Science & Mathematics - 16 November 2007

y is measured in feet and t is measured in seconds.

Find the acceleration of the particle when t=3

Please show all steps

2007-11-16 08:51:56 · 1 answers · asked by Anonymous in Physics

do you think there is life on this planet? many experts have already said it lies in it's stars habitable zone and it would have had longer to evolve than we have, it's star is one of the oldest in the galaxy, some experts also said "we wouldn't be surprised if there was life on this planet" (or something along those lines)

2007-11-16 08:51:20 · 4 answers · asked by Anonymous in Astronomy & Space

I have a list of elements I need the electron domain and molecular geometries of. I got most of them, but there are a few I am stumped on.
H3O+
XeF4
SF6
SnCl3-

2007-11-16 08:50:36 · 6 answers · asked by Lance 2 in Chemistry

Everyday when I come to this category that's all I see. What do you think??

2007-11-16 08:49:07 · 38 answers · asked by UnboundClouds 5 in Astronomy & Space

creating a lower atmospheric pressure, how would surrounding air move?

2007-11-16 08:47:18 · 2 answers · asked by T 1 in Earth Sciences & Geology

how does a substance, such as glass, become the same temperature of the substance it is being heated or cooled in for about eight to ten minutes?
what is the name of this property?





******ADDITIONAL IF YOU DO NOT UNDERSTAND WHAT I AM ASKING OF YOU**********
if you do not understand the the first part of the question, i have provided an example below:
if i was heating a beaker with glass enclosed in it (through rubber stopping or suctioning) by completely submerging the beaker into the water bath, how does the beaker, then obtain the same temperature as the water bath within eight to ten minutes? could you please make sure to tell what the name of this property is called?





THANK YOU EVER SO MUCH!!!!:)
I OFFER MUCH GRATITUDE TO YOU!

2007-11-16 08:45:49 · 2 answers · asked by Anonymous in Chemistry

Here is the question:

A light is on the ground 20m form a building. A man 2m tall walks directly towards the building at 3m/s. How fast is the length of his shadow on the building changing when he is 8m from the building?

I got ds/dt=20m/s but I am kind of doubting myself since I'm incredibly bad in related rates. Can someone check this over and i'f wrong can please just show me why I'm wrong. Thanks

2007-11-16 08:45:40 · 1 answers · asked by Anonymous in Mathematics

2Ag+ + Zn = 2Ag + Zn2+

Calculate the standard free energy change in kJ/mol for the above cell reaction

2007-11-16 08:45:18 · 2 answers · asked by Anonymous in Chemistry

If you drink salt water, do u achually through up a salt dolphin or what ever? What happens if u drink salt water if that doesn't happen? Give me proof.

2007-11-16 08:44:02 · 8 answers · asked by Anonymous in Other - Alternative

A solid cylindrical disk has a radius of 0.17 m. It is mounted to an axle that is perpendicular to the circular end of the disk at its center. When a 45 N force is applied tangentially to the disk, perpendicular to the radius, the disk acquires an angular acceleration of 90 rad/s2. What is the mass of the disk

2007-11-16 08:39:01 · 1 answers · asked by Anonymous in Physics

The crane is lifting a 180 kg crate upward with an acceleration of 1.2 m/s2. The cable from the crate passes over a solid cylindrical pulley at the top of the boom. The pulley has a mass of 130 kg. The cable is then wound onto a hollow cylindrical drum that is mounted on the deck of the crane. The mass of the drum is 150 kg, and its radius is 0.76 m. The engine applies a counterclockwise torque to the drum in order to wind up the cable. What is the magnitude of this torque? Ignore the mass of the cable.

2007-11-16 08:38:19 · 1 answers · asked by Anonymous in Engineering

How does it relate to mechanical engineering

2007-11-16 08:32:31 · 4 answers · asked by KEYNARDO 5 in Engineering

Russia has coastline on how many oceans?

2007-11-16 08:30:40 · 7 answers · asked by cptnkeyes 3 in Geography

Using Integration, Calculate the Rotational Inertia of a uniform hoop of mass M and radius R about any daimeter
Hint: equation; I = (1/2)MR^2

2007-11-16 08:30:40 · 4 answers · asked by Wonder 2 in Mathematics

Are there any geeks out there planning to celebrate the day before the Hadron Collider is turned on in May 2007 as if it were the last day on Earth?

