Science & Mathematics - 6 December 2007

Anybody know how to do this? I need help/ an answer ASAP! THANKS (:

2007-12-06 16:35:34 · 2 answers · asked by Anonymous in Physics

A box rests on the (horizontal) back of a truck. The coefficient of static friction between the box and the surface on which it rests is 0.24 while the coefficient of kinetic friction is 0.12. What maximum distance can the truck travel (starting from rest and moving horizontally with constant acceleration) in 3.0 s without having the box slide?

2007-12-06 16:35:17 · 5 answers · asked by roncho 4 in Physics

This was a bonus question on my test that i know i got wrong. can someone please show me how to do with steps please.

ax^2+bx+c=0

thanks

2007-12-06 16:35:04 · 5 answers · asked by Dude 3 in Mathematics

Behave like a single, moving magnet, as in generating an current in a wire, etc? Assuming they were close enough together, and energized in rapid succession? A series of electromagnets wouldn't experience the 'drag' that a moving magnet would since there's no motion. Would the electrons in the wire be 'fooled'?

2007-12-06 16:33:18 · 1 answers · asked by AmigaJoe 3 in Physics

i am trying to make a 3%
-salt / NaCl
-sugar/ C6H12O6
-asprin/acetylsalicylic acid / C9H8O4
with 500 mL of each water.

How would i make it? would i use 3% of 500 ml (15 grams) of each solute and dissolve it into water?
if not, how much solute would i need and how would i do it?
i'm doing this for a science fair w/ a partner, and the teacher didn't really help us much...so help please!

2007-12-06 16:32:56 · 2 answers · asked by Anonymous in Chemistry

It takes 210 cal to raise the temperature of 340 g of lead from 0 to 10 C. What is the specific heat of lead?

2007-12-06 16:32:44 · 1 answers · asked by jim m 3 in Physics

My brother believes that there are other galaxy's, although I think that the huble telescope just discovered a few nebula's. How can they tell if its a galaxy or just a nebula? And are there even any other galaxies and what are they named?

2007-12-06 16:30:50 · 11 answers · asked by elliot710 1 in Astronomy & Space

in a distant galaxy, they see a sudden, simultaneous rise in visible light and other forms of electromagnetic radiation. Is this evidence to support the idea that the speed of light is independent of frequency?

2007-12-06 16:29:37 · 1 answers · asked by Monkjitsu 1 in Physics

A carnival Ferris wheel has a 15-m radius and completes five turns about its horizontal axis every minute. What is the acceleration of a passenger at his or her lowest point during the ride?

2007-12-06 16:18:38 · 5 answers · asked by roncho 4 in Physics

2007-12-06 16:17:48 · 6 answers · asked by Anonymous in Mathematics

better? lol

2007-12-06 16:17:05 · 8 answers · asked by Anonymous in Mathematics

2007-12-06 16:14:23 · 1 answers · asked by Anonymous in Mathematics

In the 1600's & 1700's none of those people at the time could have ever dreamed of the technologies that we use today so who knows

2007-12-06 16:10:19 · 6 answers · asked by Anonymous in Astronomy & Space

Why couldn't rocket escape black hole? I keep hearing stuff about how the escape velocity is the speed of light and nothing can go the speed of light. So? The Earth's escape velocity is seven miles per second and none of the probes we sent out into the solar system ever went seven miles per second. Instead, they gradually speed up over time to get away from gravity. Likewise, why couldn't a probe with lots of rocket fuel be sent into the event horizon of a black hole and then fire the rockets to escape?

2007-12-06 16:09:05 · 5 answers · asked by Anonymous in Astronomy & Space

Solve the triangle: a = 5, b = 8, c = 12

I found three angles, but their sum come out to 94.11 when it should be 180.

Where am I doing it wrong? I used the law of cosine.

Thanks.

2007-12-06 16:08:49 · 4 answers · asked by labelapark 6 in Mathematics

A plane is headed due east with an airspeed of 340mph. Its true course, however, is at 98degrees from due north. If the wind currents are a constant 55mph what are the possibilities for the ground speed of the plane?

2007-12-06 16:07:11 · 4 answers · asked by Anonymous in Mathematics

1.Five times the sum of twice a number and fiveis twenty-five. Find the number.

