Science & Mathematics - 2 December 2007

It is for my A2 physics coursework.

2007-12-02 08:06:41 · 1 answers · asked by bellerby648 2 in Physics

It seems that I'm forgetting the easiest concepts! I know it's got something to do with Angle Addition Postulate or definition or supplementary, but I don't know how to prove it exactly. Any help is much appreciated.

2007-12-02 08:05:55 · 2 answers · asked by Anonymous in Mathematics

breaking strenght of a cord is 44lbs. what's the max freq of revolution of a 8lb weight rotating in a horizontal circle of radius of 9ft.

2007-12-02 08:04:04 · 1 answers · asked by Anonymous in Physics

HELP!!!!!!

2007-12-02 08:01:05 · 4 answers · asked by jeeves 2 in Biology

2007-12-02 08:00:06 · 27 answers · asked by mikey 3 in Paranormal Phenomena

I have a ghost in my house. Last night it chased me out of the kitchen. I was running for my life. What do I do? Does the house need an exorcism?

2007-12-02 07:58:05 · 36 answers · asked by Adam Nathan Zimmerman 2 in Paranormal Phenomena

A=
[-1 0 -5]
[2 -3 -2]
[0 -5 3]

B = [-2] [-3] [4] (Make a column, 3 x 1!)

2007-12-02 07:58:04 · 1 answers · asked by Anonymous in Mathematics

i made a program on my calculator for energy of a photon, because typing in 3 *10^8 and 6.63*10^-34 every second didn't seem very fun. but idk if its exactly right...so i want to check it here. what would the energy of a photon in joules be if it had a wavelength of 6*10^-7. i get 3.315 ^-19. doesnt seem right to me...seems to small.

2007-12-02 07:57:20 · 2 answers · asked by Anonymous in Physics

Does anyone know how to calculate Amplitude when given the velocity function and the mass on a simple harmonic motion with a spring problem?

The velocity equation is: V = (3.60 m/s)sin([(4.71s^-1)t - pi/2])
the springs mass is negligable and there is a .500 kg mass on the end of the spring.

please help. I am so stuck.

2007-12-02 07:57:18 · 2 answers · asked by SpaceTrekkie 3 in Physics

2007-12-02 07:56:33 · 2 answers · asked by iquechx_hize09 1 in Weather

2007-12-02 07:55:59 · 6 answers · asked by Anonymous in Biology

2007-12-02 07:53:52 · 5 answers · asked by iquechx_hize09 1 in Earth Sciences & Geology

are seasons caused by the closeness to the sun?

if true:
why are different places on Earth (in the north and south) the same temp. sometimes?

if false:

what does cause seasons?

2007-12-02 07:53:51 · 7 answers · asked by littlemissclumsy 1 in Astronomy & Space

this is on my Daily Geography and i hate it!!!!!!!

2007-12-02 07:53:42 · 6 answers · asked by xo_Piinkaa_ox 2 in Geography

2 sin2Θ - 7 = 4cscΘ

2007-12-02 07:51:11 · 1 answers · asked by Anonymous in Mathematics

..answer pls thanks...

2007-12-02 07:49:40 · 6 answers · asked by iquechx_hize09 1 in Earth Sciences & Geology

A 9.00kg hanging object is connected, by a light, inextensible cord over a light, frictionless pulley, to a 5.00kg block that is sliding on a flat table. Taking the coefficient of kinetic friction as 0.200, find the tension in the string.

thank u

2007-12-02 07:49:14 · 2 answers · asked by xmoonlight_88 1 in Physics

A 27.1 kg box initially at rest is pushed 2.56 m along a rough, horizontal floor with a constant applied horizontal force of 129.712 N.
The acceleration of gravity is 9.8 m/s2.

(A) If the coefficient of friction between box and floor is 0.418, find the work done by the applied force. Answer in units of J.

(B) Find the work done by the friction in units of J.

(C) Find the change in kinetic energy of the box in units of J.

(D) Find the the final speed of the box in units of m/s

please and thank you to anyone helps, it's truly appreciated :)

2007-12-02 07:47:05 · 3 answers · asked by Catalina 2 in Physics

help ! r equals c over 2 pie.

2007-12-02 07:44:43 · 2 answers · asked by happy k 1 in Mathematics

and what state are yall in?

2007-12-02 07:44:34 · 6 answers · asked by hotty 5 in Weather

I'm not sure how to solve for the velocity of a projectile when the initial and final points are not on the same horizontal level. Any general tips, or an explanation of the answer to the following question would be appreciated. Thanks.

Fizzicks has climbed to a ledge 270 metres above the base of a mountain. Hamilton, standing on level ground, uses his slingshot to send a canteen to Fizzicks, a horizontal distance of 390 metres away. The canteen is launched at an angle of 70 degrees to the horizontal. What should be the launch speed of the canteen?

2007-12-02 07:42:13 · 3 answers · asked by Anonymous in Physics

I argued with my lecturer who insisted that 1.0046 can only be 1.005 if the "4" was to be any odd number. I am confussed, help.

2007-12-02 07:39:34 · 1 answers · asked by ralph O 1 in Mathematics

Onions and potatoes are both root plants, right? And chloroplasts are for turning sunlight into energy, so since there's no sun underground does that mean there are no chloroplasts in onions and potato cells?

They both have parts like shoots and leaves that are above ground, so I guess the chloroplasts are in those parts instead?

Please tell me if my thinking is correct or explain if it's not.

Thank you!

2007-12-02 07:36:04 · 4 answers · asked by Hello! 3 in Biology

like scorpions rattle snakes and stuff like that but in new jersey

2007-12-02 07:34:30 · 5 answers · asked by miera m 1 in Zoology

2007-12-02 07:32:40 · 5 answers · asked by Anonymous in Mathematics

2007-12-02 07:28:21 · 2 answers · asked by Monkjitsu 1 in Physics

2007-12-02 07:27:56 · 1 answers · asked by Monkjitsu 1 in Physics

For Example, the DNA sequence would be:
G-C
A-T
T-A
C-G
A-T

If the RNA pairs on the first side then it would be
G-C
A-U
T-A
C-G
A-U

the other side would be:
C-G
T-A
A-U
G-C
T-A

so does it matter???

2007-12-02 07:27:53 · 6 answers · asked by >t0g3ther< 2 in Biology

Sorry, I asked this question before but it got deleted and I didn't get to write down the suggestions you all gave me!

I'm interested in Astronomy and Physics but I know nothing, so what books would you recommend?

Thanks.

2007-12-02 07:26:41 · 5 answers · asked by I quit...... 1 in Astronomy & Space

Why do scientists accept that random mutations and natural selection indicate that evolution has no purpose, while at the same time they reject that the fine tuning of the universe nature's constants for life does not indicate any purpose? Isn't that contradictory? I think we should accept or reject both, but can not accept one conclusion while rejecting the other.

2007-12-02 07:23:27 · 3 answers · asked by Anonymous in Other - Science