Physics - April 2007

2007-04-02 19:18:17 · 5 answers · asked by Anonymous

What effects would there be for a nuclear detonation in the atmosphere?

2007-04-02 18:52:25 · 2 answers · asked by The Dude Abides 2

Everything has a starting point what is nothing how do you get something from nothing

2007-04-02 18:52:24 · 9 answers · asked by JOHN E 1

among corpuscular and quantum theory which one is for particle nature of light?how is there any relation between two ?does electromegnetic theory combines both....please explain if you know

2007-04-02 18:30:07 · 2 answers · asked by Anonymous

2007-04-02 18:10:07 · 5 answers · asked by PCMCPPE 1

2007-04-02 17:20:22 · 2 answers · asked by Anonymous

Considering the fact that energy is quantized, shouldn't the spectrum of light also be quantized?

2007-04-02 16:11:36 · 3 answers · asked by tyrebrnr21 2

Imagine a lower leg being exercised. It has a 49-N weight attached to the foot and is extended at an angle Θ with respect to the vertical. Consider a rotational axis at the knee.(a) When Θ = 90.0 degrees, find the magnitude of the torque that the weight creates. (b) At what angle Θ does the magnitude of the torque equal 15N*m?

additional data:
distance from knee to foot: 0.55m

2007-04-02 14:45:43 · 1 answers · asked by lairdmanisland 1

A harmonic Wave travels in a wire with amplitude 5.43 mm, wavelength 0.476 m, and frequency 679 Hz.what is the sped of which the wave travels.

I used v= f(wavelength) to get 0.323 m/s
But I dont think its right because of the Amplitude
Can u help me out?

2007-04-02 14:40:23 · 3 answers · asked by TheThing 2

2007-04-02 14:23:13 · 2 answers · asked by Christina 1

Hi,

There is a 2.0 kg mass riding on top of a 3.8 kg mass as it oscillates on a frictionless surface with a period of 3.0 s. The upper block just begins to slip when the amplitude is increased to 50 cm. What is the coefficient of static friction between the blocks? The spring constant is 70 N/m.

I am having a hard time incorporating friction into my equations. I believe that I am supposed to use F=uN, w = (k/m)^.5 as well as w = 2(pi)f and V = wA. Any ideas on how to start this one?


Thanks!

2007-04-02 13:40:26 · 1 answers · asked by Anonymous

A solid cylinder (M=2.43 kg, R=0.131 m) pivots on a thin, fixed, frictionless bearing. A string wrapped around the cylinder pulls downward with a force F which equals the weight of a 0.570 kg mass, i.e., F = 5.592 N. Calculate the angular acceleration of the cylinder.

If instead of the force F an actual mass m = 0.570 kg is hung from the string, find the angular acceleration of the cylinder.

How far does m travel downward between 0.430 s and 0.630 s after the motion begins?

The cylinder is changed to one with the same mass and radius, but a different moment of inertia. Starting from rest, the mass now moves a distance 0.381 m in a time of 0.510 s. Find Icm (I sub cm) of the new cylinder.

2007-04-02 13:40:04 · 2 answers · asked by Anonymous

HI,
I was just wondering how much energy (roughly) if released in a fission bomb (hydrogen or Uranium/Plotonium - state which one though).

Thanks, = D

2007-04-02 13:24:49 · 1 answers · asked by Anonymous

would it come back down or have sufficient velocity to either get caught in th atomsfear and dragged out a while or even break out?

2007-04-02 12:52:24 · 11 answers · asked by pledger166 2

Yes, there can be oxygen in outter space you just have to be in a cabin of some sort with air. I beleive it would go dirrectly away from the closest strongest gravitional pull

2007-04-02 12:48:10 · 4 answers · asked by Stooret 1

2007-04-02 12:33:15 · 3 answers · asked by hello 1

One negative charge -Q is held in fixed position (x,y,z) = (1/4,1/4,1/4),
another charge is positive +2Q at (x,y,z) = (1,1,1).

What is the probablity that electron randomly placed
inside the cube 0

2007-04-02 11:41:53 · 3 answers · asked by Alexander 6

It is well known that light travels slower through water. If it could exit the other side as with a transparent tank, does it speed up again and if so where does the energy come from to accelerate it ?

2007-04-02 11:03:53 · 10 answers · asked by Anonymous

i need an experiment so that i have an exmple on a way to prove or test my hypothesis which is that gravity causes the speed of motion to slow

2007-04-02 11:00:21 · 9 answers · asked by TiTi 1

The guage pressure in each of the four tires of an automobile is 240,000 Pa. If each tire has a "footprint" of 220 cm^2, estimate the mass of the car.

2007-04-02 10:45:08 · 2 answers · asked by jr 1

When light travels from the sun it travels at the speed of light, it takes around 8 minutes to travel to earth. So if i was one light year away from the sun, does it take 1 year and 16 minutes (8 minutes to travel to earth and 8 back) to travel from the earth?

2007-04-02 10:26:22 · 7 answers · asked by James 1

2007-04-02 10:01:42 · 4 answers · asked by lil_wil 1

can u help me plz??????????????????

2007-04-02 09:58:28 · 2 answers · asked by M.K 2

If a powerful enough laser was shot in space at a ship, and both were moving, would it punch through the ship like a ballistic weapon or would it drag along the hull?

2007-04-02 09:51:51 · 10 answers · asked by Helix Tank 1

Driving in your car with a constant speed of 12 m/s, you encounter a bump in the road that has a circular cross section. If the radius of curvature of the bump is r = 31 m, find the apparent weight of a 65 kg person in your car as you pass over the top of the bump.

2007-04-02 09:49:57 · 2 answers · asked by Lenae 3

2007-04-02 09:32:52 · 7 answers · asked by Kain 5

A spring with a force constant of 130 N/m is used to push a 0.27 kg block of wood against a wall.
Find the minimum compression of the spring needed to keep the block from falling, given that the coefficient of static friction between the block and the wall is 0.37.

2007-04-02 09:31:07 · 1 answers · asked by Lenae 3

It is known that mass increases with velocity, and it becomes flatter ; but does its size increase also (does it become bigger)

2007-04-02 07:52:27 · 9 answers · asked by modah 1

2007-04-02 07:15:56 · 12 answers · asked by Anonymous

Small space module has circular orbit around the Earth
with period T = 2 hours. Astronaut in open space gear
(total mass M = 120 kg) is on exactly the same orbit
d = 90 m behind the module. After completing his
calculations, astronaut tosses his calculator (m = 200 g)
with certain velocity, and after time T/2 = 1 hour reaches
his module.

What was astronaut's solution (speed and direction of the toss)?

2007-04-02 07:06:39 · 2 answers · asked by Alexander 6