Physics - March 2007

2007-03-31 06:14:36 · 1 answers · asked by goring 6

2007-03-31 06:02:51 · 5 answers · asked by Princess Mia 1

2007-03-31 04:35:51 · 5 answers · asked by Anonymous

I, like many others at the moment, have been set a peice of work to plan an investigation into how light intensity of a bulb emmitting similar light to sunlight (specialist bulb for growing plants) changes at its different wavelengths. I would very much appreciate it if someone could find for me a table or graph with a number of wavelengths in nm, and their corresponding intensities in kW/m2/s or similar, for sunlight. Also, if anyone has any more general tips for how to conduct the experiment, I would be very pleased to hear them. My plan so far is simply to use filters to get light of a specific wavelengths and then use a multimeter to measure the resistance of an LDR near to the light, as an indication of light intensity of that wavelength. Most important thing though, is to get a table/graph of some preknown values. Thanks very much.

2007-03-31 04:29:40 · 3 answers · asked by Anonymous

reference to newton's laws should please be included

2007-03-31 03:17:34 · 3 answers · asked by Chicken Man 1

Plasma is still mysterious because it has never been existed in the Earth. Actually, how can the scientist know about plasma? And by how?

2007-03-31 01:49:38 · 6 answers · asked by Esther B 1

i can see the future you may not believe me but all i see in my dreams comes true just one month ago i could see everything but now it starts to leave me. what can i deo to keep it

2007-03-31 00:04:36 · 5 answers · asked by Luka D 1

can the elements ever be converted back into metal? Or are they destroyed forever, and if so, what happens to the elements?

2007-03-30 20:42:28 · 2 answers · asked by careercollegestudent69 4

A rotating flywheel can be used as a method to store energy. If it is required that such a device be able to store up to a max of 1.00 x 10^6 J when rotating at 400 rad/sec, what moment of inertia is required?

2007-03-30 20:17:36 · 2 answers · asked by Dan S 1

The bolts on a car wheel require tightening to a torque of 90(N)m. If a 30 cm long wrench is used, what it the magnitude of the force required when the force is perpendictular to the wrench?

2007-03-30 19:59:53 · 3 answers · asked by Dan S 1

Have not tried it yet has anyone ever released normale size ballons with notes on them to see how far they would travel. I am just curious.

2007-03-30 19:57:41 · 4 answers · asked by Joe B 1

A 4.0kg object is mving at 5.0m/s SOUTH.It strikes a 3.0kg object that is moving WEST at 2.0m/s. The objects have a completely inelastic (stick together) collision. What is the kinetic energy lost in the collision?

2007-03-30 19:38:54 · 2 answers · asked by Anonymous

Can you explain to me Stephen Hawkings theory on black holes, in terms that a 16 year old would understand. I watched something about him, and his theories, but I didnt get to watch all of it.
Something about information being lost?
He also believed that if a person was in a black hole, they wouldnt feel anything, or something. I am not sure. But it was interesting, and would like to know more, in simple terms of course =)

2007-03-30 19:22:22 · 4 answers · asked by artgirl 1

I'm a bit confused about how gravity affects time. If gravity does affect time, does that mean all time calculations are relative to the Earth?

If I remember correctly, Einstein used electrical chronometers to conduct this experiment. So couldn't one say the reason why stronger gravitational field affects time(or really these electrical chronometers) is because it required more force for electrons to move through the circuit since they have mass?

I'm sure this is wrong as there are other crucial factors to consider, and I hope someone could provide a clearer answer to this topic.

2007-03-30 18:39:20 · 4 answers · asked by Anonymous

A 12.0 kg block (m1) is on an 29degree incline. It is attached to a 10.0kg block (m2) by a massless cable streched over a massless, frictionless pulley. Both blocks are at a height of 1.5m when released.
Assume the ramp has a kinetic friction coefficient of 0.320
a) What is the speed of the masses just before m2 hits the ground?
b)What is the total Kinetic Energy of the system just before m2 hits the ground?
c)Find the total mechanical energy just before m2 hits the ground.
d)How much energy is lost due to friction?

2007-03-30 18:13:35 · 2 answers · asked by Emma 1

2007-03-30 17:13:58 · 6 answers · asked by Daredevil 3

choose the correct alternative-
Q-An ice piece floats on pure water in a container fileed upto its rim.On melting of ice piece:-
1-the extra water will flow out of the container
2-the level of the water in th container will fall.
3-neither water will flow out nor the level of the water in the container will fall.
4-the water will flow out of the container as well as the level of the water in the container will fall.
please,answer the question if u really know it,just make ur answer sure and don't guess.Do not create a confusion.

2007-03-30 16:26:28 · 12 answers · asked by Anonymous

1. there are two permanent magnets which are NOT identical and are located close to each other.

How to calculate the force between them?

2. there are a permanent magnet and a steel nail located close to each other.

How to calculate the force applied on the nail by the magnet?

Is there any formula or equation to calculate the force?

Thanks

2007-03-30 13:25:16 · 1 answers · asked by ___ 4

I smell a conspiracy.

Inspired by Ear of Corn.

2007-03-30 12:41:44 · 4 answers · asked by Anonymous

A typical 3.5 V alkaline D battery is rated at 2.3 amp-hours. What is the power that can be expanded by the battery in watts?

2007-03-30 12:39:25 · 2 answers · asked by snake_hunter469 2

2007-03-30 12:38:25 · 15 answers · asked by cai 2

Would a lightbulb traveling at light speed create light that travels at twice that speed to an outside observer, or would the light just slow as it entered the regular spacetime?

2007-03-30 12:31:11 · 12 answers · asked by Luis 6

If I were in a ship at light speed, or close to it, and I shot a projectile out of the front, so it moved faster than the ship outwards, would it be able to go faster, or would it slow down the ship?

2007-03-30 12:21:27 · 4 answers · asked by Luis 6

If one were in a ship traveling at light speed, would that ship create a gravity disturbance because of said speed?

2007-03-30 12:18:10 · 2 answers · asked by Luis 6

So I know of the 4 main dimensions, but is there a 0d, which would be the vector for building the others?

As in, it would be the dimension where the others meet?

I hope this makes sense.

2007-03-30 12:17:01 · 6 answers · asked by Luis 6

A spacecraft has a nonrelativistic (or classical) momentum whose magnitude is 1.80 x 10^13 kg*m/s. The spacecraft moves at such a speed that the pilot measures the proper time interval between two events to be one-half the dilated time interval. Find the relativistic momentum of the spacecraft.

2007-03-30 11:12:57 · 4 answers · asked by christian m 2

in an electrochemical cell,why is the cathode placed at the left and the anode at the right,and hw do we identify the electrodes?

2007-03-30 10:47:28 · 2 answers · asked by snowman 2

If the earth has a spacific mass which gives it a spacific gravity, we know that. If you take millions of tons of metal off the earth (in the form of satillites thus reducing its spacific mass) would this in turn effect the earths orbit around the sun?

2007-03-30 10:32:23 · 7 answers · asked by Anonymous

2007-03-30 09:46:34 · 5 answers · asked by mysterious_qt 2

what?

a. 0.27 V
b. 3.75 V
c. 22 V
d. 240 V

2007-03-30 09:37:57 · 10 answers · asked by mysterious_qt 2