Science & Mathematics - 9 October 2007

sin^4 x + sin^4 (x + 45) sin^4 (x - 45) = 9/4

thanks for the help

2007-10-09 13:35:24 · 1 answers · asked by chumme 1 in Mathematics

what causes great and lesser air friction? Explain.. i need help on my homework.. PLEASE!

2007-10-09 13:33:45 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Light travels at a speed of 3.00 x 10 ( to the power of 10 ) cm/s. What is the speed of light in kilometers per hour?

I tried to solve this by changing units but got confused by the exponents. The answer is 1.08 x 10 (to the power of 9) km/hr but how do they get this?

2007-10-09 13:31:52 · 3 answers · asked by Krumpits&Tea☺ 2 in Mathematics

I need a website that explains the physics behind shuffleboard. Does anybody know of any, or can they find any?

2007-10-09 13:31:37 · 2 answers · asked by Cheezer H 1 in Physics

Heres the Question

Formation of Precipitation in cold clouds is called the _______________ process.

2007-10-09 13:30:56 · 3 answers · asked by Anonymous in Weather

2007-10-09 13:28:47 · 5 answers · asked by Anonymous in Engineering

the velocity of a car is reduced by 40.0 m/s for every second that brakes are applid. If the car i initially moving at the rate of 60.0 m/s how long will it take the car to stop?

what formula do i use ?

thanks =)

2007-10-09 13:28:05 · 1 answers · asked by mya<33 1 in Physics

Is it x = .1 ?

2007-10-09 13:27:59 · 12 answers · asked by shawna 2 in Mathematics

A) 1
B) 5
C) 3
D) 7

How did you get your answer?

2007-10-09 13:22:59 · 2 answers · asked by Anonymous in Mathematics

2007-10-09 13:20:59 · 5 answers · asked by Anonymous in Biology

Figured id take a shot. If anyone can help with the physics problem it would be much appreciated!Thanks

Two circuits (the figure below) are constructed using identical, ideal batteries (emf = ) and identical lightbulbs (resistance = R). If each bulb in circuit 1 dissipates 5.0 W of power, how much power does each bulb in circuit 2 dissipate? Ignore changes in the resistance of the bulbs due to temperature changes.

-----------------
l---------------l
l---------------l
-----(+)--------l
----(-)---------R
l--------------l <----- Circuit 1
l--------------l (Resistors are in series)
l--------------R
l --------------l
__________________
l---------------l---------------l
l-----(+)-------l--------------l <---- circuit 2
l---(-)----------l---------------l (Resistors are in parallel)
l------ Resistor---- Resistor
l---------------l---------------l
l---------------l---------------l

2007-10-09 13:18:31 · 2 answers · asked by fikltheyr 1 in Physics

I'm having trouble with this type of math, but before you read the rest, I DON'T JUST WANT AN ANSWER!!!
I want someone to explain every step of how to do this.
Also, please explain why you do something

Find the variable:

3n-2
------
5

equals

7
----
10

those are fractions by the way

2007-10-09 13:15:21 · 5 answers · asked by supertaters 2 in Mathematics

2007-10-09 13:13:43 · 3 answers · asked by Anonymous in Astronomy & Space

2007-10-09 13:13:06 · 1 answers · asked by Anonymous in Physics

35x^3y^4 - 60x^4y

2r^3 + 250

100m^8 - 9

162x^6 - 98

2007-10-09 13:11:40 · 1 answers · asked by koolkid23 2 in Mathematics

2007-10-09 13:06:35 · 1 answers · asked by funnypun 2 in Physics

2007-10-09 13:04:48 · 4 answers · asked by Anonymous in Chemistry

A 1.52 kg bottle of vintage wine is lying horizontally in the rack. The two surfaces on which the bottle rests are 90.0° apart, and the right surface makes an angle of 45° with respect to the ground. Each surface exerts a force on the bottle that is perpendicular to the surface. What is the magnitude of each of these forces?
____

2007-10-09 13:03:01 · 1 answers · asked by Marianna E 1 in Physics

Two identical massless springs are hung from a horizontal surface. A block of mass 1.5kg is suspended from the pair of springs. The accel of grav is 9.81 m/s^2.
When the block is in equilibrium, each spring is stretched an additional 0.54m.
The force constant for EACH spring is?

I tried working this out myself, but would like other feedback.

F = (k)(x)
The only force acting on the springs is the weight of the block.
And x is given, 0.54m, by the stretching of the strings.

(1.5kg)(9.81m/s^2) = (k)(0.54m)

thus k = 27.25 BUT here is where i became confused, as their are two springs, would the force constant be half?? (seeing how the question is "What's the force constant of EACH spring?")

so, k1 = 27.25/2 = 13.625

Feedback Please!

2007-10-09 13:02:00 · 1 answers · asked by Anonymous in Physics

The drawing shows a large cube (mass = 22 kg) being accelerated across a horizontal frictionless surface by a horizontal force P. A small cube (mass = 2.8 kg) is in contact with the front surface of the large cube and will slide downward unless P is sufficiently large. The coefficient of static friction between the cubes is 0.71. What is the smallest magnitude that P can have in order to keep the small cube from sliding downward?
____N

2007-10-09 13:00:31 · 1 answers · asked by Marianna E 1 in Physics

2007-10-09 12:55:14 · 2 answers · asked by Anonymous in Chemistry

2007-10-09 12:53:52 · 11 answers · asked by B@BY_FL@SH R 1 in Weather

please help!!!!!!!!!!!!

2007-10-09 12:53:16 · 7 answers · asked by ajaaland 1 in Geography

2007-10-09 12:53:12 · 2 answers · asked by Anonymous in Mathematics

2007-10-09 12:52:59 · 8 answers · asked by Tommy J 1 in Mathematics

what is the product of an alkane and an acid?

(2-chlorobutane + phosphoric acid.)

2007-10-09 12:47:42 · 1 answers · asked by C'est Comme Un Rêve 3 in Chemistry

I'm working on inverses and verifying that they work.. this is one of the three equations I have a question on.

2007-10-09 12:46:32 · 4 answers · asked by darlingdork 1 in Mathematics

After 15% sale & 7% tax, your bill for a suit is $75. What was the retail price?

i completely forgot how to solve problems like this, but for some reason i have the urge to do 15%-7%= 8% which is probably wrong.
anyways, can someone explain to me how to solve this?
thanks

2007-10-09 12:45:32 · 4 answers · asked by ♥ 2 in Mathematics

Do you believe in all the predictions for Dec. 12 2012? Like the polar shifts and end of the world as we know it?

2007-10-09 12:45:26 · 55 answers · asked by christina b 1 in Earth Sciences & Geology

Attach a good website if you got one.

2007-10-09 12:40:14 · 15 answers · asked by Beyondaverage B 2 in Astronomy & Space