Physics - March 2007

The cosmoclock 21 ferris wheel in japan has a diameter of 100 m. Its name comes from its 60 arms which can function as a second hand (so that it makes one revolution every 60 sec)

a) Find the speed of the passengers when the ferris wheel is rotating at this rate.

b) A passenger weighs 882 N at the weight-guessing booth on the ground. What is the apparent weight at hte highest and at the lowest point in the ferris wheel?

c) What would be the time for one revolution if the passenger's apparent weight at the highest point were zero?

d) What then would be the passenger's apparent weight at the lowest point?

2007-03-15 18:33:49 · 3 answers · asked by pookie 1

2007-03-15 18:26:00 · 9 answers · asked by Neeraj A 1

Why a broken glass cannot be reunited again?
I've heard there's some physics laws that will be violated
if this happens. So it cannot happen. Could you please
explain me why????

2007-03-15 18:20:31 · 7 answers · asked by Anonymous

The height of the falls is about 51 meters. Assuming that the energy conversion is highly efficient, approximately how much energy is obtained from one kilogram of falling water?

2007-03-15 18:16:35 · 1 answers · asked by lank s 1

This is a scientific question on why does matter matter? matter is something that consists of everything. so why does matter matter?

2007-03-15 18:13:59 · 4 answers · asked by Anonymous

The cosmoclock 21 ferris wheel in japan has a diameter of 100 m. Its name comes from its 60 arms which can function as a second hand (so that it makes one revolution every 60 sec)

a) Find the speed of the passengers when the ferris wheel is rotating at this rate.

b) A passenger weighs 882 N at the weight-guessing booth on the ground. What is the apparent weight at hte highest and at the lowest point in the ferris wheel?

c) What would be the time for one revolution if the passenger's apparent weight at the highest point were zero?

d) What then would be the passenger's apparent weight at the lowest point?

2007-03-15 18:06:50 · 1 answers · asked by pookie 1

During 3 hours one winter afternoon, when the outside temperature was 7° C (32° F), a house heated by electricity was kept at 19° C (68° F) with the expenditure of 60 kwh (kilowatt·hours) of electric energy.

2007-03-15 18:03:16 · 2 answers · asked by lank s 1

2007-03-15 17:55:45 · 10 answers · asked by Anonymous

why does a pure ensemble at t=0 cannot evolve into a mixed ensemble as long as the time evolution is governed by the Schrodinger equation?

(if it is proven mathematically, please show me...)

2007-03-15 17:43:04 · 1 answers · asked by MITIJAH 1

2007-03-15 17:37:05 · 7 answers · asked by Luis G 1

I don't really need the answer, just how you would figure it out:
one force of 60 N and a second of 30 N act on a point P, what is the magnitude of the resultant when the angle between them is 45 degrees, o degrees, and 180 degrees. thank you

2007-03-15 17:07:30 · 4 answers · asked by skybluu 2

2007-03-15 16:44:29 · 4 answers · asked by mS. e 1

2007-03-15 16:42:58 · 3 answers · asked by mS. e 1

2007-03-15 16:40:40 · 2 answers · asked by mS. e 1

Why don't they make tin cans square so they can be stacked more easily in garbage cans?

2007-03-15 16:34:11 · 3 answers · asked by racecars 1

Okay so if you have been following me around the web you probably now I have a growing obsession with Eureka Seve. It seems everyday know I wake up and wish I was Renton with his reff board...But anyway

Is it Possible at all to make a hover board? I was thinking maybe some magnet that repels the earths field enough to float above it or something

but give me your ideas and please don't say that old hovercraft idea because I've tried that and I got about 1/2" of lift

2007-03-15 16:05:42 · 3 answers · asked by ? 2

Okay, so I have a problem on my hw worded like this:
Once a 30 kg crate is in motion on a horizontal floor, a horizontal force of 50 N keeps the crate moving with a constant velocity. The acceleration of gravity is 9.81 m/s^2;
What is the coefficient of kinetic friction between the crate and the floor?

My solution:
I basically took the equation that states that the coefficient of kinetic friction equals the force of the friction divided by the mass times acceleration.
So, I did this: Coefficient= 50/ (30*9.81).

Does this make any sense?

