Physics - October 2006

2006-10-23 00:38:11 · 5 answers · asked by niha 1

its between Conduction convection and radiation.

2006-10-23 00:33:56 · 5 answers · asked by gem--b 1

in 2nd law of dynamic(Newton's) we have: F=ma so if F=0 ---> then a=0 ---> V= cte
which is the 1st law, right? ( if F=0 then V = cte )
why did Newton separate these 2? doesn't the second law include the first one?

2006-10-23 00:25:05 · 2 answers · asked by sweetdreams 2

2006-10-23 00:01:40 · 9 answers · asked by Anonymous

capacvitance,inductance are worked in ic's .wt about the inductance

2006-10-22 23:29:48 · 2 answers · asked by sura 1

2006-10-22 23:24:42 · 5 answers · asked by mini_elliso 1

i was told that the electrons wont flow if the pressure is high; is this true? if so, why?

2006-10-22 23:18:33 · 7 answers · asked by Anonymous

Why doesn't your head appear at the bottom and your feet at the top?

2006-10-22 23:08:08 · 10 answers · asked by Mez 6

I need to change the armature inside the DC motors and test them. Where might I find materials for this project?

2006-10-22 21:53:54 · 3 answers · asked by Anonymous

2006-10-22 21:35:22 · 17 answers · asked by shridhi 1

Ice... how did they make it in the 19th Century.... Maybe I am just being thick, but they didn't have freezers or compressors (I think) and whilst we take frozen food / ice for granted, I was wondering how they actually created ice in the first place, or did they ?

2006-10-22 20:58:52 · 9 answers · asked by Andy T 1

i need to make a model on it.

2006-10-22 18:44:38 · 1 answers · asked by xyz123 1

I understand that Radio Controlled watches that always tell the correct time do not operate in Australia because there is no service provider. Does anyone know if this service will become available in the future? Does anyone know of any phone operators that provide the exact time directly to the phone? When GPS is available on our phones, will the exact time be available then?

2006-10-22 18:29:53 · 1 answers · asked by Anonymous

2006-10-22 17:23:20 · 2 answers · asked by hmmm 1

I need to build an electric motor without any permanent magnets with a power source no greater than 9V any help including diagrams would be greatly appreciated. Thankyou

2006-10-22 16:45:44 · 4 answers · asked by TT 1

A black hole is supposed to have huge gravitational force. So big that light particles cannot escape the force. So what happened to the particles? Are they just floating there, not moving anywhere, or are they got pulled toward the black hole? If they got pulled, than the force is supposed to give acceleration bigger than the speed of light, right?. Then if an object moves toward the black hole, and got pulled, can that object be faster than the speed of light? (ignoring the fact that the object should be crushed apart by the huge gravitational force)

2006-10-22 16:43:18 · 5 answers · asked by Marcus 2

are all cf light bulbs full spectrum?

2006-10-22 16:22:08 · 5 answers · asked by sikn_shadow_420 3

Can anyone explain how to work out a problem like this?
1. A person throws a ball vertically downwards from the top of a building. the ball leaves the throwers hand with a speed 10 meters/second

A. Whats it the speed after 1 second? 2? 3 ?
B. How far does it fall in 1 second? 2? 3 ?
C. What is the magnitude of its veclocity after falling 10 meters ?

2006-10-22 15:51:49 · 6 answers · asked by twistoffate2099 4

1. A worker pulls a sled with a force of 80 N directed at an angle of 60 degrees above the horizontal over a level distance of 6 m. If a frictional force of 24 N acts on the sled in a direction opposite to that of the worker, what net work is done on the sled?

a. 240 J, b. 216 J, c. 144 J, d. 96 J


2. A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:

a. momentum is conserved in this process
b. the fuel pushes on the ground
c. air friction pushes on the escaping fuel
d. the downward force of gravity is less than the downward momentum of the fuel

please explain why you believe the answers are what they are just in case yours are different than mine. thanks a lot guys!

2006-10-22 15:39:45 · 1 answers · asked by Anonymous

How is it determined which object is moving and which is static. Aren't they both moving relative to each other? In which case, how is it determined which time frame is moving faster -- and which is slower?

2006-10-22 15:16:57 · 5 answers · asked by DAVID W 1

without having to draw a velocity-time graph?

2006-10-22 14:59:33 · 4 answers · asked by Kurosagi 1

Consider two falling bodies. Their masses are 1.8 kg and 6.2 kg. At time t = 0, the two are released from rest. What is the magnitude of the velocity of their center of mass at t = 1.2 s? Ignore air resistance.

This is like another one I have found on here, but the masses in that one are the same.... help!

2006-10-22 14:57:55 · 4 answers · asked by L F 2

a 5 kg block rests on a 30-degree incline. the coefficient of static friction between the block and the incline is 0.20. How large a horizontal force must push on the block if the block is to be on the berge of sliding (a) up the incline and (b) down the incline?

2006-10-22 14:17:24 · 1 answers · asked by anti 1

An LR circuit is hooked up to a battery , with the switch initially open. The resistance in the circuit is R=140 Ω, the inductance is L=2.40 H, and the battery maintains a voltage of E=48.0 V. At time t=0 the switch is closed

How much work has the battery done from the time the switch was closed until t=2.54E-2 s?

I know that you must integrate the power (P=VI) over the time interval to get the total work done by the battery, but I can't seem to get the right answer.

2006-10-22 14:05:37 · 1 answers · asked by eltel2910 1

The bullet is fired at a block while the block is at rest (the block is at the lowest swing point). Once the bullet hits the block it rises to its highest point swing. The maximum height the pendulum rises is 3cm, at this max height the pendulum subtends an angle of 36.9 degress. The mass of the bullet is 80g and the mass of the pendulum bob is 911g. Acceleration of gravity is 9.8m/s^2. What is the initial speed of the projectile(answer in units of m/s)?

2006-10-22 13:56:56 · 1 answers · asked by Anonymous

In the railroad freight yard, an empty freight car of mass m rolls along a straight level track at 1 m/s and collides with an initially stationary, fully loaded boxcar of mass 3.5m. The two cars couple together upon collision.

(a) What is the magnitude of the velocity of the two cars after the collision?

(b) Suppose instead that the two cars are at rest after the collision. With what speed was the loaded boxcar moving before the collision if the empty one was moving at 1 m/s?

2006-10-22 13:52:39 · 2 answers · asked by Anonymous

The pendulum bobs in the figure below are made of soft clay so that they stick together after impact. The mass of bob A is half that of bob B. Bob B is initially at rest. What is the ratio of the kinetic energy of the combined bobs, just after impact, to the kinetic energy of bob A just before impact?

2006-10-22 13:49:35 · 2 answers · asked by Anonymous

Then u turn ur headlights on would u be able to see where u are going?

2006-10-22 13:49:11 · 28 answers · asked by rachxx 1

A hockey puck moving along the +x axis at 0.41 m/s collides into another puck that is at rest. The pucks have equal mass. The first puck is deflected 35 below the +x axis and moves off at 0.38 m/s. Find the speed and direction of the second puck after the collision.

2006-10-22 13:41:49 · 1 answers · asked by Anonymous

A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor?

2006-10-22 13:14:58 · 2 answers · asked by activegirl 1