Science & Mathematics - 3 September 2007

1)You have three boxes. One contains two pennies, one contains a penny and a dime and the third contains two dimes. You randomly select a box and randomly pull out a penny. Is the following statement correct? There is a 50% chance that the other coin in that box is a penny. Explain.

The correct answer is no. There is something wrong with the statement, but I don't know what.


2) You are told that there is a 25% chance of it raining on any given day during August. You are also told there is a 50% chance of rain if it rained the day before and a 16.66% of rain if it did not rain the day before. Determine if these probabilities are all consistent.

I don't know. I am thinking that since there is a 25% chance of raining on any given day, it will rain for about 25% of the month. The chance of rain should be greater then if it didn't rain the day before so I don't think the probabilities here are sensible. Am I correct?

2007-09-03 18:46:27 · 2 answers · asked by Vu 3 in Mathematics

2007-09-03 18:46:00 · 7 answers · asked by manoj n 1 in Astronomy & Space

This one is a bit different from the other problems...so here it goes:

Given f" is continuous
f(1) =2
f'(1) = 5
f(4) = 7
f'(4) = 3

Find integral (upper: 4, lower:1) xf"(x)dx

I take it that I'm supposed to value of f"(4) and f"(1) and find the difference of them, but how do you find a function for f and f'?

2007-09-03 18:45:08 · 2 answers · asked by J.W. 2 in Mathematics

2007-09-03 18:43:42 · 3 answers · asked by Anonymous in Chemistry

Show your calculation...

2007-09-03 18:40:53 · 2 answers · asked by Lalo C 1 in Geography

i read that i had to get intouch with the mind, so that i can be, sorta all believing and let that supernatural "happen" dont try to make it happen,

also to not "look for someting" i kinda get the concept, but have no idea of where to go with meditaion or how long it takes, to be meditated enough to begin moving things with thought vibrations

can someone point me in the right diretion, i feel like NEo from the matrix when morpheus told him to jump off a friggin building (how crazy does that sound?

2007-09-03 18:38:17 · 15 answers · asked by Anonymous in Parapsychology

Given that (x+37)/5 and (7x-1)/2 are two consecutive even integers, find the value of x.

Ans: x =3


Please show me the workings. Thanks a lot. :)

2007-09-03 18:33:16 · 9 answers · asked by ♪£yricảl♪ 4 in Mathematics

Problem: A sky diver jumps from a helicopter and is falling straight down at 30 m/s when her parachute opens. From then on, her downward accelereation is approximately a = g - cv2, where g = 9.81 m/s2 and c is a constant. After an initial transient period, she descends at a nearly constant velocity of 5 m/s.
a) What is the value of c, and what are its SI units?
b) What maximum deceleration is the sky diver subjected to?
c) What is her downward velocity when she has fallen 2m from the point at which her parachute opens?
OK, I worked through part a by using the chain rule to get a = (dv/ds)(ds/dt) = v(dv/ds) = g - cv2. Then I separated variables, etc, integrated both sides…And eventually ended up with: s = [-ln(9.81 - cv2)] / 2c + d, Where d was the constant of integration. I took it to be so, which I assumed to be 0 (since the initial height wasn't otherwise specified). The only thing is, that landed me with 0 = [-ln(9.81 - 900c)] / 2c

2007-09-03 18:18:24 · 2 answers · asked by Yuko 3 in Engineering

answer is -5/2 but what're the steps?

2007-09-03 18:18:19 · 10 answers · asked by sa 3 in Mathematics

It has been 2 years since I did math. I pretty much forgot how to do these. Any tips and help would be appreciated! Please and thank you!

Solve:
1. x + 3/2 = 3/4(x -1/2)
2. x + 3/5 = 7/5(x+1)
3. 5x = 4/5(5x-2)
4. 5/4(4x + 2) = 3
5. x + 4 = 2x - 8(1/4x - 1/4)

6. A movie ticket costs $6.50. You have $35.00 to buy tickets and popcorn for four people. How much money is left to buy popcorn after the tickets are paid for?
7. The bill for your automobile repairs was $265.74. The cost for labor was $52.00 per hour. The cost for materials was $135.74. How many hours did mechanic work on your automobile?

