Physics - December 2007

2007-12-13 00:59:36 · 1 answers · asked by chatter p 1

2007-12-13 00:44:48 · 11 answers · asked by Anonymous

A battery is a chemical device for storing energy. A capacitor is also a device for storing energy.Discuss the possibility of replacing batteries with capacitors.Is it prctical? Why?
Tnx. I hope someone can help me.

2007-12-12 22:52:59 · 4 answers · asked by the Divine 2

2007-12-12 22:11:40 · 2 answers · asked by Mandy 2

A grandfather clock is controlled by a swinging brass pendulum that is 1.3m long at a temperature of 20 degree's celcius.

(A) what is the length of the pendulum rod when the temperature drops to 0 degrees celcius?

(B) if a pendulum's period is given by t=2pi(square root of L/g),
where l is its length, does the change in length of the rod cause the clock to run fast or slow?.

2007-12-12 22:01:56 · 2 answers · asked by john s 2

Thanks for your answer. I am just so much interested in Physics, astronomy, nuclear science and mathematics.

2007-12-12 21:56:31 · 6 answers · asked by champscience 4

2007-12-12 21:11:13 · 4 answers · asked by eternal_snow 2

2007-12-12 20:18:08 · 5 answers · asked by Bullet Girl 2

What are people's thoughts on here about Garret Lisi's paper? It is pretty interesting. At least there are some predictions that the LHC can test.

2007-12-12 19:29:19 · 2 answers · asked by Anonymous

1.Space Traveler whose mass is 75kg leaves the earth.compute his weight?
a. on earth b. on mars,where g=3.8m/s

2. A box of mass 0.6 slug is moving w/ a constant velecity of 15ft/s on a horizontal surface.The coefficient of sliding friction between the box and the surface is 0.20.what horizontal force is required to maintain the motion?

3. A dictionary is pulled to the right at consstant velocity by a 10N force acting at 30% above the horizontal.the coefficient sliding friction between the dictionary and the surface is 0.5.What is the weight of the dictionary?

2007-12-12 19:12:17 · 3 answers · asked by dhonz09 1

How can i explain how Newton's Cradle (executive toy) works in light of the Law of Conservation of Momentum?

2007-12-12 17:18:08 · 1 answers · asked by Marcus 1

2007-12-12 15:26:53 · 18 answers · asked by Devilsk8er77 1

How does a sound change if its source moves towards you, passes, and then moves away from you?......Which electromagnetic wave interacts the most with matter? Why?.......what is the significance of each of these sounds 0dB 100dB 120dB 200dB....best answer too answer that sounds most accurate

2007-12-12 15:24:11 · 1 answers · asked by Jim J 1

What is the centripetal acceleration of a body moving in a circle of radius 10.0 m at at constant speed of 5.0 m/sec?

a. 2.5 m/sec^2
b. 0.5 m/sec^2
c. 12.6 m/sec^2
d. 0.4 m/sec^2

formula?
please try to explain this problem thoroughly....please

2007-12-12 14:54:07 · 1 answers · asked by Anonymous

2007-12-12 14:43:45 · 1 answers · asked by alexandervk 1

The earth (mass= 5.98 x 20^24 kg) orbits around the sun (mass= 1.99 x 10^30) at an average distance of 1.50 x 10^1 m. What force does the earth exert on the sun?

a. 5.29 x 10^33 N
b. 5.28 x 10^32 N
c. 3.53 x 10^22 N
d. 8.85 x 10^8 N

please explain thoroughly how to do this problem.. please.

2007-12-12 14:41:55 · 1 answers · asked by Anonymous

Is it possible for two objects with the same mass to have different rotational inertias?

_____ Yes, if the two objects of the same mass are rotating with different angular velocities then they will have different rotational inertias.

_____Yes, if the same mass is distributed at different distances from the axis of rotation in the two cases.

_____No, two objects with the same mass will always have the same rotational inertia because only the total mass not the distribution of mass determines the rotational inertia.

There may be more than one answer.

2007-12-12 14:08:25 · 3 answers · asked by shamsan_415 1

Piezoelectricity is the property of some crystals to output electricty when put under mechanical stress.

Does anyone have any ideas about what your could use the electricty from this for???

