Physics - March 2007

I'm still in high school and I need help on the discovery of the constant G: 6.67 x 10^(-11).

2007-03-20 14:22:00 · 3 answers · asked by meso 1

OK, suppose you are at a table, and grapefruit is on the table. Occasionally, you may get a squirt in the eye from it. In general, for fast does your reflex reaction time have to be in order to avoid the squirt in the eye?

2007-03-20 14:15:14 · 2 answers · asked by Anonymous

I don't know what they're asking you to do =(

2007-03-20 14:12:39 · 1 answers · asked by Starburst 1

Is it possible to learn A.P. physics in 10 days?
The whole A.P. physics?
Its for an UIL competition

2007-03-20 14:12:22 · 1 answers · asked by Blesson 2

2007-03-20 14:10:59 · 3 answers · asked by iamrich 1

Two identical conducting spheres are placed with their centers 0.30m apart. One is given a charge of +12*10^(-9)C and the other is given a charge of -18*10^(-9)C.

The spheres are connected with a conducting wire. After equilibrium has occured, find the electric force between the two spheres.

I don't know how to do this. Heres the formula we have:
Force electric=8.99*10^(9)((charge 1*chagre 2)/distance^2)

Please explain what you did to get the variables charge1 and charge2. Thanks

2007-03-20 14:04:41 · 1 answers · asked by Brian 3

how do you create some tool (that hasn't been created before) that can app. measure the space between two distances like two cars or just two pencils like 2ft away from eachother?

not using a tape measure, or foot steps etc

2007-03-20 13:43:34 · 1 answers · asked by anikabot 2

2007-03-20 13:38:48 · 3 answers · asked by cesi_14 1

A bowling ball encounters a 0.76 m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. If the translational speed of the ball is 4.80 m/s at the bottom of the rise, find the translational speed at the top.

2007-03-20 13:34:55 · 1 answers · asked by mootle 1

the forklift raised the 180 kg pallet a distance of 1.7 meters. how much work was done? if it raised the pallet in 7 seconds, what was the average power consumption?

2007-03-20 13:26:33 · 2 answers · asked by mandy 1

A solid disk rotates at an angular velocity of 0.049 rad/s with respect to an axis perpendicular to the disk at its center. The moment of intertia of the disk is 0.20 kgm2. From above, sand is dropped straight down onto this rotating disk, so that a thin uniform ring of sand is formed at a distance of 0.40 m from the axis. The sand in the ring has a mass of 0.50 kg. After all the sand is in place, what is the angular velocity of the disk?

2007-03-20 13:26:21 · 1 answers · asked by mootle 1

a wheel is rolling along with a speed of 20 meters per second. if the wheel has a diameter of 52 centimeters, what is the angular speed in revolutions per minute?

2007-03-20 13:19:16 · 1 answers · asked by argentina_mandy20 1

hey all... can you plz answer these questions? THANKS!

3. What element has a melting of 570 degreee F?
5. What element has a specific gravity of 1.55?
8. What element has a boiling point of 2897 C and a melting point of 1494 C?
13. What element smells like rotten aggs?
14. What element melts at 419 C and boils at 908 C?

EVEN if u can just answer one for me... u'll be a BIG help! THANKS AGAIN!

2007-03-20 13:02:37 · 3 answers · asked by Anonymous

use the following terms to create a concept map: speed, velocity, acceleration, force, direction, motion

2007-03-20 12:52:41 · 1 answers · asked by rbd fan 1

I need to do an assingment on the second law of thermodynamics related to polution. i need to provide arguments for and against the following statement: "the second law of thermodynamics makes pollution an inevitable result of human activity. There's nothing we can do about it". if you know any links i can check out please let me know....

The second law of thermodynamic basically states that AS we creat order at a local level (building a home), we inadvertently create a greator amount of disorder in our suroundings (fumes, garbage ect)
. All changes either directly or indirectly increase the entropy of the universe mathematicaly
. Entropy= measure of disocder of the system

2007-03-20 12:48:36 · 3 answers · asked by scrumptious_cutie 1

I need to do an assingment on the second law of thermodynamics related to polution. i need to provide arguments for and against the following statement: "the second law of thermodynamics makes pollution an inevitable result of human activity. There's nothing we can do about it". if you know any links i can check out please let me know....

The second law of thermodynamic basically states that AS we creat order at a local level (building a home), we inadvertently create a greator amount of disorder in our suroundings (fumes, garbage ect)
. All changes either directly or indirectly increase the entropy of the universe mathematicaly
. Entropy= measure of disocder of the system

2007-03-20 12:47:39 · 3 answers · asked by scrumptious_cutie 1

2007-03-20 12:40:31 · 7 answers · asked by jerry m 1

would it be possible to stop,turn around,and see yourself coming?

