Science & Mathematics - 24 September 2007

2007-09-24 04:20:09 · 4 answers · asked by harini memon 1 in Chemistry

2007-09-24 04:17:39 · 3 answers · asked by afchica101 1 in Earth Sciences & Geology

I'm searching for a Doctor for my mother who is 50 years of age. What are some areas of specialization that I should look in a doctor for my mother? Is it just a regular family doctor? Primary? I need one that deals with problems w/ aches in particular body parts. I would greatly appreciate your help. Thank you!

2007-09-24 04:17:08 · 4 answers · asked by Bella Luna 3 in Medicine

The combined resistance of two resistors R1 and R2 in a parallel circuit is given by the formula Rt=1/1/R1+1/R2. simplify the formula.
Where I have typed R1 and R2 the number is supposed to be little and below the r to the right? Does this make sense? Kind of like how we would write the exponents but down instead of up.

2007-09-24 04:15:54 · 4 answers · asked by Anonymous in Mathematics

A rocket is launched at an angle of 55.0° above the horizontal with an initial speed of 98 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 30.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile.

(a) Find the maximum altitude reached by the rocket.
m
(b) Find its total time of flight.
s
(c) Find its horizontal range.
m

2007-09-24 04:09:58 · 3 answers · asked by Foxychick 1 in Physics

2007-09-24 04:07:44 · 3 answers · asked by Anonymous in Earth Sciences & Geology

A.21/30 B.12/15 C.13/10 D.18/20

2007-09-24 04:06:05 · 12 answers · asked by panktee p 1 in Mathematics

An airplane flies 200 km due west from city A to city B and then 300 km in the direction of 32.5° north of west from city B to city C.

(a) In straight-line distance, how far is city C from city A?
( km)

(b) Relative to city A, in what direction is city C?
(° north of west)

2007-09-24 04:05:17 · 2 answers · asked by Foxychick 1 in Physics

Vector A has a magnitude of 9.60 units and makes an angle of 49.0° counter-clockwise from the positive x-axis. Vector B has a magnitude of 8.00 units and is directed along the negative x-axis.

(a) Using graphical methods, find the vector sum A + B.

*Magnitude of A + B: units

*Direction of A + B: ° counterclockwise from +x-axis

(b) Using graphical methods, find the vector difference A - B.

*Magnitude of A - B: units

*Direction of A - B: ° counterclockwise from +x-axis

2007-09-24 04:03:36 · 2 answers · asked by Foxychick 1 in Physics

2007-09-24 04:03:01 · 9 answers · asked by bla b 1 in Astronomy & Space

I'm Looking for advice on which speed sensor I should use to measure a small cart. the cart is hardly bigger than a human hand.

2007-09-24 03:57:28 · 2 answers · asked by Anonymous in Physics

With the future of the official moon count of Jupiter (64?) somewhat cloudy, is there a web-site featuring an "orrey" of that system with a definitive line shown between the moons, the asteroid belt, and it's accompanying debris?

2007-09-24 03:51:53 · 2 answers · asked by Lawrence E 4 in Astronomy & Space

A lightning bug flies at a velocity of 0.25 m/s due east toward another lightning bug seen off in the distance. A light easterly breeze blows on the bug at a velocity of 0.25 m/s. What is the resultant velocity of the lightning bug?

2007-09-24 03:51:46 · 2 answers · asked by Ayy Girl! 1 in Physics

Is there any biochemistry and biogeographical evidence supporting the evolution of birds from reptiles or dinosaurs. Such as similarities in dna structure etc?

Sources would be a great help as I am doing an assignment on this.

2007-09-24 03:51:42 · 8 answers · asked by Anonymous in Biology

4469.6 grams of 10% H2SO4 mixed with 1047 grams of 45% KOH and 70 L of water (so total volume is ~75L), calculated should give a pH of around 2.....however in real life I get a pH of around 1.5-1.6....what is going on here????

2007-09-24 03:47:51 · 1 answers · asked by Anonymous in Chemistry

a jetliner can fly 6.5 hours on a full load of fuel. Without any wind, it flies at a speed of 2.10 x 10^2 m/s. the plane is to make a round-trip by heading due west for a certain distance, turning around, and then heading due east for the return trip. during the whole flight, the plane encounter 55.0 m/s wind from the jet stream, which blows from west to east. what is the maximum distance that the plane can travel due west and just be able to return home?





A swimmer, capable of swimming at a speed of 1.3 m/s in still water (the swimmer can swim with a speed of 1.3 m/s relative to the water) starts to swim directly across a 2.2 km wide river. However the current is 0.91 m/s and it carries the swimmer downstream


a) how long does it take the swimmer to cross the river?


b) how far downstream will the swimmer be upon reaching the other side of the river?

2007-09-24 03:46:06 · 1 answers · asked by Anonymous in Physics

Consider the following Linear Programming problem developed at Jeff Spencer’s San Antonio optical scanning firm:
Maximize profit = $1x 1 + $1 x 2
Subject to: 2 x 1 + 1 x2 ≤ 100
1 x1+ 2 x2≤ 100
a) What is the optimal solution to this problem? Solve it graphically.
b) If a technical breakthrough occurred that raised the profit per unit of , would this affect the optimal solution?
c) Instead of an increase in the profit coefficient that profit was overestimated and should only have been $1.25. Does this change the optimal solution?

2007-09-24 03:45:33 · 1 answers · asked by Depina 2 in Mathematics

2007-09-24 03:29:56 · 9 answers · asked by Anonymous in Physics

2007-09-24 03:28:22 · 7 answers · asked by Anonymous in Physics

2007-09-24 03:28:15 · 3 answers · asked by tracey j 1 in Physics

2007-09-24 03:26:56 · 7 answers · asked by Anonymous in Astronomy & Space

2007-09-24 03:26:20 · 5 answers · asked by Abdul Aziz A 1 in Medicine

2007-09-24 03:26:11 · 8 answers · asked by Anonymous in Astronomy & Space

4469.6 grams of 10% H2SO4 mixed with 1047 grams of 45% KOH and 70 L of water, gives a pH of 1.5, however my calculations give a pH of 2.02, what is going on here?

2007-09-24 03:12:19 · 1 answers · asked by Anonymous in Chemistry

2007-09-24 03:10:39 · 10 answers · asked by anantharaman k 1 in Astronomy & Space

1) y=-7x^2-6x-1

2)y=4x^2+8x-1

how do you do something like this

2007-09-24 03:10:32 · 2 answers · asked by camaroking08 1 in Mathematics

2007-09-24 03:10:25 · 1 answers · asked by hottie 1 in Mathematics

2007-09-24 03:09:01 · 8 answers · asked by anantharaman k 1 in Astronomy & Space

Would we get affected at all? Anyone know of any theories regarding this?

2007-09-24 03:08:06 · 10 answers · asked by Antares 6 in Astronomy & Space

2007-09-24 03:07:49 · 1 answers · asked by hottie 1 in Mathematics