Physics - February 2007

my answer is yes..am i correct??

2007-02-20 20:22:42 · 3 answers · asked by Anonymous

Can the mass of a photon be varied?

2007-02-20 20:16:05 · 8 answers · asked by rajesh bhowmick 2

If anyone can help me out with this I would really appreciate it. I can not come up with the right answer that's in the book.

In the dangerous "sport" of bungee jumping, a daring student jumps from a hot-air balloon with a specially designed elastic cord attached to her waist. The unstretched length of the cord is 25.0 m, the student weighs 700 N, and the balloon is 36.0 m above the surface of a river below.

Calculate the required force constant of the cord if the student is to stop safely 4.00 m above the river.

2007-02-20 19:16:52 · 3 answers · asked by Michelle 1

A particle of mass 1.1454X10^-25 kg. and charge of magnitude 4.8 x 10^-19 C is accelerated from rest in the plane of the page through a potential difference of 218 V between two parallel plates. The particle is injected through a hole in the right-hand plate into a region of space containing a uniform magnetic field of magnitude 0.138 T oriented perpendicular to the plane of the page. The particle curves in a semicircular path and strikes a detector.

What is the magnitude of the force exerted on the charged particle as it enters the region of the magnetic field B? Answer in N

2007-02-20 18:31:29 · 1 answers · asked by beehappinow 1

A particle of mass 1.1454X10^-25 kg. and charge of magnitude 4.8 x 10^-19 C is accelerated from rest in the plane of the page through a potential difference of 218 V between two parallel plates. The particle is injected through a hole in the right-hand plate into a region of space containing a uniform magnetic field of magnitude 0.138 T oriented perpendicular to the plane of the page. The particle curves in a semicircular path and strikes a detector.
What is the speed of the charged particle as it enters the region of the magnetic field?

2007-02-20 18:30:35 · 1 answers · asked by beehappinow 1

A particle of mass 1.1454X10^-25 kg. and charge of magnitude 4.8 x 10^-19 C is accelerated from rest in the plane of the page through a potential difference of 218 V between two parallel plates. The particle is injected through a hole in the right-hand plate into a region of space containing a uniform magnetic field of magnitude 0.138 T oriented perpendicular to the plane of the page. The particle curves in a semicircular path and strikes a detector. What is the sign of the charge of the particle? Neglect relativistic effects.
1. The charge cannot be determined for info given.
2. The charge q is negative.
3. The charge q is positive.

2007-02-20 18:28:54 · 3 answers · asked by beehappinow 1

2007-02-20 18:14:16 · 5 answers · asked by Anonymous

2007-02-20 17:54:45 · 2 answers · asked by Anonymous

When a photon is traveling through space, is it really physically oscillating (as in a physical translation or deviation from its velocity vector), or does it just have wavelike properties (such as its sinusoidal electric and magnetic fields)?

2007-02-20 17:36:24 · 6 answers · asked by Brian 3

A daring 510-N swimmer dives off a cliff with a running horizontal leap. What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff?

2007-02-20 17:22:21 · 3 answers · asked by Anonymous

weighing yourself on planet Jupiter

2007-02-20 17:16:19 · 8 answers · asked by Anonymous

2007-02-20 17:08:38 · 1 answers · asked by Jackie G 1

Can you suggest some object large enough that a single one can be seen but small enough that one billion of them can be gathered in one place in a reasonable and practical way?
As a teacher, I would like to demonstrate to students how extremely huge 1,000,000,000 is. A physical example is the best way to do this.

2007-02-20 17:03:06 · 11 answers · asked by Jeffrey K 7

When I squeeze out the air in a self-sealing zippered top bag both sides of the vinyl bag act like they are glued together. If outer space is suppose to be a vacuum does that mean space is but two dimenssions like the vinyl bag?

2007-02-20 16:48:42 · 12 answers · asked by Anonymous

If you have a glass with liquid in it, any liquid and there are ice cubes in it, what will happen to the water level as the ice cubes melt? In other words in a glass with water and ice in it will the water level raise, or lower, or stay the same as the ice cubes melt? If you have the answer than prove it, give a link to a website or explain it, dont just say the answer.

2007-02-20 16:45:36 · 10 answers · asked by Anonymous

Can you give me some examples of physical quanities that are described mathematically with tensors?
(Rank 2 tensors)

2007-02-20 16:38:04 · 2 answers · asked by Jeffrey K 7

plz plz help!! thank thank thank you!!

2007-02-20 16:34:02 · 4 answers · asked by Crystal 2

science test coming up lol, plz help! and ty!!

2007-02-20 16:17:17 · 3 answers · asked by Crystal 2

2007-02-20 16:10:23 · 9 answers · asked by Sublime 2

nickel how many nuetrons,electrons and protons are in the element nickel?

2007-02-20 15:37:06 · 4 answers · asked by maureen l 1

Can you explain it for me and the process an element or particle would go through? I know its definition, but I can't solve it if I were given a problem. And don't give me a formula; we're not supposed to solve it that way.

2007-02-20 15:20:36 · 5 answers · asked by broadway_enthusiast 2

okay im doing a science project on weather a magnets strength is effected in cold or hot weather. I LOST MY MAGNET SOO PLEASE HELP ME!!!!! does it affect the strength?????

2007-02-20 15:02:47 · 3 answers · asked by Kyle G 2

car A is traveling north at 30 m/s and car B is traveling south at 20 m/s. if both cars have a southward acceleration of 1 m/s2, comapre their speeds after 1 second

2007-02-20 14:54:19 · 4 answers · asked by maria 3

a racing car accelerates at 12 m/s^2. find the force that the back of the seat exerts on the 95 kg driver.

2007-02-20 14:52:55 · 2 answers · asked by mandy 1

a 412 kg crate is at rest on a level surface. at t = 0 seconds, a horizontal force of 1630 newtons is applied to the crate to give it a constant acceleration to the left. (a) given that the coefficient of kinetic friction is .25, what is the amount of kinetic friction force? (b) use the impulse-momentum equation to find the velocity of the crate at t = 3.5 secs.

2007-02-20 14:46:46 · 2 answers · asked by mandy 1

2007-02-20 14:45:22 · 14 answers · asked by Yahoo! 5

2007-02-20 14:43:56 · 3 answers · asked by jin 1

2007-02-20 14:33:57 · 6 answers · asked by Anonymous

2007-02-20 14:31:32 · 3 answers · asked by screwyouguys_19 2

What is percentage of fundemental matter, NOT Dark matter. please?

2007-02-20 14:29:40 · 3 answers · asked by CLIVE C 3