Science & Mathematics - 17 October 2007

This is a question from my Gr 12 Physics textbook...and i don't understand it.

A Small box is resting on a larger box sitting on a horizontal surface. When a horizontal force is applied to the larger box, both boxes accelerate together. The small box does not slip on the larger box.
a) Draw a FBD of the small box during its acceleration.

If you can please explain all the forces that are acting on the box. I know there is the force of Gravity and the Normal force. There is supposed to be other forces but im not sure what they are, what direction they are goin in and why they exist. If anyone can explainit, thatd be awesome.

2007-10-17 12:47:33 · 1 answers · asked by hempplant2004 1 in Physics

using the data in the table below and assuming the growth is exponential, when would the populations of Austin and Columbus be equal?

Austin: population: 1990=465,622 2000=656,562
Columbus: population: 1990= 632,910 2000=711,265

2007-10-17 12:46:59 · 1 answers · asked by nathan 2 in Mathematics

i already did this -b+5-5=-16-5
-b =-21
but when i check it i get 21+5=26 because a negative plus anegative equals a positive

2007-10-17 12:44:07 · 8 answers · asked by coolgeorgerod 2 in Mathematics

Several Symols sat silently and snacked on sugary sweets.
Well, and tea, too. But that would have ruined the alliteration.

Anyway, after tea, they decided to burrow out a larger burrow. In the first hour, they burrowed out 427 cubic inches of dirt. In the next hour, they burrowed out 256 cubic inches of dirt. In the third hour, they burrowed out 312 cubic inches of dirt. In the fourth hour, they burrowed out 546 cubic inches of dirt. In the fifth hour, they burrowed out 656 cubic inches of dirt. And in the sixth hour, they burrowed out 823 cubic inches of dirt. They continued for one more hour after that.

How many cubic inches, total, did they burrow in those seven hours?

2007-10-17 12:43:58 · 4 answers · asked by pegtalay 1 in Mathematics

If there can be living things on earth, then why can't their be living things on other planets or in other galaxies...

2007-10-17 12:43:23 · 22 answers · asked by Ms. Huff 2 in Astronomy & Space

1) 4 goals in 10 attemps

2) 15 dimes out of 24 coins

3) 10 inches to 3 feet

4) 5 feet to 5 yards

2007-10-17 12:41:46 · 1 answers · asked by haaaaahaaaa! 1 in Mathematics

Okay, here are the choices:

1) y= 2x + 4
2) y= x^2 - 4x + 3
3) x = 3y - 2
4) x= y^2 +2y - 3

Which is NOT a function?

Okay, so
it's not number one b/c no. 1 is a function. I put the equation in my calc. and on the graph, i got a line. so i did the vertical line test and it only passes it once- so it IS a function.

not no. 2 b/c tht is a function as well. same thing- put in calc. got a parabola- vert. line test- only pass once- IT IS A FUNCT.

not no. 3 because after i solved for Y. put in calc--same thing- vert line test- passed once- so it is a function...

no 4....i do not get how to solve for Y.....i did: ADD 3 on both sides...got x +3 = y^2 + 2y...then divided by 2, got x + 3 = y^2...square root that??????? can someone help me with tht IF i did it so far....

help....again, i am supposed to tell which is not a FUNCTION and WHY?

thanks !!!!!!!!! :)
xoxo
xoxo

2007-10-17 12:37:54 · 5 answers · asked by Anonymous in Mathematics

A 0.40 kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the tension is 16 N. What are the tensions in the string when the ball is at the twelve o'clock and at the six o'clock positions.

2007-10-17 12:36:47 · 3 answers · asked by Singh J 1 in Physics

I would bet that if they were all organised then they could take over the world!!!

2007-10-17 12:33:43 · 21 answers · asked by mattie_blower 3 in Zoology

A block of ice has a volume of 8 cubic metres. After 3 quarter of ice has melted, what amount in mm (milimetres) remains?

2007-10-17 12:33:11 · 7 answers · asked by Anonymous in Mathematics

Hey, we need an answer for this question please??? Thankyou muchly xox

2007-10-17 12:32:24 · 13 answers · asked by chook1371 1 in Astronomy & Space

The human being is both an individual and all of humanity (ie; shared gene pool, shared environment, shared energy) in the same way that light is both particle and a wave? Please help me to further my understanding.

2007-10-17 12:31:12 · 5 answers · asked by CSkyways 2 in Physics

A Super Lemon currently weighs 100 kg and is increasing by 4 kg per day. The price for Super Lemons is currently 8.90 per kilogram but is decreasing at $0.30 per kg per day. The cost to grow the lemon is $0.80 per day. Determine how many days from now the lemon should be sold to maximize profit and what the maximum profit will be.

Help me solve this please? I am so lost.

2007-10-17 12:30:37 · 1 answers · asked by tangerine_crunge 2 in Mathematics

how is it possible to demonstrate the invisible radio waves that are traveling through the air all around us?

