Physics - October 2007

Find the ratio of the rotational inertia of the Earth for rotation about its own axis to its rotational inertia for rotation about the Sun.

2007-10-20 06:12:20 · 1 answers · asked by Bob P 1

What is circular motion and centripetal force? What causes them to have this motion?

2007-10-20 05:36:28 · 3 answers · asked by Anonymous

if you press a book flat against a vertical wll with your hand, in what direction ist he friction exerted by the wall on the book?
a)downward
b)upward
c)out from the wall
d)into the wall
is it d into the wall?

2007-10-20 05:18:33 · 6 answers · asked by ? 2

A 1.80m tall basketball player attempts to make a shot 13.40m from the basket ( the basket is 3.05m high). The accleration of gravity is 9.81 m/s2. If he shoots the ball at a 48 degree angle, what intial speed must he throw the basketball so that it goes through the hoop without striking the backboard. Answer in m/s.

2007-10-20 05:11:42 · 1 answers · asked by akanthasy 1

2007-10-20 05:01:56 · 8 answers · asked by Mojo Ryzin 5

Give a reason for your answer!!

2007-10-20 04:45:42 · 5 answers · asked by Anonymous

Hi, sorry about this, it's just i'm revising, and I don't understand nuclear fission.

Apparently I have to know how you can get energy from nuclear fission. I know what it is, and i know how it work etc, but i don't get the nuclear reactor/obtaining energy part.

Please can someone help me?!?!

2007-10-20 04:41:01 · 14 answers · asked by Anonymous

2007-10-20 04:39:46 · 2 answers · asked by ? 3

Explain how Newtons law 2 contains Newtons law 1 within it? (in other words, how does Newtons law 2 “include” Newtons law 1. How is Newtons law 1 is just a special case of the Newtons law 2 relationship?)

please answer, thanks

2007-10-20 04:22:18 · 5 answers · asked by Anonymous

2007-10-20 04:11:12 · 2 answers · asked by morin o 2

A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initiall angular position andd a final angular position of the rigid body. Which of the sets can occur only if the rigid body rotates through more than 180 degree?
a) 3 rad, 6 rad
b) -1 rad 1 rad
c) 1 rad 5 rad

** I think it is B, but I am not sure. Could someone please help me out and also show me how they got the answer.
THANK YOU

2007-10-20 02:43:01 · 6 answers · asked by markeesha h 1

Which its nature.. It is of electromagnetic origin?

2007-10-20 02:27:10 · 4 answers · asked by Rossetto 4

Hi, this has probably been asked a million times, and I should know the answer but I am reading so many articles that I am completly confused! How does the forward motion of the car, gravity, air resistance and friction all effect a car going down a ramp, especially when you change the height of the ramp, its surface and the mass of the car? Have I moissed any froces out? Does any one know of any easy to read and digest books about this?

Thanks for any help
x

2007-10-20 01:50:11 · 1 answers · asked by kmsmith 1

2007-10-20 01:07:50 · 6 answers · asked by Anonymous

think if the quickest way between points a and b is a straight line and particle x moves between a and b in exactly 1 second using the course of a straight line, wouldnt particle z need to travel at a greater speed in order to travel as a wave and still cover the same amount of distance in the same about of time?? and an even greater speed for higher frequencies?

2007-10-19 23:10:18 · 5 answers · asked by Danny 1

plz describe

2007-10-19 20:45:48 · 9 answers · asked by Anonymous

2007-10-19 20:24:20 · 3 answers · asked by ishika m 1

A particular inductor has appreciable resistance. When the inductor is connected to a 16 V battery, the current in the inductor is 3 A. When it is connected to AC source with an rms output of 16 V and a frequency of 62 Hz, the current drops to 1 A. Find the impedance at 62 Hz. Answer in ohms.

