Physics - August 2007

You can add gas also to the list, if at all it can be compared in understandable terms

2007-08-04 15:13:40 · 0 answers · asked by coolguy_ind74 2

visible or invisible?

Is it possible this is happening around us now?

Is it possible to create something that reflects light in this spectrum?

2007-08-04 12:13:40 · 6 answers · asked by Sean 7

what can cause it and how long canit last

2007-08-04 10:39:07 · 1 answers · asked by Dana F 1

Why, at room temp & pressure, is the dense metal mercury a liquid? It sort of goes against the grain. Are there any other elements liquid at room temp & pressure?

2007-08-04 09:42:03 · 10 answers · asked by Michael K 1

What happens if a car is dropped from 625 feet and it hits water or solid ground? what would it be simular to?

2007-08-04 09:34:32 · 11 answers · asked by wallingfordjoe2 1

Electricity is such energy that available anytime with many durable sources. But the devices that use it must be connected to Electricity Supplier anytime.
I mean, if the energy can be stored in powerful battery, it will solve the oil problems such as in automotive. Is there any concern to make the battery be more powerful as a priority to scientists?

2007-08-04 07:59:35 · 9 answers · asked by agulinovich 3

A cyclist uses 27,000 joules per minute (this is about 385 food Calories per hour) to cycle at a constant pedaling rate of 450 radians per minute along a flat road using a gear ratio of 4. Find the torque exerted on the rear gear wheel. ?

2007-08-04 07:32:51 · 2 answers · asked by Anonymous

2007-08-04 06:55:44 · 2 answers · asked by Lord Ultimate 1

2007-08-04 06:41:48 · 6 answers · asked by nitish 1

anti protons anti neutrons and anti electrons
quarks tachyons..? can someone explain
Is Dr Stephen Hawking out there ?

2007-08-04 05:51:34 · 5 answers · asked by goodcharacter 3

(In a hydralic system)
If a weight of 1500 N (Fout) must be lifted, how much force (Fin) must be applied to the input end ?
Area in= 3m^2
Area out= 60m^2

2007-08-04 05:23:43 · 5 answers · asked by ted 1

2007-08-04 05:21:37 · 4 answers · asked by (: Muffin Man :) 2

A hot air balloon, with a mass of 15 kg., hoovers at an altitude of 7 km. where the weight density of the air is 2.6 N/m3. If a suitcase is dropped from the balloon, the balloon rises to an altitude where the weight density of the air is 2.1 N/m3. What is the weight of the suitcase ? show work

2007-08-04 05:19:32 · 1 answers · asked by ted 1

when we punch throttle to a car(rear wheel)/bike in mid air why does it happen that the vehicle tends to move downwards from its back?..i mean why does it appear that the back part of the vehicle has become heavier?

2007-08-04 05:13:06 · 3 answers · asked by Anonymous

If theres one idea we can take home from what weve learned from it, what is it?

2007-08-04 05:12:57 · 6 answers · asked by Anonymous

The standard model of a black hole is almost like a concaved plane making up the event horizon, with a singularity at the tip. But wouldn't gravity be pulling equally from all directions around the singularity? That is, to say, wouldnt it make more sense for a black hole to not have a single event horizon, but rather a spherical field of gravitational pull?

2007-08-04 04:45:06 · 4 answers · asked by Anonymous

if there was a box which weighed about1 kg and inside was a weight about 25kgs, but it was floating in the box (pretend), Would it increase the weight of the box?

2007-08-04 03:30:33 · 26 answers · asked by sbalroarhe 2

2007-08-04 02:37:51 · 6 answers · asked by Anonymous

the radius of the earth's orbit around the sun(assumed to be circular) is 1.50 x 10 power of 8km, and the earth travels around this orbit in 365 days.

a)what is the magnitude of the orbital velocity of the earth, in m/s?

b)what is the radial acceleration of the earth toward the sun, in m/spower of 2?

c)repeats part (a) and (b) for the motion of the planet Mercury (orbit radius = 5.79 x 10 power of 7km, orbital period = 88 days?