2007-09-03 18:07:36 · 6 answers · asked by Anonymous in Mathematics

2007-09-03 17:54:43 · 15 answers · asked by Asteria 2 in Astronomy & Space

So that I dont lose a lot of the tablet.

2007-09-03 17:54:35 · 11 answers · asked by Anonymous in Medicine

You are shipwrecked and floating in the Atlantic Ocean somewhere between London, England, and New York, NY. Fortunately, you managed to save your globe. You have been in London, so your watch is still set for London time. It is noon, by the Sun, at your location. Your watch indicates that it is 4:00 p.m. in London. Are you closer to the United Staets or to England..Explain how you arrived at your answer...

2007-09-03 17:52:25 · 4 answers · asked by Lalo C 1 in Geography

I'm looking for a good word to use for the opposite of agnosia.
A-Gnosis basically is Greek for "non-knowledge", so does anyone know what the Greek for "complete knowledge" is?
Agnosia is commonly used as a suffix or compound word for a lack of ability in certain areas, is there a corresponding suffix/compound for an unusual aptitude in these areas?

Thanks for the help!

2007-09-03 17:51:16 · 4 answers · asked by god_573 1 in Medicine

would 100k volts kill plants that are grounded if the electricity was applied to the top of the plant?

2007-09-03 17:43:32 · 4 answers · asked by Alex 3 in Engineering

2007-09-03 17:42:03 · 8 answers · asked by Anonymous in Astronomy & Space

2007-09-03 17:38:34 · 3 answers · asked by Roo 2 in Earth Sciences & Geology

i believe its an 8 minute delay for what we see from the sun. If you use a telescope, does it cut down on some of the time?

2007-09-03 17:36:28 · 11 answers · asked by swelzba 1 in Astronomy & Space

why the light can go 300,000 km/sec
but the other things can not?
what is the reason?
Do you think one day we will be able to travel about light speed?
and how?

2007-09-03 17:35:58 · 2 answers · asked by Mohsen J 2 in Astronomy & Space

air craft has a lift off speed of 120 km/h
one dimensional motion with constant accel

2007-09-03 17:35:02 · 1 answers · asked by doggydawg 1 in Physics

Say in Australia and New Zealand it's warm in the months we in North America call winter and cold during the months we call summer. so in Australia are bikinis "winter fashions" or do they think of december as "summer time"?

2007-09-03 17:31:51 · 3 answers · asked by der_grosse_e 6 in Weather

What is the Venus'Flower Basket. Is it a plant or an animal? Do u know its name in Vietnamese?

2007-09-03 17:23:28 · 2 answers · asked by Phuong Linh 2 in Botany

2007-09-03 17:18:17 · 8 answers · asked by Aqua 2 in Chemistry

Its the red one with a 3 underneath so its a flammable liquid thats all i know

2007-09-03 17:14:48 · 4 answers · asked by doglover0876 1 in Chemistry

2007-09-03 17:08:51 · 2 answers · asked by Anonymous in Mathematics

What if the entire universe it just one little bity atom, that's a part of something else, and one day we could just cease to exist if the bigger part dies?

2007-09-03 17:06:53 · 10 answers · asked by Anonymous in Astronomy & Space

By improving the power factor,can it really reduce the current flowing through the meter which decides our electrical bill, or doing the job of saving energy?

2007-09-03 17:06:01 · 5 answers · asked by A learner 1 in Engineering

I'm looking for the physiological effects on the body

2007-09-03 17:03:45 · 5 answers · asked by Blaggy_1998 2 in Medicine

kind of like purgatory, where it's just void?? God put it there because he doesn't want us to go beyond it. What if he just put that void there???

2007-09-03 17:01:46 · 11 answers · asked by Anonymous in Astronomy & Space

please help!

2007-09-03 17:00:03 · 13 answers · asked by Giggle Bear 3 in Astronomy & Space