2007-03-15 16:02:21 · 5 answers · asked by Nikita R 2

562 N trunk is on a frictionless plane inclined at 30 from horizontal. find the acceleration and direction

2007-03-15 16:01:26 · 2 answers · asked by skybluu 2

2007-03-15 15:59:41 · 4 answers · asked by morpheus2485 1

A planet was discovered orbiting around the star HD68988. Its orbital distance was measured to be 10.5 million kilometers from the center of the star, and its orbital period was estimated at 6.3 days. What is the mass of HD68988?Express your answer in kg and in terms of our sun's mass.

2007-03-15 15:55:24 · 2 answers · asked by Anonymous

A bicycle rider accelerates from rest up to full speed on a flat, straight road. The frictional force between the road and the tires pushing her forward is f1. The air drag (and other frictional forces) pushing back is f2. What relationship would f1 and f2 have in the first few seconds of the ride then After she has reached full speed?

My answer: For the first one, I thought F2 would have been greater than f1, but then I realized that if it was, it would have been going backwards, so I decided that f1 is greater than f2 because it is moving forwards. Then, for the second part, I think that after she has reached full speed, it would be f1=f2, but I don't really have any reasoning. I just assumed that at that point, they'd be equal.

Any help or suggestions for figuring it out (please don't just give me an answer; I really need help understanding this stuff).

2007-03-15 15:34:10 · 3 answers · asked by Nikita R 2

I have read that the "Dark adapted eye" can detect single photons. What is the "dark adapted eye"?

2007-03-15 15:32:38 · 1 answers · asked by Larry K 1

2007-03-15 15:29:18 · 2 answers · asked by fAtiN hAsEgAwA 1

Okay. So two clocks are synchronized on Earth and set to t=0. One clock is left behind and the other is put on spaceship that travels at 0.5c for 100 light years, turns around then comes back. Ignoring all the acceleration nonsense while the ship turned around to head back to Earth, when the ship gets back, how much time would have passed on the clock that was always on Earth, and how much time would have passed on the clock that traveled through space?

I know that time dilation is:

t = t0 * (Gamma) or t = t0 / Sqrt(1-(v/c)^2)

But I don't fully understand which clock is described by which variable, t or t0. Any help that would assist me in understanding this would be great. :)

2007-03-15 15:18:51 · 2 answers · asked by frostwizrd 2

HI HELPER! HELLO, MY NAME IS ZALAK AND AND I NEEDED SOME HELP IN CHEMISTRY,MY TEACHER TEACHES FROM HIS OWN METHODS BUT THE FORMULAS HE HAS GIVEN DOES NOT SEEM TO MAKE SENSE: Could someone show me how to work the problems&answers I have a quiz*

My first question:
The generator at a power plant produces 23200V AC. A transformer steps that up to 432000V AC. If there are 2860 turns on the primary, how many turns are on the secondary coil?

-All I know is that the ratios are equal but I do not get it!

My 2nd problem:

Find the wavelength of a 5850000Hz radio waveof a 5850000Hz radio wave. Answer in_______m

-All I know is that wavelength = speed of light (C) / frequency (v)
Speed of light = C = 3.0 x 10^8, but how do I get my answers in "m" the answer I got is 51.282 (is that correct?)

3rd ?::::

A piece of iron is heated to 770 degrees oC. At what wavelength does the emitted radiation peak?
answer must be in_________m


(I have no idea where to start) HELP PLEASE!

2007-03-15 15:14:06 · 5 answers · asked by Zalak 1

if both sleds have the same kinetic energy which sled is moving faster? explain

2007-03-15 15:03:34 · 2 answers · asked by michael f 1

connected to a 2.4 kV (rms) 740 Hz line? ohms

(b) What will be the peak value of the current? A

2007-03-15 14:32:16 · 1 answers · asked by Jade m 1

Ignore resistance.
a.)Calculate the impedance of the coil.
kohms

b.)Calculate the rms current in the coil.
mA

2007-03-15 14:30:29 · 3 answers · asked by Jade m 1

Help w/ this would be awesome! I know it is supposed to be easy but I keep getting the wrong answer : ( ......

2007-03-15 14:27:28 · 2 answers · asked by Jade m 1

it's weight it 9800 N. the buoyant force on it is 12 N. the downward force is stronger. what is the net force and in which direction? im confused :S. is it 9800-12N downward, or just 0 N?

2007-03-15 14:14:27 · 6 answers · asked by Anonymous