Science & Mathematics - 24 October 2006

.....In relation to a question i read that had already been answered.

Have you heard the theory about aliens having a humanoid form because that is the most energy efficient form (through evolving) for a bi-ped on a globe with gravity ?

Strangely worded question as i didnt want to answer a question already posted and so i invite thoughts on this theory which is not my own.

2006-10-24 03:17:31 · 8 answers · asked by m c 2 in Astronomy & Space

a man who weighs 180 pounds is lifted 200 feet by an elevator. how much work does the elevator do on the man? how much work does the gravitational force do on the man?

2006-10-24 03:16:56 · 2 answers · asked by Chris D 1 in Physics

2006-10-24 03:12:26 · 6 answers · asked by dannygwenz 2 in Other - Science

What is the physical significance of 2nd derrivative?

1st derrivative tell the slope of the cure!! so 2nd meand it will tell the slope of slope of the curve??

2006-10-24 03:10:59 · 6 answers · asked by Adi 1 in Mathematics

2006-10-24 03:10:53 · 4 answers · asked by lauren s 1 in Chemistry

We are told that the waves are generated due to
1. Earth's Rotation 2. Moon's Gravitational force
Then, all this should make waves even in ponds or lakes. Is it that due to it's very small amplitude and frequency that we do not see or feel them physically?

2006-10-24 03:07:51 · 6 answers · asked by viji_sampath2000 2 in Earth Sciences & Geology

Which of the following features is formed by rivers and streams as they erode the land?


Plicking
Valleys
Mendicant
Slippage

2006-10-24 03:06:03 · 3 answers · asked by Anonymous in Earth Sciences & Geology

(sites)

2006-10-24 03:05:53 · 2 answers · asked by shani 2 in Biology

I know it will be an "or" .. just messed up somewhere in my arithematic

2006-10-24 03:05:38 · 10 answers · asked by Anonymous in Mathematics

in one or two sentences, explain what mechanical work does to an object.

2006-10-24 03:04:17 · 2 answers · asked by Chris D 1 in Physics

2006-10-24 03:03:15 · 12 answers · asked by the guy 1 in Mathematics

2006-10-24 03:03:02 · 5 answers · asked by Anonymous in Other - Science

2006-10-24 03:02:28 · 4 answers · asked by Kendra H 1 in Chemistry

A piston decreases the volume of a cylinder filled with gas Y. What happens to the pressure of gas Y? Is there a way that the pressure could be held constant?

2006-10-24 02:59:57 · 2 answers · asked by Anonymous in Chemistry

Why are headland eroded faster than the land at the land at the end of the inlets and bays? One of these answers are crrect, but which one??

Ships docking in the harbors hit them more often.
They are given the concentrating energy of the wave action.
They are made of softer material.
They are usually hit by several hurricanes yearly.

2006-10-24 02:56:57 · 1 answers · asked by Anonymous in Earth Sciences & Geology

2006-10-24 02:56:50 · 3 answers · asked by Naddi S 1 in Physics

Have 2 containers same size filled with equal amounts of gas X. One container is rigid the other is flexible. What will happen if each containers is placed in an oven 400 degrees Fahrenheit for 10 min.

2006-10-24 02:56:42 · 3 answers · asked by Anonymous in Chemistry

record that is 12 in in diameter. The record moves from rest to its final angular speed in
2.91 s.

What is the bug's centripetal acceleration 1.5 s after the bug starts from rest (in m/s^2)?
1 in. = 2.54 cm

2006-10-24 02:47:22 · 1 answers · asked by Dee 4 in Physics

Show that if the remainder of c divided by d is 1, then the same is true for the remainder of c^2.

2006-10-24 02:43:55 · 4 answers · asked by Psychic K 1 in Mathematics

Mary's and Bob's ages combined are twice Jane's age. Mary is 8 years older than Bob. Jane's age plus Bob's age is 20 years. How old are they?

2006-10-24 02:42:38 · 6 answers · asked by Sasha 2 in Mathematics

Prove, stating the proof technique that you are using.
Direct proof
Contrapositive proof or
Contradiction

2006-10-24 02:42:21 · 2 answers · asked by Psychic K 1 in Mathematics

I'm not looking for the closed in furnace kind, and it must be electric

I'm beginning constuction of a Down's Cell and I need buy the heating element so I can decide on the diameter

Only helpful answers please

2006-10-24 02:42:11 · 2 answers · asked by Anonymous in Engineering

2006-10-24 02:41:51 · 5 answers · asked by Anonymous in Chemistry

2006-10-24 02:41:07 · 23 answers · asked by the guy 1 in Mathematics

2006-10-24 02:40:03 · 2 answers · asked by yanesh_r 1 in Mathematics

2006-10-24 02:38:15 · 4 answers · asked by yanesh_r 1 in Mathematics

A boy whose mass is 35kg and a girl at 25kg face each other initially at rest on frictionless rollar skates. The boy pushes the girl, who moves away at a speed of 1.5 m/s. Whats the boys speed?

I used the elastic collison equation:
V1f = (35-25/35+25)0 + (2(25)/35+25)1.5
V1i = (50/60)1.5
V1i = (.83)1.5
V1i = 1.25 m/s



am I close??

2006-10-24 02:26:28 · 5 answers · asked by Haley 2 in Physics

2006-10-24 02:17:56 · 2 answers · asked by Abdo 1 in Chemistry

ok... as an easy homework exercise we proved that

p = 1 (mod 4); p = 3 (mod 4)

both have infinite numbers of primes as solutions. clearly,

p = 2 (mod 4); p = 0 (mod 5)

each have 1 prime as a solution, and

p = 0 (mod 6)

has no primes as a solution.

my question is: is there any congruence that has other than 0, 1, or infinite primes as a solution set? if not, is this easily proved?

2006-10-24 02:17:40 · 4 answers · asked by Anonymous in Mathematics

2006-10-24 02:17:19 · 13 answers · asked by Intrigue 1 in Astronomy & Space