Science & Mathematics - 6 November 2006

A turntable with a moment of inertia of 5.1 10-3 kgm2 rotates freely with an angular speed of 33 1/3 rpm. Riding on the rim of the turntable, 15 cm from the center, is a 1.3 g cricket.
_________rpm

2006-11-06 06:26:27 · 1 answers · asked by star043086 1 in Physics

Does the Sun really have 4.5 billion years left or has the sun already expended most of it's energy.

2006-11-06 06:25:49 · 8 answers · asked by LARRY P 3 in Astronomy & Space

a 15 metre board is cut into pieces 3.5
metres long for a bookcase. What is the length of the piece remaining after cutting as many shelves as possible?

2006-11-06 06:24:46 · 7 answers · asked by Anonymous in Mathematics

how many different types of doctors are there and can you name them please?

Thank You

2006-11-06 06:23:55 · 6 answers · asked by Anonymous in Medicine

I've always wondered if our Sun was part of a "Zodiac" or any type of groups of stars. Is there any evidence of this?

2006-11-06 06:20:40 · 10 answers · asked by lilfireyballofhate 3 in Astronomy & Space

Well, ya, I'm having trouble coming up with one

2006-11-06 06:19:35 · 4 answers · asked by Anonymous in Mathematics

2006-11-06 06:17:43 · 6 answers · asked by alvistodd 1 in Mathematics

I'm 42 and I remember when I was 15 a friend had a dollar bill . It looked real!! but it was untearable. Can anyone come up with a name of a tree for that paper?

2006-11-06 06:16:46 · 2 answers · asked by Anonymous in Botany

An object weighing 325 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 265 N. Immersed in oil, the object weighs 295 N.

(a) Find the density of the object.

(b) Find the density of the oil

2006-11-06 06:16:23 · 1 answers · asked by mastersource2005 5 in Physics

2006-11-06 06:15:52 · 4 answers · asked by yankmaggie 1 in Botany

The four tires of an automobile are inflated to a gauge pressure of 2.3 105 Pa. Each tire has an area of 0.027 m2 in contact with the ground. Determine the weight of the automobile.

2006-11-06 06:14:54 · 2 answers · asked by mastersource2005 5 in Physics

2006-11-06 06:14:16 · 6 answers · asked by the fab one(1) 1 in Biology

my sister asked me that this morning.....i was wondering is it possible or would the microwave blow up?

2006-11-06 06:14:05 · 27 answers · asked by wondergal1759 1 in Chemistry

in this case 2 groups of hunters one in forest and one near village. Forest: Avg 7.5 nets, 6.2 hrs/hunt, 4.7 Antelope/hunt
Village: Avg 7.2 nets, 5.6 hrs/hunt, 3.0 Antelope/hunt

How could I combine all three variable for each set to find which group is statistically signifigantly more efficient?

2006-11-06 06:10:37 · 2 answers · asked by firestrike85 2 in Mathematics

2006-11-06 06:07:48 · 2 answers · asked by nivek_spell_it_backwards 1 in Engineering

to the erupting of my volcano?
I am in an elementary education chemistry class and we are making volcanos that can be used in our classrooms someday but for the assignment part I have to turn in a reason as to why these chemicals give off the reaction they do when mixed.

To make my volcano I mixed baking soda, yeast, water and dish soap together and got no reaction, but when i added the peroxide, the reaction rose and gave the erupting effect. I tried leaving out one ingredient each time but the reaction wouldn't work when i did, so i know each ingredient has a purpose. Please help me with this problem! i have been searching for over an hour and still have no idea.

thanks!

2006-11-06 06:02:36 · 4 answers · asked by Aly 1 in Chemistry

Use the following information to calculate the mass lost when 2 moles of hydrogen atoms fuse with 2 neutrons to form 1 mole of helium.

The molar mass of hydrogen 1 over1 H= 1.00782522 g

The molar mass of a neutron 1over0 n= 1.00807134 g

The molar mass of helium 4over2 He= 4.00260361 g

The balanced nuclear reaction is 2 1over1 H+ 2 1over0 n --> 4over2 He + energy




Question B.

According to Einstein's question, conversion of one gram of mass yields 9*10^10kJ of energy. How much energy is released in the above reaction?

I know this is a lot of work but any help I meen any help will be greatly cherished and apretiated

2006-11-06 06:00:49 · 4 answers · asked by cetinnovations 1 in Chemistry

My class were set this and I have no idea how to go about it. We have to show full working too. Surely there's a better way than counting all the way down?

2006-11-06 06:00:42 · 7 answers · asked by mongrel73 1 in Mathematics

2006-11-06 06:00:21 · 6 answers · asked by peterpenrose 1 in Mathematics

I'm sooo stuck. I'd really appreciate a step by step if anyone would be so kind. Thanks in advance.

1. What is the maximum mass of lead that can be obtained by the reaction of 57.33 gramsof PbO and 33.80 grams of PbS?

2. What volume of 1.131M BaCl2 is required to react completely with 42.0 ML of .453 M NA2SO4 ?

3. If 3.00 mol of FeCl3 are ignited in the presence of 2.00 mol of O2 gas how much of which reagent is present in excess and therefore remains unreacted?

If anyone can help me i'd really appreciate it. I don't know what I am doing and this is worth 50 points which i reaaallyyy need!

2006-11-06 05:59:42 · 2 answers · asked by Anonymous in Chemistry

A ball is rotating in a horizontal circle at the end of a string that is 3.2 m long at an angular velocity of 11.5 rad/s. The string is gradually shortened to 2.7 m without any force being exerted in the direction of the ball's motion.

A) Find the new angular velocity fo the ball in rad/s. (the ans. is not 13.63??).

B) Find its new linear speed in units of m/s. (36.8 is not right??).

2006-11-06 05:57:18 · 5 answers · asked by Mariska 2 in Physics

Why is the reaction of alkenes with HCl (a rapid, simple reaction) NOT useful as a characterization reaction, but reaction with Br2 is a good characterization reaction?

2006-11-06 05:56:50 · 6 answers · asked by kelxcore09 1 in Chemistry

i just wanted to know if all chemical energy has an internal resistance or not... i know wat a chemical energy is but not sure if every chemical energy have an internal resistance within it.

2006-11-06 05:53:40 · 1 answers · asked by bex 2 in Physics

2006-11-06 05:49:34 · 3 answers · asked by Hatch3r 1 in Zoology

if the number of moles of gas is doubled at constant temperature and volume, the pressure of the gas.

a. halved
b. is doubled
c. is quadrupled
d. remains the same

2006-11-06 05:46:51 · 4 answers · asked by Shawn 1 in Chemistry

Which of the following is the reciprocal of -3?
a) 3
b) 1/3
c) - 1/3
d) -3/1

2006-11-06 05:46:27 · 11 answers · asked by Anonymous in Mathematics

2006-11-06 05:44:44 · 20 answers · asked by laulee4 2 in Mathematics

A light is suspended at a height h above the floor. The illumination at the point P is inversely proportional to the square of the distance from the point P to the light and directly proportional to the cosine of the angle theta. How far from the floor should the light be to maximize the illumination at the point P?

Additional information:
Point O is the point directly below the hanging light.
Point P is 10m from point O.
r is the distance from the light to point p.

2006-11-06 05:44:10 · 1 answers · asked by numbergirl 1 in Mathematics

I am thinking of four consecutive integers. The sum of the second and fourth equals the third increased by 17.

Write that into an equation.

2006-11-06 05:43:44 · 6 answers · asked by Anonymous in Mathematics

2006-11-06 05:43:15 · 2 answers · asked by dumbblonde171121 1 in Earth Sciences & Geology