Science & Mathematics - 3 December 2006

Best answer to whoever has the correct answer and best explanation.

A ball is launched with an initial velocity of 5m/s from a desk with a height of 1.647m above the ground at a 40 degree angle of elevation. How far from the point of launch will it land?

Note, air resistance can be neglected, but if you know a way to igure it in, that would help. If I am missing something needed to answer this, please tell me.

2006-12-03 15:27:10 · 4 answers · asked by Give me best answer 4 in Physics

Define a variable and write a quadratic function to describe each situation. Then find the two numbers that maximize or minimize each product
a- find the maximum product of two numbers whose sum is 80
b-find the minimum product of 2 numbers whose difference is 10


A store manager receives 100 dresses with a suggested retail price of $70. The projected sales are $20 dresses per week. Based on past experience, the store manager knows that sales will increase by 2 dresses per week for every $5 decrease in price.

a- find a function that gives the store's weekly revenue as a function of the number of $5 decreases
b-what price maximizes weekly revenue?

2006-12-03 15:23:49 · 5 answers · asked by Jen 2 in Mathematics

I'm looking for a "picture of the entire universe". A sort of outside view. I expect anything that would satisfy me would (duh) have to be an artist's rendering or some sort of computer graphic, instead of an actual photo. But, bonus points would be something accompanied with an explanation of why it's a scientifically accurate representation.

2006-12-03 15:22:44 · 6 answers · asked by arantius 1 in Astronomy & Space

An unknown gas, X2(g), which behaves much like N2(g) (NN), is analysed and the following enthalpies of formation are obtained:

Gas |enthalpies of formation
X(g) | 401 kJ/mol
H(g) | 217 kJ/mol
X2H4(g) |201 kJ/mol


We also know that the X-H bond energy is 333 kJ/mol.
Use this information to estimate the X-X (single-)bond energy in the X2H4 molecule.

2006-12-03 15:22:36 · 1 answers · asked by smokefanTS20 3 in Chemistry

how would I do the elimination and subsituition method for systems of equation...
A) {x-3y=1
{ 5x-7y=19





B) {2x+7y=4
{4x-y=3

2006-12-03 15:22:06 · 4 answers · asked by Anonymous in Mathematics

if you were in a deep well durning the daylight hours and you looked up can you indeed see the stars?

2006-12-03 15:20:15 · 11 answers · asked by Anonymous in Astronomy & Space

at equal distances from each other and far apart as possible. How far apart can the trees be planted?

2006-12-03 15:20:13 · 1 answers · asked by Dee Dee 1 in Botany

2006-12-03 15:18:23 · 13 answers · asked by Anonymous in Zoology

Gasoline is about $2 per gallon. You use about gallons each day driving to and from work. How much should you budget for gasoline over the next month (about 20 workdays)?

2006-12-03 15:18:22 · 5 answers · asked by Hairdresser4you 3 in Mathematics

2006-12-03 15:17:47 · 14 answers · asked by Michele 2 in Mathematics

A. H2O and SO42–
B. H2O and H3O+
C. H3O+ and HSO4–
D. H3O+ and SO42–

2006-12-03 15:17:34 · 1 answers · asked by Aurora C 1 in Chemistry

4x + 4y = 4
x + y = 1

2006-12-03 15:15:58 · 4 answers · asked by keithj91672 1 in Mathematics

How much energy is needed to heat the water? The density of water is 1 g/ml.

2006-12-03 15:15:39 · 1 answers · asked by princess 1 in Chemistry

2006-12-03 15:15:14 · 12 answers · asked by Todd R 1 in Other - Science

I need help with this algebra problem...i have no idea how to solve it.........Kim throws a ball straight up into the air. The ball reaches a maximum height of 8 feet above the ground in .5 seconds.
a) Find the equation giving the ball's height (h) as a function of time (t).
b) When does the ball hit the ground?

2006-12-03 15:14:58 · 5 answers · asked by Jen 2 in Mathematics

11.00 g of solid NaOH are dissolved in water to give a final solution of 29.8 mL .
What is the molarity of this solution ?

2006-12-03 15:14:49 · 1 answers · asked by chemistry616 2 in Chemistry

1) A rock is released from rest at the top of a 100-m-tall building. How long does the rock take to fall to the ground, and what is its imapact velocity. (*hint: we live on planet Earth where gravity (g=9.80 m/s^2).


2) A cannon ball is shot straight up with an inital speed of 100 m/s. How high does it go. (*hint: you need to use more than one formula because in order to get how high we need something else).


