Science & Mathematics - 22 October 2007

Given that the mass of block A is 8.30 kg and the coefficient of static friction between block A and the surface on which it rests is 0.340, what is the maximum mass block B can have and the system still remain in equilibrium? (Both blocks are at rest).

http://i214.photobucket.com/albums/cc30/bkoz319/06-33.gif





Thanks sooo much for your help!! God Bless!

2007-10-22 06:27:34 · 1 answers · asked by CrimsonRider 1 in Mathematics

I have one tree and 2 bushes (the bushes are Montgomery Blue spruces and the tree is a Fat Albert). On the two bushes there are full branches that have lost all of their needes (~2-3 branches per bush). The needles on the tree (Fat Albert) are turning yellow at the tips, and some are falling off. These are all new plants from this spring. I live in Chicago, and the climate has been a bit unseasonably dry and warm. I am looking for input as to whether or not this is normal, what are some thoughts as to what can be going on, nd if there are any remedies that can be applied. I appreciate your thoughts in advance.

2007-10-22 06:26:33 · 1 answers · asked by niupt2k 1 in Botany

This is a typed out pic, http://smg.photobucket.com/albums/v180/Wazuka/?action=view¤t=mathprob.jpg
if it is confusing....

Thanks for the help...

2007-10-22 06:26:06 · 6 answers · asked by Molly❀ 3 in Mathematics

Showing all your working, solve this simultaneous equation:
3x -4y = 23
5x +2y = 21

2007-10-22 06:26:00 · 7 answers · asked by 29chris29 1 in Mathematics

Could you tell the time by using his nose as a sun-dial?

2007-10-22 06:24:30 · 8 answers · asked by Anonymous in Astronomy & Space

The radius of a sphere is increasing at a rate of 4 mm/s. How fast is the volume increasing when the diameter is 100 mm? Evaluate your answer numerically.
mm^3/s

A street light is mounted at the top of a 15 foot tall pole. A man 6 ft tall walks away from the pole with a speed of 4 ft/s along a straight path. How fast is the tip of his shadow moving when he is 40 ft from the pole?
ft/s

2007-10-22 06:22:16 · 3 answers · asked by Anonymous in Mathematics

radicands represent positive real numbers.


cube root(27) - 5*cube root(8)

2007-10-22 06:20:10 · 2 answers · asked by Anonymous in Mathematics

The magnitude of the net force exerted in the x direction on a 3.15 kg particle varies in time as shown in the figure below.

There is a graph that is supposed to be here. The y-axis is F(N) and the x-axis is t(s)
It starts from the orgin then goes to point (2,4), then to (3,4), then ends at (0,5). Im sorry if this looks confusing, but it wouldnt let me post the graph.

(a) Find the impulse of the force. The answer to this one is 12.0 N-s

(b) Find the final velocity the particle attains if it is originally at rest.
i m/s

(c) Find its final velocity if its original velocity is -3.4 m/s .
i m/s

(d) Find the average force exerted on the particle for the time interval between 0 and 5.00 s.
N

2007-10-22 06:19:35 · 1 answers · asked by surfing86 2 in Physics

2007-10-22 06:19:22 · 6 answers · asked by goku 1 in Engineering

A m1 = 0.550 kg block is released from rest at the top of a frictionless track h1 = 2.65 m above the top of a table. It then collides elastically with a 1.00 kg block that is initially at rest on the table, as shown in Figure P6.57.

http://www.webassign.net/sf/p6_57alt.gif

(a) Determine the velocities of the two objects just after the collision.
velocity of m1:
velocity of m2:

(b) How high up the track does the 0.550 kg object travel back after the collision?

(c) How far away from the bottom of the table does the 1.00 kg object land, given that the table is 2.20 m high?

(d) How far away from the bottom of the table does the 0.550 kg object eventually land?

2007-10-22 06:17:56 · 2 answers · asked by Anonymous in Physics

0.052 nm (a wavelength contained in medical X-rays)

2007-10-22 06:14:48 · 1 answers · asked by Anonymous in Physics

2007-10-22 06:12:32 · 7 answers · asked by Al 2 in Astronomy & Space

2007-10-22 06:12:21 · 4 answers · asked by Flamezz 5 in Mathematics

If p and q are distinct primes and gcd(a,p*q)=1 and
n=lcm(p-1,q-1), then show that a^n = 1(modulo p*q).

