Physics - April 2007

When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, its frequency is 10.1 Hz. When another object of mass m2 is hung on the spring along with m1, the frequency of the motion is 3.82 Hz. Find the ratio m2/m1 of the masses.

2007-04-20 06:52:25 · 1 answers · asked by Anonymous

2007-04-20 06:43:57 · 3 answers · asked by shahid h 1

2007-04-20 06:41:17 · 3 answers · asked by shahid h 1

Carbon is a light element but one atom is combined with two atoms of oxygen to form one atom of carbon dioxide which is heavier than either oxygen or nitrogen, how long will it take to alter atmospheric pressure to a signicant degree? Are we not in danger of suffocating in a thick layer of carbon dioxide before extreme global warming takes place?

2007-04-20 06:40:38 · 2 answers · asked by johnandeileen2000 7

i read it in my book that mass of an object changes when it move comparable to velocity of light but it is not mentioned there that y does it happens and how does it happens? and what are its consequences? if u can plzz help me with it...

2007-04-20 06:38:43 · 5 answers · asked by gaurav g 1

2007-04-20 06:18:04 · 6 answers · asked by shahid h 1

So the law of reflection states that light incident on a surface should reflect away at the same angle to the normal as it came in at. But why should this be the case? Why, if it came in at 30 degrees to the normal, can't it leave at 58 degrees or something? And as far as I have been taught, reflection would just be a photon increasing the energy of an electron, which then loses that energy re-emitting the photon. So why does the photon have to be emitted at these specific angles?

2007-04-20 06:14:56 · 2 answers · asked by The D 1

If you can also explain physics.

2007-04-20 06:07:16 · 8 answers · asked by Xer X 1

1) Horizontal cylinder (open at the one end) revolves around a vertical axis passing through its open end, on a constant angular speed s. If the surrounding air is an ideal gas of molecular weight M and pressure p, what is the pressure inside the cylinder?

2) A container of volume V contains ideal gas under initial pressure p0 and is connected to a rotational pump of actual volume ΔV. If during pumping the gas temperature remains constant, what is the pressure inside the container after N rotations of the pump.

How do you solve the above? Thanks.

2007-04-20 05:52:04 · 2 answers · asked by Anonymous

2 identical blocks tied together w/ a string which passes over a pulley at the crest of inclined planes, one makes an angle theta1 = 26 degrees to the horizontal, the other makes the complementary angle theta2 = 64 degrees.

a) if there is no friction anywhere, with what acceleration do the blocks move?

b) if each block has a mass m=0.6 kg, what is the tension in the string while they are both moving?

c) suppose the coefficient of sliding friction between the blocks and planes is mew= 0.02. With what acceleration do the blocks move?

2007-04-20 05:49:12 · 2 answers · asked by 2badcats 2

how would you know, and would that constitute A.I.?

2007-04-20 05:45:09 · 4 answers · asked by raymond b 1

Does actual time change as the speed of light is approached, or does only measured time change?

Im not sure if it only affects how fast the clocks tick or if it changes rate at which time is moved through

2007-04-20 05:22:08 · 9 answers · asked by nkarasch 2

why is the speed of light sometimes referred to in the context of a vacuum? It seems to imply that the speed of light changes depending on if its in a vacuum or not. is the speed of light not constant no matter what the situation?

2007-04-20 05:05:43 · 8 answers · asked by Anonymous

In a container of negligible mass, 0.045 kg of steam at 100 degrees C and atmospheric pressure is added to 0.170 kg of water at 49 degrees C. If no heat is lost to the surroundings, what is the final temperature of the system?

2007-04-20 04:47:57 · 3 answers · asked by snowprincess823 2

What is minimal density of soild uniform 60-degrees cone,
which can float on the surface of water with its axis vertical
and tip under the water.

60-degrees cone is made by rotating equilateral triangle
around its axis of symmetry.

2007-04-20 04:39:26 · 4 answers · asked by Alexander 6

2007-04-20 04:23:19 · 12 answers · asked by lovefun 3

2007-04-20 04:05:14 · 8 answers · asked by kiek 1

0.5mm
Assume the Silicon crystal is fully depleted due to application of a voltage of 200v.(select the nearest answer)
OPTIONS:
200
20
16200
1630

2007-04-20 03:50:12 · 1 answers · asked by animesh s 1

The distance of closest approach is of the order of
OPTION:
1 Armstrong
10^(-10) cm
10^(-12)cm
10^(-15)cm

2007-04-20 03:47:55 · 1 answers · asked by animesh s 1

and in case this refers to a graph, does the graph then look like a curve as the name implies or could it also be a straight line??

2007-04-20 03:36:49 · 4 answers · asked by Shawn 1

2007-04-20 03:05:40 · 7 answers · asked by kirztel 1

in the water but my hand is dry & I reach out to turn it down? What if my hand is a little wet?

2007-04-20 02:51:58 · 9 answers · asked by autumn 5

A 0.5-kg aluminum teakettle contains 3 kg of water at 23°C. How much heat is required to raise the temperature of the water (and kettle) to 100.0°C?

2007-04-20 01:09:07 · 1 answers · asked by Anonymous

A bubble rises from the bottom of a lake of depth 80 m, where the temperature is 2°C. The water temperature at the surface is 17°C. If the bubble's initial diameter is 1.00 mm, what is its diameter when it reaches the surface? (Ignore the surface tension of water. Assume the bubble warms as it rises to the same temperature as the water and retains a spherical shape. Assume Patm = 1.0 atm.)

2007-04-20 01:08:20 · 1 answers · asked by Anonymous

Is this scientifically proven?

Or is it the other way round - when you think of something a lot, it would happen....

2007-04-20 00:41:09 · 3 answers · asked by sweet_sunshine 2

2007-04-20 00:10:00 · 1 answers · asked by shafqat b 1

A sign is suspended by two wires. Wire 1 makes an angle of 43.0° with the roof, and wire 2 makes an angle of 55.0° with the roof. The sign has mass 42.8 kg. Find the tension in wire 2 in N.
I already know the answer for this which is 310N but I can't figure out how to actually get this - please help

2007-04-19 23:40:09 · 2 answers · asked by Minty 1

2007-04-19 22:43:24 · 6 answers · asked by Anonymous

if the sound intensity at 2 metres from a source is 90dB, what is the sound intensity at 6 metres from the source??

i have worked it out but need to know if it is correct. would you need to use a formula for this calculation?

2007-04-19 21:30:11 · 4 answers · asked by Anonymous

i'm soo stuck.. thanx for those who help out =]
Two tanks are engaged in a training exercise on level ground. The first tank fires a paint-filled training round with a muzzle speed of 257 m/s at an angle 15.0 degrees above the horizontal while advancing toward the second tank with a speed of 13.5 m/s relative to the ground. The second tank is retreating at a speed of 32.0 m/s relative to the ground, but is hit by the shell. You can ignore air resistance and assume the shell hits at the same height above ground from which it was fired.

1. Find the distance between the tanks when the round was first fired.
Take free fall acceleration to be g = 9.80 m/s^2.

2. Find the distance between the tanks at the time of impact.
Take free fall acceleration to be g = 9.80 m/s^2.

2007-04-19 21:01:26 · 5 answers · asked by ohsnapps 2