Physics - November 2007

When observing any object/thing within the Universe one can conclude certain facts. Irregardless of whether the object/thing is familiar to the observer or not, these certain facts are still conclusive by the direct sensation and rational thought. These conclusive facts are that the object/thing occupies a certain amount of space/volume/dimension and a certain amount of mass. This is evidently observed in every object/thing within the Universe, even if it is a newly discovered substance or element.
By using the rational thought process one is able to sense that the certain amount of mass and space occupied by an object/thing deems it to be limited. Due to the mass and space being only a certain amount, it is also therefore limited to that amount. For example if we were to observe a rock occupying 5cm3 and weighing 5g, this rock would be occupying a certain amount of mass and space i.e. 5 cm3 and 5g. It is thus conclusive that the rock is limited because it is only 5 cm3 and 5g.

2007-11-21 21:57:51 · 17 answers · asked by rockstar 1

What can you say about the motion of this system of pieces?

PHYSICS conceptual question, please help, thank you!

2007-11-21 17:34:01 · 2 answers · asked by Callie 1

a uniform rod of weight 80 Newtons is suspended from the ceiling by string attached to its ends. The rod is in equilibrium at an angle 10 degrees to the horizontal and the string attached to the higher end is at an angle 40 degrees to the vertical. Find the angle which the other string makes with the vertical. Find also the tension in the two strings.

2007-11-21 17:24:10 · 1 answers · asked by Anonymous

Physics textbook conceptual question, please help! Thank you!!

2007-11-21 17:02:53 · 11 answers · asked by Kiwikahuna 2

2007-11-21 16:24:49 · 5 answers · asked by ricnoodle 4

I have this question and:

Name two modifications that had to be made to the original Dalton's Atomic Theory to incorporate new experimental evidence and briefly discuss this evidence.

I know I learned it and wrote it down somewhere and I cannot for the life of me find it anywhere. These two questions are really starting to stress me out. Please HELP!!!

2007-11-21 15:14:56 · 2 answers · asked by TeddyGram 2

An 83-kg baseball player slides into second base. The coefficient of friction between the player and the ground is 0.54. If the player comes to rest after 1.7 s, what was his initial velocity?

2007-11-21 15:11:10 · 3 answers · asked by Mr. Tambourine Man 3

2007-11-21 14:54:33 · 5 answers · asked by Osvaldo S 1

A 40.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 21.0 m.

1. What force does the seat exert on the child at the lowest point of the ride?... magnitude and direction

2. What force does the seat exert on the child at the highest point of the ride?... magnitude and direction

3. What force does the seat exert on the child when the child is halfway between the top and bottom?... magnitude and direction

i found the centripel acceleration to be 1.84 m/s2 and the angular velocity to be 0.418879 rad/s. i have no idea what to do next :( please help. thanks

2007-11-21 14:41:40 · 1 answers · asked by Anonymous

is science a proven fact?
if it is not proven then it has to be an art.

2007-11-21 14:11:32 · 3 answers · asked by Alan G 2

1) a 615 kg racing car completes one lap in 14.3 s around a circular track with a radius of 50.0m. the car moves at constant speed.
a) what is the acceleration of the car?



2)an athlete whirls in a 7.00 kg hammer tied to the end of 1.3m chain in a horizontal circle. the hammer makes one revolution in 1.0s.
1))what is the centripetal acceleration of the hammer?




3)the carnival ride has a 2.0m radius and rotates once of a rider.
a)find the speed of a rider.
b)find the centripetal accleration of a rider
c)what produces this accleration?
d)when the floor drops down, riders are held up by friction. draw motion and free body up by friction. draw motion and free body diagrams of the situation
e)what coefficient of static friction is needed to keep the riders from slipping?

i need help with these question.....please.........

2007-11-21 14:09:29 · 2 answers · asked by peipei91189 1

Provided that you have an airplane large enough for this capacity, suppose that you have a 1000 lb load of canaries. You take off and all of a sudden all the canaries start flying within their cages. Supposing that the cabin is pressurized, does the airplane now weigh less because the canaries are no longer on their perch? Or does the airplane weigh the same?

After being asked this question, I thought it through with the knowledge that I possess of physics and this is what I came up with.

I took Newton's third law to base my conclusion. Therefore the air that is giving them lift is compressed in small waves and then dissipates over distance. In relation to the surfaces within the aircraft, the pressures are distributed when compressed. Since it is a closed system no mass or energy is lost. It is a bastardized explanation to something that can be taken to many levels of calculation, but is my assumption correct? Or would it be more eluding?

2007-11-21 13:50:59 · 3 answers · asked by Damian 2

a proton moves with a speed of 0.900c . calculate its rest energy.

calculate its total energy.

calculate its kinetic energy.

please show work...thanks...

2007-11-21 13:07:45 · 5 answers · asked by meeh 1

2007-11-21 12:47:28 · 1 answers · asked by Nathan B 1

A Carnot heat engine operates between reservoirs at Th= 1545 K and Tc= 150 K. in each cycle, 250 joules of heat energy is rejected to the low temperature reservoir. in each cycle, how much mechanical work W is performed by the engine?

