Science & Mathematics - 28 August 2007

0 ⤊

direction in radians please?

A child walks due east on the deck of a ship at 3 miles per hour.
The ship is moving north at a speed of 12 miles per hour.

Find the speed and direction of the child relative to the surface of the water.

2007-08-28 13:43:56 · 1 answers · asked by wvlilgurl 1 in Physics

0 ⤊

can you help me identify these?

Identify the role of the following in the cell cycle clock

a. Kinase
b. Cyclin
c. CDKs

2007-08-28 13:43:36 · 1 answers · asked by Anonymous in Biology

0 ⤊

i found the speed i need to find the direction?

A child walks due east on the deck of a ship at 3 miles per hour.
The ship is moving north at a speed of 12 miles per hour.

Find the speed and direction of the child relative to the surface of the water.

2007-08-28 13:41:38 · 3 answers · asked by wvlilgurl 1 in Physics

1 ⤊

The fizzing in a soft drink is due to?

a. oxygen dissolved in liquid

b. alcohol in liquid

c. carbon dioxide dissolved in liquid

d. liquid changing to a gas

2007-08-28 13:41:37 · 6 answers · asked by Josh 2 in Chemistry

0 ⤊

Can some one please help me. 25% of 320 is??? and then I have to round to the nearest hundredth?

2007-08-28 13:41:29 · 10 answers · asked by marym 1 in Mathematics

9 ⤊

how many significant figures does 45.00 have?

2007-08-28 13:37:48 · 7 answers · asked by Anonymous in Mathematics

1 ⤊

(t^2)^-1/2 would equal t^?

2007-08-28 13:34:22 · 6 answers · asked by Fibonacci01123 3 in Mathematics

0 ⤊

please answer below...it is very complicated and i am having trouble!?

Memory on electronic storage devices is measured in bytes, or in larger units such as kilobytes (kB), megabytes (MB), or gigabytes (GB). Suppose a floppy disk has a memory capacity of 1440 kB.

a - If a CD (compact disc) has a memory capacity of 600 MB, then compared to the floppy, how many times as much memory capacity does the CD have?

b - If a DVD (digital video disc or digital versatile disc) has a memory capacity of 4.7 GB, then compared to the CD, how many times as much memory capacity does the DVD have?

i would really appreciate the help...thanks so much!!!

2007-08-28 13:33:52 · 4 answers · asked by Anonymous in Mathematics

0 ⤊

Do Aliens Use Radio Waves?

Well we all I think, know about seti .
search for extra..blah blah.
but how do we know that they use the same method as us to communicate.
we use am,,,fm,,,digital...etc
I wonder sometimes if the seti team has got this right.
you know what if they are transmitting but in a different kinda format not like ours.
also I'd love to know what frequencies that the seti team are covering..
ok they say they are covering millions of channels but are they not stuck to certain wavelengths...?

2007-08-28 13:31:34 · 14 answers · asked by emc.squared 1 in Astronomy & Space

0 ⤊

question about the pythagorean identity?

does 1+cos^2X simplify into anything?

2007-08-28 13:30:04 · 1 answers · asked by Fibonacci01123 3 in Mathematics

5 ⤊

The perimeter of a rectangle is 34 cm.?

Given that the diagonal is of length 13 cm, and that the width is x cm, derive the equation of x^2-17x+60=0. Hence find the dimensions of the rectangle.

2007-08-28 13:29:19 · 6 answers · asked by nidya 1 in Mathematics

2 ⤊

Can you solve for b in h = (-b/2a)?

2007-08-28 13:27:47 · 3 answers · asked by Anonymous in Mathematics

3 ⤊

how to be open minded in realtion ships?

2007-08-28 13:26:06 · 11 answers · asked by lisa 1 in Astronomy & Space

0 ⤊

Help with Physics Problems..?

Can somebody help me with these problems? Totally confused.
First it says, "Useful Formula: v = (Triangle)s / (triangle)t
I dont know what the triangle means either.. Then the questions.

1. A car drives down the road 4km in .10 hours. What is its velocity in meters per second?

2. A skater has a velocity of 10.0 m/s. How much time will it take for the skater to go 200.0 m?

3. It takes light a time of 8.3 minutes to travel from the sun to the Earth. If the velocity of light is 3.00 x 10^8 m/s, what is the distance from the Earth to the sun.

4. A pitcher throws a fastball at 160 km/hr. How much time will it take to reach the plate just 18.4m away?

Please provide explanations if you intend to answer! MUCH APPRECIATED!

2007-08-28 13:24:36 · 3 answers · asked by stevendaox 1 in Physics

0 ⤊

My head is hurting because of this math problem...........?

a line passes through a( 3,7), b (-4,9). find the value of a if c(a,1) is on the line.

also please help me on this one:
the product of the slopes of two nonvertical perpendicular lines is always -1. Is it possible for two perpendicular lines to both have positive slope? explain.

thank you!will pick best answer.

2007-08-28 13:24:29 · 3 answers · asked by Ballerina 5 in Mathematics

0 ⤊

Is gravitational acceleration the rate at which things fall, or the rate at which things speed up?

for instance, if i drop a ball, would it instantly reach 9.8mps2 (assuming there is no air resistance) or will its speed increase by that each second. could you please site sorces, this is an argument and my mom is a skeptical person

2007-08-28 13:23:42 · 4 answers · asked by timnuoa 2 in Physics

1 ⤊

Math Help!!!!!?

Can anyone help me with this problem?
-3(2x+1)=2(x-2)

2007-08-28 13:23:03 · 12 answers · asked by 2cute 1 in Mathematics

0 ⤊

How Would you solve this equation?

6n=2/3(5n-2)

i think this is hard and i dont know what to do please help!!

2007-08-28 13:22:45 · 2 answers · asked by DaYrØn™ 2 in Mathematics

0 ⤊

Help w/ Explanation of Basic Physics Dimensional Analysis Problem?

I'm having difficulty understanding the steps involved in solving a basic physics question I was assigned. The answers for this is in the back of the book, but I want to really understand how it was derived.

1. Use dimensional analysis to find acceleration as a function of velocity (m/s), and radius in an object moving at a constant speed around a circle of radius r. The SI unit of acceleration is m/s^2.

The answer is acceleration = K v^2/r
Where K is a dimensionless constant.

How do I come up with this? Where do I start, and how do I know I have K? Can the value of K be determined somehow?

Thanks!

2007-08-28 13:22:05 · 2 answers · asked by LearnChem 1 in Physics

18 ⤊

what is the air speed velocity of a sparrow ?

2007-08-28 13:20:07 · 9 answers · asked by surfcastjunkie 1 in Earth Sciences & Geology

1 ⤊

what is the gestation period of common rats?

2007-08-28 13:19:58 · 4 answers · asked by Neil R 3 in Zoology

0 ⤊

physics help?

speedy sue, driving at 30.0 m/s, enters a one-lane tunnel. she then observes a slow-moving van 155m ahead traveling at 5.00m/s. Sue applies her brakes but can accelerate only at -2.00m/s because the road is wet. Will there be a collision? If yes, determine how far into the tunnel and at what time the collision occurs. If no, determine the distance of closet approach between Sue's car and the van.

2007-08-28 13:19:39 · 1 answers · asked by bob b 2 in Physics

0 ⤊