Physics - October 2007

wat contributes to the fall of water level. cos.. usually if something falls the water level will rise... right?

2007-10-11 19:19:15 · 7 answers · asked by Anonymous

There's apparently this book called the Urantia Book. A lot of people claim it's revelatory and has proven many scientific things before they came to pass...One thing has me skeptical though:

Please read the following statement (by the way Ovronton is supposedly the name of our universe as the book describes it):

"In Orvonton it has never been possible naturally to assemble over one hundred orbital electrons in one atomic system. When one hundred and one have been artificially introduced into the orbital field, the result has always been the instantaneous disruption of the central proton with the wild dispersion of the electrons and other liberated energies."

Now I know that some "elements" above 100 are more stable than some of the elements below 100 (ex: radioactive elements below 100). But, I am wondering if perhaps I am misreading this? The book had this information composed in 1934...so I am not sure what the definition of an atomic system is/was in 1934...can someone help me?

2007-10-11 18:56:04 · 3 answers · asked by Joe F 2

a)and the number of particles are increased.
b)is increased, but the number of particles is constant.
c)and the number of particles are constant.
d)is constant, but the number of particles is increased.

2007-10-11 18:45:51 · 3 answers · asked by Anonymous

10 pts to best answer

2007-10-11 18:11:23 · 5 answers · asked by Hj D 1

2007-10-11 18:05:35 · 9 answers · asked by Alyssa T 1

i need to do this for my study guide and i can't recall what the answer is!! help..please!

2007-10-11 17:44:11 · 12 answers · asked by Celiy 1

constant acceleration of of 0.6m/s^2. Just as it does,a Hummer pases it,going at a steady velocity of 65km/hr.

A) How LONG does it take the Mini Cooper to be going as fast as Hummer?
B) How LONG does it take the Mini Cooper to catch the Hummer?
C) How FAR from the traffic lights are the cars when the Mini Cooper catches the Hummer?

2007-10-11 17:38:23 · 1 answers · asked by Luv Dual-Core 2

A woman at an airport is towing her 20.0 kg suitcase along a horizontal surface for 10 m from rest, she is pulling a constant 40 N force along the strap which is at an angle 30 degrees with respect to the horizontal. The coefficient of kinetic friction between the suitcase and the floor is .150.

a.) what normal force does the ground exert on the suitcase?
b) how much work is done by the pulling force?
c) How much work is done by the friction force?:
d) what is the speed of the suitcase after 10 m? You can use kinematics or work KE theorem.

I tried working out the problem but need to know if I doing it right.

For a, I used the formula Fy + n - w = 0 to find normal force.
40sin(30) + n - (9.8 x 20) = 0
20 + n - 196 = 0
n = 176 N

For b, I used the formula w = F sin (theta) (delta x) and got
w = (35) sin (30) (10) = 175 J

For c, I used friction = n (uk) where n = mg - F(app)sin(theta)
(9.8)(20) - 40 sin (30)
196 -20 = 176 (.150) = 26.4 J

I need help with starting d, also. Thnks

2007-10-11 17:11:48 · 4 answers · asked by redblitz528 1

a temperture controled case? This is for my homework and so far I had no chance of finding the answer...

2007-10-11 17:09:47 · 2 answers · asked by Remmy T. 2

This optical illusion was on Ebaumsworld.com It states that if the figure is spinning clockwise, then you use your right brain more. But if it's counter-clockwise, then you're left brain dominant.

I see it spinning clockwise...

I guess my question is...is it real? And does anyone see it counter-clockwise?

Here's the link.

http://www.ebaumsworld.com/pictures/view/41127/

2007-10-11 16:56:50 · 10 answers · asked by Anonymous

or one when the numbers are rounded?

X Y

1 10.25n
2 6.25n
3 4.00n
4 3.75n
5 3.50 n
6 1.80n

n=newtons

2007-10-11 16:52:37 · 3 answers · asked by jessi 2

its not the 1st time this has happen to me it all started when i was about 13 i was on the phone talking to a friend about someone who had died in our school and all of the sudden i heard his voice didnt think much of it then when i was a senior i moved in with my grandfather i was laying down in the cough and i felt some1 touching my face but no1 was their i tried to get up but it was like some1 was holding me down so that freaked me out didnt think much of it now years went by nothing till a month or so when i found out 1 of my aunts daughter was sick and this time i was walking down the hall going to sleep when i saw a little girl and i thought it was my little girl that she got out of bed so when i went down to pick her up it was air i couldnt pick her up and next thing i knew it was gone and then i get a call from my mom that my aunts daughter passed away now my aunt daughter isnt little she was about 35 or so now i see her in my dreams and shes sending me messages for her family

2007-10-11 16:37:34 · 8 answers · asked by ERICA M 1

After playing a multi-player fps game and getting sniped by an enemy sniper several times I got really pissed of....,

Could there be a device which detects the sniper position before he gets his first shot? I believe the radar doesn't work on a sniper, cause they track only moving targets

This might be stupid, but this is the only place to ask anything, so just read it..

could there be a device which spits out charged particles( robots) in all directions like a radar. When the particles hits and accumulate on a human(lens of eye) it lights up and sends some kind of a signal back to our device and notify about the presence of the sniper???

I know its logical, but is it practical?

2007-10-11 16:28:47 · 2 answers · asked by mohan k 1

yeah i'm supposed to get current (i)2 = [R3/(R2+R3)] * (i)1

2007-10-11 16:22:44 · 1 answers · asked by rick m 1

When vector A is added to vector B, which has a magnitude of 5.0, the vector representing their sum is perpendicular to A and has a magnitude that is twice that of A. What is the magnitude of A.