2007-08-04 02:05:51 · 2 answers · asked by DiMaHaZiaF 1

2007-08-04 00:14:00 · 9 answers · asked by wamBEE beLda 1

2007-08-03 23:18:56 · 6 answers · asked by Anonymous

2007-08-03 21:34:54 · 4 answers · asked by Anonymous

2007-08-03 20:43:35 · 12 answers · asked by bhaskar_bvbcet 1

1 A man walks 1.41km directly northeast. What is the component of his displacement in a north direction?
4. Boat is crossing a river. The boat's water carries the boat downstream at a rate such that the resultant velocity of the boat is 6.5m/s. What is the velocity of the water in the river?
5.A man is plowing snow from his driveway. He pushed down teh handle of the plow with a force of 48N with the handle forming an angle of 60 degrees with the horizontal driveway. What is the useful (horizontal) component of the force he exerts down the handle?

4. An aircraft is traveling southwest with a speed of 1410km/h. What is the west compoonent of this velocity?
6. Two dogs are pulling on the same bone. A podle is pulling toward the south with a force of 7N. A spaniel is pulling toward teh east with a force of 24N. With what force and in what directioon must a collie pull on the same bone, if the bone is to have a net force of zero on it? (degrees relative t north)

2007-08-03 19:06:13 · 2 answers · asked by Anonymous

ASSUME THE TWO PLAYERS WERE INITIALLY RUNNING DIRECTLY AT ONE ANOTHER. NEGLECTING THE LEGALITY OF THE PLAY AND THE EFFECTS DUE TO DIGGING IN OF CLEATS:
a) NEITHER PLAYER WILL DRIVE THE OTHER BACKWARD.
b) THIS IS A SIMPL EXAMPLE OF AN ELASTIC COLLISION
c) THE LINEBACKER WILL DRIVE THE HALFBACK BACKWARD.

2007-08-03 18:54:29 · 2 answers · asked by Josh Muller 1

I'm currently a graduate student in philosophy, and have maintained a non-physicist's interest in questions concerning the "nature" of spacetime.

My question is:
Using the analogue of a three-dimensional spacetime, would is be possible, from a conceptual and physical standpoint, to represent objects on a two-dimensional spatial manifold, and represent time as a third spatial dimension, albeit one not spatially accessible to entities living on a two-dimensional manifold? What I am driving at is whether it is possible to reduce the physical concept of time to description in terms of higher-dimensional spatial coordinates; in our case, time would thus be defined as a fourth spatial dimension. In the example above, it would represent a third spatial dimension for two-dimensional entities.
Is there anything in extant physical theory to support or rule out this possibility? thanks!

2007-08-03 18:38:18 · 9 answers · asked by logos 1

2007-08-03 16:31:07 · 8 answers · asked by bela13 1

1. a 3.52 kg lead can inside a calorimeter contains 2.25 kg of water at 37.5 degree celsius.What mass of silver at 108.6 degree celsius added to the calorimeter would result in a final temperature of 45 degree celsius.
(C of water- 4186 J/kg-Cdegree, C of lead- 128 J/kg-Cdegree, C of siver 235 J/kg-Cdegree)

2.A combination of 0.250 kg of water at 20 degree celsius, a 0.400 kg of aluminum at 26 degree celsius and 0.100 kg of copper at 100 degree celsius is mixed in an insulated container and allowed to come to thermal euilibrium.Ignore any energy transfer to or from the container and determine the final temperature of the mixture.( C of water-4186 J/kg-Cdegree, Caluminum -910 J/kg-Cdegree, C of copper- 390 J/kg-Cdegree)

2007-08-03 16:02:49 · 2 answers · asked by ice_cream_chico 1

''in a static situation, the electric field at the surface of a conductor can have no component parallel to the surface because this would violate the condition that the charges on the surface are at rest. '' would this same statement be valid for the electric field at the surface of an insulator?explain why answer and the reason for any differences between the cases of a conductor and an insulator.

2007-08-03 15:53:26 · 2 answers · asked by DiMaHaZiaF 1

a solid conductor has a cavity in its interior. would the presence of a point charge inside the cavity affect the electric field outside the conductor? why or why not?would the presence of a point charge outside the conductor affect the electric field inside the cavity? again, why or why not?

2007-08-03 15:47:27 · 2 answers · asked by DiMaHaZiaF 1