Physics - March 2007

2007-03-23 11:16:58 · 2 answers · asked by ... 3

2007-03-23 11:08:58 · 9 answers · asked by colin050659 6

2007-03-23 10:52:49 · 4 answers · asked by sajgirl88 1

can you see it?

2007-03-23 10:52:10 · 3 answers · asked by ixat02 2

proton ?
neutron ?
electron?

2007-03-23 10:50:40 · 7 answers · asked by couturevogue 3

2007-03-23 10:42:41 · 1 answers · asked by Appel 2

problem: A flashlight lamp connected to a battery that provides 1.4 V draws a current of 0.10 A. what electric power is used by the lamp??

i need solution for this one.help me please

2007-03-23 10:39:04 · 6 answers · asked by bambini 1

question: a refrigerator is equipped with a motor that draws 100 w but operates only 25% of the time. What is the cost of operating the refrigerator for 30 days if electricity costs $0.080/kwh?

help me plzzzzzzzzzzzz

2007-03-23 10:36:28 · 2 answers · asked by bambini 1

Two horizontal metal plates, each 100 mm square, are aligned 10.0 mm apart, with one above the other. They are given equal-magnitude charges of opposite sign so that a uniform downward electric field of 2500 N/C exists in the region between them. A particle of mass 2.50 10-16 kg and with a positive charge of 1.20 10-6 C leaves the center of the bottom negative plate with an initial speed of 1.00 105 m/s at an angle of 37.0° above the horizontal. Where does the particle strike relative to a starting point?

2007-03-23 10:33:36 · 1 answers · asked by Victoroza 1

decreases friction between the tires of a car and the road ?
increases friction between the tires of a car and the road ?
decreases the gravitational force on a car ?
increases the normal force of a car on the road?

2007-03-23 10:27:57 · 6 answers · asked by couturevogue 3

is the strong nuclear force held together by muons and pions?
i read it in a book but wasnt quite sure...

2007-03-23 10:19:09 · 5 answers · asked by provi43 2

A three-cell flashlight draws a current of 0.60 A. What is the operating resistance of the light bulb if each cell provides a potential of 1.0 V when delivering this current?

i need your help.. so, please help me with this.. thank you

2007-03-23 10:15:53 · 2 answers · asked by shiriguro 1

A compond disk consists of the main disk D and three being disks A,B and C , with their axis parallel to the axis of D and all three being welded to D as shown bellow in the link. The thickness of all four disks is the same, t(a)=t(b)=t(c)=t(d). The radius of the disks A and B are the same , r(a)=r(b)=r(d)/6 . The radius of the disk C is larger , r(c)=r(d)/3. Similarly the mass densities of the disks differ from the main disk. ρ(a)=ρ(b)=2ρ(d). For the disk C , ρ(c)=1.60 ρ(d). Using the parallel-axis theorem, obtain the moment of inertia I of the compound disk about the vertical axis Z which is normal to D and goes through its center. The distance between the centers of disks A,B, and C from the center of the disk D is the same , h(a)=h(b)=h(c).

Data: ρ(d)=3100kg/m^3 , h(a)= 0.810 r(d) , r(d)= 0.620m, t(a)=0.124m.

http://new.photos.yahoo.com/cuteboy8184/photo/294928804292603232/1

2007-03-23 10:13:28 · 1 answers · asked by cute b 1

A genius was walking along a railroad track when she came upon a narrow railroad bride.
The bridge was only wide enough to allow the train to pass.
When she was 3/8 of the way across, she heard a train whistle. Being a genius, she instantly realized that if she ran back to the beginning of the bridge at her speed, she would be able to get out of the way just in time to avoid being hit by the train and if she were to continue at her speed to the end of the bridge, she would just have time to get off the bridge before being hit by the train.
If she runs at 10.5mph, how fast is the train going?