2007-03-20 12:31:40 · 5 answers · asked by J-Bone 2

the metric system

2007-03-20 12:30:11 · 10 answers · asked by Anonymous

I'm interested in your answer to this question, but I would especially like to know if you have read the paper "Does a Global Temperature Exist?" and, if you have what you think about it.

I would especially like to hear detailed technical (involving thermodynamics and so on) arguments either in support of it or in rebuttal.

Citation: (Authors: Christopher Essex, Ross McKitrick and Bjarne Andresen), Journal of Non-Equilibrium Thermodynamics; Volume: 32 | Issue: 1;
Cover date: February 2007

Link/URL: http://schwinger.harvard.edu/~motl/global-temperature-not-exist.pdf

2007-03-20 12:30:10 · 4 answers · asked by pollux 4

2007-03-20 12:28:37 · 9 answers · asked by Anonymous

An electromagnetic experiment on the USS Philadelphia testing for stealth. Reported ship disappearing along with small crew on board. Afterwards some crew members were stuck between walls and molecularly attached to floor.
HI TOMATAROJA

2007-03-20 12:21:58 · 2 answers · asked by PT109 1

I need help deriving the quadratic equation,

h= -16t^2+vt+s

where t is time, v is velocity, s is starting height, and h is the height of where the object will be.

I need to be able to explain where this formula comes from and why it is the way it is. I have been searching all over the net, but I can't find anything. Please help as soon as possible. Thanks.

2007-03-20 12:21:40 · 1 answers · asked by Micha 2

1. In order to compare the effects of a changing net force on acceleration, what must be kept constant?

2. In order to compare the effect of changing the mass on acceleration, what must be kept constant?

Thanks!

2007-03-20 12:10:36 · 4 answers · asked by aeckzs 1

1. Your family is moving, and you are asked to help move some boxes. One box is so heavy that you must push it across the room rather than lift it. What are some ways you could reduce friction to make moving the box easier?

2.A kangaroo hops 60 m to the east in 5 seconds.
a. what is the kangaroo's speed?
b. What is the kangaroo's velocity?
c.The kangaroo stops for a drink of water, than starts hopping again to the south. Every second, the kangaroo's velocity increases 2.5 miles south. What is the kangaroo's acceleration after 5 seconds?



please rate from 1 - 10 how much you think your right
1 being wrong
10 being right

2007-03-20 11:59:59 · 3 answers · asked by rbd fan 1

1. How is it possible to be accelerating and traveling at a constant speed?

2. Describe the relationship between motion and a reference point.

3. Explain why its important for airplane pilots to know wind velocity, not just wind speed, during a flight.

4. Explain the difference between mass and weight.

5. Explain how using the term accelerator when talking about a car's gas pedal can lead to confusion, considering the scientific meaning of the word acceleration.
( just in case you dont know the scientific meaning acceleration=the rate at which velocity changes.)

4.

2007-03-20 11:52:26 · 3 answers · asked by rbd fan 1

If i am at pointA and want to go to point B at half the distance with each move when will i get there? or will I ever get there?
Is there a mathmatical equation for this?

2007-03-20 11:44:57 · 4 answers · asked by xrayman1987 2

An electric car is designed ro run on a bank of batteries w/ a total potential difference of 18 V and a total energy storage of 1.3 x 10^7 J. if the electric motor draws 9.6 kW , what is the current delivered to the motor?

Also if the car moves at a steady pace speed of 30.0 m/s hor far will the car travel before it is out of juice.(assume is draws 9.6 kW)

Problem: i know i need (current I) but i have too many variables to use

i used P= V x I to get 722222.2 but it seems wrong

can you help me out?

2007-03-20 11:43:33 · 2 answers · asked by TheThing 2

1.Friction is a force that
a. opposes an objects motin.
b. does not exist when surfaces are very smooth.
c.decreases with larger mass.
d. all of the above

2. Rolling friction
a. is usually less than sliding friction.
b. makes it difficult to move objects on wheels.
c. is usually greater than sliding friction.
d. is the same as fluid friction.

3.If earth's mass doubled your weight would
a. increase because gravity increases.
b. decrease because gravity increases.
c.increase because gravity decreases.
d. not change because you are still on earth.

4. The amount of gravity between 1 kg of lead and Earth is __________ the amount of gravity between 1 kg of marshmallows and Earth.
a. greater than
b. less than
c. the same as
d. none of the above

5.Use the following to create a concept map: speed, velocity, acceleration, force, direction, motion

thank you so much

2007-03-20 11:39:48 · 3 answers · asked by rbd fan 1

sam wants to cross a 80m wide river.the motorboat can travel at 5m/s in still water. he points the boat straight [N] across the river but forgets about the 1.2m/s [E] current. find how far downstream the boat will reach the opposite shore.
the answer is 19.2m
thanks!!!1

2007-03-20 11:37:12 · 3 answers · asked by Anonymous