Science & Mathematics - 16 October 2007

A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 28 m/s, the block hangs vertically down. When the van maintains the same speed around an unbanked curve (r = 150 m), the block swings toward the outside of the curve. Then the string makes an angle with the vertical. Find this angle.

2007-10-16 14:59:07 · 1 answers · asked by Ariel 2 in Physics

Six people are going to sit in a row on a bench. Romeo wants to sit next to juliet. Caesar does not want to sit next to brutus. Homer and pierre can sit anywhere. In how many ways can these six people be seated?

2007-10-16 14:57:03 · 1 answers · asked by luna y 1 in Mathematics

2007-10-16 14:56:53 · 1 answers · asked by john r 1 in Mathematics

How can you determine that 35 and 12 are relatively prime by looking at their prime facorizations? Can you find another pair of relatively prime numbers?

2007-10-16 14:55:54 · 1 answers · asked by nashobamakni 1 in Mathematics

Has anyone heard of the following medicine? Mypepadynazyne? (Ma-pep-aden-a-zine). It is called a musle-relaxing stimulant. Relativity newly approved by the FDA, however I was told that it was recalled by the FDA.
If anyone can give me more info on this drug, It would be really appriciated.

2007-10-16 14:53:02 · 2 answers · asked by Anonymous in Medicine

2007-10-16 14:52:57 · 3 answers · asked by Cami the Awesome 3 in Biology

for x??


3=8x-1

2007-10-16 14:52:48 · 9 answers · asked by Anonymous in Mathematics

A mixture of gases collected over water at 14 celsius has a total pressure of 0.981 atm and occupies 55 mL

how many grams of water escaped into the vapor state?

what volume does the mixture of gases, exclusive of the water vapor, occupy?

what volume does the mixture of gases, exclusive of the water vapor, occupy at STP conditions

2007-10-16 14:52:04 · 1 answers · asked by maybe71400 1 in Chemistry

2007-10-16 14:51:11 · 2 answers · asked by Anonymous in Biology

Acetic acid is the substance responsible for the odor of vinegar. What is the average velocity (in m/s) of acetic acid molecules at 25° C?

2007-10-16 14:48:03 · 1 answers · asked by Anonymous in Chemistry

2007-10-16 14:47:23 · 3 answers · asked by Jenny R 2 in Biology

A block of mass 3.82 kg lies on a frictionless horizontal surface. The block is connected by a cord passing over a pulley to another block of mass 6.4 kg which hands in the air. Assume the cord to be light(massless and weightless) and unstretchable and the pulley to have no friction and no rotational inertia. Acceleration of gravity is 9.8 m/s^2. Calculate the acceleration of the first block? Calculate the tension in the cord answer in Newtons.
my teacher gave me an example with μ but this problem does not give us μ. I think you use this equation
(Mass2)(gravity)-ForceFriction= (masstotal)(acceleration)
Friction Force= μ (mass one)(gravity)
that is the equation i should have used except this problem does not give me μ please help.

2007-10-16 14:46:27 · 2 answers · asked by Anonymous in Physics

A tangent line is drawn to the hyperbola xy=c at a point P.

a) show that the midpoint of the line segment cut from this tangent line by coordinate axes is P.
b) show that the triangle formed by the tangent line and coordinate axes alywas has the same area, no matter where P is located on the hyperbola.

2007-10-16 14:42:25 · 1 answers · asked by jessie.dain 1 in Mathematics

2007-10-16 14:40:49 · 1 answers · asked by masania 1 in Physics

Can you find a smaller common mulitple of 72 and 120 and the greatest?

2007-10-16 14:40:44 · 4 answers · asked by nashobamakni 1 in Mathematics

These are only 5 out of the 30 on my study guide i just need these to check my answers that i have so far please help

Here is an example of one of them and what you have to provide.

problem... 4 x - 9 = 7 x + 12
turns into... - 3 x = 21
answer... x = - 7

*COPY AND PASTE THESE INTO YOUR ANSWER*

1.) 4 . 2 x = - 4 ( 0 . 6 x - 1 . 2 )
turns into...
answer...

2.) - 3 ( x - 8 ) - 5 = 9 ( x + 2 ) + 1
turns into...
answer...

3.) 8 x - 5 ( p + 3 ) = ( 7 p - 1 ) 3
turns into...
answer...

4.) - 4 ( 2 - 3 x ) = 7 - 2 ( x - 3 )
turns into...
answer...

5.) 2 ( x - 8 ) + 7 = 5 ( x + 2 ) - 3 x - 19
turns into...
answer...

