Physics - March 2007

2007-03-11 18:56:37 · 1 answers · asked by inklyric 1

hint : i think it has got something to do with pressure and area.area is inversely proportional to pressure

2007-03-11 18:47:24 · 11 answers · asked by SWETA 2

2007-03-11 18:31:59 · 3 answers · asked by FRED F 1

At the end of a run on a quarter-mile track the parachute opens and the car slows from 210 South to 10 mph in 10 secs. What was the average acceleration of the car during that 10-sec parachute breaking period?

2007-03-11 18:23:56 · 10 answers · asked by stayin alive 2

please click on this link for the diagram: http://img.photobucket.com/albums/v98/musicis4fools/Efieldlines.jpg

according to this diagram, does the E field strength increase as you go right? or does it increase as you go down? or is the E field uniform throughout?

i think it would increase as you go right, since you have more arrows within a certain amount of area... am i right or wrong?

2007-03-11 18:15:11 · 3 answers · asked by paulinatran10 1

Points A and B are separated apart by 3 m. Point A has a charge of 2 C, and B has a charge of 3 C. Point C is located somewhere in between points A and B so that the force on C is zero. How far away from point A is point C?

2007-03-11 18:06:09 · 3 answers · asked by paulinatran10 1

If a block with a mass of 10kg moves down an inclined plane (inclination is 30 degrees above the horizontal) with a constant velocity (i.e., no acceleration), what is the coefficient of kinetic friction? If the block moves a distance of 1 meter along the slope, what is the work on the block due to friction?

2007-03-11 18:00:54 · 2 answers · asked by ellyvstheworld 1

2007-03-11 17:59:39 · 4 answers · asked by hermione 1

2007-03-11 17:53:45 · 8 answers · asked by mike j 1

U are on a tall bridge, 46.0 m above the ground. A car, whose hood is 1.00 m high, is moving down the street toward the bridge. At
the moment you see the car, the vehicle has velocity V1c= 20.0 m/s and constant acceleration Ac= 1.6 m/s^2. At the moment, you throw the egg upward with the speed of |V1e| = 5.00 m/s. The egg lands on the front edge of the hood. Assume the egg is in one-dimensional vertical free fall.

b.) what was the distance D of the car from the bridge at the moment u threw the egg?
c.) what will be the velocity of the car when the egg lands on the hood?
d) what is the average velocity.
e.) what is the avg. velocty of the car?

i solved part a. and i have an idea how to do part b but i need help on the rest. Any hints is appreciated, thanks.

2007-03-11 17:50:20 · 3 answers · asked by biscuits 2

why?

2007-03-11 17:47:39 · 3 answers · asked by Daniel 1

I know the first four 1D,2D,3D,time, can someone explain to me in LAMENS terms how more dimensions are possible?

2007-03-11 17:44:47 · 4 answers · asked by Joe B. 1

Force diagrams, acceleration, Newton's laws, coefficients of friction, etc.

2007-03-11 17:43:33 · 1 answers · asked by Anonymous

How do i find the current through, and voltage across hte resisters in a circuit when looking at a diagram (in simple get-the-right-answer terms, im not good at physics)

2007-03-11 17:30:16 · 3 answers · asked by matttt 1

i wanted the design to be somewhat like this:

http://www.soinc.org/events/wheeledveh/2006/images/P5200015.jpg

what is that rod made out of?

2007-03-11 17:25:25 · 2 answers · asked by Anonymous

if the amplitude is 3 cm, how do you get theta?

2007-03-11 17:18:32 · 1 answers · asked by isuckatphysics 2

How much work is done by the gas if it's volume expands by 1.6 m^3?
please show me how to do this calculation, thanks

2007-03-11 17:16:54 · 1 answers · asked by Anonymous

A thin, uniform rod is bent into a square of side length a.

If the total mass is m, find the moment of inertia about an axis through the center and perpendicular to the plane of the square. Use the parallel-axis theorem.

Thanks for any help!

