Science & Mathematics - 30 January 2007

Iron has a property such that a 1.00 {\rm m}^{3} volume has a mass of 7.86 \times 10^{3} {\rm kg} (density equals 7.86 \times 10^{3} {\rm kg/m^3} ). You want to manufacture iron into cubes and spheres.

2007-01-30 15:51:17 · 2 answers · asked by Anonymous in Physics

I have a box full of water. I need to put a shaft/axle with one end in the box and the other sticking outside of it. Each end has a gear attached. I need to spin the gears using the axle and make the whole box waterproof so nothing will spill out.

The connection would be similar to the way a ship has the engine on the inside and the propeller on the outside attached by a turning shaft.

What is the name or method of that seal?

2007-01-30 15:50:47 · 2 answers · asked by Michael K 2 in Engineering

2007-01-30 15:50:12 · 15 answers · asked by ? 2 in Chemistry

I have 35 nickels and dimes . The value is $2.75. Find how many coins of each kind I have.

2007-01-30 15:49:43 · 5 answers · asked by Nicole H 1 in Mathematics

A rocket rises vertically, from rest, with an acceleration of 2.4 m/s2 until it runs out of fuel at an altitude of 1400 m. After this point, its acceleration is that of gravity, downward.

(a) What is the velocity of the rocket when it runs out of fuel?
I calculated this to be 81.9 m/s
(b) How long does it take to reach this point?
I calculated this to be 34.1 s
(c) What maximum altitude does the rocket reach?
I need help with this one.....answer should be in meters.
(d) How much time (total) does it take to reach maximum altitude?
Need help here too. Answer should be in seconds.
(e) With what velocity does the rocket strike the Earth? (Assume up is positive.)
________________m/s
(f) How long (total) is it in the air?
_________________ s

2007-01-30 15:46:31 · 4 answers · asked by Jessie L 2 in Physics

We were asked to do an exhibit that is interactive and interesting. Anything about physics! :D

2007-01-30 15:44:50 · 5 answers · asked by Anonymous in Physics

2007-01-30 15:44:31 · 5 answers · asked by purple_peaches_06 2 in Weather

I asked this questions before, in a bit of a different way. the most objection was the electrons dont orbit around the nucleus like planets around the sun, there in a kind of cloud. but there are actully spining things in atoms Iv been lead to belive. So could this be happening. bcos of the size difference it would be spining so fast in our view that it would look like a cloud to us.

2007-01-30 15:42:44 · 6 answers · asked by marvin b 1 in Physics

ok well can you give me some examples of elimanation and tell me how you found the answers

2007-01-30 15:42:39 · 4 answers · asked by Anonymous in Mathematics

..the natural process of decomposition of the human body? I still have half a mind to change my college major...Anyone studying this in school?

2007-01-30 15:41:56 · 3 answers · asked by ? 3 in Other - Alternative

A rocket fires two engines simultaneously. One produces a thrust of 760 N directly forward while the other gives a thrust of 472 N at an angle 16.8^\circ above the forward direction.

2007-01-30 15:38:59 · 1 answers · asked by Anonymous in Physics

My understanding is that one theory is that they lead to another dimension. If so, what is this dimenion? Is it time, as we know it, or is it something else?

Sorry for the basic way in which this question is worded, I don't have a very good grasp on this sort of thing, but i want to.

2007-01-30 15:38:17 · 5 answers · asked by LadyRebecca 6 in Astronomy & Space

2007-01-30 15:38:03 · 6 answers · asked by teck kim 2 in Chemistry

The man discovered some quarters and nickels in an old chest. There were 70 coins all together. Their value was $4.50. Find out how many of each coin where in the chest.

2007-01-30 15:35:45 · 3 answers · asked by Nicole H 1 in Mathematics

eNx

2007-01-30 15:35:13 · 4 answers · asked by -mik- 1 in Astronomy & Space

2007-01-30 15:34:23 · 11 answers · asked by heylow_girl 1 in Paranormal Phenomena

What the hell is an ion i fell asleep in class and wikipedia is even more confusing?also whats a valence electron?

2007-01-30 15:33:36 · 1 answers · asked by light within darkness 2 in Chemistry

2007-01-30 15:33:07 · 3 answers · asked by William T 1 in Mathematics

Is there ever a time at which a small magnetic field can eventually saturate magnetic shielding of very high quality such as MuMetal? Or can magnetic shielding block the magnetic field indefinitely? Would layers help?

2007-01-30 15:29:07 · 4 answers · asked by What_a_what 2 in Physics

2007-01-30 15:26:37 · 8 answers · asked by Richard H 2 in Mathematics

2007-01-30 15:26:25 · 10 answers · asked by Anonymous in Geography

2007-01-30 15:26:24 · 8 answers · asked by michael n 1 in Physics

when genetic traits are passed down through the sex chromosomes, is the fact that the y chromosome in men doesn't carry traits make that impossible, or have i read false information?

2007-01-30 15:25:45 · 5 answers · asked by leroyjenkinson 2 in Biology

If an airplane leaves Dallas at 200 km/h and flies due North into a steady 7 knot wind at the same time a train leaves anchorage at 35 mph, what town will the plane be near when the train reaches Hurricane Bridge near Denali?

2007-01-30 15:25:38 · 2 answers · asked by Anonymous in Mathematics

what is the Gcf of 48 & 72

2007-01-30 15:22:47 · 10 answers · asked by JACKiE 1 in Mathematics

2007-01-30 15:22:13 · 6 answers · asked by r r 1 in Mathematics

2007-01-30 15:21:10 · 5 answers · asked by Buck BUCK 2 in Physics

2007-01-30 15:20:43 · 7 answers · asked by crayola 2 in Botany

prove that it is impossible to have three consecutive intergers all of which are prime.

2007-01-30 15:20:06 · 10 answers · asked by platypus 2 in Mathematics

2007-01-30 15:19:55 · 4 answers · asked by urbabbiemexagee 1 in Physics