Science & Mathematics - 31 October 2006

A tightrope is stretched 30 feet above the ground between the Jay & the Tee buildings which are 50 feet apart. A tightrope walker, walking at a constant rate of 2 feet per second from point A to point B, is illuminated by a spotlight 70 feet above point A.

a) How fast is the shadow of the tightrope walker's feet moving along the ground when she is midway between the buildings?

b) How far from point A is the tightrope walker when the shadow of her feet reaches the base of the Tee building?

c) How fast is the shadow of the tightrope walker 's feet moving up the wall of the Tee building when she is 10 feet from point B?

2006-10-31 12:52:20 · 3 answers · asked by Anonymous in Mathematics

How much heat is released to the surroundings when 4.07 g of aluminum reacts with excess iron(III) oxide to give aluminum oxide and metallic iron? (The heats of formation of iron(III) oxide and aluminum oxide are -822 kJ/mol and -1670. kJ/mol, respectively.)

I think this is 64kj but why do you have to devide 128 by 2 to get 64? why isnt the answer just 128?

2006-10-31 12:48:47 · 1 answers · asked by hmmm 2 in Chemistry

can yall please help me out?!

2006-10-31 12:47:42 · 7 answers · asked by andrea m 2 in Chemistry

Credit Cards In 1990, people charged $534 billion on the two most–used types of credit cards. In 1994, people charged $1.021 trillion on these same two types of credit cards. What was the rate of change?

2006-10-31 12:46:35 · 2 answers · asked by ~*bRiTtNaY*~ 2 in Mathematics

Find the integers that fit the following conditions:
*They are between 44 and 53
*The sums of their digets are prime
*They have more than three factors

2006-10-31 12:45:43 · 6 answers · asked by magan m 1 in Mathematics

2006-10-31 12:44:13 · 12 answers · asked by marilyn_1002 1 in Mathematics

2006-10-31 12:42:18 · 4 answers · asked by Illegals Are S*** 3 in Zoology

2006-10-31 12:41:46 · 6 answers · asked by Anonymous in Physics

2006-10-31 12:41:42 · 3 answers · asked by Christine B 1 in Chemistry

2006-10-31 12:40:41 · 21 answers · asked by Anonymous in Zoology

The aliens wanted to try some earth food so this time Stephen takes the 48 of them to an ice cream store. They all order 1 or 2 scoops, in either a waffle or sugar cone.33 order waffle cones.5 order 1 scoop in a sugar cone. 37 order 2 scoops. how many scoops of ice cream are ordered?

2006-10-31 12:40:30 · 4 answers · asked by lostinmath 1 in Mathematics

2006-10-31 12:40:20 · 2 answers · asked by Simey F Baby 1 in Chemistry

I heard that the universe is constantly expanding, well if the universe is constantly expanding then matter and energy must be expanding with it, so if a person was able to travel back say 5000 years in the the past would his atomic mass be altered do to the fact that the universe of 5000 years ago would be more dence than it is today, if it was altered what would the results be?

2006-10-31 12:36:59 · 7 answers · asked by Anonymous in Astronomy & Space

2006-10-31 12:35:13 · 2 answers · asked by Bhargav S 1 in Botany

solve: log3(x+2)=10

3 is little beside g

2006-10-31 12:34:28 · 3 answers · asked by Sherry N 1 in Mathematics

Who ever gets the right answer first is going to be my best answer.

2006-10-31 12:33:44 · 4 answers · asked by yinyellowx 2 in Earth Sciences & Geology

Predict the signs of spontaneous change for each of the following processes. (+ or -)?

a.) A piece of wax melting
b.) silver chloride precipitating from a solution
c.) Dew forming
d.) gasoline vapors mixing with air in a car engine
e.) hot air expanding
f.) breath condensing in cold air

2006-10-31 12:33:25 · 3 answers · asked by softball579 1 in Chemistry

2006-10-31 12:32:54 · 4 answers · asked by ace f 1 in Botany

2006-10-31 12:31:44 · 5 answers · asked by <3 1 in Botany

are they dependent on people to sheer them? would they just keep growing wool until they died of heat in the summer??

2006-10-31 12:31:26 · 17 answers · asked by ylanger ylanger 3 in Zoology

2006-10-31 12:31:10 · 7 answers · asked by abhijit u 1 in Engineering

2006-10-31 12:29:18 · 9 answers · asked by Just 2 in Chemistry

This will be on my test tommorrow and i want to know what the answer is. can someone help me figure it out?

2006-10-31 12:28:13 · 2 answers · asked by Ballerina 1 in Chemistry

2006-10-31 12:27:44 · 7 answers · asked by Just 2 in Chemistry

I heard that the universe is constantly expanding, well if the universe is constantly expanding then matter and energy must be expanding with it, so if a person was able to travel back say 5000 years in the the past would his atomic mass be altered do to the fact that the universe of 5000 years ago would be more dence than it is today, if it was altered what would the results be?

2006-10-31 12:26:09 · 10 answers · asked by Anonymous in Physics

show work

2006-10-31 12:24:57 · 15 answers · asked by sk8er V 2 in Mathematics

k we talked about it i class today but i didnt get it

1. sodium+aluminum chloride- sodium chloride&aluminum

2. patasum bromide+ chlorine- patasum chloride&bromine

3. hydrogen peroxide - water & oxygen

k if u could help thatxs sooooooooooo much

2006-10-31 12:23:51 · 4 answers · asked by degrassi_27 2 in Chemistry

2006-10-31 12:22:25 · 6 answers · asked by Anonymous in Biology

...would they have it at a pharamacy?

2006-10-31 12:22:15 · 3 answers · asked by Brian M 1 in Chemistry

Sure it helps for swimming, but alot of people get freaked out about it. Maybe i should just pursue a swimming career, unless they'll say I have an unfair advantage?

2006-10-31 12:22:09 · 5 answers · asked by kbkgraphx 1 in Biology