Physics - October 2007

2007-10-24 01:58:46 · 7 answers · asked by TAGQuestion 1

2007-10-24 01:40:26 · 7 answers · asked by anjith g 1

2007-10-24 01:08:19 · 4 answers · asked by Anonymous

You accidentally throw your car keys horizontally at 7.0 m/s from a cliff 72 m high. How far from the base of the cliff should you look for the keys?

2007-10-24 01:00:10 · 4 answers · asked by Anonymous

2007-10-24 00:56:24 · 2 answers · asked by wolfestone 1

you cannot SEE the beams during the day-light hours?

2007-10-23 23:40:35 · 7 answers · asked by nookie181 5

The Peltier effect is the reverse of the Seebeck effect; a creation of a heat difference (between two joint) from an electric voltage.

This temperature difference gives rise to a seebeck voltage which is opposite the voltage of the battery. So we can resonably conclude that it can contribute to the loss of voltage of the battery, can't we?

2007-10-23 23:37:08 · 1 answers · asked by Anonymous

I think I heard that scientists have 'teleported' particles and that there's an outside chance that one day teleportation of larger objects and even living organisms may be possible. My question relates to whether we can guarantee that the process actually transfers the complete information of an organism without destroying it. Imagine a scenario with two 'pods' - one transmitting and one receiving - what if the person 'arriving' at the receiving pod was actually only a facsimile of the one who entered the transmitting pod, with memories intact up to the point of getting into the pod. This facsimile would believe they were the person that entered the transmitting pod, wheras they are actually a perfect copy, and the original person has been destroyed in the process. To anyone observing the process, it would appear as though the transfer had been successful. Doubt this will happen in my lifetime (if ever), but how could you prove that the process is not killing the users?

2007-10-23 23:07:05 · 20 answers · asked by Anonymous

2007-10-23 21:02:13 · 5 answers · asked by triplel R 1

A magnetic field has a magnitude of 1.20E-3 T, and an electric field has a magnitude of 4.70E3 N/C. Both fields point in the same direction. A positive 1.8 µC charge moves at a speed of 3.40E6 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge.

2007-10-23 20:48:38 · 1 answers · asked by Josh M 1

In a television set, electrons are accelerated from rest through a potential difference of 25 kV. The electrons then pass through a 0.30 T magnetic field that deflects them to the appropriate spot on the screen. Find the magnitude of the maximum magnetic force that an electron can experience.

2007-10-23 20:42:09 · 1 answers · asked by Josh M 1

When the 2 life preservers are fully submerged, the one filled with lead sinks & the styrofoam one rises to the top because:
a)the buoyant force is greater on the styrofoam
b)the weight of the lead is greater than the buoyant force
c)the weight of the styrofoam is less than the buoyant force
d)the density of the lead is less than that of water
e)2 of the above

Wouldn't the answer to this be b & c or e)2 of the above?

2007-10-23 20:35:29 · 1 answers · asked by AnonymousOne 2

2007-10-23 20:32:08 · 2 answers · asked by triplel R 1

How is this possible scientifically speaking?

2007-10-23 20:19:11 · 5 answers · asked by Puppy Zwolle 7

Einstein says that accelerating an object will increase it mass expotentially.What happens if you accelerate a singularity?

2007-10-23 19:32:13 · 4 answers · asked by Anonymous

Calculate the force of a 10 kg object that is pushed 44 m by 3 people for 17 minutes, when the object finally touches you its is traveling 3 m/s2. ( Note: it is pushed by 3 people )

2007-10-23 19:28:55 · 3 answers · asked by rockerkid100 2

which has the higher frequency--

dim purple light [wavelength=400 nm]
OR
bright red light [wavelength=700 nm]

&
can you tell me how you know?

2007-10-23 19:22:48 · 1 answers · asked by Anonymous

A 725 g metal wire is bent into the shape of a hoop 58.0 cm in diameter. Six wire spokes, each of mass 113 g, are added from the center of the hoop to the rim. What is the moment of inertia of this object about an axis perpendicular to it through its center?

2007-10-23 18:19:45 · 4 answers · asked by KT 1

A car traveling along a level road at speed 'v' slams on the brakes and skids to a stop. If the force of friction on the car is half the car's weight, how far does the car slide? (Hint: Use the work-energy theorem and solve for 'd')

2007-10-23 18:08:16 · 2 answers · asked by jalisamarie12 1

An iceboat is at rest on a frictionless frozen lake when a sudden wind exerts a constant force of 212 N, toward east, on the boat. Due to the angle of the sail, the wind causes the boat to slide in a straight line for a distance of 7.0 m in a direction 20° north of east.
(a) What is the kinetic energy of the iceboat at the end of that 7.0 m?
kJ
(b) The boat has a mass of 300 kg. What is the speed of the boat?
m/s

2007-10-23 17:41:22 · 1 answers · asked by Anonymous

What is the angle of projection?

2007-10-23 17:14:36 · 2 answers · asked by novusordo005 1

If v = t^2 + 4m/s what is the acceleration at times (acceleration not constant):
t=1s and t=4s

I've worked out that V=5 at 1s and V=20 at 4s using the initial formula...

And then supposedly meant to use this formula to find accelleration => a=dv/dt...

But if you know an easier way that would be even better

Thanks guys

2007-10-23 16:20:01 · 2 answers · asked by Anonymous

Answer in scientific notation

2007-10-23 15:15:51 · 3 answers · asked by James H 1

an inclined plane is 10 meters high. An effort of 200 newtons is required to pull an 800 newton cart up the inclineplane.

2007-10-23 15:07:39 · 1 answers · asked by Anonymous

A ly (light year) is the distance that light travels in one year. The speed of light is 3.00E8 m/s. How many meters are there in 15.52 ly?

2007-10-23 14:52:00 · 4 answers · asked by kickitup21 1

How does a well-knotted shoelace come untied on its own? Seems like everyday I'm retying my shoes.

2007-10-23 14:51:04 · 8 answers · asked by whitesox09 7

2007-10-23 14:42:00 · 2 answers · asked by Jaime G 1

I have trouble perceiving torques. We can feel the linear force because when someone pushes us we tend to fall into that direction and then we yell at that person :). However I wanted to know if I were to feel a torque how would that compare? So far my perception of a torque is just numbers and symbols.

2007-10-23 14:40:59 · 3 answers · asked by Anonymous

Also, since sound waves are the most common longitudinal waves, how can I know whether or not it IS a sound wave?

2007-10-23 14:30:45 · 1 answers · asked by Anonymous

Note: Coal and oil are non-renewable re-
sources.
A friend says the energy of oil and coal is actually a form of solar energy. Is your friend correct, or mistaken?
1. Mistaken; the energy is actually nuclear.
2. Mistaken; the energy is actually geothermal.
3. Correct; these materials are the result of photosynthesis, a physical-chemical process that incorporates the sun's radiant energy into plant tissue

2007-10-23 14:25:56 · 2 answers · asked by Captain Jack is Back 1