Physics - September 2007

A rectangular plate has a length of (21.8 ± 0.2) cm and a width of (9.2 ± 0.1) cm. Calculate the area of the plate, including its uncertainty.

So far I got 200.6 ± ?? sq. cm

I'm just not sure how to find the uncertainty.

2007-09-05 13:37:14 · 2 answers · asked by Anonymous

Which had the greater displacement, the player or the ball?

2007-09-05 13:36:30 · 1 answers · asked by J L 2

2007-09-05 13:32:06 · 1 answers · asked by mermer r 1

okay so my school is retarded and they're still changing schedules 2 weeks into the new school year ): .....they switched me out of chemistry honors and put me into physics honors.....as of right now i am completely lost in that class....becuase i missed most if not all of chapter 1.....i kind of understand the formulas.... from chapter1 that talk about velosity and so on.....but now we've moved on to chapter 2 which talks about vectors and stuff...and i'm scared that it will only get harder...i've tried getting out but....my consulor told there is no room in my schedule.....will it get easier....or only get harder....i've only been there for 3 days?....and it's not like i'm super not smart.....please any advice?

2007-09-05 13:14:18 · 7 answers · asked by iRock 1

a stone is dropped from a roof. a second stone is dropped 1.5 seconds later. how far apart are the stones when the second stone reaches a speed of 12 m/s

2007-09-05 12:53:39 · 1 answers · asked by Anonymous

Can liquid helium be stored indefinitely in a sealed container? I need to permanently seal a superconducting magnet in liquid helium. A persistent current will be induced in the superconductor and it is said that it will persist forever, theoretically. This has an immensely important application. But I just want to ensure the container won't blow up, once it's permanently sealed. Also, what material would the container be made of?

2007-09-05 12:50:15 · 4 answers · asked by Flash Gordon 4

2007-09-05 12:33:28 · 8 answers · asked by iluvunda559 1

A canoe has a velocity of 0.310 southeast relative to the earth. The canoe is on a river that is flowing at 0.560 east relative to the earth. Find the magnitude of the velocity of the canoe relative to the river.

2007-09-05 12:25:20 · 2 answers · asked by Anonymous

2007-09-05 12:20:06 · 3 answers · asked by maghadeera 2

When experimenting with pendulums, I began wondering about several things. First of all, we were required to obtain a string and make a loop 40 cm from the top tip. After 20 seconds we were to measure the number of swings, and then perform the same experiment three times for string with a length of 80 cm and 120 cm. Is it correct that as the length of the string increased, the number of swings decreased? Why is this so? Will adding more weight to the string make a noticeable difference? Dividing the average number of swings per length of string after testing 3 times by 20(seconds) produced larger numbers than when dividing the average number of swings for the shorter string. Would that not mean that the linger the string on the pendulum, the more swings? Unfortunately I could not find a source to explain this, and I would hope that certain individuals with knowledge about this experiment could shed some light. Many thanks!

2007-09-05 12:17:58 · 3 answers · asked by Quasar 2

2007-09-05 12:07:37 · 1 answers · asked by amarbains1 1

as we burn fuel ie coal,oil, are we changing the gravitational effect of the earth inrelation to other objects such as the moon

2007-09-05 11:50:53 · 4 answers · asked by CHEECH 1

A capacitor has a capacitance of 2.2 x 10^-8 F. In the charging process, electrons are removed from one plate and placed on the other plate. When the potential difference between the plates is 460 V, how many electrons have been transferred?

2007-09-05 11:40:13 · 2 answers · asked by Anonymous

What voltage is required to store 7.2 x 10^-5 C of charge on the plates of a 7.0 µF capacitor?

2007-09-05 11:38:47 · 4 answers · asked by Anonymous

Would acceleration be a curve, or a straight line?

Some info from the problem:
Object is accelerating, starting from rest
Accelerates for 4 seconds
Changes position from 2m to 10m

So, how would you find acceleration and then how would you show this on a velocity vs. time graph

Thanks!

2007-09-05 11:28:56 · 2 answers · asked by rst41 2

2007-09-05 11:18:29 · 1 answers · asked by Anonymous

What is the acceleration of a car that moves at a steady velocity of 100km/h for 100 seconds?

2007-09-05 11:08:27 · 2 answers · asked by casey c 1

2007-09-05 10:48:37 · 4 answers · asked by ndubois65 1

Its a science question need a little help as soon as possible please page is due tomorrow!! HELP!!

2007-09-05 10:30:46 · 0 answers · asked by Anonymous

A. decay of radioactive materials
B. residual heat from the formation of the earth
C. neither a nor b
D. both a and b

2007-09-05 10:30:15 · 1 answers · asked by Nicole 1

At a local bar, a customer slides an empty beer mug on the counter for an refill. The mug slides off the counter and strikes the floor 1.40 m, A) at what speed did the mug leave the counter and (B) what is the direction of the mugs velocity before it hit the floor?

2007-09-05 10:24:12 · 1 answers · asked by Anonymous

please axplain your answer

2007-09-05 10:18:11 · 5 answers · asked by Anonymous

what is its speed after 10s

what is its distance after 10s

what is its speed when it has traveled 100m

2007-09-05 10:09:43 · 2 answers · asked by Anonymous

2007-09-05 09:44:26 · 1 answers · asked by Man Who Disproves All 1

a new supermarket has opened in town 10 miles from where the browns live. the price appears to be cheaper than those of there local corner shops. help the browns decide whether it will be cheaper to shop locally or at new supermarket.

2007-09-05 09:39:10 · 1 answers · asked by beautifullfalife 1

give the x and y components, magnitudes, and directions of the following vector operations:
a + b
(x component)
(y component)
(magnitude)
° (direction from the positive x axis)

2007-09-05 09:13:00 · 1 answers · asked by tosinjesu 1

Let's say theres a light at the bottom of a bicycle wheel and we were to turn off the lights in a room and push the wheel across the room. what shape would the trajectory of the light make in one revolution of the wheel. i think it'll make kind of a flatened parabola, but im very visual and it's hard for me to imagine. My teacher only told us that the wheel has a diameter of 64 cm and the trajectory would be a specific shape but he would only tells us after we tired to figure it out, but i'm curious and i want to be a little smart *** and find it out first. If i need to clearify or add details just ask me! thanks

2007-09-05 08:54:12 · 3 answers · asked by stefany 1

Each number needs a letter! Any amount you do is fine.

1)weight
2)physical properties
3)hydrogen
4)grams per cubic centimeter
5)exothermic
6)mass
7)fourth phase of matter
8)volume
9)molecules
10)endothermic

A. amount of matter in an object
B. plasma
C. effect of gravity on mass
D. release of energy
E. particles of matter
F. absorption of energy
G. gas that is combustible
H. density
I. graduated cylinder
J. density, boiling point, solubility

2007-09-05 08:36:12 · 5 answers · asked by tia 3

hello everybody i got this problem at school that i am like half way into figuring out but i am stuck and i would realy appreciate your help
here is the problem:

A British Concorde(BC) and a French Concorde(FC) flew in opposite direction around the world, a distance of 40 000km. The BC covered half of its flight distance at a speed of 2500 km/h and the other half at a speed of 1000 km/f. The FC spent half of its flight time at 2500 km/h and the other half at 1000 km/h. Which concorde completed the trip first, and by how many hours did it beat the other?

thanks alot for any help

2007-09-05 08:36:02 · 2 answers · asked by Anonymous

Explain why the rotation of the Earth could be considered a scientific theory. Use that to help explain the motion of stars in the night sky......

2007-09-05 08:25:39 · 1 answers · asked by Lalala 2