?
-how much work is done on the bucket and cement?
-how much work is done by the worker?
-where does the energy used by the worker come from?

2007-01-28 08:19:52 · 2 answers · asked by minche 1

2007-01-28 08:01:23 · 7 answers · asked by james s 1

The boiling point of ethyl alcohol is 78.3 C,the heat of vaporization is 855 joules/gm.?
find the dp/dt at the boiling point.

2007-01-28 07:46:37 · 1 answers · asked by joy 1

A constant net force of 410 N is applied upward to a stone that weighs 32 N. The upward force is applied through a distance of 2.0 m, and the stone is then released. To what height, from the point of release, will the stone rise?

Please help me with this problem.
I'm having trouble solving it.

2007-01-28 07:17:02 · 3 answers · asked by swimmertommy 1

2007-01-28 07:01:43 · 13 answers · asked by andygames07 3

If soft iron is a very poor material for permenant magnets, why is it when the same material is oxidised into ferrite dust it can be sprinkled on to cellotape where it performs well as a permenant magnet for storing intelligence, similar to casset tape, and depite being coiled does not lose its permabillity, I have been playing around with magnets for fifty years, and have more questions than answers

2007-01-28 06:54:11 · 1 answers · asked by Anonymous

5. A 0.9 kg rock slides horizontally off a table
from a height of 1.4 m. The speed of the rock
as it leaves the thrower's hand at the edge of
the table is 1.7 m/s, as shown.
The acceleration of gravity is 9.81 m/s^2 :
How much time does it take the rock to
travel from the edge of the table to the floor?
Answer in units of s.
part2
What is the kinetic energy of the rock just
before it hits the floor? Answer in units of J.

2007-01-28 06:53:32 · 5 answers · asked by kavita 1

2007-01-28 06:36:11 · 1 answers · asked by Anonymous

for example: if the cold water is at 4 degrees C and you need to cool 200l of water at 80.C down to 40 degrees C (where the hell is the degree symbol on the keyboard!).Is there a formulae for this which would work at any temperature differential and volume?

2007-01-28 06:25:07 · 10 answers · asked by jumbo remote 2

I am really bad at conversions after being out of
school for a very long time. Can someone show
me step by step the best way to deal with conversions
in general. This is a little different than the previous
question I had.


What is the mass, in grams, of 120 mL od liquid
with a density of 1.8 g/mL?

2007-01-28 06:03:44 · 6 answers · asked by shelliemarie_c 2

If you have to build a bridge, which can only be perpendicular to the river banks, where would you build it in order to make the shortest path from point 1 on one side to point 2 on the other? Points 1 & 2 can be anywhere on each respective side.

2007-01-28 06:02:39 · 1 answers · asked by Anonymous

I need help understanding how to work these types of problems out. Can someone help?

2007-01-28 05:51:44 · 4 answers · asked by flower67 1

like a picture or something like that

2007-01-28 05:50:01 · 3 answers · asked by Anonymous

A car moves along an x axis through a distance of 980 m, starting at rest (at x = 0) and ending at rest (at x = 980 m). Through the first 1/4 of that distance, its acceleration is +5.25 m/s2. Through the next 3/4 of that distance, its acceleration is -1.75 m/s2. What are (a) its travel time through the 980 m and (b) its maximum speed?

2007-01-28 05:49:48 · 1 answers · asked by Anonymous

A world's land speed record was set by Colonel John P. Stapp when in March 1954 he rode a rocket-propelled sled that moved along a track at 1020 km/h. He and the sled were brought to a stop in 1.4 s. In g units, what magnitude acceleration did he experience while stopping?

2007-01-28 05:48:49 · 1 answers · asked by Anonymous

On a dry road, a car with good tires may be able to brake with a constant deceleration of 3.65 m/s2. (a) How long does such a car, initially traveling at 26.3 m/s, take to stop? (b) How far does it travel in this time?

2007-01-28 05:47:48 · 4 answers · asked by Anonymous

I have yet to take physics in highschool (will next year...) but a good friend of mine told me that the Big Bang Theory defies the laws of physics, such as energy/ matter cannot be created or destroyed so how would the BBT be possible, also something about how everything tends to dissorder, so why would the world create an ordered world, then go back to tending to dissorder??? Just wondering if this is true, and what everyone else thinks...

2007-01-28 05:38:45 · 5 answers · asked by werdsoccer11 2

2007-01-28 05:32:27 · 1 answers · asked by Anonymous

Styrofoam has a density of 300 kg/m^3. What is the maximum mass that can hang without sinking from a 40-cm diameter styrofoam sphere in water? Assume the volume of the mass is neglible to that of the sphere.

I've tried using the formula: density = m/V... but got nowhere with it... please help.

2007-01-28 05:26:36 · 1 answers · asked by yaochiemchao 1

2007-01-28 05:21:52 · 2 answers · asked by another</3'dgirl 1

2007-01-28 05:08:27 · 6 answers · asked by tico 1

I'm not experimenting this, but I just need to know how many batteries I need or how many wraps of wire I need.

2007-01-28 05:05:58 · 3 answers · asked by brandon c 1