2007-11-21 11:28:26 · 1 answers · asked by ecast4uhm246 1

A playground merry go round of radisu 2.15 m has a moment of inertia 245 kg. m^2 and is rotatings at 5.6 rev/min about a friction-less vertical axle. Facing the axle, a 21.3 kg child hops onto the merry go round, and sits down on the edge.
What is the new angular speed of the merry go round? Answer in units of rev/min
if anybody do that please reply at manon457@yahoo.com

2007-11-21 10:44:34 · 1 answers · asked by manon 1

How much energy is required to change a 42g ice cube from at -11C to steam at 111C?

2007-11-21 10:23:16 · 2 answers · asked by summersun 1

If water in a sealed, insulated container is stirred, is its temperature likely to increase slightly, or decrease slightly, or stay the same? Explain your answer.

Given your answer to the above statement, why does stirring a hot coffee cool it down?

2007-11-21 10:21:56 · 3 answers · asked by summersun 1

when I make instant coffee (or hot chocolate), stir the milk and sugar in and tap the spoon on the rim of the mug, for about 10-20 seconds, the note that the tapping makes rises in pitch.

If I then restir the it, the resonant note deepens, and again rises when I tap on the rim.

this behaviour does not happen with:
(a) a cup of plain cold water,
(b) a cup of plain hot water,
(c) nor even a mug of cold water containing instant-coffee solids
(d) nor a mug of hot tea.

it happens only when it is both hot and contains instant-coffee or cocoa (hot chocolate) solids.

can anyone explain this phenomenon?

2007-11-21 09:51:50 · 1 answers · asked by Anonymous

A hole is drilled through uniformely dense Earth, from North to South pole.
Four clocks were syncronized at North pole.

One clock A was dropped into the hole and reappeared 84 minutes later.
Clock B was launched into low polar orbit, and landed at North pole 84 minutes later.
Clock C was fired upward with carefully chosen inital velocity, and landed simultaneously with A and B 84 minutes later.
Clock D remained at rest at North pole.

Which clocks are ahead and which are behind?
(Note that A,B and C remained in free fall and followed geodesic lines)

2007-11-21 09:23:37 · 3 answers · asked by Alexander 6

which of the following is a TRUE statement? (A) it is possible to transfer heat from a cooler to a hotter body. (B) it is possible for heat to flow spontaneously from a hot body to a cold one or from a cold one to a hot one, depending on whether or not the process is reversible or irreversible. (C) the second law of thermodynamics is a consequence of the first law of thermodynamics. (D) it is not possible to convert work entirely into heat. (E) all of these statements are false.

2007-11-21 09:23:24 · 3 answers · asked by Anonymous

please explain how it's done

2007-11-21 09:21:49 · 3 answers · asked by Anonymous

2007-11-21 09:07:37 · 37 answers · asked by . 1

What is your reaction to this recent finding ?

http://www.telegraph.co.uk/earth/main.jhtml?xml=/earth/2007/11/14/scisurf114.xml&CMP=ILC-mostviewedbox

2007-11-21 08:59:16 · 2 answers · asked by The Uncanny Comic 5

Ballpark.
House fly landing on a desk?
Raindrop falling on a roof?
Snowflake falling to the ground?

2007-11-21 08:44:31 · 1 answers · asked by Ejsenstejn 2

please tell me the measurement it is in and how much is it

2007-11-21 07:39:19 · 6 answers · asked by Say Vut! 2

What effect does air resistance have on a falling object?

a.) increase in kinetic energy

b.) decrease in kinetic energy

c.) increase in potential energy

d.) none of the above


I picked (b). Why am I right/wrong?

2007-11-21 06:51:30 · 4 answers · asked by Anonymous

bigger than our sun and capable to create a massive dent in the space/time coordinate plane,due to it's gravity, could we essentially move from point A on one side of the coordinate plane to point B in a much shorter time? Basically from one side of the massive object to the other, in other words.

This is the law of general relativity, right?

2007-11-21 06:34:19 · 3 answers · asked by Jansen J 4

Husband is a major genius. Degrees in physics and engineering. I have no idea what to buy him for Christmas. He's into robots and his computer, but I don't know enough specs on either one to make intelligent shopping choices for him. I kind of feel like a gift card is a cop out. Any ideas for something engaging to the intellectual type? (p.s. he's not into gaming)

2007-11-21 06:14:01 · 10 answers · asked by awakeatdawn 3

Romeo is chucking pebbles gently up to Juliet’s
window, and he wants the pebbles to hit the window with
only a horizontal component of velocity. He is standing at
the edge of a rose garden 4.5 m below her window and 5.0 m
from the base of the wall ( as in the lower Fig). How fast are
the pebbles going when they hit her window?

2007-11-21 06:05:35 · 2 answers · asked by Anonymous