Physics - March 2007

What are some thing’s i should know or books i should study? What is it like? Is it fun or does it dull you out of your mind? I just need a general insight before i begin. Be brief.

2007-03-13 12:36:17 · 5 answers · asked by Anonymous

2007-03-13 12:30:54 · 3 answers · asked by savcan2 1

A rule for estimating the distance in kilometers between an observer and a lightning stroke is to divide the number of seconds in the interval between the flash and the thunder by 3.

What speed of sound is assumed by this rule?
the answer is supposed to be in km/s

2007-03-13 12:26:42 · 5 answers · asked by thatsfunnybunny 2

0.8 m above ground (Figure 8-66). If the bullet buries itself in the block, find the distance D at which the block hits the floor.

2007-03-13 12:24:56 · 4 answers · asked by Anonymous

Assume that we have a uniform, square metal plate with side L = 4.30 cm and mass 0.205 kg. The plate is located at (x,y) = (0,0) We remove a square from of the plate with side L/4 with lower left edge located at (x,y) =(0,0). What is the distance of the center of mass of the remaining plate from the origin?

I tried using this:
X (whole)=L/2; X (piece)=L/8
M (whole) is given; M (piece)=M (whole)/16;
Then, I used the formula X=( X whole*M whole-X piece*M piece)/(M*whole-M piece).

I believe that theY coordinate is equal to X because the sides of the
piece are the same.

Then, I took sqrt(X^2 + Y^2) to get the answer, but It is not correct.

Can anyone help? Thanks.

2007-03-13 12:13:37 · 1 answers · asked by Defcon6 2

When a sound wave propagates past a point in the air, what are the changes that occur in the pressure of air at this point?

Suppose you wish to produce a sound wave that has a wavelength of 8 m in room-temperature air. What would its frequency be?

A bat flying in a cave emits a sound pulse and receives its echo in 1.4 s. How far away is the cave wall?

2007-03-13 11:59:45 · 2 answers · asked by thatsfunnybunny 2

Directly in front of it, and moving with a velocity of +3 m/s, is a block of mass m2 = 9 kg. A massless spring with spring constant R = 1120 N/m is attached to the second block as in Figure 8-59.

a) Before m1 runs into the spring, what is the velocity of the center of mass of the system?

(b) After the collision, the spring is compressed by a maximum amount x. What is the value of x?

(c) The blocks will eventually separate again. What is the final velocity of each block measured in the reference frame of the table?

2007-03-13 11:36:52 · 1 answers · asked by Anonymous

i need the lower limit in Hz and the upper limit Hz

2007-03-13 11:32:20 · 4 answers · asked by thatsfunnybunny 2

I dont mean only somethings I mean all things.

Thanks

2007-03-13 11:20:16 · 8 answers · asked by psrzab 1

How would i go about answering these, is there website that could help?

A 4µf capacitor is connected in parallel with a 6µf capacitor. This arrangement is then connected in series with a 10µf capacitor. A supply p.d. of 250V is connected across the circuit.
Find
a)The equivalent capacitance of the circuit
b)The voltage Across the 10µf capacitor
c)The charge on Each capacitor

Cheers

2007-03-13 11:18:00 · 1 answers · asked by MoLeY 1

After the spring is released, the smaller mass has a velocity of 9 m/s to the left. What is the velocity of the object with the larger mass?

2007-03-13 10:56:17 · 2 answers · asked by Anonymous

Can it be that the heavens is spinning around the earth?Or do we just believe the people who seems to know everything,like who can actually say the earth is spinning........even when the astranauts do space walks,is it them that spin around the world or what???Just a thought......

2007-03-13 10:55:48 · 4 answers · asked by volley 2

2007-03-13 10:50:17 · 4 answers · asked by lilbabyapples7 1

Low pressure, high temperature, low dipole moments, high density, and/or strong intermolecular forces?

2007-03-13 10:31:39 · 2 answers · asked by Random G 3

2007-03-13 10:11:42 · 6 answers · asked by kohlirosy 1

do you think we will ever be able to stop light? ( if you turn on a flashlight an the light just stops a couple of feet from the flashlight. if you point it into the air ) do you think we can do it with a strong magnetic field?

2007-03-13 10:06:09 · 18 answers · asked by henry_o01 1

and a value of gA of 0.009x10-8 and 12x10-8, respectively. What is the most intense line for T=2000k, and T=5000K? At what temperature do the two lines have the same intensity?

2007-03-13 09:52:44 · 1 answers · asked by Hard Rocker 3

Please can you help me I have to do it for a science report due tom.
I just found out about it!

2007-03-13 09:23:25 · 5 answers · asked by ? 3

Can you figure it out???

2007-03-13 09:08:57 · 10 answers · asked by nothing 2

i neeed help

2007-03-13 08:55:09 · 7 answers · asked by Anonymous

What is the apogee?
How far away from the sun is the earth at the apogee?
What is perigee?
How far away from the sun is the earth at the perigee?

2007-03-13 08:54:55 · 2 answers · asked by Alastor 1

2007-03-13 08:52:46 · 5 answers · asked by craig k 1

The important thing to keep in mind is that I'm not talking about putting this in outer space, which is not a perfect vacuum, and where gravity from other objects must be taken into consideration.

If there was some physics equation that answers this question, I'd be super-appreciative!

2007-03-13 08:40:41 · 11 answers · asked by Eric L 2

The two wires in Figure P19.40 carry currents of 3.00 A and 5.00 A in the direction indicated. (a) Find the magnitude of the magnetic field at a point midway between the wires. (b) Find the magnitude of the magnetic field at point P, located 20.0 cm above the wire carrying the 5.00-A current.
http://www.webassign.net/sf5/p19_39.gif....

I have found the answer for part a) to equal 4.0e-6 can anyone confirm this. I need desperate help on part b

2007-03-13 08:30:10 · 1 answers · asked by Anonymous

2007-03-13 08:10:58 · 1 answers · asked by LaLa 4

Two air-track carts move toward one another on an air track. Cart 1 has a mass of 0.35kg and a speed of 1.2m/s.Cart 2 has a mass of 0.61kg. What speed must cart 2 have if the total momentum of the system is to be zero? Since the momentum of the system is zero. does it follow that the kinetic enery of the system is alos zero?

my answer: momentum=mass x velocity
.35 x 1.2= .42 so .61 x ?= 0.42
0 .69 is the speed of cart 2

kinetic energy= 1/2mass x velocity so
1/2(.61) x .69= 0.21

Am I doing this correctly?

2007-03-13 08:08:34 · 2 answers · asked by christy r 1

I thought it was resistance that causes heating in an electric circuit but apparently not.

2007-03-13 07:40:32 · 7 answers · asked by Em 1

so if light refracts of a raindrop would'nt that just form a small spectrum and refract of other rain drops until weird shaped spectrums are formed?? and why is it always in a arc shape?

2007-03-13 07:24:23 · 3 answers · asked by Gupert 1

What purpose does the intensity reflection coefficient play in ultrasound imaging? Similarly what purpose does the transmission coeffiecient have? How are these two quatities used, related and what function do they have in aiding a radiographer?

2007-03-13 07:23:51 · 1 answers · asked by luc_bugeja 1

I'm stuck on this physics question. There is a cylinder, full of water with three holes at different heights along the side. Water is constantly being pumped in to make up for any water coming out, so the water is at a constant height in the cylinder at all times.

Find the pressure at the top and the bottom of the cylinder.

I thought I would use Bernoulli's Equation, but i have no values for flow velocity or cross-section of the cylinder.

2007-03-13 07:23:46 · 3 answers · asked by Have_ass 3