Physics - November 2007

2007-11-23 05:48:58 · 8 answers · asked by Anonymous

2007-11-23 05:27:31 · 2 answers · asked by sumit b 2

I need to build a bridge for my physics class that ways less than 2.5 grams made of tootpicks. I need ideas for bridge types and online bridge building software.

2007-11-23 04:55:47 · 2 answers · asked by samir s 1

I know that it does not depend upon the distance between the electrodes.I just want to know why it doesn't...Plz help !!!

2007-11-23 04:36:47 · 2 answers · asked by RJ 1

If there was a cube whose sides are negative number, what would this be? A black hole or something?

2007-11-23 04:34:28 · 3 answers · asked by YahooAnswers 2

For science i need to make a newtons scooter, ill put the rulles up
Must… Cannot…
Move forward by pushing back on something. Use electricity, balloons, gravity, or fluids.
Start on the floor. Rise of the ground more than a foot.
Have its propulsion device attached to the car. Be pushed to start.
Start by a simple release of the hand. Use a human or animal force.
Follow all the safety guideline discussed at the beginning of the year. Be a sling shoot.


there u go plleeeez help

2007-11-23 04:01:22 · 2 answers · asked by UMYEAHH 2

i tried everything i tried the pathagorians theorem and it didnt work. how on earth can i do this problem???

A snowball is launched horizontally from the top of a building at v = 11.4 m/s. If it lands d = 33 meters from the bottom, how high (in m) was the building?

2007-11-23 03:19:39 · 4 answers · asked by molly 1

The earth orbits the sun once a year (3.16e10^7 s) in a nearly circular orbit radius 1.50e10^11 m. With respect to the sun, determine the angular speed of the Earth in rad/s.

OK, so angular speed = change in theta/ change in time.

for theta I got 2(pi)r. Is that not right?

Help, please.

2007-11-23 02:59:00 · 3 answers · asked by frosty 2

2007-11-23 02:58:12 · 7 answers · asked by Anonymous

A projectile is launched at an angle of 35° above the horizontal with a speed 107 m/s. At the highest point in its trajectory, the vertical displacement above the ground is?

2007-11-23 02:53:02 · 4 answers · asked by molly 1

An airplane has an air speed of 126 m/s and flies due North, but the wind is to the East at 56 m/s. What is its actual ground speed (in m/s)?

2007-11-23 02:48:25 · 3 answers · asked by molly 1

The twin paradox of relativity is resolved by pointing out that there are three frames of reverence not two. The earth remains in one the whole time of the twin's ship's travels. But the space ship starts in one frame and then when it turns around it changes its frame of reference.

Refer to classic Twin Paradox at wikipedia

The standard explanation works so long as the ship turns around. What happens if the ship travels only one way and upon arriving, decelerates and again rejoins the frame of reference of the earth. Adjusting for simultaneous time with earth, the traveling twin has still aged only half the time as the twin on earth. Why is the slower time dilation assigned to the traveling twin, when the earth was speeding away from the ship as fast as the ship was speeding away from the earth.

If answering, be careful. Try not to be confused by the distance between the ship and the earth. Imagine simultaneous clocks on earth and at the ship's destination placed long ago.

2007-11-23 02:31:11 · 4 answers · asked by jerrywickey 2

Isent there too much nonsense to form a human and operate the functions

2007-11-23 02:18:00 · 4 answers · asked by Anonymous

Jean, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from Dulles Airport. She notices that the string makes an angle of 27° with respect to the vertical while the aircraft accelerates for takeoff, which takes about 20 seconds. Estimate the takeoff speed of the aircraft.

2007-11-23 02:08:28 · 3 answers · asked by swisscheese 1

the carnival ride has a 2.0m radius and rotates once of a rider.
a)find the speed of a rider.
b)find the centripetal accleration of a rider
c)what produces this accleration?
d)when the floor drops down, riders are held up by friction. draw motion and free body diagrams of the situtation
e)what coefficient of static friction is needed to keep the riders from falling?

