Physics - October 2006

2006-10-17 16:26:40 · 7 answers · asked by plop 1

The human eye need's a minimum of 2.0x10^-17J of energy to trigger a serious of impulses that eventually reach the brain.
(a) How many photons of red light(700. nm) are needed?
(b) How many photons of blue light (475 nm)?

2006-10-17 16:00:18 · 3 answers · asked by Anonymous

2006-10-17 15:43:44 · 5 answers · asked by Lorena Jayne 2

Hi, I have several question's and i am going to post each question separate so you can get extra points from teh other question's.

1.) A gamma ray emitted by an atom of this this isotope (Cobalt-60) has energy of 1.33 MeV (million electron Volts; leV=1.602x10^-19J). What is the frequescy (in Hz) and wave length (in m) of this gamma ray?

2006-10-17 15:17:27 · 2 answers · asked by Anonymous

2006-10-17 15:04:09 · 2 answers · asked by maria ferisc p 1

A speeder passes a parked cop car at a constant speed of 26.2 m/s.
At that moment, the cop starts from rest with a uniform acceleration of 2.7 m/s^2.
How much time passes before the speeder is overtaken by the cop?

2006-10-17 15:01:33 · 3 answers · asked by crazed1511 1

2006-10-17 14:54:03 · 10 answers · asked by goring 6

for this car it will come off a ramp and will have to travel 3 meters and stop on a mark (where a dime is placed).
i have to design this car! It can't have any source of power, except the momentum gained from the ramp. It could have some form of breaking system!

LOOKING FOR SUGGESTIONS

you are not allowed to have a strong breking system like from a rc car!

2006-10-17 14:45:12 · 2 answers · asked by Anonymous

2006-10-17 14:35:34 · 8 answers · asked by Anonymous

"the principle which underlies the checking of the balance of equations using base quantities"

2006-10-17 14:30:41 · 1 answers · asked by degree 2

for this car it will come off a ramp and will have to travel 3 meters and stop on a mark (where a dime is placed).
i have to design this car! It can't have any source of power, except the momentum gained from the ramp. It could have some form of breaking system!

LOOKING FOR SUGGESTIONS

2006-10-17 14:22:46 · 4 answers · asked by Anonymous

2006-10-17 14:21:17 · 7 answers · asked by bethanie m 1

what would be the weight of 0.1 kg of salami on the moon?

2006-10-17 14:18:48 · 7 answers · asked by water yu 3

2006-10-17 14:16:22 · 6 answers · asked by water yu 3

2006-10-17 14:11:11 · 8 answers · asked by Anonymous

As the 'Conservation Of Energy' rule is a fundamental law of physics, what would happen if it was disproven?

I have always considered the 'laws', as human finds/perspectives on the nature of life/universe. Are they really a definate? More than likely, but never forget they are OUR perspective.

2006-10-17 13:44:14 · 12 answers · asked by thertproductions 1

A 9.0 GeV electron has the same De Broglie wavelength as a high energy proton. What is the kinetic energy proton?


How do u solve this problem

2006-10-17 13:42:54 · 3 answers · asked by steve 1

2006-10-17 13:37:36 · 10 answers · asked by bbcranks 4

A ball is dropeed from a height of 1.50 m and rebounds to a height of 1.20 m. Approximately how many rebounds will the ball make before losing 90% of its energy?

2006-10-17 13:21:15 · 2 answers · asked by Pat M 1

2006-10-17 13:13:35 · 9 answers · asked by Anonymous

2006-10-17 12:54:26 · 5 answers · asked by gabi 1

I think there are a lot of people on this thing fishing for free homework help in Math and Physics. Should we help them at the cost of them actually learning? Why shouldn't we just give them some good hints and a direction and let them figure some of the homework assignment out?

2006-10-17 12:48:31 · 15 answers · asked by Sean S 2

Consider a lawnmower of weight which can slide across a horizontal surface with a coefficient of friction . In this problem the lawnmower is pushed using a massless handle, which makes an angle with the horizontal. Assume that , the force exerted by the handle, is parallel to the handle.Take the positive x direction to be to the right and the postive y direction to be upward.Find the magnitude, , of the force required to slide the lawnmower over the ground at constant speed by pushing the handle.

2006-10-17 12:47:27 · 5 answers · asked by behshad c 1

Is it possible? Me and some freinds were discussing it the other day...

2006-10-17 12:41:02 · 6 answers · asked by Anonymous

It has been proven definitively that there is a time dilation effect at different altitudes. It is a well established principle of general relativity. What, then, is the time dilation at the center of the Earth?

2006-10-17 12:40:48 · 7 answers · asked by garyhorne55 1

In what way is a machine subject to the law of energy conservation? can a machine multiply energy or work input?

i don't understand what it explains in the book.

thank u for helping!

2006-10-17 12:40:08 · 1 answers · asked by Ganbatteru 3

what are the expolsive properties? is the powder slow burning? can only a fuse ignite it, can children take them apart and create bigger bombs?

2006-10-17 12:34:25 · 3 answers · asked by Gary88 1

what happens at a sub microscopic level when water evaporates?

2006-10-17 12:12:58 · 9 answers · asked by Anonymous

1.Rochelle is flying to New York for her big Broadway debut. If the plane heads out of Los Angeles with a velocity of 220. m/s in a northeast direction, relative to the ground, and encounters a wind blowing head-on at 45 m/s, what is the resultant velocity of the plane, relative to the ground?

2006-10-17 11:39:12 · 3 answers · asked by robertk41590 1

A 873-kg (1930-lb) dragster, starting from rest, attains a speed of 26.3 m\s^2 (58.9 mph) in 0.59 seconds.
I need need with the following problems.

a. find the average acceleration of the dragster during this time interval.

b. what is the magnitude of the average net force on the dragster during this time?

c. assume that the driver has a mass of 68kg. What horizontal forces does the seat exert on the driver?

Especially the last part.

2006-10-17 11:36:01 · 2 answers · asked by swimmertommy 1