2007-10-16 14:38:25 · 4 answers · asked by wes 1 in Mathematics

2007-10-16 14:38:23 · 1 answers · asked by monique b 1 in Biology

A typical hot-air balloon has a volume of 17.9 m cubed when inflated. How much work (in J) must be done to inflate the balloon when atmospheric pressure is 782 torr?

1m cubed = 1000L
782 torr = 1.02 atm

2007-10-16 14:36:44 · 1 answers · asked by Anonymous in Chemistry

Your cousin earns $25.00 per week plus one $5 bonus.
You earn $12 per week babysitting and $15 per week running errands.
After you both work the same number of weeks, you have $11 more than her.

How many weeks did you work?
Write an equation. and solve

2007-10-16 14:36:15 · 4 answers · asked by Live To Rock♪♫ 4 in Mathematics

My friend is afraid of spiders and I want her to overcome her fears please I need help!!!!!!!

2007-10-16 14:34:49 · 4 answers · asked by Anonymous in Zoology

N=2

how do i get this?

2007-10-16 14:31:42 · 9 answers · asked by Anonymous in Mathematics

2007-10-16 14:30:57 · 5 answers · asked by Anonymous in Mathematics

I have approached a GM rep earlier this year at the GM building in detroit during a audition for a tv show about people who is asking for money for any reason. Any way I had talk to this person and he said to contact the engineer department. There is a trust factor, auto companies they like to rip off new tech from individuals and shaft them and call it there own. The military is just as slick. Remember the guy who made things levitate in his apartment with old surplus electronics. The military came saw and rapped his apartment of everything eventually. The guy didn't even get paid. What shall I do?
This new energy source is for real. Imagine riding in your vehicle across country from Detroit to Califronia. Need gas? never. Need to recharge at a stationary recharging port ? never. Need snacks, drinks? Yes. This is what can be in the near future with my system called the Sress. It's a real working small scale prototype. It works like it was projected to work.11 years in the making.

2007-10-16 14:30:18 · 7 answers · asked by redundent 1 in Other - Alternative

The question is that a mass is shot from a cannon and the end of the cannon's barrel is at a height of 6.9m. The initial velocity vi of the projectile has a horizontal component of 4.6m/s. The projectile rises to a maximum height of delta y above the end of the cannon's barrel and strikes the ground a horizontal distance delta x past the end of the cannon's barrel and the acceleration of gravity is 9.8m/s^2. I have to find the time it takes for the projectile to reach its maximum height in seconds. I used vy^2=voy^2-2g(y-yo) and I get 7.6 but it's not the right answer if someone knows what I did wrong that would be so helpful.

2007-10-16 14:27:17 · 1 answers · asked by glance 3 in Physics

A=2a[squred] + 4ah solve for h


S= vt=16 t[squared] solve for v


A=1/2h (a+b) solve for h


S= n/2 (a+l) solve for n



P=2(l+w) solve for w


A=v-u/t solve for t



C=5/9 (F-32) solve for F



thanks!!!!

2007-10-16 14:27:14 · 2 answers · asked by Megan 2 in Mathematics

For what values of a and b is (a × b) < 0?

(A) a = 3, b = .0001
(B) a = –2, b = –.0001
(C) a = 7, b = 0
(D) a = –1, b = –19
(E) a = –2, b = 3

The answer is E...
But isn't A and B also right?
Because
(A) .0003 is less than 0
(B).0002 is also less than 0
?
i am confused

2007-10-16 14:26:15 · 3 answers · asked by Anonymous in Mathematics

A 0.8 kg tennis ball is dropped from rest at a height of 5.6 m onto a hard floor.

a) What is the speed of the ball at the instant of contact with the floor?

|v| = m/s
A flash photograph shows that the ball is compressed a maximum of 0.6 cm when it strikes the floor. b) Assuming that the acceleration of the ball is constant during its contact with the floor, what force does the floor exert on the ball?

|f| = N
c) Over what time does the force act in bringing the ball to rest?

D t = s

2007-10-16 14:25:27 · 1 answers · asked by cuteeebabygirl 1 in Physics

Um, there's this thing about how if you go back in time and change the past, the event that made you go back in time to change it in the first place never happens, so you never go back in time, so it does happen. What's that called?

2007-10-16 14:25:08 · 19 answers · asked by princesspower100 2 in Astronomy & Space

Can anyone give me reasons to why the landing/walking on the moon by Neil Armstrong was faked?

2007-10-16 14:25:06 · 9 answers · asked by bludevil260_ya 3 in Astronomy & Space

2007-10-16 14:22:51 · 4 answers · asked by uclabruinsla 1 in Earth Sciences & Geology