Science & Mathematics - 12 November 2007

please help me with my homework!?!?

2007-11-12 15:18:27 · 8 answers · asked by candybar1234 2 in Physics

help with homework please i cannot find it in my textbook.

2007-11-12 15:15:48 · 4 answers · asked by candybar1234 2 in Physics

Given: Two chairs--> Silicon (lower specific heat) and Alumninum (higher specific heat)

Which would you more likely sit upon while wearing shorts in the hot sun? And why?

2007-11-12 15:14:37 · 1 answers · asked by Anonymous in Physics

a 105 kg football player running due north at a speed of 9.5 m/s is tackled by an 80 kg player running in a direction 150 degrees east of north at a speed of 9 m/s. The collision occurs on wet Astroturf (astro-glass)so you can ignore friction.

a.) In what direction do the entangles players move after the collision?

b.) At what speed do they move after the collision?

Please give explainations for your answers. Thanks.

2007-11-12 15:14:27 · 1 answers · asked by chellysea33 2 in Physics

2) how does a change in speed cause a wave to change direction
3)what are two types of interference
4)what determines the amplitude of a wave produced by interference
5)wave A has the same amplitude as wave B what will happen when a crest of wave A meets a trough a wave B
6)what is a standing wave
7)how does nodes and antinodes form in a standing wave

2007-11-12 15:13:58 · 1 answers · asked by Anonymous in Other - Science

If I go to acupuncturist , they tell me which part of the body is not functioning right.. can the acupuncturist telll whether the patient had heart attack or stroke by checking the pulse?? they are known to tell which part is not functioning by checking the pulse...

2007-11-12 15:13:28 · 3 answers · asked by John's Prayer 1 in Medicine

2007-11-12 15:13:01 · 1 answers · asked by bricklayer978 1 in Mathematics

1) A bob of mass 120 g is hanging from a string of length 25 cm. What is the period of the pendulum?
2) If you wanted to double period of the pendulum, what should you do?
A) Quadruple the length of the string.
B) Double the length of the string.
C) Double the mass.
D) Halve the length of the string.
3) Consider the equation for the period of a pendulum. In a plot of T2 vs. l you will get a straight line. The slope of the line is given by
A) 4pi2/g
B) g1/2
C) 2pig1/2
D) 2pi/g
4-) All clocks used to keep time by the swinging of a pendulum which had a period of 1 second. If one of these clocks were taken to the moon, how would the time kept by the clock change?
A) The moon clock would run slower than the earth clock.
B) The moon clock would run faster than the earth clock.
C) It would depend on spring constant of the pendulum.
D) The moon clock would keep the same time as the earth clock.

2007-11-12 15:11:05 · 2 answers · asked by Natiphy2007 1 in Physics

you are pulling a 10 pound kayak over ice. you are exerting 2 pounds of force on the rope that you are pulling connected to the front of the kayak, the angle of the rope to the horizontal is 25 degrees... how would you determine the coefficient of friction here and what is it?

Best Answer to first correct response

2007-11-12 15:07:09 · 2 answers · asked by Anonymous in Physics

I need an answers PLZ!

2007-11-12 15:06:46 · 6 answers · asked by esterlina s 1 in Other - Science

Both pills have 25mg of Diphenhydramine HCI as their active ingrediant, and only a few differences in their inactive ingreadiants. In a nutshell, they look basicly like the same thing when I compared the backs to both boxes. So is there really no difference, just different names for it? I dont get it. Is it in my head that they dont feel like the same thing when i think about it? hmmm...someone some feedback please!

2007-11-12 15:06:18 · 5 answers · asked by Anonymous in Medicine

... How long would it take for the to complete the job if they were working together?

2007-11-12 15:03:24 · 8 answers · asked by bricklayer978 1 in Mathematics

2007-11-12 15:01:43 · 5 answers · asked by bricklayer978 1 in Mathematics

How do I put 2(y-1) = 3y+4 into Y=MX+B format??


Thanks!!

2007-11-12 14:56:59 · 6 answers · asked by dts_1992 2 in Mathematics

There were many govt. (some former) officials etc.were there who had seen ufos and they were discussing them. Of course...a skeptic was on tv saying they only saw lights. They brought up that one person had touched a ufo. At least they are "openly" discussing these sightings.What did you think about it.?

2007-11-12 14:56:50 · 9 answers · asked by Deenie 6 in Paranormal Phenomena

2007-11-12 14:51:48 · 5 answers · asked by aminer_lover90 1 in Mathematics

is it a change in DNA sequence but no change in protein sequence, or is it a change in genotype but no change in phenotype?

2007-11-12 14:50:19 · 0 answers · asked by urox555 2 in Biology

Bug, insect, reptile (like a black widow or a venomous snake)

2007-11-12 14:44:53 · 7 answers · asked by Anonymous in Zoology

A weather balloon is designed to expand to a maximum radius of 20 m at its working altitude, where the air pressure is .030 atm and the temperature is 200 K. If the balloon is filled at atmospheric pressure and 300 K, what is its radius at liftoff?
All I have is PV=nRT and I really don't know where to go with that...

2007-11-12 14:44:48 · 4 answers · asked by Anonymous in Physics

a) the wavelength of the sound

b) the pitch of the sound

c) the amplitude of the waves

d) the medium

2007-11-12 14:44:42 · 1 answers · asked by XOXO 1 in Physics

2007-11-12 14:42:10 · 1 answers · asked by Sarah 1 in Geography

A force of 27.0 N is required to start a 3.9 kg box moving across a horizontal concrete floor.
(a) What is the coefficient of static friction between the box and the floor?

(b) If the 27.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction?

2007-11-12 14:39:14 · 2 answers · asked by roofchelsea 1 in Physics

(a) What is the speed of the transverse string waves?
(b) What is the tension?
(c) What are the wavelength and frequency of the sound wave in air produced by vibration of the string? The speed of sound in air at room temperature is 340 m/s.

What I did didn't work so now I'm confused. Help me out if you can. Thanks!

2007-11-12 14:39:07 · 2 answers · asked by anjelle_2 1 in Physics

Br2
PCl3
LiCl
CiF
MgCl2

2007-11-12 14:35:11 · 4 answers · asked by jamie d 2 in Chemistry

2007-11-12 14:34:39 · 5 answers · asked by Mary Bby ♥ 2 in Other - Science

In a game of dice where your opponent has one die and you have another, the winner is the higher number (you each get to roll once).

There are 4 dice...
Die A: four 4's and two 0's
Die B: six 3's
Die C: four 2's and two 6's
Die D: three 5's and three 1's

If the opponent gets to pick the first one (unknown), which should you pick to win?
Why?

2007-11-12 14:33:20 · 2 answers · asked by Anonymous in Mathematics

I'm looking to have a rapid prototype made for a product I'm working on. I can't seem to locate the resources online. I'm thinking either CNC machined from plastic? Maybe one of those laser prototyping machines with the vat of liquid? Heck, even a plastic printer? Any ideas anyone!

2007-11-12 14:32:49 · 5 answers · asked by rdylina 2 in Engineering

please i would love to know!!! :D

2007-11-12 14:29:43 · 1 answers · asked by coastguardluvr 2 in Physics

Three objects of equal mass (m) each are located on a corner of a square length L
What is the gravitational field on the fourth corner with no mass due to theses objects?


m1---------------m2
|..........................|
|..........................|
|..........................|
X-------------------m3

{<-------L------->}

2007-11-12 14:29:03 · 1 answers · asked by MeNeedHelp 2 in Physics

2007-11-12 14:28:39 · 5 answers · asked by sharayah b 1 in Mathematics