Science & Mathematics - 9 September 2007

A biologist is studying the growth of rats in an orbiting space station. To determine a rat's mass, she puts it in a 305 g cage, attaches a spring scale, and pulls so the scale reads 0.46 N. If the resulting acceleration of the rat and cage is 0.35 m/s2, what is the rat's mass?

2007-09-09 04:57:13 · 1 answers · asked by dsgdh 2 in Physics

what is the answer ?

2007-09-09 04:56:46 · 12 answers · asked by samir s 1 in Mathematics

A 4000 kg jet touches down at 240 km/h on the deck of an aircraft carrier, and immediately deploys a parachute to slow itself down. If the plane comes to a stop in 155 m, what is the average force of air on the parachute? Assume the parachute provides essentially all the stopping force.

2007-09-09 04:55:14 · 1 answers · asked by dsgdh 2 in Physics

As I'm doing chemistry homework, which includes looking at the electron configuration, I see that Lithium has [He] 2s1. What does it mean?

2007-09-09 04:51:55 · 2 answers · asked by Mizuki K 2 in Chemistry

Or not simple. It doesn't really matter, just someone help me!

I haven't taken an algebra course for a few years (I've been on a gemoetry course for about 2) and now I need to know how to factor for my homework.

Here are the questions:

1. 25x^2-16y^2
2. 3x^2+20x+25
3. 3x^3-39x^2+120x

Even if you can't explain them, if you culd list the steps to get the answer I'll be able to figure it out. Thank you so much!

2007-09-09 04:51:49 · 1 answers · asked by romance@short notice. 2 in Mathematics

2007-09-09 04:51:41 · 3 answers · asked by °æÁø À 1 in Engineering

The cost of 4 L of oil and 50 L of gasoline is $42.50. The cost of 3 L of oil and 35 L of gasoline is $30.30. Determine the cost of oil and 1 L of gasoline.

2007-09-09 04:48:32 · 4 answers · asked by Anonymous in Mathematics

Ethanol into Ethanoic acid.

Like teperature, pressure, whether you need to distil etc.

Thanks

2007-09-09 04:46:07 · 1 answers · asked by C4 Snake 3 in Chemistry

2007-09-09 04:45:57 · 3 answers · asked by Anonymous in Earth Sciences & Geology

A hawk is flying horizontally at 20.0 m/s in a straight line, 240 m above the ground. A mouse it has been carrying struggles free from its grasp. The hawk continues on its path at the same speed for 2.00 s before attempting to retrieve its prey. To accomplish the retrieval, it dives in a straight line at constant speed and recaptures the mouse 3.00 m above the ground.
Q: Assume no air resis, find diving speed. And what angle with horz during decent.

I got the time the mouse had until the hawk caught him again: 6.96 seconds

2007-09-09 04:43:20 · 1 answers · asked by ひいらぎ 5 in Physics

<<<8th grader who needs help with hw

2007-09-09 04:42:30 · 2 answers · asked by 85722 1 in Earth Sciences & Geology

i need help with my hw

2007-09-09 04:40:59 · 1 answers · asked by 85722 1 in Earth Sciences & Geology

2007-09-09 04:40:45 · 2 answers · asked by nathella 1 in Earth Sciences & Geology

2007-09-09 04:40:21 · 6 answers · asked by key 2 in Mathematics

2007-09-09 04:39:57 · 1 answers · asked by Anonymous in Engineering

A meterstick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with those two fingers. You can calculate your reaction time from the distance the meterstick falls, read directly from the point where your fingers grabbed it.

If the measured distance is 18.1 , what is the reaction time?

The correct answer involves the variable g.

2007-09-09 04:39:40 · 1 answers · asked by M C 1 in Physics

1.Cindy's cell phone company charges $0.15 for ea. min. of a call.If she was charged a total of $12.60 for calls in the mo. of June,how many mins. had she used the phone that mo.? My answer is 84 mins.
2. Sarah drives from point a to point b at an average speed of 55 miles per hr. If the distance is 135 miles, how long will the trip take? My answer: 2 1/2 hrs.
3.A cake recipe serves 4 people,and calls for 1.5 cups of flour and 2.5 cups of sugar. Andre searches his cupboards and finds 3.5 cups of flour and 10.25 cups of sugar. If he uses the recipe to bake the largest cake possible with these ingredients,how many people will it serve? My answer: is 8 people,because he can only double the recipe once cause he doesn't have enough flour to double it a third time.

2007-09-09 04:36:25 · 2 answers · asked by A S 1 in Mathematics

2007-09-09 04:36:02 · 2 answers · asked by Victor Dang(520) c 1 in Physics

need to know what is best chart pareto or time or pie for the ?. the number of students enrolled at a local college for each year during the last 5 years.

2007-09-09 04:29:12 · 2 answers · asked by deidre m 1 in Mathematics

If a black hole can suck up light. And we measured light at this spacific spot in the unavers. Why can't light go faster to the infanit the farther it moves from mass. Like the edg of the big bang.

I belive the speed of light is determind by the presince of mass and their is no exact answer. Can some one chang my thought.

2007-09-09 04:27:42 · 6 answers · asked by Shade tree 3 in Astronomy & Space

1.x/x+xy=x/xy
2. 3x^2+6x/3x^2+9x=1x+2/1x+3
3.x^2+2x+1/x+1=1
4.x^2+3x-18/2x-6=x+9/x-3
5.2x^2-4x-6/x-3=2x-3/x-3

2007-09-09 04:26:39 · 3 answers · asked by A S 1 in Mathematics

charlie doofus has a swimming pool that can be filled in 6 hours and drained in 15 hours. how long will it take to fill up the pool if doofus forgets to close the drain valve?

2007-09-09 04:24:36 · 1 answers · asked by araposo185 2 in Mathematics

if one star(our own sun) can cause daylight then surely millions of stars should be able to illuminate the nightsky

2007-09-09 04:20:08 · 16 answers · asked by Anonymous in Astronomy & Space

Suppose you were the first person to have found the glacial grooves in south-eastern South America. From where would it seem the glacier came? I don't understand that question plz help me. then it has this one after it which i don't get either.
Could the glacier have come from the ocean? Explain you answer.

Help me plz!! I"m trying to understand. but this is hard to me!

2007-09-09 04:19:31 · 6 answers · asked by HollyW 1 in Earth Sciences & Geology

9|x + 3| -2 > 43

2007-09-09 04:18:41 · 9 answers · asked by brooklynchyck808 3 in Mathematics

2007-09-09 04:11:19 · 6 answers · asked by Anonymous in Astronomy & Space

A small map shows Pittsburgh to be 343 miles in a direction 23° north of east from Louisville. The same map shows that Detroit is 209 miles in a direction 48° west of north from Pittsburgh. Assume a flat earth and use the given information to find the displacement from Louisville to Detroit.

What is the magnitude and the direction?

2007-09-09 04:09:54 · 3 answers · asked by dazedandconfused 2 in Physics

j

2007-09-09 04:09:41 · 4 answers · asked by hajira m 1 in Chemistry

its for homework

2007-09-09 04:04:30 · 6 answers · asked by Anonymous in Medicine

2007-09-09 04:04:29 · 5 answers · asked by barry l 2 in Geography