Science & Mathematics - 19 September 2007

Why can't my TI-84 plus graph two equations at once

2007-09-19 16:46:51 · 1 answers · asked by Anonymous in Mathematics

2007-09-19 16:38:01 · 9 answers · asked by Anonymous in Biology

I'm in pre-cal this year and we're doing some alg 2 review
and i really don't have the time to factor 100 more problems (i've already done 50 btw)
so yeahh
this one guy in my class has a calculator (it's like the ti-89 or something like that)
and it has a program that factors equations for you
so i figure if a calculator has a program like that
there's got to be a website like that

2007-09-19 16:36:28 · 5 answers · asked by Nicole 3 in Mathematics

2007-09-19 16:33:56 · 2 answers · asked by dyen2skate 1 in Physics

An alpha particle with a Kinetic E of 7.00 MeV makes a head on collision with a gold nucleus at rest. What is the distance of closest approach of the 2 particles ( assume that the gold nucleus remains stationary and that it may be treated as a point charge. The atomic number of gold is 79, and an alpha particle is a helium nucleus consisting of 2 protons and 2 electrons. )

2007-09-19 16:32:54 · 1 answers · asked by sahar p 1 in Physics

A 1.50g sample of nitrous oxide (an anesthetic, sometimes called laughing gas) contains 2.05 * 10^22 N2O molecules. how many nitrogen atoms are in 1.00g of nitrous oxide?

2007-09-19 16:30:21 · 2 answers · asked by kennilope 3 in Chemistry

The flame is normally blue. Does the fact that there is salt in the kettle have anything to do with it?
.

2007-09-19 16:29:28 · 9 answers · asked by Wise@ss 4 in Chemistry

Why is a flame called "A Naked Flame"?

2007-09-19 16:27:25 · 4 answers · asked by Anonymous in Physics

If an electron is orbiting an atom, it can only exist in certain shells. Why can't an electron orbit an atom at any energy level, just like a moon could orbit a planet at pretty much any altitude? I welcome both short and long answers. I would especially appreciate links to diagrams or web sites that explain this well.

2007-09-19 16:26:58 · 4 answers · asked by Anonymous in Physics

I'm just curious as to what options are available to somebody with a history severe keloid scarring.

2007-09-19 16:25:55 · 1 answers · asked by psy_phi_major 2 in Medicine

by a horizontal force F.
What is the magnitude of F?

What is the magnitude of the force exerted by the ramp on the crate?

2007-09-19 16:25:05 · 1 answers · asked by tosinjesu 1 in Physics

Are all rocks likely to weather at the same rate?

2007-09-19 16:24:19 · 10 answers · asked by Anonymous in Earth Sciences & Geology

a tortoise can run with a speed of 16.0cm/s, and hare can run exactly 15 times as fast. In a race, they both start at the same time, but the hare stops to rest for 120 seconds. The tortoise wins by 20.0cm. How long does the race takes? What is the length of the race.

2007-09-19 16:22:39 · 1 answers · asked by Christina H 1 in Physics

2007-09-19 16:21:01 · 8 answers · asked by dantedemitre 2 in Physics

Im looking for a timer for an electric oil filled radiator that is intergrated into a single gang wall switch - timer must be up to 2 hours and preferably solid state/digital - not mechanical. any ideas where I can find one?

2007-09-19 16:20:49 · 3 answers · asked by Anonymous in Engineering

1.The atrioventricular valve on the right side of the heart is the ?
2.Repolarisation of the ventricles is represented on an ECG by ?
3.The pacemaker of the heart is?
4.Cardiac output is the product of which 2 measurements?
5.The middle layer of the heart, composeed of mainly cardiac muscle, is called the?
6.De-oxygenated blood is carried away from the heart muscle by?
7.Follow the proper pattern of blood flow through the heart starting at the vena cava and finishing at the aorta?

2007-09-19 16:20:32 · 4 answers · asked by Nini 1 in Medicine

Emiy takes a trip, driving with a constant velocity of 89.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 76.8 km/h to the north, how long does the trip take?

2007-09-19 16:19:46 · 1 answers · asked by Christina H 1 in Physics

The questions are:
27^x/9^2x-1=3^x+4

27^x(9^2x-1)=3^x+4

and
27^x+1=(1/9)^2x-5

I'd even be happy if you could just solve one:) Thank you!

2007-09-19 16:18:39 · 1 answers · asked by HSR 2 in Mathematics

Four particles with masses 2kg, 7kg, 3kg, and 6kg are connected by rigid rods of negligible mass. The origin is centered on the mass in the lower right corner. The rectangle is 7m wide and 5 m long.

a) If the system rotates in the xy plane about the z axis with an angular speed of 6 rad/s calculate the moment of inertia of the system about the z axis. Answer in units of kgm^2.

b) Find the rotational energy of the system. Answer in units of J.

2007-09-19 16:15:10 · 1 answers · asked by Anonymous in Physics

As of September 19, 2007.

2007-09-19 16:12:29 · 6 answers · asked by Melissa 2 in Geography

I guess if you think about it, gravity has to be equally "distributed" (for lack of a better word), because the earth is round.
But then I've heard about these "Mystery spots" where they say there is no gravity or that the pull of gravity is not as strong.
Do these spots affect the earth in any way?
Could they possibly be placed there strategically (by God.. or for those who dont believe in god.. some "higher being" who created the earth) to keep the earth on track and rotating correctly?

2007-09-19 16:07:28 · 9 answers · asked by Anonymous in Physics

2007-09-19 16:07:14 · 9 answers · asked by Savannah the Great. 2 in Mathematics

Can someone please provide me a link to a Health and Safety guidelines document for Engineers. I tried searching the web to no avail . Thank you .

2007-09-19 16:04:31 · 1 answers · asked by Anonymous in Engineering

2007-09-19 15:59:04 · 5 answers · asked by Anonymous in Earth Sciences & Geology

A rotating fan completes 1200 revolutions every minute. Consider the tip of a blade, at a radius of 0.15 m. Here are the questions: (a) Through what distance does the tip move in one revolution? Also, what are (b) the tip's speed and (c) the magnitude of it's acceleration? (d) What is the period of motion? Show and explain your work. Thanks!

2007-09-19 15:59:04 · 1 answers · asked by Anonymous in Physics

ok is the least common multiple of 6 and 3
6?

6x1=6
3x2=6

ITs probably right but o well
waste 5 pts

2007-09-19 15:57:16 · 5 answers · asked by yahoo2000 2 in Mathematics

Does anyone know where to start to setting up an experiment where I would have to find the density of 10 objects and then arrange them in order from most dense to least dense. There are cubes, balls, all different shapes. What would I have to do to find the density of each? Thanks.

2007-09-19 15:54:40 · 4 answers · asked by Trace T 1 in Chemistry

2007-09-19 15:51:05 · 2 answers · asked by Sara F 1 in Weather

A small ball rolls horizontally off the edge of a tabletop
that is 1.20m high. It strikes the floor at a point 1.52m horizontally from the table edge. (a) How long is the ball in the air? (b) What is its speed at the instant it leaves the table? Show and explain your work. Thanks :)

2007-09-19 15:48:26 · 1 answers · asked by Anonymous in Physics

I am currently stuck on this question and I dont know how to start it.

[ (3u+4)(2u-2)^3 ] / [ (u-1)^2 ]

Additional Details
This is as u approaches 1 sorry

2007-09-19 15:45:15 · 1 answers · asked by Pngo 1 in Mathematics