Physics - March 2007

2007-03-02 14:22:18 · 6 answers · asked by Anonymous

i know bigger wheels are better for distance (which is what i'm aiming for). is it better to have bigger wheels for the rear wheels, and a different (smaller) size in the front? what is the reason for this?

and. any ideas on what to use for the back wheels that are bigger than cds, but smaller than records?

also. are there any sites with some design ideas? i have tested it with just a rubber band connecting the axles, and it works fairy well. but it seems too simple and unoriginal.

2007-03-02 13:58:00 · 3 answers · asked by Anonymous

I don't understand this question.
Please help me.

2007-03-02 13:21:55 · 1 answers · asked by vicky p 1

A toy rocket-launcher contains a spring with a spring constant of 35 N/m. How far must the spring be compressed to store 1.5 Joules of energy.

I don't understand this question.
Please help me.

2007-03-02 13:20:52 · 3 answers · asked by vicky p 1

A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 3.96 x 105 N. In being launched from rest it moves through a distance of 85.0 m and has a kinetic energy of 7.68 x 107 J at lift-off. What is the work done on the jet by the catapult?

2007-03-02 13:14:29 · 2 answers · asked by Mariam T 1

A kayaker paddles with a power output of 50W to maintain a steady speed of 1.50m/s. (a)Calculate the resistive force exerted by the water on the kayak. (b) If the kayaker doubles her power output, and the resistive force due to the water remains the same, by what factor does the kayaker's speed change.

2007-03-02 12:49:16 · 1 answers · asked by christy r 1

A point source of light is submerged 3.0 m below the surface of a lake and emits rays in all directions. On the surface of the lake, directly above the source, the area illuminated is a circle. What is the maximum radius that this circle could have?

2007-03-02 12:47:14 · 2 answers · asked by christian m 2

Today's, saturday, lunar eclipse

2007-03-02 12:34:58 · 3 answers · asked by Anonymous

2007-03-02 12:31:52 · 1 answers · asked by juan 2

2007-03-02 12:17:17 · 4 answers · asked by Anonymous

Sue and Jenny kick a soccer ball at exactly
the same time. Sue's foot exerts a force of
41.7 N to the north. Jenny's foot exerts a
force of 116.3 N to the east.

a) What is the magnitude of the resultant
force on the ball? Answer in units of N.

b.)What is the direction of the resultant force
(measured from East)? Answer in units of in degrees

2007-03-02 12:06:00 · 4 answers · asked by i.p 1

2007-03-02 12:04:37 · 6 answers · asked by Anonymous

why does mass increase when it reaches speeds near that of c?

and if you just want to ramble some cool scientific stuff I'll listen, doesnt even have to be about mass or light just make it interesting :)

2007-03-02 11:52:06 · 6 answers · asked by StoneWallKid 2

Some people say it's average velocity while others say it's change in velocity, so what's the right answer?

According to this site it's the change in velocity...
http://id.mind.net/~zona/mstm/physics/mechanics/kinematics/slopesAndAreas/areaOfavst/areaOfavst.html

2007-03-02 11:05:13 · 10 answers · asked by Anonymous

2.4times 10 to the -19
2.0times 10 to the -19
4.8times 10 to the -19
5.4times 10 to the -19

2007-03-02 10:57:51 · 1 answers · asked by mcnabbeagles555 2

provide me with the necessary formula and why you chose that one. gracias.

2007-03-02 10:54:37 · 4 answers · asked by meliboo brown 1

and if not what does NASA do to simulate weightlessness in training?

2007-03-02 10:53:50 · 8 answers · asked by Anonymous

Can Someone explain voltage to me in very very simple laymens terms. I've tried reasearching my own, but something dosent really make sense and im still confused.

I get that its the electrical potential difference and that in a battery one end is positive and one is negative, the positive being the high energy and vise versa. Well Wouldn't you think the PROTONS would flow to the negative end because they're the high energy end and they want to balance out? instead the electrons flow. ??

