Science & Mathematics - 1 November 2007

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2007-11-01 13:37:24 · 9 answers · asked by Anonymous in Mathematics

A car travels at 38 m/s for 7 s. It then speeds up with a constant acceleration of 5 m/s^2 for 22 s. At the end of this time, what is its velocity in m/s?

2007-11-01 13:36:32 · 1 answers · asked by kickitup21 1 in Physics

please explain in understandable terms- if you can't explain it well, is there a web site you got it from/ found it on? Thank you!!!! (for Chemistry class)

2007-11-01 13:36:06 · 2 answers · asked by jada 1 in Chemistry

2007-11-01 13:33:17 · 5 answers · asked by a a 1 in Engineering

Yes I realize this has been asked before, and there is a very simple reason I am asking it again...hmm....in fact, I think I'll let that be part of the question too:

What simple, logical reason is there for reasking an old question?

2007-11-01 13:32:58 · 10 answers · asked by Anonymous in Other - Science

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2007-11-01 13:32:38 · 4 answers · asked by Anonymous in Mathematics

2007-11-01 13:31:43 · 4 answers · asked by Troopa06 1 in Mathematics

Just simply this expression

2007-11-01 13:28:04 · 14 answers · asked by tman 1 in Mathematics

F(x)=
square root (-x) x<0
3-x 0<(or equal to)x<3
(x-3)^3 x>3

Where is the function continous?
P.S. Its all part of the function. I don't get this. Please help.

2007-11-01 13:27:38 · 1 answers · asked by Anonymous in Mathematics

Problem- Suzie jumps from a 1 meter springboard with an initial upward velocity of 4.9 meters per second.
Questions i answered-
a- write an equation= -4.9t^2+4.9t
b. When will Suzie return to her initial height- 1 second
Questions I need help on-
c. When will she hit the water (water = 0 meters) assuming that you start from the 1 meter springboard.
d.How high above the water does she get?

Thank you.

2007-11-01 13:25:35 · 1 answers · asked by None 1 in Mathematics

4√6 x √6
would it be 4√36 = 2√6???

2007-11-01 13:24:46 · 5 answers · asked by NoTrigger 2 in Mathematics

2007-11-01 13:21:31 · 1 answers · asked by A S 1 in Earth Sciences & Geology

Hey, my teacher gave us a extra credit halloween themed worksheet and I desperately need the points but I'm to stupid to figure these out. Any help is awesome. Some work is necessary is but don't worry about showing every little step. Thanks!
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1. How many pounds of candy selling for $2.25 a pound should be added to two pounds of candy selling for $3.75 a pound to create a blend, which will sell for $2.85 a pound?

2. Alexis bought 14 bags of candy at the store for a total price of $41.52. She bought some bags of candy that cost $3.21 each and the rest cost $2.64 each. How many bags of the $3.21 candy did Alexis buy?

3. Austin, Anthony, and Brittany went trick or treating on halloween,. Altogether, the three of them collected 57 pieces of candy. Anthony collected 4 more than 3 times the number of pieces of candy collected by Austin. Brittany collected 7 less than the number of pieces collected by Austin. How much candy did Austin collect?

2007-11-01 13:17:50 · 7 answers · asked by Cameron S 2 in Mathematics

A bag contains 20 marbles. They are of three different colors. There are eight
blue marbles, seven red marbles, and five green marbles. You are asked to close
your eyes and draw marbles out of the bag, making sure you leave at least four
marblesof any one color, and at least three marbles of any second color.What is the maximum number of marbles you should draw?

2007-11-01 13:17:07 · 17 answers · asked by J 3 in Mathematics

How are cruise ships protected if they are hit by lightning?

2007-11-01 13:15:51 · 2 answers · asked by facethefacts 3 in Weather

Question 1:
Drill a hole all the way down to a depth 0.5 metre above the centre of earth. For that we need a long casing to stop sloughing and ground water into the hole. This is an ideal closed end casing which is strong enough to withstand high pressure and temperature inside the earth. Now put a sphere of 1 kg mass of 1 metre diameter at/ on the base of hole. The distance between the centre of the earth and the centre of the sphere is 1 metre.

Now apply the same universal law of gravitation to the two masses. Can I calculate the value of “g” (as Newton drive for his equation on the surface of the earth ) at this point by the following equation.

F = G M m/R^2 g = GM/R^2 , Where R = 1 metre, therefore R = GM, g= 3.98 x 10^14 m/sec^2. So Weight of this mass at o.5 metre above centre of earth =mg = 3.98 x 10^14 N. If not, please explain and why g = 10.7 m/sec^2 in inner core?

Question 2:
Now push the casing further down and past the centre of earth by half a metre. Now Again put a sphere of 1 kg mass of 1 metre diameter at/ on the base of shaft such that the centre of the earth and the centre of the sphere coincides. (Just like white and yolk of boil egg)
Apply the same universal law of gravitation to the two masses. What will be the value of “g” and the gravitational force?
F = G M m/R^2 g = GM/R^2 , Where R = zero metre, therefore g= 0 m/sec^2 or infinity & F=zero or infinity
If not, please explain why?