2007-10-19 18:27:58 · 4 answers · asked by ncg 2

NOTE: Light waves are electromagnetic waves, NOT mechanical waves; however, the principles of energy and intensity for electromagnetic waves and mechanical waves are exactly the same. The following problem illustrates this idea. The problem could just as well have been a problem of sound with a given intensity falling upon your eardrum for a specified amount of time. GBA


Light of intensity 3 W/m2 passes through the pupil of one of your eyes and eventually falls on your retina. The radius of the pupil is controlled by the iris. In a human eye, the radius of the pupil can vary from about 1.0 mm to about 3.5 mm. The area of the opening can be calculated from pi (3.1416) times the radius squared. If your pupil is open to a radius of 3.5 mm, how much light energy passes through in one minute? Give your answer in mJ.

?mJ

2007-10-19 17:58:12 · 1 answers · asked by Anonymous

3) An ammeter uses a galvanometer and a shunt resistance of .20 W. The galvanometer has an internal resistance of 100 W. If 2.0A pass through the ammeter how much current enters the galvanometer?


4) A galvanometer has an internal resistance of 20 W and a full scale deflection 0.50 mA. If it has a 2.0 m W shunt resistor to make it an ammeter what is the full scale current? Draw the circuit.

2007-10-19 17:55:17 · 6 answers · asked by wzerocx 2

The bolts on a car wheel require tightening to a torque of 90 Núm is the beginning of the question so it should read
The bolts on a car wheel require tightening to a torque of 90 Núm. If a 30 cm long wrench is used what is the magnitude of the force required when the force is 53ø to the wrench

2007-10-19 17:54:18 · 2 answers · asked by MeDIGURU 1

here is my hypothesis: water with sugar dissolved in it evaporates more slowly than fresh water.(the more sugar the slower the evaporation) how could i test this experiment?(procedure)please give in good detail;]thankyou

2007-10-19 17:41:24 · 1 answers · asked by Anonymous

So i know that object #1 hits a wall at 42.16 m/s. Now, what other information do I need to know to find out the frequency of object #1 due to the vibrations of the collision with the wall?

And with that information, how do I find the frequency?

2007-10-19 17:40:12 · 2 answers · asked by 192839203 1

4) A battery with and EMF of 1.900V is connected to an external resistance of 120.0W and a current of 15.80 mA flows. What is the internal resistance of the battery?

2007-10-19 17:28:58 · 4 answers · asked by wzerocx 2

I am looking for energy changes and Newton's Laws

2007-10-19 17:27:10 · 1 answers · asked by Danan J 2

See these two articles:

http://news.bbc.co.uk/2/hi/science/nature/1196652.stm
http://www.thunderbolts.info/tpod/2005/arch05/050623impossible-dinosaur.htm

Purportedly, Earth's gravity would have had to have been 1/3 weaker than it is today for Dinosaur's to exist, apparent from some simple math applied to proportional muscle masses and strengths.

At the time the Dinosaurs existed, Earth's magnetic field was exactly 3 times stronger than it is today.

Gravity follows many of the same laws as magnetism at close distances.

I was just wondering if Gravity was really so mysterious, some result of invisible and undetectable forces or if it might just be the circulation of some particular particle, maybe we will soon be able to manipulate it like we do magnetism.

2007-10-19 17:19:59 · 5 answers · asked by Rockstar 6

Okay, so suppose something gets sucked into a black hole, it can't just disappear right? It must go somewhere, to a point in "nothing" like where it doesn't exist, yet it does, like perhaps another universe other than our own? Is that possible? How can something develop from absolutly nothing? I mean the Big Bang theory, how was it formed? Does the matter that gets sucked in black holes get stored away in "nothing" until it explodes and makes another dimension? Can dimensions collide with eachother? (If indeed other dimensions exist)

2007-10-19 17:01:43 · 6 answers · asked by pspkilla 4

You may assume that the multimeters are ideal.

2007-10-19 16:41:20 · 5 answers · asked by oopsy 1

you circle the earth and punch yourself in the back of the head?

2007-10-19 16:40:18 · 6 answers · asked by Anonymous

2007-10-19 16:38:24 · 1 answers · asked by Rockstar 6