Science & Mathematics - 23 October 2007

2007-10-23 20:58:34 · 10 answers · asked by JENNIFER P 1 in Mathematics

2007-10-23 20:56:38 · 2 answers · asked by alisha 2 in Botany

A magnetic field has a magnitude of 1.20E-3 T, and an electric field has a magnitude of 4.70E3 N/C. Both fields point in the same direction. A positive 1.8 µC charge moves at a speed of 3.40E6 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge.

2007-10-23 20:48:38 · 1 answers · asked by Josh M 1 in Physics

In a television set, electrons are accelerated from rest through a potential difference of 25 kV. The electrons then pass through a 0.30 T magnetic field that deflects them to the appropriate spot on the screen. Find the magnitude of the maximum magnetic force that an electron can experience.

2007-10-23 20:42:09 · 1 answers · asked by Josh M 1 in Physics

2007-10-23 20:39:09 · 9 answers · asked by JENNIFER P 1 in Mathematics

When the 2 life preservers are fully submerged, the one filled with lead sinks & the styrofoam one rises to the top because:
a)the buoyant force is greater on the styrofoam
b)the weight of the lead is greater than the buoyant force
c)the weight of the styrofoam is less than the buoyant force
d)the density of the lead is less than that of water
e)2 of the above

Wouldn't the answer to this be b & c or e)2 of the above?

2007-10-23 20:35:29 · 1 answers · asked by AnonymousOne 2 in Physics

2007-10-23 20:32:57 · 7 answers · asked by Devils advocate 1 in Mathematics

2007-10-23 20:32:08 · 2 answers · asked by triplel R 1 in Physics

2007-10-23 20:28:09 · 5 answers · asked by Anonymous in Chemistry

1) CCl4
2) HCl
3) H2CO
4) BF4 -
5) NH3

2007-10-23 20:20:18 · 7 answers · asked by Anonymous in Chemistry

How is this possible scientifically speaking?

2007-10-23 20:19:11 · 5 answers · asked by Puppy Zwolle 7 in Physics

A sledge loaded with bricks has a total mass of 17.6 kg and is pulled at constant speed by a rope. The rope is inclined at 19.9° above the horizontal, and the sledge moves a distance of 19.5 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.
(a) What is the tension of the rope?
N
(b) How much work is done on the sledge by the rope?
kJ
(c) What is the energy lost due to friction?
kJ

2007-10-23 20:17:59 · 2 answers · asked by inpsite 1919 3 in Mathematics

What does the word slice mean in the context of Compute tomography? The more detail the better.

2007-10-23 20:14:27 · 3 answers · asked by dudey0man 1 in Medicine

Derivatives are Very Confusing.

2007-10-23 20:13:56 · 3 answers · asked by Conservative Jesus 1 in Mathematics

Equal masses of oxygen (O2) and fluorine (F2) are placed in separate flasks at the same volume and temperature. Which of the following statements is true? Circle the correct answer.

a) Do both flasks contain same number of molecules?

b) Are the molecules of oxygen moving faster than fluorine?

c) Is the pressure in the oxygen flask is higher than the pressure in the fluorine flask?

d) Are more molecules are present in the fluorine flask?

2007-10-23 20:03:38 · 3 answers · asked by Hellos 1 in Chemistry

A mass, which is connected to a string, is placed on a frictionless surface. At the end of the string there is a 1N weight. The string is guided by a frictionless pulley, so that the 1N weight is suspended on air and it is not in contact with any surface.

a) What must be the tension on the string so that the mass slides on the frictionless surface at a rate of 1.45m/s^2?

b) What is the value of the mass if the tension of the string is found to be 1.5N and the mass is now at rest?

2007-10-23 19:54:00 · 2 answers · asked by Anonymous in Engineering

okay, i've been working in circles on this for a while.

considering Euler's formula where V - E + F =2

A polyhedron has 20 faces that are hexagons and p faces that are pentagons with no additional faces. Three faces/edges meet at each vertex.

a) in terms of p, determine the number of edges
b) in terms of p, determine the number of vertices
c) determine the value of p

2007-10-23 19:49:27 · 1 answers · asked by wiczyman 5 in Mathematics

Calculate each of the following quantities.
(a) volume of 14.7 M sulfuric acid that must be added to water to prepare 2.00 L of a 0.271 M solution

(b) molarity of the solution obtained by diluting 75.7 mL of 0.231 M ammonium chloride to 0.250 L

(c) volume of water added to 0.150 L of 0.0252 M sodium hydroxide to obtain a 0.0100 M solution (assume the volumes are additive at these low concentrations)

(d) mass of calcium nitrate in each milliliter of a solution prepared by diluting 56.5 mL of 0.726 M calcium nitrate to a final volume of 0.100 L

2007-10-23 19:48:14 · 3 answers · asked by Ruby Winter 2 in Chemistry

list some of them

we have to spray it to repel public away when they disturb whilst arranging a concert...

2007-10-23 19:43:29 · 12 answers · asked by Shehzad Roy 1 in Chemistry

2007-10-23 19:33:56 · 6 answers · asked by puneet v 1 in Biology

Einstein says that accelerating an object will increase it mass expotentially.What happens if you accelerate a singularity?

2007-10-23 19:32:13 · 4 answers · asked by Anonymous in Physics

Calculate the force of a 10 kg object that is pushed 44 m by 3 people for 17 minutes, when the object finally touches you its is traveling 3 m/s2. ( Note: it is pushed by 3 people )

2007-10-23 19:28:55 · 3 answers · asked by rockerkid100 2 in Physics

which has the higher frequency--

dim purple light [wavelength=400 nm]
OR
bright red light [wavelength=700 nm]

&
can you tell me how you know?

2007-10-23 19:22:48 · 1 answers · asked by Anonymous in Physics

2007-10-23 19:12:28 · 5 answers · asked by joe 2 in Earth Sciences & Geology

diff:

f(x)= cos (ln x)


A step by step brake down would be appreciated. Trig in anything always messes me up.

2007-10-23 19:07:58 · 5 answers · asked by Anonymous in Mathematics

??

2007-10-23 19:06:53 · 14 answers · asked by cucumis_sativus 5 in Zoology

3.4 < k*z < 10.5

and

0.8 < (k+1)^2 / (k*z) < 0.844

I know these are nonlinear, but I also know they are solvable.
Thanks!

2007-10-23 19:04:24 · 2 answers · asked by R D 2 in Mathematics

What is the first animal that comes to mind when you think of one that is unintelligent?

2007-10-23 18:56:39 · 10 answers · asked by vwmanxter 2 in Zoology

http://docs.google.com/Doc?id=dgmbvt73_3cxtc95

the problem is at the link above. i though i was just supposed to take the integral from 0 to 1 of each parametric equation but my answers are not coming out like any of the answers given. Not sure what i'm doing wrong. thanks for any help

2007-10-23 18:55:59 · 2 answers · asked by bob oso 2 in Mathematics

I'm not sure if this counts but sometimes my cd player starts playing on its own right when I wake up. I've had other weird stuff happen too.

2007-10-23 18:55:55 · 20 answers · asked by Arctic Wolf 3 in Paranormal Phenomena