2007-12-12 13:56:16 · 5 answers · asked by gabriel_d_popuch 1

how do we sense smell? when will we evolve to sense other dimensions? what is it about the brain that stores memory and can creat out of nothing or wonder? how can we use 100% efficiency in gas engines or electric enginges? Is white a color? do you think we can benifit or even one day having downloads into the brain or sharing memory so that at age 2 you know calculus? when will other life decide to talk to us? out of the whole space there has to be other worlds fit for liefe. there is.
space is infinite which means that there is life theres an infinite chance of it.
of you can travel the speed of light time slows down so if you travel fast enough can you slow time to a negative speed thus traveling back in time?
how can we utilize other forms of energy? food can bbe used to power a light bulb but its nto efficient enough per food amount. the answer to any of these questions is greatly aappreciated. thank you.
and why was there matter at all? where did matter come from...............

2007-12-12 13:55:49 · 3 answers · asked by Kai 2

A net torque of 36 N·m is applied to a disk with a rotational inertia of 10 kg·m2. What is the rotational acceleration of the disk?
_______ rad/s2

2007-12-12 13:48:18 · 1 answers · asked by shamsan_415 1

at an angle of 37 degrees w/ respect to the horizontal and the cannonball is 7m above the ground at this time.
a. What is the maximum height above the ground reached by the cannonball?
b. Assuming the castle walls and lands backdown on the ground, at what horizontal distance from its release point will it lands?The y-axis points up.

2007-12-12 13:37:49 · 2 answers · asked by elle 2

how does hurricanes and physics relate

2007-12-12 13:34:33 · 1 answers · asked by SlimthugPaulWallMikeJones 1

or different?

2007-12-12 13:27:07 · 3 answers · asked by Da C 2

Using the Newton's laws of motion along with Kepler's laws, how is Newton's inverse square law of gravity deduced?

2007-12-12 13:21:50 · 1 answers · asked by Gabe 3

2007-12-12 13:19:05 · 2 answers · asked by megasword33 1

I'm writing a trebuchet report for Physics and I need to find the potential energy and kinetic energy of the trebuchet (the kinetic energy right when my projectile leaves the sling).

Also I need to answer the questions:

If all potential energy is used, and projectile launched at 45 degree angle, what would be max range?

What is the mechanical advantage of the trebuchet?

If you can help, thank you!

2007-12-12 12:54:53 · 2 answers · asked by Rennix 2

OK. SO, Ff= (mu)Fn (also known as the FUN equation-as likely as not!) anyways, i know the Fn, and i need to find the frictional force. Then there is this EVIL coefficient of friction. and this is where i crumble. so i have the coefficient of static friction and the coefficient of kinetic friction (this is all about a block of wood sliding across a table by the way) and now i need to know the frictional force. BUT to find the frictional force, i need the coefficient of Friction. HOw do i find this?? do i use the kinetic coefficient? What does this mean?? PLEASE HELP ME. thank you very much

2007-12-12 12:28:16 · 2 answers · asked by Anonymous

And to all the sarcastic people, who are going to say "because your able to use your eyes" thats not what i mean, when you look into a mirror how does it give you a image of you back, grrr..kinda hard to say but what makes a mirror give a reflection of the enviroment, like if i stand in front of my bathroom mirror why do i see myself? When i look at the wall i dont see my reflection? so anybody know this and thanks.

2007-12-12 12:05:33 · 5 answers · asked by Anonymous

Find net force on the ring..?
There are four forces acting on a ring.
Force A is 20 lbs at an angle of 20 degree relative to the horizontal.
Force B is 20 lbs at an angle of 50 degrees relative to the horizontal.
Force C is 15 lbs at an angle of 30 degrees below the horizontal.
Force D is 30 lbs at an angle of 70 degrees below the horizontal.
What is the net force on the ring?
Image kinda looks like this:
http://i76.photobucket.com/albums/j4/pxg...

2007-12-12 12:01:44 · 1 answers · asked by Anonymous

Take a look at this video clip: http://www.youtube.com/watch?v=PmZyB_ghpa0

What are the Physics? What weather conditions are best to fly and why? Could he land without a parachute and live, and if so, how? Is he insane? Is this Awsome?

Here is another clip where he flys within inches of a cliff: http://www.youtube.com/watch?v=ttz5oPpF1Js&feature=related

At one point in this second video, the dude comes within twenty feet of a car on a road making a hairpin turn. If he collided with the car, could he knock it off the road?

[Note: Have to keep the questions related to physics ;-)]

2007-12-12 11:43:15 · 6 answers · asked by Frst Grade Rocks! Ω 7