Physics - August 2007

2007-08-26 02:11:33 · 3 answers · asked by Kashi 1

A small piece of styrofoam packing material is dropped from a height of 2m above the ground. Until it reached terminal speed, the magnitude of its accelleration is given by a=g-bv. After it fall 0.500m, the foam effectively reaches terminal speed and then takes 5.00 s more to reach the ground.
a) what is the value of the contant b?
b) what s the accelleration when the speed is 0.150m/s?

so far i know the accelleration is 9.8m/s^2 when t=0 .... i simply cannot find the constant ...my dad said its 32.75..but he refuse to tell how he came by this answer...
Thanks in advance

2007-08-26 01:00:59 · 1 answers · asked by Anonymous

having trouble, the answer should come out to 0.027... i keep getting 1.6

2007-08-25 23:16:24 · 5 answers · asked by Anonymous

A Projectile reached a maximum height of 50 meters and range from 285 meters. Determine its initial speed and inclination wherein it is fired.

what will I do to get the initial speed and the inclination?

how do I answer it? need help! how do you solve this?

2007-08-25 21:56:03 · 6 answers · asked by rachel is blue 1

One force acting on a machine part is
F = (-5.00N)i + (4.00N)j.
The vector from the origin to the pouint where the force is applied is
r= (-4.50m)i + (1.50m)j.


a) Determine the direction of the torque using the right hand rule.
b) Calculate the magnitude of the torque produced by this force.
c) From the answer in b), what is the direction of the torque? (this must be in match with the answer in b))

2007-08-25 21:43:26 · 1 answers · asked by nadanilnone 1

This is one of the questions for a science assignment and I really can't find an answer. I have found many websites explaining about fibre optics but they are too hard to understand. I would appreciate if anyone can help answer me this question in simplest form. Thank you!

2007-08-25 18:27:29 · 8 answers · asked by wicked_7_stars 1

How do you find the height where two same marbles have the same velocity when one marble is dropped from the Earths atmosphere (g=9.8) and the other is dropped from the Moons atmosphere (g=1.6)? Both are dropped from the same height

I have absolutely no idea where to start...

2007-08-25 18:27:16 · 1 answers · asked by =] 1

2007-08-25 17:31:14 · 6 answers · asked by Kasturi N 1

Ken argues that container one has a greater economy rate because it is a cube. Nick argues that container two has a greater economy rate because its volume is greater.
Who is right and why?
Container one is a cube and has a length, width and height of 10cm.
Container two is a hexagonal prism and has a length of 5cm, width of 12.5cm and height of 20cm

2007-08-25 17:03:27 · 1 answers · asked by Physics 101 1

If the speed of light is the limit according to the relativity theory, is it a reachable limit, or un unreachable limit?
Also, if you got to the speed of light, according to wich point of view would that be taken?

2007-08-25 16:46:37 · 4 answers · asked by Sebolains 2

Suppose you’re riding a Ferris wheel that’s slowing down at a steady rate. As the wheel slows down, does your acceleration point more and more towards the center of the wheel, or more and more away from it? Explain.

2007-08-25 16:43:50 · 2 answers · asked by Anonymous

the x axis is time and the y axis is distance how do i find the average acceleration of the line?

2007-08-25 15:55:02 · 1 answers · asked by Anonymous

A boat moves through the water of a river at 8 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 1.0 m/s, how long does it take the boat to make a round trip consisting of a 175 m displacement downstream followed by a 175 m displacement upstream?

Can someone please give me some help in getting this problem started? I've been working on Physics homework for 5 hours now and I feel like my brain is so fried I can't even start this problem (it's my last one). I would appreciate the help!

2007-08-25 15:27:25 · 6 answers · asked by Lisa R 2

Seems like a question, but do you die on impact (on the ground) or would you die in mid-air from shock or a heart attack? And what's the highest floor/story that anyone every jumped from and survived?

2007-08-25 15:20:56 · 10 answers · asked by chocolate_cat 3

Okay, I'm reading about the atomic theory and how it explains the formation of different compunds by the same two elements, right? Well, it explains that "only whole atoms combine in chemical compunds between the same elements. Therefore, different compunds formed by the same two elements must result from combinations of different relative numbers of atoms."