What is the value “g” at the centre of gravity of the earth?

Question 3:

Now push the casing further down and past the centre of gravity of earth by one km. Now remove the sphere and drop a stone from ground surface or the top of casing. So where will be the resting position of stone, centre of gravity of the earth or at the base of hole?

2007-11-01 13:15:16 · 3 answers · asked by ? 3 in Astronomy & Space

Captain Hook loved number puzzles. He left one such puzzle on Algebra Island,where he buried his magic treasure. The puzzle read:
Get ye to the palm tree at the middle of the isle. Face ye to the west. Think ye of the
number that is seventeen more than the quotient when six times the number of paces to
the treasure is divided by two. This number be equal to the sum when twelve more thannine minus fifteen is added to four times the number of paces to the treasure. Dig ye
only once, for if ye dig in the wrong spot, the treasure will disappear.How many paces should you take?

2007-11-01 13:14:07 · 3 answers · asked by J 3 in Mathematics

I'm a bit confused on how to use the indirect proof.
The problem is: "=" : BIconditional and

~(p≡q) conditional [(p conditional q) conditional ~ (q conditional )]

THANKS

2007-11-01 13:13:58 · 1 answers · asked by Anonymous in Mathematics

converts to energy each second.

2007-11-01 13:13:43 · 2 answers · asked by jawaiian103 1 in Astronomy & Space

The circumference of a sphere was measured to be cm with a possible error of cm. Use differentials to estimate the maximum error in the calculated surface area.

Estimate the relative error in the calculated surface area.

Hint: The circumference of a sphere of radius r is , and its surface area is . Eliminate first!

2007-11-01 13:13:20 · 1 answers · asked by samantha 5 in Mathematics

Please could you help me with this? and show me how you got th answers too,?
I do know that you have to plug in the variable for the value for one (x or y ).
Use elimination to solve each system of equations.

5.) 3x-4y=6
2x+3y=3

6.) 3x-5y=1
2x+3y= -12
use substitution or elimination to solve these system of equations-

7.) x+y=13
2x-3y=1

8.) 9x+2y=5
3x-y= -10

9.) 2x+y=1
x=5+y

10.) x= -8y
2x-3y=1

11.) 2x+4y=12
-3x+3y=63

12.) 5x-2y= -1
3x-y= -2

13.) Bill leaves his house for Ashley's house riding his bicycle at 8 miles per hour. At the same time, Ashley leaves her house heading toward Bill's house at 3 miles per hour.

a.) write a system of equations to represent the distance, d, each is from Ashley's house in h hours. They live 8.25 miles apart.

b.) Solve the system to determine how long they travel before meeting.

2007-11-01 13:13:18 · 2 answers · asked by Madeline the Bard 3 in Mathematics

I need help,
Explain the surface circulation of the south Pacific Ocean and how it changes during an El nin event.

2007-11-01 13:13:12 · 2 answers · asked by Karla Chokes Babies 1 in Weather

At the end of 1994, Frodo was half as old as his grandfather. The sum of the years they were born is 3838. How old will Frodo be at the end of 2007?

2007-11-01 13:12:34 · 6 answers · asked by J 3 in Mathematics

how would i solve this system?
with either elimination or substitution.

2r + 3t = -10
-1r - 2t = 12

2007-11-01 13:12:22 · 2 answers · asked by Anonymous in Mathematics

We know that in real world, extremity does not exist. When something approach to an extreme, it transfers to another thing. For example, we can trace adult to its childhood, to its birth, to its embryonic cell. But can we trace it any further down to 10^(-30)? No. It cannot be reduced in size further (in terms of life), because it transfers - the zygote comes from fertilization of sperm and egg cells, which come from parents (adults), and we then start the cycle all over again.

So why do some scientists believe there’s something call Big Bang and some others believe the Universe is infinite?

2007-11-01 13:09:40 · 4 answers · asked by Joe 1 in Physics

I don't understand how to do this. Thank you!

2007-11-01 13:09:29 · 3 answers · asked by Paulllll C 3 in Mathematics

I bought a pair of 1st generation Seben binoculars and am curious as to what causes the whine when they are active. I understand the principle behind how they work, but what causes the whine?

2007-11-01 13:08:43 · 10 answers · asked by Anonymous in Other - Science

2007-11-01 13:07:31 · 2 answers · asked by Anonymous in Astronomy & Space

Take the function f(x) = 9 x + 3 x^−1

Local minimum at x equals ___ with value___
Local maximum at x equals ___ with value ___

2007-11-01 13:05:18 · 3 answers · asked by Rachel 1 in Mathematics

x-> infinity and g(x) = (sqrt(x^2 + ax)) - (sqrt(x^2 +bx)) ???
explanation please the answer is (a-b)/2

2007-11-01 13:02:58 · 2 answers · asked by Moi 2 in Mathematics