Im pretty much stumped, though I know the answer is 2.2. Could anyone explain? Thanks.

2007-10-11 15:57:31 · 2 answers · asked by Anonymous

2007-10-11 15:44:14 · 2 answers · asked by sojo3 1

2007-10-11 15:43:09 · 2 answers · asked by sojo3 1

The mass of a box is 50kg sliding down a bank angled 30 degrees to the horizontal. The coefficient of friction is 0.20.(a)
What is the acceleration of the box? (b) What is the frictional force on the box?

2007-10-11 15:38:05 · 4 answers · asked by mike h 1

2007-10-11 15:24:10 · 2 answers · asked by Anonymous

2007-10-11 14:56:52 · 1 answers · asked by GC8 1

The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers. In the women's competition, the end of a typical launch ramp is directed 61° above the horizontal. With this launch angle, a skier attains a height of 15 m above the end of the ramp. What is the skier's launch speed?

2007-10-11 14:31:02 · 1 answers · asked by Anonymous

Part 1)
The initial speed of a body is 8:08 m/s.
What is its speed after 1.54 s if it accelerates
uniformly at 3:03 m/s2? Answer in units of
m=s.

Part 2)
What is its speed after 1.54 s if it accelerates
uniformly at -3.03 m/s2? Answer in units of
m=s.

2007-10-11 14:24:20 · 2 answers · asked by Jarod S 2

Not H20, an EQUATION

2007-10-11 14:09:14 · 2 answers · asked by Anonymous

I weigh about 165lbs and had say 20lbs of climbing gear on. Falling at 33ft/sec/sec I was in the air for just under one second. Could anyone tell me the force of impact? I landed somewhat flat on my back so the majour impact was spread over about say 4.5 to 5 sq ft.
(I was able to walk out of the hospital that night but spent the next 6 weeks onthe couch)

2007-10-11 13:45:55 · 5 answers · asked by Anonymous

A motorcycle daredevil is attempting to jump across as many buses as possible (see the drawing). The takeoff ramp makes an angle = 18.0° above the horizontal, and the landing ramp is identical to the takeoff ramp. The buses are parked side by side, and each bus is 2.74 m wide. The cyclist leaves the ramp with a speed of v = 31.0 m/s. What is the maximum number of buses over which the cyclist can jump?

2007-10-11 13:40:45 · 12 answers · asked by Anonymous

Each having a spring constant of 5000 N/m
A 41kg person jumps from a 1.9m platform onto the innersprings.
the accel of gravity is 9.8m/s^2
assume the springs were initially unstretched and that they stretch equally .

Determine the stretch of each of the springs.

2007-10-11 13:21:48 · 1 answers · asked by michael 1

1.An object that weighs 50-N is in free fall.

a. What is the net force on this freely falling object?

b. What is the net force when the object encounters 15 N of air resistance?

c. What is the net force when it falls fast enough to encounter 50 N of air resistance?

2.The force of friction acting on a sliding crate is 120 N.

a. How much force must be applied to maintain a constant velocity?

b. What will be the net force acting on the crate?

c. What will be the acceleration?

3.A 15.9-kg mass on a horizontal friction-free air track is accelerated by a string attached to another 15.9-kg mass hanging vertically from a pulley as shown above. The masses are connected by a string, and move together as one unit.
(a)Since the track is frictionless, the weight of the hanging mass is the only force acting to accelerate the masses. What is their acceleration?
(b)Suppose the mass on the table is 7.95 kg, and the hanging mass is 31.8 kg. What is their acceleration? thx :]

2007-10-11 13:19:21 · 1 answers · asked by thinktank 2

A 115 x 10-6 F capacitor is connected to an ac generator with an rms voltage of 15.9 V and a frequency of 154 Hz. What is the rms current in this circuit?

The rms current is A.


Please explain, thanks!

2007-10-11 12:36:17 · 1 answers · asked by Anonymous

Consider a force of 62.4N pulling 3 blocks of identical masses, where each mass is 1kg, along a rough horizontal surface. The coefficient of kinetic friction is 0.8. The accel of gravity is 9.81m/s^2.
- What is the acceleration?


-The tension of the strings are T1 and T2. The equation of motion m2 is given by what ?
a) T1-μ m2g = m2a
b) T1-T2 + μ m2g - μ m1g = m2a
c) T1 + μ m2g = m2a
d) T1- T2 - μ m2g = m2a
e) T1 - T2 + μ m2g = m2a
f) T1 + T2 - μ m2g = m2a
g) T1 + T2 - μ m2g - μ m1g = m2a.

Please Help, I thought I figured it out - but was wrong..thanks

2007-10-11 12:35:12 · 1 answers · asked by Anonymous

Box 1 of mass m1=5.0kg starts from rest in point A and slides down a frictionless ramp of height h=0.50m. In point B, the surface becomes horizontal and rough, with a coefficient of kinetic friction u=0.1. In point B, Box 1 collides head-on elastically with the stationary Box 2 of mass m2=7.0kg. After collision, the Box 1 slides back up on the ramp, and Box 2 travels a horizontal distance d=0.50m. In point C, Box 2 hits a long spring with elastic constant k=350 N/m. The spring is compressed by the incoming box (the surface under the spring is frictionless).

a) Calculate the speed, VB, of Box 1 at the base of the ramp, just before the collision.
b) Calculate the velocities of the two boxes immediately after the head-on elastic collision.
c) How high up the incline does Box 1 climb after the collision?
d) What is the kinetic energy of Box 2 immediately before striking the spring?
e) Calculate the maximum compression of the spring.

2007-10-11 12:23:36 · 2 answers · asked by snow200098 2