Physics - January 2007

i really need help on this one

2007-01-07 17:45:44 · 6 answers · asked by Anonymous

(a) yes,but only if you chose the correct system
(b) yes, but only in the horizontal direction
(c) no, because the velocity of tfhe basketball player chanlges with time.
(d)it is a bad question,because momentum conservation is for objects moving at constant speed,and the basketball player is accelerating.

2007-01-07 17:16:53 · 8 answers · asked by good friend 1

(b) a9080kg truck also going 16.0km/hr?.

2007-01-07 16:57:47 · 6 answers · asked by good friend 1

help : /

2007-01-07 16:45:32 · 1 answers · asked by sumit_kn 3

2007-01-07 15:58:15 · 3 answers · asked by shashikant g 1

Basically, I am quitting Engg. to do a Physics Ph.d. because i like to learn Physics. I want to do a Ph.d.... so before I take the plunge, i wanted to know if you know of a downside to doing a Ph.d. Physics?

2007-01-07 15:57:58 · 8 answers · asked by khoj_badami 2

how do our voices transform into electric energy in the telephone when we talk

2007-01-07 15:46:14 · 1 answers · asked by kt 2

yeah...?

2007-01-07 15:37:18 · 8 answers · asked by Anonymous

A skier starts from rest at the top of a 45 m high hill, skis down a 30 degree incline to valley and continues up a 40 m hill. The heights of both hill are measured from the valley floor. Assume you can neglect friction and the effect of ski poles. How fast is the skier moving at the bottom of the valley? What is the skiers speed at the top of the next hill? Would the angles of the hills affect your answers?

2007-01-07 15:05:35 · 3 answers · asked by Anonymous

To attain the maximum range, a projectile has to be launched at 45 degrees if the landing spot and the launch spot are at the same height (neglecting air-resistance effects). Explain how the relation between the vertical and the horizontal components of the initial velocity affects the projectile range.

2007-01-07 15:00:59 · 1 answers · asked by shaft0208 1

which has more energy and power and is more destructive,the biggest spirit bomb on dragenballz or the impact of a 300 mile wide asteroid moving at 75.000 MPH.

2007-01-07 15:00:47 · 8 answers · asked by carlos sims 2

I solved part I and II, but I can’t solve part III. Help me please (thank you).

I)Find the wavelength of the photon emitted when a hydrogen from state n=4 to n=1
Ans: 9.7*10^-8 m

II)What is the momentum of this photon?
Ans: 6.6*10^-27 N.S

III) What is the recoil speed of the hydrogen atom after it has emitted this photon?

2007-01-07 14:48:10 · 2 answers · asked by Kameliya 2

2007-01-07 14:21:13 · 3 answers · asked by lotusdor 2

2007-01-07 14:03:01 · 5 answers · asked by comsublant5 1

2007-01-07 13:59:37 · 3 answers · asked by erica l 1

Given the Earth's mass as 5.9742E24 kg and the Sun's mass as 1.98892E30 kg, and the Earth's distance to the sun as 1.5E11 m, what is the earth's orbital velocity around the sun in meters per second? How would you go about to solve this problem? I know this involves Newton's law of universal gravitation and the centripetal acceleration equation, but I'm stuck.

I'd appreciate any help! Thanks.

2007-01-07 13:49:10 · 5 answers · asked by F E 2

When a dog gets wet, it shakes its body from head to tail to shed the water. Explain, in terms of Newton?s first law, why this works.

2007-01-07 13:28:32 · 6 answers · asked by SMS 1

I know 7: Density, freezing point, boiling point, melting point, color, texture, and crystal shape.

2007-01-07 13:19:14 · 6 answers · asked by Anonymous

I asked a question a while ago on how to test the speed of fiber optics. but it is alot of stuff i still dont know like what to measuer the light that comes out the tip of an optic fiber with or tha arcsin formula. so i really need help with that. thank you. I also need help in understanding the formula n=c/v. thanl you.

2007-01-07 13:12:37 · 3 answers · asked by Drama Queen 1

just wondering

2007-01-07 12:51:21 · 7 answers · asked by dc 3

2007-01-07 12:49:53 · 8 answers · asked by dc 3

A 65-kg. trampoline artist jumps vertically upward with a speed of 5.0 m/s. If the trampoline behaves like a spring with spring stiffness constant 62000 N/m, how far does he depress it?

2007-01-07 12:40:26 · 5 answers · asked by Anonymous

How much money would the average house save per year by using flourscent bulbs? How much do the bubls cost?

2007-01-07 12:27:39 · 3 answers · asked by mbtafan 3

I don't know much about physics, but I know that energy cannot be created or destroyed. So if this is the case, what happens to all of the energy stored inside, say, a person, if they were to die? Think about it, there's all sorts of like, emotional energy, it takes energy for all of the brain processes and such to occur, what happens to it all when the person dies? Could that be what a "soul" is?

2007-01-07 11:51:01 · 13 answers · asked by Anonymous

i had a homework packet due over my holiday break and i need some help with a few of the questions. thanks ahead of time

A highway curve that ha a radius of curvature of 100 m is banked at an angle of 15 degrees. (Hint: the car is turning on an inclined plane, make a force diagram of it and work from there!)


a) determine the vehicle speed for which this curve is appropriate if there is no friction between the road and the tires of the vehicle.

On a dry day when friction is present, an automobile successfully negotiates the curve at a speed of 25 m/s.

B) draw and lable all the forces on the automobile.
c) determine the minimum value of the coeficcient of friction necessary to keep this automobile from sliding as it goes around the curve.

2007-01-07 11:21:10 · 4 answers · asked by milk man 1

2007-01-07 11:20:44 · 2 answers · asked by Sarah 1

2007-01-07 11:06:58 · 10 answers · asked by fahed 1

Stem moves into the cylinder of a steam engine at a constant pressure of 2 times 10 ^5 Pa. The diameter of the piston is 16 cm. and the piston travels 20 cm. in one stroke. How much work is done during one stroke?

2007-01-07 11:06:21 · 4 answers · asked by Kitana 2

I was thinking today about how everything in the universe works according to pressure--from our bodily functions like breathing, to our cars, to outerspace--but I couldn't remember the definition for what pressure is exactly, or what causes it. can pressure exist where nothing is? would that be a vaccum, meaning there is no pressure? so does substance create pressure? why does moving air have less pressure than stagnant air?

2007-01-07 11:04:56 · 1 answers · asked by hobo 6

2007-01-07 10:38:14 · 4 answers · asked by Anonymous