Science & Mathematics - 30 September 2007

1. a monkey hangs stationary at the end of a vertical vine. What two forces act on the monkey? which, if either, is greater?

2. can an object be in mechanical equilibrium when only a single force acts on it ? explain.

3. if you pull horizontally on a crate with a force of 200 N, it slides across the floor in dynamic equilibrium. how much friction is acting on the crate ?

4. what is the definition of support force ?

5. what is the definition of static & dynamic equilibrium ?

please explain your answers - i need answers and the knowledge of how to do the problems on my own as well. thank you !

2007-09-30 16:51:27 · 3 answers · asked by Anonymous in Physics

1. ∀x∃y, x^2 + 1 = y^2

2. ∃y∀x, x^2 + 1 = y^2

3. ∀y∃x x^2 + 1 = y^2

I know what the symbols mean but when they are together determining x and y, it becomes very confusing for me. Can someone give a detailed explantation to me? Thanks!

2007-09-30 16:51:22 · 2 answers · asked by Brian S 1 in Mathematics

please explain

2007-09-30 16:46:50 · 2 answers · asked by asatodaniel 2 in Astronomy & Space

2007-09-30 16:45:38 · 6 answers · asked by soccermom71968 1 in Biology

2007-09-30 16:42:17 · 12 answers · asked by Kampton C 1 in Earth Sciences & Geology

A power boat of mass 450 kg is cruising at a constant speed of 8.9 m/s. The propeller provides a drive force of 745 N. The driver of the boat shuts off the engine, and the boat coasts to a halt. Assume -- contrary to fact -- that the resistive force due to the water is constant, independent of the boat's speed.
How far does the boat coast??
How much time does it take for the boat to come to rest after the engine is turned off??

2007-09-30 16:40:40 · 2 answers · asked by Anonymous in Physics

2007-09-30 16:39:12 · 3 answers · asked by Merbit 2 in Chemistry

2007-09-30 16:37:32 · 12 answers · asked by Anonymous in Astronomy & Space

i am doing a lab trying to find the density of a snickers bar and a 3 musketeers. i am using a snickers, 3 musketeers, triple beam balance, and ruler. what is the independent variable in this experiment? and the dependent variable? i think the dependent variable is the density. what about the controls? thank you! p.s. if u could give me the procedures for the way i would do this experiment would be nice too.

2007-09-30 16:37:25 · 2 answers · asked by Sarah S 3 in Physics

2007-09-30 16:37:23 · 4 answers · asked by otherwisefallen 2 in Earth Sciences & Geology

2007-09-30 16:35:17 · 3 answers · asked by Christa 1 in Physics

2007-09-30 16:32:56 · 3 answers · asked by Freebrum 3 in Biology

2007-09-30 16:32:46 · 10 answers · asked by Anonymous in Mathematics

Why does an increase in temperature increase the rate of exothermic as well as endothermic reactions?

2007-09-30 16:32:34 · 1 answers · asked by Anonymous in Chemistry

I want to go into space and live off earth. Whats the best way of achieving this dream?

2007-09-30 16:32:05 · 6 answers · asked by Chris tf 2 in Astronomy & Space

A rocket moves upward, starting from rest with an acceleration of 31.0 m/s2 for 8.00 s. It runs out of fuel at the end of the 8.00 s but does not stop. How high does it rise above the ground?

2007-09-30 16:29:35 · 2 answers · asked by lala 1 in Physics

say for instance their is a 1.91N block on a 16 degree incline. It is pushed and moves down the board at a constant speed (no accleration) how do I go about calcualting the coefficient of kinetic friction

2007-09-30 16:29:11 · 2 answers · asked by akanthasy 1 in Physics

The number whose digits have a sum of 15 and a difference of 1. This number is not 8 less than 95.

Both digits are odd. The tens digit minus the ones digit is 4. Their sum is 10.

2007-09-30 16:27:16 · 4 answers · asked by Kim Possible 2 in Mathematics

2007-09-30 16:27:11 · 10 answers · asked by Anonymous in Mathematics

Well, I was drawing a line graph for human population growth and they gave some evaluation q's, so what does this one mean?

"Social activists for zero population growth, advisable only reproduction for replacement for the current population, can you give a rational for their position"

What does that mean, and what does it have to do with the bar graph?

2007-09-30 16:24:06 · 7 answers · asked by |♥*/♥\*♥| 3 in Mathematics

I ripped out the answer pages at the back of the book so I wouldn't be tempted to look at the answers and now I've lost them!! Any help would be appreciated, I really need to clarify if my answers are correct!

2007-09-30 16:23:17 · 1 answers · asked by Anonymous in Chemistry

Of the following, a 0.1M aqueous solution of _________ will have the lowest freezing point, and why?
A) Al(NO3)3
B) K2CrO4
C) Na2SO4
D) NaCl
E) sucrose

2007-09-30 16:21:34 · 1 answers · asked by Anonymous in Chemistry

I think it was once mentioned on Mythbusters. I love that show

2007-09-30 16:17:55 · 3 answers · asked by Thomas M 3 in Earth Sciences & Geology

A ball is droppred from a roof and takes 3.0 s to reach the ground. Calculate the elevation of the roof above the ground in meters. (Neglect air resistance)

2007-09-30 16:17:39 · 5 answers · asked by Ice Cube 1 in Physics

2007-09-30 16:15:41 · 7 answers · asked by Anonymous in Physics

All I know is the The Iron Triad is made up of iron, cobalt, and nickel.

2007-09-30 16:14:35 · 1 answers · asked by future Mrs. Nick Jonas :) 1 in Chemistry

my total motor power = 800kw
these motors run under generator supply.
3 phase, 415v, 365A.

how to calculate?

2007-09-30 16:14:20 · 3 answers · asked by muruagappan v 1 in Engineering

Is it me or is the space shuttle Discovery one of the most ghetto looking vehicles in existence? I once owned a twenty year old Toyota that had less Bondo than that crap. OK, maybe it's not Bondo, but damn. The burn marks from the last 6 reentries are still visible & the replacement tiles don't even match the old ones. It's like having your driver side door replaced and never repainting it. Come on, splurge for the Earl Scheib basic shuttle special. At least the get the damned thing one solid color.

Yes, we know that you can't take the sh1t to the shuttle wash or the soap & water might make the tiles fall off. But there has got to be some way to clean it. NASA, have you no shame? Do you want the other space faring nations to mock the jalopy you put-put into space in? You can do a lot better than this. Do you really want to be outdone by the Japanese with this too? Soon we will have rice burner Space craft, & then what will you do? Build a space shuttle escort hatchback edition?

2007-09-30 16:12:57 · 6 answers · asked by Unknown_Usr 4 in Astronomy & Space

Model the volume of the shielding as a function of its thickness. Find the thickness of the shielding, to the nearest centimetre, if the volume of the shielding is 3m^3.

2007-09-30 16:12:22 · 1 answers · asked by Nahata A 1 in Mathematics

what does it mean.... between people and friends just not relationships

2007-09-30 16:12:04 · 1 answers · asked by Anonymous in Chemistry