Science & Mathematics - 9 November 2007

2007-11-09 11:05:17 · 5 answers · asked by cody j 1 in Zoology

2007-11-09 11:02:01 · 3 answers · asked by afchica101 1 in Zoology

2007-11-09 11:01:19 · 7 answers · asked by azaa 3 in Astronomy & Space

I mean, what triggers our body to laugh? Why aren't we just amused when something is funny? Is there something that makes us do this?

2007-11-09 10:58:23 · 4 answers · asked by 26242. 2 in Other - Science

A wire carries a current of 5.8 A. How many electrons per second are passing any cross sectional area of the wire? Enter your answer in the format *.**E**. (electrons per second)

2007-11-09 10:58:17 · 2 answers · asked by ariddlegirl 1 in Physics

2007-11-09 10:57:55 · 2 answers · asked by mirage 1 in Zoology

For time t, in hours, 0 t 1, a bug is crawling at a velocity, v, in meters/hour given by the following equation:
V= 1/(0.83 + t)
Use delta t = 0.2 to estimate the distance that the bug crawls during this hour. Find an overestimate and an underestimate. Then average the two to get a new estimate.
meters (overestimate) =
meters (underestimate) =
meters (new estimate) =
Please explain how to do the problem and how you arrived at the answers given.

2007-11-09 10:55:42 · 2 answers · asked by wildcat11 1 in Mathematics

What would the graph of the following equation of a conic section look like?

x^2/9 + y^2/25 = 1

Would it be vertical ellipse, horizontal ellipse, vertical hyperbola, or horizontal hyperbola?



Describe the graph of the following equation:
(x-2)^2/36 + (y-1)^1/36 = 1
Would it be circle with the center in the first quadrant with radius 6, circle with center in the second quadrant with radius 36, circle with center in the third quadrant with raduis 6, or circle with center in the fourth quadrant with radius 36?


Given the equation of the ellipse below, find the local points.

x^2/25 + Y^2/9 = 1
Would it be (5,0) and (-5,0), (4,0) and (-4,0), (0,3) and (0,-3), or (5.83,0) and (-5.83,0)?


Please help me and give me the RIGHT answers. This is a pretest im suppose to do. ive done this class before, but i failed it, and im already suppose to know this stuff im guessing. but i dont. and i need help cause i need to pass this please please please help.

2007-11-09 10:55:26 · 3 answers · asked by Angelkins 3 in Mathematics

Please put atleast 3 important uses.

2007-11-09 10:55:08 · 4 answers · asked by sph95 2 in Chemistry

Please explain

2007-11-09 10:54:53 · 4 answers · asked by Bobby S 3 in Mathematics

How do we know they are cold blooded, I think the title said it all.
If all we have found are fossils, which is all that claims to have been found, how would we possibly know they are cold blooded, it would just be an assumption.

Please only genuin answers.
I am wondering because of other research I am doing.
Thank you so much

2007-11-09 10:43:48 · 3 answers · asked by Anonymous in Zoology

A puck has a mass of 0.260 kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 80.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. (Hint: Consider the change of kinetic energy of the puck.)

2007-11-09 10:35:10 · 1 answers · asked by ? 1 in Physics

A 270 N sphere 0.20 m in radius rolls, without slipping 6.0 m down a ramp that is inclined at 37° with the horizontal. What is the angular speed of the sphere at the bottom of the hill if it starts from rest?

2007-11-09 10:34:20 · 1 answers · asked by ? 1 in Physics

What is the final temperature of a system of iron and water if a piece of iron with a mass of 25g at a temperature of 75C is dropped into an ainsulated sontainer of water at 35.6C? The mass of the water is 150g. The specific heat of iron is 0.449J/g.C, and the specific heat of water is 4.184 J/g.C.

2007-11-09 10:31:06 · 2 answers · asked by STAT1 3 in Chemistry

7^x-3^x

2007-11-09 10:29:49 · 3 answers · asked by samantha 5 in Mathematics

How does the concentration gradient affect the rate at which gas dissolves in a liquid?

2007-11-09 10:28:43 · 1 answers · asked by guesshustler 1 in Chemistry

At 0°C a 1.00 L flask contains 8.40 10-2 mol N2, 5.40 102 mg O2, and NO at a concentration of 9.00 1018 molecules/cm3. What is the partial pressure of each gas, and what is the total pressure in the flask?
PN2 = ____ atm
PO2 = ___ atm
PNO = ___ atm
Ptotal = ____ atm

2007-11-09 10:28:24 · 1 answers · asked by poo 2 in Chemistry

Hi, I'm trying to buy a telescope for a friend as a Christmas gift. Dispite all the reading, I feel completely lost! If someone couple PLEASE just post a guide of decent ranges for whatever qualities ,or name brands I would be forever grateful
Thanks!

2007-11-09 10:28:08 · 7 answers · asked by Igarashinanigans 2 in Astronomy & Space

A sample of nitrogen gas was collected over water at 20.°C and a total pressure of 1.40 atm. A total volume of 2.35 102 mL was collected. What mass of nitrogen was collected? (At 20.°C the vapor pressure of water is 17.5 torr.)

2007-11-09 10:27:34 · 1 answers · asked by poo 2 in Chemistry

Any help would be appreciated!!

In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.0 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the distance between the players before sliding to a halt. What minimum initial speed should the puck have been given so that it reached the teammate, assuming that the same force of kinetic friction acted on the puck everywhere between the two players?

Thanks!

2007-11-09 10:26:09 · 1 answers · asked by frosty 2 in Physics

2007-11-09 10:23:33 · 19 answers · asked by batty_starr 2 in Mathematics

The total pressure of a 200mL sample of oxygen collected over water at 25Celsius is 1.030 atm.
A) How many moles of gas is present?
B) How many moles of oxygen is present?
C) How many moles of water vapor is present?

2007-11-09 10:18:58 · 1 answers · asked by Anonymous in Chemistry

2007-11-09 10:18:03 · 8 answers · asked by Natasha D 2 in Medicine

What actually happened and where can i find information about this if anyone knows.

2007-11-09 10:16:06 · 16 answers · asked by ShullyR 1 in Astronomy & Space

Find the x- and y-coordinates of the center of gravity of a 4.00 ft by 8.00 ft uniform sheet of plywood with the upper right quadrant removed. The dimensions of the cutout are a = 4.90 ft and b = 2.10 ft.
x =____ ft
y = ____ft

2007-11-09 10:14:18 · 2 answers · asked by ? 1 in Engineering

Ive been learning proofs for the past few weeks and I understand how to label the diagrams but I get confused with what step comes next and what th. or postulate goes with it...

2007-11-09 10:09:17 · 2 answers · asked by Samantha M 1 in Mathematics

and im not talking about danger levels im just curious is it a bear? cat? dog? snapping turtle?which one of those dudes is most likely to bite me if i encounter it.... come on you know its a good question

2007-11-09 10:08:51 · 9 answers · asked by Mike L 2 in Zoology

I have a theory that it is hotter and dryer in Africa than in Asia and as the ears are cooling agents, that may be the answer but it is just a theory

2007-11-09 10:08:44 · 7 answers · asked by lizlywatts 4 in Zoology

For any standing wave, how do you find the amplitude at a given point?

2007-11-09 10:06:59 · 2 answers · asked by Anonymous in Physics

The ultrasonic motion sensor sends pulses of ultrasound toward a cart on the low-friction track and determines the distance by the time an echo takes to return. The temperature in the lab is equal to 20 degrees C.

2007-11-09 10:05:05 · 1 answers · asked by triciawin87 2 in Physics