2007-10-17 12:29:36 · 5 answers · asked by JoMaR 1 in Astronomy & Space

using the data table and assuming the growth is exponential, when would the population of Austin and Columbus be equal?


AUSTIN: 1990 Population = 465,622
AUSTIN: 2000 Population = 656,562
Columbus : 1990 Population = 632,910
Columbus: 2000 Population = 711,265

2007-10-17 12:28:31 · 2 answers · asked by nathan 2 in Geography

2007-10-17 12:26:46 · 2 answers · asked by Congi 1 in Earth Sciences & Geology

2007-10-17 12:25:54 · 3 answers · asked by bella 1 in Physics

Which compound of glycolysis is the entry into the Calvin cycle?

Which compound is the entry back into Glycolysis?

2007-10-17 12:25:37 · 2 answers · asked by Mike R 2 in Biology

2007-10-17 12:24:05 · 2 answers · asked by melodi1 6 in Medicine

2007-10-17 12:23:14 · 3 answers · asked by Tasheba F 1 in Geography

using a right triangle

b=4 opposite
c=6 hypo

find a = adj.
alpha and beta

please help

2007-10-17 12:23:08 · 7 answers · asked by Anonymous in Mathematics

The question is as follows:

What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be added to 12.0 L of water to produce an antifreeze solution with a freezing point of -24.0°C? (The density of ethylene glycol is 1.11 g/cm3, and the density of water is 1.00 g/cm3.)

I keep getting an answer of 10.8 L, and WebAssign keeps telling me I am wrong.

Also, there is a part II to the Question, asking what the boiling point is to the solution. If anyone could help me with that, it'd be great.

I am not neccesarily looking for answers (though they'd be appreciated), just an explanation for how to find them. Thanks!

2007-10-17 12:23:08 · 1 answers · asked by undzeichnete 1 in Chemistry

I'm trying to figure out the pattern to find out what the next number would be. They are in cubic inches (if that helps; I'm not sure if that's needed or not to figure the pattern out).

Anyway, the numbers are:

427, 256, 312, 546, 656, 823, (next number here)

Thanks in advance to anyone that can help me out!! :D

2007-10-17 12:22:17 · 2 answers · asked by Punky Brewster 4 in Mathematics

The logistics map is the function f:[0,1] -> R, defined by f(x)=ax(1-x). Thus, x of n+1 = f(x of n) {Note, I say x of n+1 to represent x with the subscript n+1} and (x of n) = (x of 1, f(x of 1), f(f(x of 1)), ...). We write f^2(x) for f(f(x)), and so on.

Check that f has a global maximum of a/4 at x=1/2. Deduce that f maps [0,1] back into [0,1] if 0 <= x <= 4

From the above, we restrict ourselves to seeds, x of 1, from (0,1) and a epsilon (0,4). In fact the zone of a values in (0,1) is also not so interesting - the population is doomed to extinction.

Im having trouble with the deuce part. Thanks

2007-10-17 12:19:15 · 1 answers · asked by Jeff K 2 in Mathematics

What quadrilateral do they make and how can you find out?

2007-10-17 12:16:47 · 3 answers · asked by greg.cramer33 1 in Mathematics

Grade 11 physics.

2007-10-17 12:16:44 · 3 answers · asked by Anonymous in Physics

for algebra we have to remember 1- 25's second power such as

1/\2, 18/\2, 15,/\ ect...

but it cant be somthing in order because durning the test my teacher does it randomly

2007-10-17 12:15:25 · 8 answers · asked by Tina 2 in Mathematics

I had a quiz today and I didn't went to school for like a week and I had to answer these two problems, but I really didn't know what to do.I would like someone to explain it to me step by step how to solve it plzzz.

1)A vector drawn 6cm long represent a force of 23N.
what force does a vector that is 13cm long,drawn to the same scale, represent? answer in units of N.

2)A vector drawn 6cm long represents a force of 64N.
How long would you draw a vector for a force of 124N? Answer in units of cm.

2007-10-17 12:14:10 · 1 answers · asked by Anonymous in Physics

If a graph has a vertical asymptote and the limit of the function is infinity or negative infinity on BOTH SIDES of the asymptote is there a way to know this just by the actual function. I know there's a way to differentiate this kind of graph from a graph that has one side going to infinity and another to negative infinity, I just don't know how. Thank you.

2007-10-17 12:11:38 · 1 answers · asked by dumbleeedore 1 in Mathematics

my teacher gave us about 6 problems N i dont know how to work them. can you show me step-by-step how ya do them? you dont have to do all of the problems because i want to do the rest so that i can learn from it...


1.) (-8x)2 (-x3) ..-->> the 2 and 3 are exponents

2.) -3/7(-w2)(7w2)...-->> the 2's are exponents

3.) 4w2 -w(2w-3)..-->> the 2 in (4w"2") is an exponent

thanks for the help!

2007-10-17 12:09:43 · 1 answers · asked by Anonymous in Mathematics