2007-03-11 17:08:57 · 2 answers · asked by Amanda 2

A 0.10 kg piece of copper at an initial temp of 95 deg C is dropped into 0.20kg of water contained in a 0.28 kg aluminum caloimeter. The water and calorimeter are initially at 15 deg C. What is the final temp of the system when it reaches equilibrium?
(cp of Copper= 387J/kg x deg C; cp of Aluminum=899J/kg x deg C; cp of Water=4186J/kg x deg C)

I'm totally not getting this!

2007-03-11 17:04:39 · 2 answers · asked by Anonymous

Changing Mass. A railroad hopper car filled with sand is rolling with an initial speed of 15.0 m/s on straight, horizontal tracks. You can ignore frictional forces on the railroad car. The total mass of the car plus sand is 85,000 kg. The hopper door is not fully closed so sand leaks out the bottom. After 20 minutes, 13,000 kg of sand has leaked out.

Then what is the speed of the railroad car?

2007-03-11 16:41:52 · 3 answers · asked by dimachevelle 2

relate it by other way in scienctific ... besides density tnx

2007-03-11 16:31:24 · 5 answers · asked by benjamincrystal 1

A 70-kg astronaut floating in space in a 110-kg MMU (manned maneuvering unit) experiences an acceleration of 0.029m/s^2 when he fires one of the MMU's thrusters.

If the speed of the escaping N_2 gas relative to the astronaut is 490 m/s, how much gas is used by the thruster in 5.0 s?

What is the thrust of the thruster?

2007-03-11 16:19:17 · 1 answers · asked by dimachevelle 2

A runner of mass m runs around the edge of a horizontal turntable mounted on a vertical, frictionless axis through its center. The runner's velocity relative to the earth has magnitude v. The turntable is rotating in the opposite direction with an angular velocity of magnitude omega relative to the earth. The radius of the turntable is r, and its moment of inertia about the axis of rotation is I.

Find the final angular velocity of the system if the runner comes to rest relative to the turntable. (You can treat the runner as a particle.)

Thanks for any help!

2007-03-11 15:45:27 · 2 answers · asked by Amanda 2

1. Two boats are anchored 4 m apart. They bob up and down every 3 s, but when one is up, the other is down. There are never any wave crests between the boats. Calculate the velocity of the waves.

2. A standing wave in a clothesline has 4 nodes and 3 antinodes. The clothesline is 12 m long and is vibrating at 0.50 vibrations per second. What is the speed of the wave?

3. A sound wave travels from A to B in the diagram below.
A ------------------------> B
In which directions do the particles of the medium vibrate?
a. up/down
b. left/right

My teacher did not teach us ANY of these concepts, except the ultilization of v=(wavelength)(frequency). I do not know what a node or antinode is, and the other two problems confuse me. Thank you for your help!

2007-03-11 15:41:22 · 1 answers · asked by Anonymous

why do cans explode in the freezer but not ina cooler with ice???yes i know the liquid expands and the can explodes in freezer but y not in cooler?thank you, i will look foward to have some good answers by after school tomorrow:)

2007-03-11 15:38:48 · 10 answers · asked by Anonymous

A car travels from town A to town B, a distance of 600km, in x hours. A plane, travelling 220km/h faster than the car, takes five and a half hours less to cover the same distance. Find the actual average speed of each of them.

2007-03-11 15:18:37 · 2 answers · asked by wheehahathotmail 1

2007-03-11 15:00:26 · 2 answers · asked by Charles T 1

I have researched on the application of this term in optics yet I'm still confused. Can anyone give a simple explanation as to what this is?

2007-03-11 14:52:11 · 2 answers · asked by mike_vik16 2

2007-03-11 14:38:02 · 3 answers · asked by Anonymous

A cart in a collision experiment weighs 800.8g. The impulse imparted to the cart is .69515Ns.

The cart bounces off a spring at the end of the track. Assuming a perfectly elastic collision, what is your best estimate of the speed of the cart before the collision?

What is the speed of the cart after the collision?

2007-03-11 14:31:33 · 1 answers · asked by sprintdawg007 3