2007-11-23 02:05:29 · 1 answers · asked by peipei91189 1

1)the carnival ride has a 2.0m radius and rotates once
each 0.90second

a)find the speed of a rider.
b)find the centripetal accleration of a rider
c)what produces this accleration?
d)when the floor drops down, riders are held up by friction. draw motion and free body up by friction. draw motion and free body diagrams of the situation
e)what coefficient of static friction is needed to keep the riders from slipping?

2007-11-23 01:51:15 · 1 answers · asked by peipei91189 1

imagine an object of mass m oscillating, through a small angle, around an axis at point A, which is located a distance D away from the object's centre of mass, cm.
T is the period of oscillation.

how am i meant to show that this object's moment of inertia through the centre of mass, and parallel to the A axis, is given by

I = (MD/4π^2)(gT^2 - 4Dπ^2)

i havent got a clue how to do this, can it be clearly explained please?

thanks.

2007-11-23 01:39:37 · 3 answers · asked by fpa06mr 5

if we are travelling at the speed of light, and we shine a torch ahead of us, will we be able to see the light??
plz give reason!

2007-11-22 23:57:18 · 26 answers · asked by addy 1

2007-11-22 20:55:32 · 4 answers · asked by sathish k 1

Earth rotates on its center axis from EAST to WEST and also again on its center axis it rotates from north to south (called constellation ) - then earth rotates in eliptical form in our very own solar system with sun as the center for that rotation and then we have our whole solar system with the sun and earth in it all together rotating around the center of our milky way Galaxy - then our galaxy is moving from the center of our Universe as how it was said to begin from the big bang - now where is that center of that Universe ?

2007-11-22 20:06:25 · 6 answers · asked by Anonymous

2007-11-22 19:54:35 · 11 answers · asked by krisha n 1

2007-11-22 19:37:47 · 3 answers · asked by Anonymous

thanks for the answer

2007-11-22 18:43:39 · 6 answers · asked by Anonymous

what is time? have you ever thought about it? how can time EXIST?

existance is majorly defined for objects. for example an apple can exist. a car can exist. an atom can exist. but what does it really mean to say time exists?

is there an outside existence?

time is related to space as a fourth demention but in reality is it even possible? a demention in the same coordinations as space? It's hard for me to see how a constant cocept such as space can be related to a constantly-chanting concept such as time.

---

What are you views on this? How do you define time? could it be just a human perception?

2007-11-22 18:37:22 · 6 answers · asked by Zeta 3

Also how a elementary particle, lets say a proton knows the existence of another proton near it so that they repel each other?

2007-11-22 17:56:39 · 8 answers · asked by Rah-the genius 2

A rectangular air mattress is 2.0 m long, 0.50 m wide, and 0.08 m thick. If it has a mass of 2.0 kg, what additional mass can it support in water?

I don't even know exactly what this question is trying to ask! Can anyone help me??????

2007-11-22 17:28:24 · 3 answers · asked by Eric S 2

Assume the solidity of the turd is approximately that of a Snickers bar.

Lethal, or not?

2007-11-22 17:12:21 · 4 answers · asked by Anonymous

lies in an xy plane. One force is F1 = (3.3 N) + (4.5 N) . Find the acceleration of the chopping block in unit-vector notation for each of the following second forces.
(a) F2 = (-3.3 N) + (-4.5 N)

2007-11-22 17:10:40 · 4 answers · asked by bigtregre 1

2007-11-22 16:46:37 · 12 answers · asked by Anonymous

Thanks for helping me people these are the questions
1) If an unbalanced force on an object is doubled, what change in acceleration is produced?
2) What is the relationship between the unbalanced force acting on an object and its acceleration?
3) If the mass of an object is doubled, but the unbalanced force acting on it remains the same, what change in the acceleration is produced?
4) What is the relationship between the mass of an object and its acceleration?
5) What is the relationship between the unbalanced force acting on an object and ma, the product of its mass and its acceleration?
6) If a 1 N force accelerates one cart a 0.5 m/s2, what acceleration will a 5 N force produce on a stack of five carts?

2007-11-22 15:26:50 · 3 answers · asked by Anonymous