Physics - March 2007

I really need this...plz oh plz!!!...thx

2007-03-05 05:24:40 · 11 answers · asked by ? 2

please help with my homework!!!!!! thank you

2007-03-05 05:18:37 · 7 answers · asked by Emma 1

2007-03-05 04:24:46 · 7 answers · asked by rumplestilts 2

2007-03-05 03:51:55 · 10 answers · asked by kungpow c 1

2. In longitudinal waves the medium
a. vibrates in a direction perpendicular to the direction of motion of the wave
b. vibrates in the same direction as the wave is moving
c. moves in a circular motion
d. doesn't vibrate, the disturbance just moves through the medium

3. What is it that travels through an elcetric circuit at nearly the speed of light?
a. electrons
b. protons
c. a potential difference
d. an electric field

4. consider an electrical transformer that has 10 loops on it's primary coil and 20 loops on it's secondary coil.. what is the coltage in the secondary coil if the primary is supplied with 120 V?
a. 120 V
b. 60 V
c. 240 V
d. 480 V

5. which of the following unit is actually a measure of rate?
a. volt
b. coulomb
c.amp
d. ohm

2007-03-05 03:49:49 · 4 answers · asked by Stacey lynn 2

2007-03-05 03:47:57 · 4 answers · asked by sankar s 1

2007-03-05 03:39:42 · 2 answers · asked by Krishnamachar Rangaswamy R 1

2007-03-05 03:35:59 · 2 answers · asked by sankar s 1

2007-03-05 03:23:37 · 7 answers · asked by forever_alone120 1

HI guys, I have the diagram in the link below, and I was wondering how would I do the following calculations?! In the figure shown, would there be any other stresses other than bending stress due to moment? I know there would be shear, but how would I calculate that? Also in the postion (12-6 o'clock) there wold be no torsion, right?

http://oregonstate.edu/~patelu/stress.JPG

Thanks!!

2007-03-05 03:19:32 · 1 answers · asked by abe_cooldude 1

A box of mass 12 kg sits on a level surface. The coefficient of friction between the box and the floor is 0.25. A rope attached to the box pulls it horizontally to the right with a force of 38N. What are all the forces acting on the box?

a) what is the magnitudes of the friction force?

b) what is the acceleration of the box?

c) if the rope maintains this same force for 3 seconds and the box starts from rest, how far does the box travel?

2007-03-05 02:57:42 · 1 answers · asked by ? 1

In the physics problems in my textbook, they give you a 'kinetic friction coefficient' that you can apply to kinetic friction situations at any speed. I was wondering if kinetic friction could be stronger or weaker at different speeds.

2007-03-05 02:57:13 · 3 answers · asked by Anonymous

I know that the displacement of water needs to be equal to the weight of the object but then why do some objects, like an anchor, sink straight to the bottom regardless of how much water is present.

2007-03-05 02:46:00 · 12 answers · asked by moose 2

A box of mass 12 kg sits on a level surface. The coefficient of friction between the box and the floor is 0.25. A rope attached to the box pulls it horizontally to the right with a force of 38N. What are all the forces acting on the box?

How do you think the magnitude of the normal force on the box compares to the weight of the box? Is this a Newton's third law force pair?

2007-03-05 02:44:42 · 2 answers · asked by ? 1

2007-03-05 02:27:15 · 3 answers · asked by Anonymous

2007-03-05 02:13:59 · 3 answers · asked by Anonymous

I'm having trouble with this question:

A spring with a spring-constant of 2.5N/cm is compressed 26 cm and released. The 2 kg mass skids down the frictional incline of height 12 cm and inclined at a 24 degree angle. The acceleration of gravity is 9.8 m/s^2. The path is frictionless except for a distance of 0.5 m along the incline which has a coefficient of friction of 0.5. What is the final velocity of the mass?

2007-03-05 01:44:07 · 2 answers · asked by krstilyzed 1

Can radio waves be harmful?

2007-03-05 01:43:50 · 6 answers · asked by Theophile 2

A neutron star has radius 10 km and mass 2.5 x 10^29 kg. A meteorite is drawn into its gravitational field. Calculate the speed with which it will strike the surface of the star. Neglect the initial speed of the meteorite.

-- do i just use the formula for escpae speed which is
V= sqrt(2GM/r)

2007-03-05 01:32:26 · 2 answers · asked by Jos M 1

2007-03-05 00:57:45 · 2 answers · asked by Ansherinah_19 1

2007-03-05 00:52:26 · 2 answers · asked by Ansherinah_19 1

2007-03-05 00:48:11 · 1 answers · asked by max f 1

2007-03-05 00:40:38 · 7 answers · asked by Ansherinah_19 1

On a spacecraft, two engines are turned on for 889 s at a moment when the velocity of the craft has x and y components of v0x = 5710 m/s and v0y = 6240 m/s. While the engines are firing, the craft undergoes a displacement that has components of x = 5.68 x 106 m and y = 6.91 x 106 m. Find the (a) x and (b) y components of the craft's acceleration.

2007-03-05 00:22:53 · 2 answers · asked by Anonymous

A mosquito was flying in a train (train speed=65 km/hr.) at a speed of 2 km/hr.
Note: the mosquito was flying continously with out sitting in any part of the train.

the question is " after one hour the mosquito was still found flying inside the train. how it is possible if the speed of train and mosquito are as said above.

2007-03-05 00:00:04 · 7 answers · asked by Anonymous

Rheostat is used in the experiment, and it has to be set to the maximum value before the switch is closed, why is it so?

2007-03-04 23:42:13 · 3 answers · asked by highupthesky 1

Where do I go to collect my nobel prize and share my theory?

2007-03-04 22:55:27 · 8 answers · asked by sfumato1002 3

So, Aluminium is stronger than steel. But what other metal is stronger, lighter and also heat resistant? Also the abundancy of that metal must be high, meaning that there's alot!

2007-03-04 22:54:44 · 3 answers · asked by leehoyle2000 1

So what happens when a fly hits a bus going in the opposite direction?

2007-03-04 22:53:39 · 10 answers · asked by Anonymous

The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you loft the ball with an initial speed of 15.0 m/s at an angle of 50.0° the horizontal. At this instant your opponent is 10.0 m away from the ball. He begins moving away from you 0.30 s later, hoping to reach the ball and hit it back at the moment that it is 2.10 m above its launch point. With what minimum average speed must he move? (Ignore the fact that he can stretch, so that his racket can reach the ball before he does.) http://edugen.wiley.com/edugen/courses/crs1507/art/qb/qu/c03/ch03p_40.gif

2007-03-04 22:41:22 · 2 answers · asked by Anonymous