Physics - March 2007

Will burns a 0.8 g nut beneath 50 g of water, which increases in temperature from 22°C to 50°C.

2007-03-23 08:34:03 · 1 answers · asked by Darren R 1

A container of hot water at 80°C cools to 79°C in 15 seconds when it is placed in a room that is at 20°C. Use Newton's law of cooling to estimate the time it will take for the container to cool from 60°C to 59°C.

2007-03-23 08:33:06 · 1 answers · asked by Darren R 1

i have to get this right! so, please d help me!

question: a radio capacitor is made of metal plates, each with an area of 6.0 square cm. The plates are arranged to make 15 parallel-plate capacitors wired in a parallel configuration. (a) What is the capacitance if the plates are rotated so that the effective area of overlap is 4.0 square cm.

please help me solve this! i really dont have an idea on how to solve this! so, please help me! thanx.

2007-03-23 08:21:52 · 1 answers · asked by cyrille melgo 1

According to Quantum Theory, all of space is potentially filled with virtual particles. String theory proscribes that particles are actually modes of vibration of strings. So are there virtual strings?

2007-03-23 08:13:22 · 3 answers · asked by Gargoil 2

i have to get this right! so, please help me with this ok? thanx.

question: The light-duty extension cords that are routinely sold use are made from 18-gauge copper wire. Cords for higher current usage are often made from 16-gauge wire. Compute the resistances of wires 5.00 m long. The cross-sectional area of 18-gauge wire is 0.8231 millimeter square(mm2), and that of 16-gauge wire is 1.309 millimeter square.

2007-03-23 08:12:58 · 2 answers · asked by cyrille melgo 1

Its also says to describe how your method would move you to the edge.

2007-03-23 08:12:17 · 7 answers · asked by werewulf2000 2

Suppose the 1.3 km main span of steel for the Golden Gate Bridge had no expansion joints. How much longer would it be for an increase in temperature of 17°C?

2007-03-23 08:10:52 · 1 answers · asked by Dirck G 1

It's Sarah's question of the day!

2007-03-23 08:10:31 · 4 answers · asked by Anonymous

i have to get this right! please do help me! plz, plz, plz....

question: a charge corresponding to one electron for every person in the united states passes a point in 10.0 ms. What is the resulting current? (take the population to be 260 million people. The charge on an electron is 1.60 x 10e-19 C).

thanx!

2007-03-23 08:03:56 · 2 answers · asked by cyrille melgo 1

2007-03-23 08:03:20 · 3 answers · asked by KB 1

please help with this! it's urgent!

question: calculate the magnitude of the repulsive force between a pair of like charges, each one of micro coulomb, separated by a distance of one centimeter.

2007-03-23 07:41:17 · 2 answers · asked by cyrille melgo 1

An airplane propeller is 2.08 m in length (from tip to tip) and has a mass of 117 kg. When the airplane's engine is first started, it applies a constant torque of 1950 N*m to the propeller, which starts from rest.

Part A: What is the angular acceleration of the propeller? Treat the propeller as a slender rod (I =(1/3)ML^2).

Part B: What is the propeller's angular speed after making 5.00 rev?

Part C: How much work is done by the engine during the first 5.00 rev?

Part D: What is the average power output of the engine during the first 5.00 rev?

Part E: What is the instantaneous power output of the motor at the instant that the propeller has turned through 5.00 rev?

2007-03-23 07:34:01 · 1 answers · asked by Superman 1

The speed of a falling object increases by 9.8 m/s each second. The relationship between the fallen and time of a falling object is:

a) Linear
b) Quadratic
c) Exponential
d) Logarithmic

2007-03-23 07:20:59 · 4 answers · asked by Couture G 1

2007-03-23 07:10:31 · 6 answers · asked by Anonymous

2007-03-23 06:59:15 · 7 answers · asked by Anonymous

2007-03-23 06:52:27 · 4 answers · asked by fritz020202 1

i need to kno 4 chem

2007-03-23 06:45:16 · 13 answers · asked by Anonymous

It really fasinates me that an atom can never be destroyed. yes, they can be cut in half more and more, but in teh end they are just a smaller piece, they arent gone. There is no way we can make an atom out of nothing or destroy an atom. so that means the same atoms that were here in pre-historic times, are with us right now! they might be in out food, at our school, in our books, everywere! What are your thoughts and opinions on this? itrs really interesting to me!