Also, is this right: it takes a force to push positive and negative charge apart in a battery. this creates voltage or electrical potential between the two ends?? why does only 1 end flow(electrons)

im especially confusd because some diagrams so arrows leading FROM the +to the - side, but others say electrons flow out, to the positive end

HELP PLZ

2007-03-02 10:46:48 · 8 answers · asked by Anonymous

A diode is tested with an ohmmeter. ( the readings shown on this link: http://www.picturetrail.com/gallery/view?p=10&imgid=234768559%22%20target=%22_blank%22%3E%3Cimg%20src=%22http://pic70.picturetrail.com/VOL1858/8288201/15473090/t-234768559.jpg%22%20border=%220%22%20alt=%22Free%20Image%20Hosting%20at%20www.picturetrail.com

what is the condition of the diode (normal open, or shorted)?

2007-03-02 10:25:56 · 3 answers · asked by wormhole 2

2007-03-02 10:09:00 · 6 answers · asked by RAMESH K 1

2007-03-02 10:07:28 · 21 answers · asked by Anonymous

Which law or principle states that things in high-pressured areas will go to low-pressured areas?
Need a reliable source.

2007-03-02 10:02:27 · 3 answers · asked by FangZ 2

2007-03-02 09:59:36 · 5 answers · asked by charles b 3

In 1962, measurements of the magnetic field of a large tornado were made at the Geophysical Observatory in Tulsa, Oklahoma. If the magnitude of the tornado's field was B = 13.50 nT pointing north when the tornado was 8.10 km east of the observatory, what current was carried up or down the funnel of the tornado? Model the vortex as a long, straight wire carrying a current.
In 1962, measurements of the magnetic field of a large tornado were made at the Geophysical Observatory in Tulsa, Oklahoma. If the magnitude of the tornado's field was B = 13.50 nT pointing north when the tornado was 8.10 km east of the observatory, what current was carried up or down the funnel of the tornado? Model the vortex as a long, straight wire carrying a current.

plz help

2007-03-02 09:55:49 · 1 answers · asked by lol 1

A cylindrical conducting shell is placed concentric with a cylindrical insulator. Assume that a total charge density λ0 = -2.80 µC/ m is placed on the inner cylinder and a total charge density λ = 3.50 µC/ m is placed on the outer one, r0 = 7.30 cm, r1 = 14.60 cm and r2 = 18.80 cm. Calculate, relative to r = 10·r0 = 73.0 cm:the electric potential at r = 54.60 cm.
cylindrical conductor: E=2kλ /r when r>r0
cylindrical insulator: (r (r>r0) E=2kλ/r

2007-03-02 09:55:14 · 1 answers · asked by 2 2 1

Is this theory even possible according to the laws of thermal dynamics???
The Eternal Return is basically the theory that there is infinite time and a finite number of events, and eventually the events will recur again and again infinitely. Consider the world as a super-complex chess game. If games of chess are played one after another forever, eventually a game will be repeated since there is only a finite number of possible games, it is the same with the world; eventually events will recur in the same order. The world is an eternal process of coming to be and passing away. The process, however, has no beginning or end. Eventually every combination of matter and energy will be realized and repeated and infinite number of times


the reason it is disturbing is because you would live this life over and over and over again. and NOTHING will change. it is exactly how you live it. its like a broken record and is exactly the same each time around. historical events repeat etc.

2007-03-02 09:49:20 · 5 answers · asked by Anonymous

A long, straight wire is surrounded by a hollow metal cylinder whose axis coincides with that of the wire. The wire has a charge per unit length of lambda, and the cylinder has a net charge per unit length of 2lambda. From this information, use Gauss's law to find (a) the charge per unit length on the inner and outer surfaces of the cylinder and (b) the electric field outside the cylinder, a distance r from the axis.

2007-03-02 09:12:02 · 3 answers · asked by hpage 3

The current in a loop circuit that has a resistance of R_1 is 2.00 A. The circuit is reduced to a 1.60 A when an additional resistor R_2=3.00 ohm is added in series with R_1. What is the value of R_1.

2007-03-02 09:06:18 · 3 answers · asked by hpage 3

A train goes forward at a speed of 1m/s for 20 seconds. Then it stops and goes backward at a speed of 0.5 m/s for 4 seconds. After both movements are completed, how far is the train located from it's starting point? (NOTE: We are asking for the trains final location not the total distance that it traveled)

2007-03-02 09:00:40 · 8 answers · asked by Anonymous

im sorry if i spelled it wrong, if i did please excuse my error

2007-03-02 08:39:47 · 4 answers · asked by roger c 2