2007-03-23 10:13:01 · 2 answers · asked by jessica 1

here's the problem: A proton of charge q = 1.60 x 10e-19 C is placed in a region of uniform electric field with field strength E= 1.46 x 10e5 N/C/. What is the electric force on the proton?

help me, please

2007-03-23 10:00:34 · 1 answers · asked by shiriguro 1

2007-03-23 09:57:15 · 4 answers · asked by Tonia S 1

this is for a sience fair project that i am doing

2007-03-23 09:52:14 · 2 answers · asked by Matthew e 1

Seriously though...
I remember hearing an explanation years ago that sounded theoretically possible, which I know time travel is, but I've forgotten.
It was something to do with travelling into space at faster than the speed of light, and then returning before something happened - or something...
There's got to be some trekkies out there who can help!

2007-03-23 09:44:05 · 11 answers · asked by Dogsbody 5

so whenever i come to use my camera th batteries are flat!

2007-03-23 09:23:06 · 3 answers · asked by Zen禅Maiden :ジェダイ 3

question: calculate the electric resistance of an iron rod 2.00 m long, assuming that its cross-sectional area is 0.90 square millimeter...


i really dont have an idea on how to solve this.. i badly need your help, so, please help me...

2007-03-23 09:18:27 · 2 answers · asked by mulan 1

question:

1.) A point charge q produces an electric field of magnitude 90.5 N/C at a distance of 1.68 m. if the field is directed toward the charge, what is the value of q?

help me, please???.............

2007-03-23 09:11:16 · 3 answers · asked by mulan 1

please, help me with this! i beg you!

question: calculate the resistance of a piece of 20-gauge copper wire 2.00 m long. The cross-sectional area of 20-gauge wire is 0.5176 square millimeter.

thanx. please help me solve this...........

2007-03-23 08:56:07 · 3 answers · asked by Anonymous

i need a solution for this problem! so, please help me!

question: What is the cuurent drawn by a 470-ohms resistor when a potential difference of 25.0 V is maintained across it?

help me! please!...

2007-03-23 08:52:57 · 2 answers · asked by Anonymous

2007-03-23 08:48:05 · 6 answers · asked by Alisa A 1

help me please!

question: two resistors are connected in series across an ideal 12.0-V battery. Resistor A has a value of 24.0-ohms and the potential difference across resistor B is 3.60 V. (a) What is the potential difference across A? (b) What is the current in the resistors? (c) What is the resistance of B? (d) What is the total power dissipated in the circuit?

please help me solve this! i really dont have an idea! thanx.

2007-03-23 08:44:57 · 3 answers · asked by Anonymous

Will burns a 0.3 g nut beneath 52 g of water, which increases in temperature from 22°C to 50°C. (a) Assuming 40% efficiency, what is the food value in calories of the nut? (in calories)

2007-03-23 08:43:16 · 2 answers · asked by Dirck G 1

please help me! plz, plz, plz...

question: 1.) capacitors of 10, 20, and 50 uF are joined together in series. What is their equivalent capacitance?

2.) Three capacitors of 1.0, 1.5, and 5.0 uF are joined together in series. What is their equivalent capacitance?

3.) Three capacitors of 2.0, 5.0m and 20 uF are joined together in parallel. What is their equivalent capacitance?

pleas help me answer this three problems. i need solutions for these. help me please. thanx.

2007-03-23 08:38:36 · 3 answers · asked by Anonymous

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 11°C?

2007-03-23 08:36:31 · 1 answers · asked by Darren R 1

Radioactive decay of granite and other rocks in the Earth's interior provides enough energy to keep the interior molten, heat lava, and provide warmth to natural hot springs. This is due to the average release of about 0.03 J per kilogram each year. How many years are required for a chunk of thermally insulated granite to increase 490°C in temperature (assume the specific heat of granite is 800 J/kg °C)?

2007-03-23 08:35:50 · 2 answers · asked by Darren R 1

In a 25°C room, hot coffee in a vacuum flask cools from 72°C to 48°C in eight hours. What will its temperature be after another eight hours?

2007-03-23 08:34:55 · 5 answers · asked by Darren R 1