2007-03-23 06:41:26 · 5 answers · asked by Anonymous

2007-03-23 06:22:46 · 6 answers · asked by silverback7m 2

i mean,if sin i/sin r = infinity,then sin r =0 i.e r=0...so when does this happen??

2007-03-23 06:06:49 · 5 answers · asked by early_blossom 2

When I get out of the car each time, and go to shut the door, I get a shock from static build up, why?
I am not wearing artificial fibres in my clothing, use fabric conditioner and hubby never gets it, why me?
I upset the dog too, cos I gave her a shock when I went to put her lead on to get her out of the car!
I also get them off trolleys in the supermarket and recently shocked a child as it brushed by me, made it cry! oopps! But why?

2007-03-23 06:04:31 · 9 answers · asked by SunnyDays 5

gravity,potential energy,inertia,friction, kinetic ,kinetic energy,centripetal force,centrifugal force,force of impact,momentum.Please help me this is really important to me!Thank you.

2007-03-23 05:26:48 · 4 answers · asked by Anonymous

I read our eyes can only see visible light. Color is dictated by which frequency of visible light our eyes are picking up. I also read that objects absorb certain frequencies and are made to emit a specific frequency, the one that gives that respective object's color. Like a red rose for example. It's inherit make-up allows it to emit "red."

I also notice that when there is a absence of light, even the whitest walls in a dark room are black. So, can it be said, that in reality, everything is naturally colorless or black? That when we close our eyes the world around us is just absent of color. Only our eyes make color. You know what I mean?

2007-03-23 05:26:16 · 7 answers · asked by Anonymous

gravity,potential energy,inertia,friction,kinetic,kinetic energy,centripetal force,centrifugal force,force of impact,momentum.Please help me this is really important to me!Thank you.

2007-03-23 05:25:08 · 7 answers · asked by Anonymous

A wire is made of a material with a resistivity
of 5.1043x10^-8 ­ ohms x m. It has length 6.09562m
and diameter 0.24907 mm.
What is the resistance of the wire? Answer
in units of ­ohms

2007-03-23 05:16:32 · 1 answers · asked by john s 1

1- Why do you change the unit of time constant from sec tp min in charging the capacitor expirament?

2- Explain: when we connect on series electrical lamb with capacitor and DC current we fined the lambis lightening for few time then it stops, but when we connect it with AC current the lamb id lightening very well and for a long time?

2007-03-23 05:15:31 · 2 answers · asked by Grace 2

A wire with a resistance R is lengthened to
2.91 times its original length by pulling it
through a small hole.
Find the resistance of the wire after it is
stretched. Answer in units of R.

2007-03-23 05:14:12 · 4 answers · asked by kpm0729 1

A capacitor is constructed from two square
metal plates. A dielectric k = 2.05 fils the
upper half of the capacitor and a dielectric
k = 6.6 fills the lower half of the capacitor.
Neglect edge effects.
Calculate the capacitance C of the device.
Answer in units of pF

2007-03-23 05:12:39 · 2 answers · asked by kpm0729 1

2007-03-23 05:10:59 · 5 answers · asked by Crystal D 1

When a certain air-fillled parallel-plate ca-
pacitor is connected across a battery, it ac-
quires a charge (on each plate) of magnitude
95 microC. While the battery connection is main-
tained, a dielectric slab is inserted into the
space between the capacitor plates and com-
pletely fills this region. This results in the ac-
cumulation of an additional charge of 328 microC
on each plate.
What is the dielectric constant of the slab?

2007-03-23 05:10:30 · 1 answers · asked by kpm0729 1