Okay, we have gcd(a,p)=gcd(a,q)=1 since p and q are distinct. Then by Fermat's Theorem,

a^(p-1)=1 (modulo p) and a^(q-1)=1 (modulo q). Then how can we proceed?

2007-10-22 06:10:35 · 1 answers · asked by Anonymous in Mathematics

Let cos alpha - (sqroot 5) / 5: 0 < alpha < pi/2; sin beta = -4/5: -pi/2 < beta < 0. Find the exact value of the following:


c) sin (alpha / 2)

d) cos(2 beta)

please help and explain, keep getting different answers, thanks

2007-10-22 06:07:39 · 1 answers · asked by mathhelpmee 1 in Mathematics

2007-10-22 06:06:11 · 9 answers · asked by Franco 1 in Earth Sciences & Geology

A wooden block of mass m = 9 kg starts from rest on an inclined plane sloped at an angle q from the horizontal. The block is originally located 5m from the bottom of the plane.

If the block, undergoing constant acceleration down the ramp, slides to the bottom in t = 2 s, and q = 30°, what is the magnitude of the kinetic frictional force on the block?

2007-10-22 06:04:45 · 2 answers · asked by GirlYgIRL 1 in Physics

given:

gamma=40
a=3
b=4

Have to find:

Beta , alpha, c

please help me and explain this to me step by step, thanks my book sucks!!

2007-10-22 06:00:42 · 4 answers · asked by Anonymous in Mathematics

2007-10-22 05:56:49 · 3 answers · asked by Anonymous in Mathematics

it's really simple but i just need to know what it is, helpppp a;lskjdfl;kjad

2007-10-22 05:56:17 · 7 answers · asked by Katie 4 in Mathematics

2007-10-22 05:51:00 · 6 answers · asked by jimmy n 1 in Mathematics

I have seen people answering using square root symbols, integral symbols etc. Do you need a special key board? Do you have to use control keys or do you have to download fonts? How is it done?

2007-10-22 05:50:02 · 2 answers · asked by cidyah 7 in Mathematics

2007-10-22 05:49:10 · 8 answers · asked by Anonymous in Mathematics

When you see a picture of the planet Jupiter, you see bands of colour, the red spot etc. But if the planet outter is mainly gas, why hasn't the gas mixed completely and left the planet appearing as a single colour?

If I took several colours of paint and mixed them, you'll see colour swirles, but eventually I'll be left with one colour. Ok, Jupiter is a very large planet, but surely over millions of years the colours should have murged?

2007-10-22 05:43:03 · 5 answers · asked by IanQuigley 1 in Astronomy & Space

2007-10-22 05:41:43 · 1 answers · asked by Tearra W 1 in Astronomy & Space

makes me wonder what kind of a winter we will endure,will we have above average snowfall and freezing temperatures, or will it be mild,with very little snow. i think the northeast will have wicked weather as this usually happens when we get summer weather this late in the fall.what do you think?

2007-10-22 05:41:22 · 4 answers · asked by Anonymous in Weather

the top growth which is tender is eaten away by these insects.growth of the plants are stunted.can i use some fertilizers for the same?please reply asap...

2007-10-22 05:38:09 · 10 answers · asked by howzaat 1 in Botany

2007-10-22 05:38:07 · 29 answers · asked by Anonymous in Biology

If you have a typical lock that takes 3 numbers to open it. 1 to the left, 1 to the right, 1 to the left (you guys know what i'm talking about) - and there are 36 numbers to choose from (0-35) What is the FORMULA to find out how many possible combinations there are? I know there has got to be a standard formula for this - isn't there? PLEASE Help! Your time & response is greatly appreciated!!

2007-10-22 05:34:48 · 5 answers · asked by Cassie K 2 in Mathematics

There could be some interesting paranormal twists to the challenges. Got any ideas?

2007-10-22 05:27:47 · 10 answers · asked by Father Ted 5 in Other - Alternative