Physics - November 2006

The same object is dropped in a vacuum and then in air. Which of the parameters (velocity, distance, acceleration) vary and which remains constant during succeeding seconds of time.

2006-11-12 13:29:26 · 3 answers · asked by Anonymous

A brick is thrown upwards from the top of a building at an angle of 18.9 degrees above the horizontal and with an initial speed of 21.2 m/s. (The acceleration due to gravity is 9.8 m/s^2). If the brick is in flight for 2.8 s, how tall is the building? (in meters)

2006-11-12 13:26:36 · 3 answers · asked by Anonymous

2006-11-12 13:16:28 · 9 answers · asked by sdavis7766 1

Can you tell me how any of these terms relate to the Olympic sport luge? inertia, free fall, terminal velocity, projectile motion, momentum, motion, force, static friction, kinetic friction

PLEASE HELP IF YOU CAN!!

2006-11-12 13:07:59 · 1 answers · asked by marpiesharker 1

2006-11-12 13:03:29 · 9 answers · asked by Her man 1

I tried this twice before and got good answers but I had already figured that much out as much as they were telling me, so this time I drew as good of a picture as I could and a discription of my question. If any of you super physisics or engineers could give me a little help I'v included a link to my blog where I had more room to frame the question.


http://blog.360.yahoo.com/blog-B_YS8yk7dK7xe4SNjrtluB357hTQ

Thanks for any help in advance. JohnK

2006-11-12 13:01:12 · 2 answers · asked by John K 1

2006-11-12 12:57:50 · 9 answers · asked by Her man 1

The scenario is a lighthouse at the North Pole, whose beam rotates at 1 revolution per second. Ignoring attenuation by the earth's atmosphere and the rotation of the earth, my original question was how far along the beam would it be travelling tangentially at the speed of light. The answer that were provided said that the "beam" is not solid and that in fact the photons in the beam are all travelling radially, with no tangential component. This I can accept. Now for my next installment:
Imagine that there is a mirror in the shape of an anulus (ring) at a distance "d" from the lighthouse:
1) What is the value of "d" (let's call it D) such that the intersection of the beam of light and the anulus moves at the speed of light (c)?
2) If the anulus was at a distance of 2D from the lighthouse, what will the speed of the intersection of the beam and the anulus be? Let's call it z.
3) What will I observe as I look towards the anulus from the lighthouse?(i.e. direction of reflected light

2006-11-12 12:38:05 · 1 answers · asked by Mez 6

a box of books weighing 319 N is shoved across the floor by a force of 485N exterted downward at an angle of 35 degrees below the horizontal.
a. if uk between the box and the floor is 0.57, how long does it take to move the box 4.00 m starting from rest.
b. if uk between the box and the floor is 0.75 how long does it take to move the box 4.00 m from rest.

2006-11-12 12:17:53 · 3 answers · asked by socom_lover 2

I can NEVER find the thing I am looking for! It just doesnt seem to be there, then all of a sudden it appears in a spot that you have already looked!

2006-11-12 12:17:51 · 5 answers · asked by Kimberly V 2

2006-11-12 12:09:26 · 2 answers · asked by veronica s 1

2006-11-12 11:47:42 · 11 answers · asked by icecube2008 1

Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 1 10-3 rad/s, while the other has an angular speed of 3.30 10-3 rad/s. How long will it be before they meet?

2006-11-12 11:37:52 · 2 answers · asked by Alan l 1

A person is standing on a spring bathroom
scale on the °oor of an elevator which is
moving up and slowing down at the rate of
1:59 m=s2.
The acceleration of gravity is 9:8 m=s2 :
If the person's mass is 83:1 kg, what does
the scale read? Answer in units of n.

2006-11-12 11:15:12 · 3 answers · asked by kavita 1

A student stands on a bathroom scale in an
elevator at rest on the 64th °oor of a building.
The scale reads 849 N. As the elevator moves
up, the scale reading increases to 942 N, then
decreases back to 849 N.
The acceleration of gravity is 9:8 m=s2 :
Find the acceleration of the elevator. An-
swer in units of m=s2.

As the elevator approaches 74th °oor the scale
reading drops as low as 774 N.
What is the acceleration of the elevator?
Answer in units of m=s2.

2006-11-12 11:14:20 · 2 answers · asked by kavita 1

A projectile (mass = 0.24 kg) is fired at and embeds itself in a target (mass = 2.61 kg). The target (with the projectile in it) flies off after being struck. What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off after being struck?

2006-11-12 11:14:14 · 3 answers · asked by Alan l 1

A person stands on a scale in an elevator.
The maximum and minimum scale readings
are 652:4 N and 301:8 N, respectively.
The acceleration of gravity is 9:8 m=s2 :
Assume the magnitude of the acceleration
is the same during starting and stopping, and
determine the weight of the person. Answer
in units of N.

Determine the person's mass. Answer in units
of kg.

Determine the acceleration of the elevator.
Answer in units of m=s2.

2006-11-12 11:11:23 · 2 answers · asked by kavita 1

2006-11-12 10:52:28 · 3 answers · asked by Anonymous

http://www.kasd.org/~ddrummer/GP_Momentum_WS5_1.pdf#search='dummies%20worksheet'


http://www.kasd.org/~ddrummer/GP_Momentum_WS5_2.pdf#search='dummies%20worksheet'

2006-11-12 10:37:03 · 1 answers · asked by SHAKIL A 1

2006-11-12 10:27:29 · 1 answers · asked by Cister 7

And if you do not know describe a method to do just that. May be you could also explain why the speed of the suns rays when measured in a rising sun and a setting sun are the same?

2006-11-12 10:22:56 · 3 answers · asked by Anonymous

A crate rests on a flatbed of a truck that is initially traveling at 15m/s on a level road. The driver applies the brakes and the truck is brought to a halt in a distance of 38m. If the deceleration of the truck is constant, what is the minimum coefficient of friction between the crate and the truck that is required to keep the crate from sliding??? Please Explain. Thank you.

2006-11-12 10:12:55 · 3 answers · asked by Tennis2127 2

2006-11-12 10:09:58 · 2 answers · asked by M.K 2

An ideal gas occupies a volume of 2.2 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container. = 5.65e19

If the pressure is reduced to 2.6 10-11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container?

2006-11-12 10:00:38 · 1 answers · asked by mastersource2005 5

2006-11-12 09:46:45 · 12 answers · asked by Anonymous

2006-11-12 09:24:22 · 6 answers · asked by aminima 1

find thermal energy of aluminum--block has a mass of 4.5kg and its atoms are moving with a velocity 15m/s squared and the tempature is 5 degrees C and the specific heat capacity is 22.5 J/Kg

2006-11-12 09:19:12 · 2 answers · asked by sugarbayb846 2

I have to do an experiment about density. we have to find an object the will sink to the bottom of a tub filled with water (about a foot or so of water) and then after exactly one minute of staying on the bottom it has to float. Our teacher suggested something that gives of a gas (non toxic) or something that will decrease in mass or increase in volume. the density has to change for it to be able to float... any ideas.... i was thinking of tying an object to a sugar cube but i haven't tried it yet and i would really like other ideas...

2006-11-12 09:07:01 · 7 answers · asked by Anonymous

2006-11-12 08:52:51 · 5 answers · asked by GMEN 1

1) what is the exact number of coulon?
2) what is the function of electric energy(Joul- I think )?
thankx :)

2006-11-12 08:49:14 · 2 answers · asked by gilparsay 1