2. Sam is 45 years old, which is 20 less then 5 times Minnie's age. Which equation could be used to solve for Minnie's age. How old is Minnie? (Let Minnie's age be x)

2007-12-06 16:05:16 · 6 answers · asked by Anonymous in Mathematics

A liquid ( = 1.65 g/cm3) flows through two horizontal sections of tubing joined end to end. In the first section the cross-sectional area is 10.0 cm2, the flow speed is 265 cm/s, and the pressure is 1.20 105 Pa. In the second section the cross-sectional area is 2.50 cm2. Calculate the smaller section's pressure.

2007-12-06 16:05:13 · 1 answers · asked by shalini p 1 in Physics

Is it possible that the earth has a self-righting mechanism that is creating physical catostrophies like psunamies. earthquakes, hurricanes, tornadoes, etc., in order tweak the north-south axis just a little bit to keep it in the right position?

2007-12-06 16:04:00 · 2 answers · asked by Anonymous in Earth Sciences & Geology

The question is this:

Find the linearization (linear approximation) of f(x) = ln(x) at a =1, then use it to approximate ln (0.98) and ln (1.05). Draw the linearization at a=1, are your approximations over or under approximations? Check on your calculator, how close are you?


I did the first part, I got y=x as the linear approximation. I just don't know how to use this to approximate ln (0.98) and ln (1.05). Would it be 0.98 and 1.05? I'm so confused. Please help! All work should be shown since I need to understand this completely and not just know the answer. Thanks in advance!

Also, I forgot the other question. It is as follows:

2. What function would you use to create a linear approximation for (8.06) ^ (2/3)? Approximate the value using linear approximation or differentials.

Now, I'm thinking that we know the value for 8^ (2/3) and it would just be (8 + x) ^ (2/3) but I'm not sure if this is right and what to do from here

2007-12-06 15:59:41 · 3 answers · asked by Anonymous in Mathematics

2007-12-06 15:51:37 · 6 answers · asked by bozza 1 in Mathematics

1. Let {a_n} from n = 1 to infinity be a bounded sequence. For each n that is an element of the natural number set N, define
y_n = sup{a_k: k>=n}.

(i) Prove that {y_n} from n = 1 to infinity is decreasing and bounded from below, hence convergent.
(ii) Let A be the limit of the sequence {y_n} from n = 1 to infinity. Prove that {a_n} from n = 1 to infinity has a subsequence that converges to A.

2. Use item 1 to prove that every Cauchy sequence is convergent.

2007-12-06 15:49:43 · 1 answers · asked by Gabe 3 in Mathematics

2007-12-06 15:49:22 · 4 answers · asked by Anonymous in Physics

Prove that as k -> 0, the following expression reduces to 1/x:

(1/(k(k-√2))) ( (√2-2k)(√((1/2) + k√2 - k²) x - √(2k√2 - 2k² + x²) )

2007-12-06 15:47:41 · 1 answers · asked by Scythian1950 7 in Mathematics

2007-12-06 15:46:36 · 1 answers · asked by khaj2005 2 in Medicine

a uniform beam weighs 500N and is 2.00m long. it supports a load of 700N. the beam is attached to the vertical wall by a hinge and a cable. the length from the hinge to the cable is 0.4L and from the cable to the load is 0.6L. the angle is 55 degree.
a. find the tension in the cable
b. find the net force exerted by the hinge on the steel bar, and the angle it makes with horizontal axis.

2007-12-06 15:45:08 · 1 answers · asked by Neha G 1 in Physics

I'm sure there are.. Could anyone tell me what kind of African insects swarm? It's for a book. Thanks.

2007-12-06 15:41:56 · 13 answers · asked by Anonymous in Zoology

I read a news story online today about a woman who said she woke up during an operation, she said she couldn't move but could feel the surgeons working. A court awarded the woman 11,000 dollars for her pain and suffering. Now whether or not her story is true, I don’t know. I mean there is really no way to prove either way if she woke up. So, my question is, is this possible? Can you wake up in surgery, be totally aware but paralyzed? I know If this were to happen, it would be very rare, but is it possible?

2007-12-06 15:41:20 · 4 answers · asked by mike h 3 in Medicine

and that passes through the given point?

(-5,5); y = -5x + 9

(-1,-4); y = 1/6x + 1

i think the formula is y - y1 = m (x - x1)
but i'm not sure.


can you please explain to me how you do it?

2007-12-06 15:40:36 · 6 answers · asked by 소미 1 in Mathematics

can someone show me how to do this

2007-12-06 15:37:00 · 1 answers · asked by Anonymous in Mathematics