Can you explain this in English for me?

2007-08-25 14:05:53 · 3 answers · asked by Caramel 2

I decided for chuckles to calculate the telescope aperture required to resolve an elephant at a distance of 5 light years and came up with a 9 million km mirror. I may have slipped up. Let resolution be defined as Dawes' at .116/m of aperture, and y'all can handle the trig and the size of the elephant any way you want within reason.

This is a tricky calculation with lots of zeroes so I thought I would throw it out for someone to double check.

I'll be there's more than one person out there who can crunch this so "best answer" may be reserved for the answer that includes a reasonable calculation of the thickness and cooling time of the pyrex. You can choose another substrate if you like. Don't forget to show your work! (within reason)

thanks.

2007-08-25 13:43:21 · 3 answers · asked by gn 4

If 5 amps is passing through a 9-volt power source from the negative terminal to the positive terminal does the current passing through increase, decrease, or stay the same? Can't seem to figure this out.

2007-08-25 12:28:31 · 7 answers · asked by Anonymous

Air resistance can be neglected

2007-08-25 12:11:46 · 3 answers · asked by kntagler 1

The displacement of a string carrying a traveling sinusoidal wave is given by y(x,t) = A sin (kx-wt-)φ. At time t=0 the point at x=0 has a displacement of 0 and is moving in the +y direction. The phase constant φ may take the value:
a. 180 deg. b. 90 deg.

2007-08-25 12:03:43 · 1 answers · asked by MatT 7

can someone give me a good answer that relates to a scientific answer.

2007-08-25 09:21:59 · 2 answers · asked by Anonymous

When an object is moving at constant acceleration, is it accelerating or is it moving with a same speed? Why?

2007-08-25 08:23:08 · 8 answers · asked by Anonymous

i pour out water at the length of 3 meters, after a moment it divides into small drops, how
can i make it move only in one direction?
http://www.aquatic-show.com/site/More-photos-of-Aqua-graphic-44.html

2007-08-25 08:16:08 · 4 answers · asked by majidf_elc 1

If a built a rocket which ways 10Kg with Propellant and the Propelllant ways 9Kg and It Burn for 2min at a rate of 75g/sec and most importantly tell me

HOW YOU WORKED THAT OUT.

And i dont want it that compilicated because then i will not understand the equation and the answer i just want it normal which you will be sure i can uderstand.

2007-08-25 07:55:47 · 1 answers · asked by Hamza 1

how can i freeze time so i can get a little freedom.

2007-08-25 07:45:59 · 7 answers · asked by Anonymous

Why does an ice skater move across the ice faster than a runner on an asphalt track?

2007-08-25 07:43:03 · 4 answers · asked by dogiekitten 1

If its F=ma then what is the mass of the photon?

2007-08-25 07:25:29 · 5 answers · asked by jim m 5

Now Imagine theres a point 'A' vertically above the surface of earth. the distance of point A from the horizontal plane is given by X metres .also, imagine theres no atmosphere.

Now Imagine from within that point A , a chain {made of identical oval shaped rings linked sequentially} keeps on appearing {materializing}

and it starts to fall down due to gravity and hits the ground.the liks which appear from within point A are static and are pulled down by the links below them i.e., the faster you pull the faster the new links materialize. now what will be the velocity of the chain { particularly the rings} when they hit the ground if X = 20 metres .(remember the chain keeps on materializing from the point A}.

i think the terminalvelocity of the chain can be given by Vt = squarerootof (Xg)

where g = acceleration due to gravity(take g= 10 m/s^2).
now sqrroot of(20*10) = 14.14.so , here Vt = 14.14.

2007-08-25 06:40:49 · 3 answers · asked by balaji.k 2

2007-08-25 06:16:01 · 13 answers · asked by Anonymous

A small light fixture is on the bottom of a swimming pool, 0.50 m below the surface. The light emerging from the water forms a circle on the still water surface. What is the diameter of this circle?

________m

2007-08-25 06:00:50 · 1 answers · asked by Anonymous

when a body of mass m moves up on an incline plane of angle A through a distance s show that the work done against the friction is umgcosA.s where u is the coeficient of friction of plane

2007-08-25 05:09:43 · 3 answers · asked by sameerteacher01 1