2007-11-16 08:30:39 · 3 answers · asked by Jack X 2 in Physics

2007-11-16 08:30:32 · 4 answers · asked by alana2005johnson 1 in Zoology

2007-11-16 08:29:13 · 7 answers · asked by Anonymous in Botany

Given:
-height of ramp
-length of ramp
-mass of hoop
-inner and outer radius of hoop
-frictionless

Would my notes acurately predict the time in an ideal-frictionless situation (this is a physics 101 course):


Find Time:

Find α:
Using T=Iα
I=(1/2)M(R^2+R^2)
T=Mg(sinφ)R
Mg(sinφ)R=((1/2)M(R^2+R^2))α
(φ=slope of ramp)
(R's refer to inner
and outer radii)

find θ
d=θR
(d=top of ramp)
(R is outer hoop radius)

find time
θ=(1/2)αt^2

---------
Find ω_final
(ω_f)^2=(ω_i)^2+2αθ

Find final velocity
v_f=(ω_f)*R
(R is outer hoop radius)

2007-11-16 08:28:30 · 1 answers · asked by RogerDodger 1 in Physics

Using Integration, Calculate the Rotational Inertia of a Solid cylinder (or disk) of mass M, radius R, and length L about central axis
Hint: Equation: I=(1/2)MR^2

2007-11-16 08:27:22 · 1 answers · asked by tosinjesu 1 in Mathematics

I'm not good AT ALL with word problems. Writing them as equations and all. Anyway, if you could just show me how to write these following word problems as Quadratic Equations, I can finish them myself. Solve them that is. Here are the questions.


Model each problem with a quadratic equation. Then Solve.

17. Find the length of the side of a square with an area of six hundred and twenty five feet squared. (625 ft^2)

18. Find the radius of a circle with an area of one hundred and fifty three, point eight six feet squared. (153.86 ft^2)

Thanks for any help you can offer!

2007-11-16 08:23:37 · 5 answers · asked by Anonymous in Mathematics

Total ammonia nitrogen in waste water discharges comprises ammonia nitrogen (NH3-N) and ammonium nitrogen(NH4+-N). If pH and temperature of the wastewater discharge are 8 and 25degC, calculate the % of each of thes two forms of nitrogen in the wastewater. K is 1.82 EXP -5

2007-11-16 08:23:00 · 1 answers · asked by Tilly G 1 in Chemistry

what is the....
1.Size
2.Distance from the sun
3.Atmpsphere like
4.Length of its day and a year
5.Density

And what web site did you get the info from???

2007-11-16 08:19:48 · 7 answers · asked by Anonymous in Astronomy & Space

solve 2+Logbase2[x+2]= Logbase2[x]+ Logbase2[x-3]

2007-11-16 08:16:58 · 2 answers · asked by Anonymous in Mathematics

please explain and if you used a website please give url

2007-11-16 08:16:18 · 5 answers · asked by Hitsugaya 1 in Geography

Which planets exhibit retrograde motion, that is, periodically appear to reverse their direction of motion across the sky?
Venus
Mercury
Jupiter
Mars
Saturn

2007-11-16 08:15:41 · 8 answers · asked by Anonymous in Astronomy & Space

what is 485 divided by 16? I need the correct answer and if I dont, I wont pass. So PLEASE I need it right. and PLEASE show work.

2007-11-16 08:12:37 · 3 answers · asked by Anonymous in Mathematics

2007-11-16 08:12:06 · 2 answers · asked by Anonymous in Mathematics

when forming they reach sufficient mass and ignite(fusion)
eg our sun, and blow the rest of the matter out. what then stops that process when giant or super giant stars are forming???

2007-11-16 08:08:44 · 6 answers · asked by Anonymous in Physics

2007-11-16 08:07:49 · 5 answers · asked by Myssie R 1 in Earth Sciences & Geology

2007-11-16 08:07:30 · 15 answers · asked by simon m 2 in Mathematics