3) This problem is related to #2.
A ball is thrown vertically upward with a speed of 19.6 m/s.
a...What is the ball's velocity and its height after 1second? After 2 seconds? After 3 seconds? After 4 seconds? And after 5 seconds? (*hint: unlike the previous question, here you don't need to use an extra equation b/c I have given you time; where as in the previous question you needed to solve to time. But again, think of velocity of the ball at the very very very top for that split second.

b...Draw the ball's velocity-vs-time graph.
(remember the time is on the x-axis of the graph and velocity is on the y-axis of the graph). Let's make the time range from 0 seconds - 5 seconds.


4)
a...What constant acceleration, must a car have to go from zero to 26.82 m/s (60 mph) in 10 seconds?

b...How far has the car traveled when it reaches 60 mph?


5) Draw a free body diagram for the following:
-Book standing on top of the table.
-Dorian is pushing the book across the table where he exerts a force of 10N, make sure to include friction, which is opposite side of the motion/movement.
-You sit on the chair. Sum up the forces.
-You're pulling a sled with 15N of force applies and making an angle 30 degree.

6) Calculate your weight on (a)Planet Earth. (b)Planet Mars.

2006-12-03 15:11:52 · 2 answers · asked by i<3snow 1 in Physics

I'm hoping an entomologist may know why flies are so persitent and determined - despite being constantly chased away - to rest on humans. What's the attraction and what are they doing once they sit on you?

2006-12-03 15:10:56 · 5 answers · asked by Stevie L 2 in Zoology

im really confused. im 18 and considering going to nursing school. im in a two-year college right now, but have not yet taken the exam to get into the nursing program which will take two years. if i get in, ill spend three years at the colllege. this made me think i might as well transfer to a 4 year college for BSN. but im really confused....which 'route' would i take?????

2006-12-03 15:09:27 · 3 answers · asked by vincent m 2 in Medicine

sqrty+1=2-sqrt-y-4

and how do i assume that all variables are represented by positive reall numbers.
sqrt - cube z^12/ 27 x^3

2006-12-03 15:09:08 · 3 answers · asked by colecole1979 1 in Mathematics

i need to write h2o etc. the right way

2006-12-03 15:09:05 · 3 answers · asked by ? 1 in Physics

2006-12-03 15:07:43 · 10 answers · asked by Anonymous in Astronomy & Space

If 30g of water at 5C are mixed with 50g of water at 70C and 25g of water at 100C, what is the final temperature of the mixture?

I know how to do this with 2 masses/tempertures, but I don't know how to do it with 3.

I also know aobut Q = mc/\t and that heat lost = energy gain, but again with 3, i'm clueless.

Thanks!

2006-12-03 15:05:59 · 3 answers · asked by alonso_fan85 1 in Physics

A diver achieves a horizontal velocity of 3.75 m/s from a diving platform located 6.0 m above the water. How far from the edge of the platform will the diver be when he hits the water?

2006-12-03 15:05:42 · 3 answers · asked by Anonymous in Physics

A 40kg satellite circles the earth in an orbit with a period of 60 min. What minimum energy (in J) is required to change the orbit to another circular orbit with a period of 180 min?

I have to use: radius earth r=6.4EE6m mass earth M=6EE24kg
G=6.7EE-11 Nm^2/kg^2

I think I can assume that r becomes 3r even though an orbit isn't a circle. And the period T becomes 3T.

I know I need to use the formula for mechanical energy and also the formula for the period T^2=( 4pi^2/GM )r^3 but how do I figure out r first??
When I solve the last equation for r using T in seconds, I get 5091.24 km but this is less that the r of the earth so something is wrong.
Who can help, what am I not seeing??

2006-12-03 15:05:18 · 1 answers · asked by dutchess 2 in Physics

the intervals are 0 and 2 pie

2006-12-03 15:04:54 · 3 answers · asked by Matthew M 1 in Mathematics

help please

2006-12-03 15:04:33 · 6 answers · asked by Hairdresser4you 3 in Mathematics

Calculate the current that flows in a 150mH inductor connected to a 100v, 250 Hz supply.

Show work

2006-12-03 15:03:08 · 2 answers · asked by element69ca 1 in Engineering

I need help with this algebra problem...i have no idea how to solve it.........Kim throws a ball straight up into the air. The ball reaches a maximum height of 8 feet above the ground in .5 seconds.
a) Find the equation giving the ball's height (h) as a function of time (t).
b) When does the ball hit the ground?

2006-12-03 15:02:45 · 1 answers · asked by Jen 2 in Engineering

THANKS! ; )

2006-12-03 15:02:42 · 1 answers · asked by feelingtherain 2 in Physics