Physics - July 2007

any help is welcome!

2007-07-10 13:27:08 · 8 answers · asked by PW_AD_TH 1

2007-07-10 13:21:02 · 1 answers · asked by Anonymous

1. A uniform board is suspended from the ceiling and horizontally by two wires, A and B. The board is 2m long and has a mass of 25kg. What is the tension in each of the two wires when a sign of 35kg is hung on the board a distance of 0.5m from one end?

see picture
http://i23.photobucket.com/albums/b354/Sunshinegirl93534/untitled-4.jpg

2007-07-10 13:01:43 · 2 answers · asked by sunshinegirl93534 2

Time Travel.

2007-07-10 12:02:40 · 11 answers · asked by ron_datu1984 1

2007-07-10 11:35:38 · 7 answers · asked by isis 4

OK, so a permanent magnet creates a force caused by the subatomic and quantum effects of the electromagnetic 'wavicles' in it, this much I get. BUT, if I fix my magnet under a shelf and put something magnetic or ferrous under it, it will at some point lift the item by attraction.
I also get that, once the item is held in place, there is no more use of energy, as if the item was on top of the shelf, but there has been an increase in the potential energy of the item as it was lifted.
SO, where did that energy come from? If it comes 'from' the magnetic field, what 'lost' energy to balance the increase as the field remains constant and, if I continue to remove items and get them lifted again, (notionally forever) what would the eventual result be. Something should be getting cold or something for this to happen.

2007-07-10 11:29:53 · 4 answers · asked by Doom 2

If I were to pee off the top of a 1000 foot building (100 stories) how long would it take before the first droplets hit the ground?

2007-07-10 11:20:03 · 2 answers · asked by John Harrington 2

What would be the subsequent motion of a cannon if it has been facing the wrong way and the ball fired had been absorbed by some cargo lying about a deck?

Normally, the ball fired with the cannon facing the right way, would make the cannon move in the opposite direction of the ball.

Please advise, thanks.

2007-07-10 11:09:44 · 3 answers · asked by Anonymous

The stevedore is loading 100-pound drums on a truck by rolling them up a ramp. The truck bed is 3 feet above the street and the ramp is 6 feet long. How much force must the stevedore exert on the drums as she goes up the ramp?

a) 200 lb
b) 100 lb
c) 50 lb
d) 10 lb
e) Can't say

2007-07-10 11:09:19 · 5 answers · asked by ? 6

a pilot attempts to fly a plane to an aiport 180 km E 20 N of its initial position. a wind blowing at 90 km/h acts on the plane E 40 N if the plane lands 0.4 h after take off find its airspeed heading

any help please?
im stuck with this on

2007-07-10 10:48:19 · 3 answers · asked by sweetheart 2

Is there some electrical phenomenon corresponding to black holes? "charge holes?"

2007-07-10 10:20:17 · 2 answers · asked by jason s 2

A person is standing outdoors in the shade where the temperature is 26 °C

2007-07-10 10:18:41 · 2 answers · asked by DisountShoes 1

Give specific example

2007-07-10 10:17:20 · 3 answers · asked by Alexander 6

An object is solid throughout. When the object is completely submerged in ethyl alcohol, its apparent weight is 15.1 N. When completely submerged in water, its apparent weight is 12.7 N. What is the volume of the object?

2007-07-10 10:14:47 · 3 answers · asked by Eunice C 1

A 747 goes over 600mph, i'm pretty sure you wouldn't fall that quickly, but the route would be more direct.

2007-07-10 10:14:26 · 5 answers · asked by Wayne C 1

2007-07-10 10:07:37 · 6 answers · asked by Alexander 6

2007-07-10 10:01:11 · 2 answers · asked by Cuondodrside 1

Just wondered what the people with the science degrees think about this one, since the media can so easily influence popular opinion.

2007-07-10 09:48:50 · 4 answers · asked by John S2005 3

an infinite set of silver bells of identical geometric
proportions. The bell with the lowest pitch is tuned to
pitch A, the next bell is tuned to A-sharp, then B,
C, C-sharp an so on to cover entire chromatic scale
of notes. Poor fella has only 1lb of silver.

How much siver should the jeveler use
for the largest bell in the set?

2007-07-10 08:59:36 · 2 answers · asked by Alexander 6

1) You push a block up a ramp with friction. The block is moving at constant speed.
-The force you push with is greater than the force of kinetic friction.
-The force you push with is less than the force of kinetic friction.
-The force you push with is equal to the force of kinetic friction.
-Kinetic friction is not the important friction in this case, static friction is.
2) As you ride on a loop to loop in a roller coaster, select all the forces that might be acting on you at the top of the loop
(select ALL that are correct)
force down due to gravity
force down from the seat on you
force up on you from the straps holding you in place
centripetal force on you that is down

2007-07-10 08:45:02 · 2 answers · asked by Anonymous

You place a needle into the end of a SHARP pencil eraser and insert a string into the needle and place it over your wrist. Hold it still and it should either go in circles or back and forth. If the pencil goes in circles you will have a girl if it goes back and forth it's a boy. How does this work?

2007-07-10 08:41:32 · 4 answers · asked by Anonymous

A projectile's launch speed is five times its speed at maximum height. Find launch angle.
How to get the answer of 78.5 degrees?

Thanks

2007-07-10 08:29:32 · 2 answers · asked by Allan C 1

2007-07-10 08:28:16 · 18 answers · asked by YIZZEL/JON 1

2007-07-10 08:23:24 · 3 answers · asked by farooq 1

2007-07-10 07:51:57 · 23 answers · asked by jason s 2

And you jumped in it feet first would you come out the other end feet first? if not where would you turn round and how? If you did come out feet first you would be upside down to the other people.

2007-07-10 06:55:08 · 7 answers · asked by Anonymous

please dont say acceleration(former) & velocity(latter)

2007-07-10 06:23:02 · 12 answers · asked by Anonymous

What date would you pick also if you could only take one person with you who would it be?

2007-07-10 05:05:35 · 13 answers · asked by Wide Awake 7

That interact with the radiation the same way the a mirror would with regular visible light?

2007-07-10 03:45:54 · 5 answers · asked by Anonymous

2007-07-10 02:42:31 · 5 answers · asked by kristine mae 1