Science & Mathematics - 13 September 2006

A hunter wusges to cross a river that is 1.3km wide and that flows with a speed of 6.4 km/h. The hunter uses a small powerboat that moves at a maximum speed of 14km/h with respect to the water. Draw the vectors to scale on a graph to determine the answer. What is the time necessary for crossing if the boat goes directly across the river? Answer in units of min. Your answer must be within +/- 5%

I don't get this problem... Please solve it for me or give me a way to solve this... Thanks!

2006-09-13 17:57:41 · 2 answers · asked by glorydefined 1 in Physics

2006-09-13 17:57:03 · 2 answers · asked by Chase 4 in Chemistry

2006-09-13 17:54:46 · 15 answers · asked by mentallyblond4life 2 in Earth Sciences & Geology

2006-09-13 17:51:39 · 11 answers · asked by SB 1 in Astronomy & Space

2006-09-13 17:45:13 · 30 answers · asked by lucy lu 1 in Mathematics

Solve: 27 - 8x^3
(3 -2x)(3+2x)^2
(3 -2x)(9+6x+4x^2)
is this right?

2006-09-13 17:40:46 · 9 answers · asked by rvn_villa 2 in Mathematics

You are at the center of a 20m equilateral triangle with a raptor at each corner. You can immediately accelerate to your top speed of 6m/s. The raptors can accelerate at 4m/s^2 to their top speed of 25m/s. The top raptor has a wounded leg and is limited to a top speed of 10m/s. The raptors will run towards you. At what angle should you run to maximize the time you stay alive?

2006-09-13 17:38:11 · 6 answers · asked by Elk n' Fresh 4 in Mathematics

2006-09-13 17:36:54 · 9 answers · asked by Dyphykult 1 in Mathematics

Problem 1

Determine the value of k for which the system of linear equations
4x + 5y = 12
8x + ky = 13 has no solution.

AND

Problem 2

Determine the value of k for which the system of linear equations
4x + 5y = 12
x + ky = 3 has infinitely many solutions.

I need help. I'm stumped.

2006-09-13 17:33:51 · 4 answers · asked by EARNEYW 3 in Mathematics

A travel agency offers two Boston outtings. Plan A includes hotel accomodations for three nights and two pairs of baseball tickets worth $645. Plan B includes hotel accomidations for five nights and four pairs of baseball tickets worth $1135.

Let x represent the cost of one night's hotel accomidation and let y represent the cost of one pair of baseball tickets. Write a system of equations you could solve to find the cost of one night's hotel accomidation and one pair of baseball tickets. solve the system.

2006-09-13 17:33:15 · 3 answers · asked by sonovabeeech 1 in Mathematics

Find the sum, difference, product, and quotient using the following fractions: 1 3/4 and 4/5. I have no idea how to do any of those and can you please help, I have a test of Friday 9/15.

2006-09-13 17:28:55 · 8 answers · asked by goof ball 2 in Mathematics

how to identify the graph type, Domain and range.

2006-09-13 17:27:22 · 2 answers · asked by aa1473 1 in Mathematics

If the toy rocket is launched vertically, how high does it rise in the interval
How fast is the rocket moving at the end of .80 s
What altitude does the rocket reach before falling back to earth
How long does it take to reach this altitude

2006-09-13 17:09:25 · 2 answers · asked by josh h 3 in Physics

road the same care traveling +27 m/s slows down at a rate of -6.5 m/s^2 to a stop on the same road
How much farther does the car travel on the road before coming to a stop
What maximum car speed will allow the car traveling on the road to stop in a distance of 43 m

2006-09-13 17:06:38 · 1 answers · asked by josh h 3 in Physics

2006-09-13 17:00:16 · 4 answers · asked by TiredOfSchool 1 in Chemistry

a height of 36 mm
How fast does the flea leave the ground
How long does the take-off acceleration last

2006-09-13 16:59:50 · 1 answers · asked by Anonymous in Physics

I need the answer in yards. If you want to go the extra mile, tell me how much I will pay for carpet installation. There are 3 areas to be covered:

15 ft x12 ft
30 ft x12 ft
17 ft x12 ft

The carpet guy will charge me $3.50 per square yard.

2006-09-13 16:59:03 · 8 answers · asked by jane 3 in Mathematics

2006-09-13 16:58:31 · 4 answers · asked by evaadar 1 in Earth Sciences & Geology

2006-09-13 16:58:31 · 4 answers · asked by je suis tres desole 2 in Mathematics

I have to detremine the graph of linear equation.
-2x+3y= -6
by finding the x and y intercepts. type the equation using function notation.
I have the answers x (3,0) y (0,-2) but I can't figure out how to get the function notation. please help. use intergers or fraction for any numbers in the expression.

helpppppppppppp.. I need a graphing calculator but can't afford one yet. one day will will get one.

2006-09-13 16:57:14 · 2 answers · asked by colecole1979 1 in Mathematics

accelerates upward at 3.0 m/s^2 What is the diver's depth when the cork reaches the surace 2.0 s later

2006-09-13 16:56:57 · 4 answers · asked by Anonymous in Physics

2006-09-13 16:55:16 · 1 answers · asked by Jonathan N 1 in Physics

2006-09-13 16:54:36 · 6 answers · asked by kp.eric 2 in Chemistry

What is the ball's average speed in m/s^2
How far does it move in this time interval

2006-09-13 16:54:09 · 2 answers · asked by Anonymous in Physics

It's really hard to explain, but, using math can you prove it? This guy apparently thinks it's wrong: http://www.timecube.com but he's insane anyway, so who cares.

The question asked is, "If positive one times positive one equals positve one, then why does negative one plus negative one equal positve one?"

The math he tries to prove it with is this:

-9 + -9 + -9 + -9 + -9 + -9 + -9 + -9 + -9 = -81

Do you see the flaw he made? there are a positive number of negative nine there, and it was multiplied by a negative number, so you must subtract -9 a bunch of times:

-9 - -9 - -9 - -9 - -9 - -9 - -9 - -9 - -9 = +63

But that's still wrong, and do you know why?

Because you always start with 0

here's the positive again:

+9 x +9 = +81
0 + +9 + +9 + +9 + +9 + +9 + +9 + +9 + +9 + +9 = +81

so,

what's the math then that proves this?

2006-09-13 16:53:13 · 11 answers · asked by Rockstar 6 in Mathematics

2006-09-13 16:52:09 · 3 answers · asked by eduardo 2 in Other - Science

Is there a public database online?

2006-09-13 16:51:09 · 5 answers · asked by presidentrichardnixon 3 in Weather

2006-09-13 16:50:30 · 24 answers · asked by britiani j 1 in Mathematics

off the cuff I'd say at least and 100 kiloton. Has anyone stopped to figure it out? And after watching it over again I think it amasing they stood as long as they did after getting hit. Does anyone else agree with me?

2006-09-13 16:46:37 · 4 answers · asked by JUAN FRAN$$$ 7 in Physics

When do gases deviate from ideality?

2006-09-13 16:45:43 · 4 answers · asked by Doven C 1 in Chemistry