Physics - September 2007

A particle moving along the x axis is located at 13.3 m at 1.77 s and at 4.25 m at 3.47 s. Find its displacement during this time interval? (answer in m)

2007-09-07 16:20:36 · 5 answers · asked by Cnall 1

And people anywhere are only poor, old, sick, hungry, thirsty and die because they have inacurate beliefs about the way the world around them works and how it could work?

2007-09-07 16:14:23 · 11 answers · asked by Stan S 1

Is there a limit to how bright something (like a light source) can be? If so what is it, and why?

2007-09-07 15:17:18 · 3 answers · asked by frogster99 2

Is there ANY way that general relativity helps us people today? or like does it help NASA in any way?!
I'm desperate..i just need to know how general relativity helps us even in the littlest way.

2007-09-07 15:01:23 · 6 answers · asked by Anonymous

I was reading the idea that the universe is finite without boudnaries and expanding onto itself


but if I could HYPOTHETICALLY fly to the edge of the universe

( I'm not sure the exact shape -- I'll assume it's a sphere)

so X light years radius I drive from the center ...to the point where it's expanding at that INSTANT ...what would I see? Could I touch it ...would it not allow me to get and further out
..is it like a brick wall

If It were like a sphere....then there has to be something outside that sphere....outside of space and time ...any ideas?

2007-09-07 14:37:50 · 25 answers · asked by Anonymous

2007-09-07 14:32:24 · 3 answers · asked by Anonymous

An electric dipole consists of charges +2e and -2e separated by 0.78 nm. It is in an electric field of strength 3.4 x 10^6 N/C. Calculate the magnitude of the torque on the dipole when the dipole moment is
(a) parallel to
(b) perpendicular to
(c) antiparallel to the electric field.
What is the difference between potential energies for dipole orientations parallel and antiparallel to the electric field?

2007-09-07 14:27:30 · 2 answers · asked by Hua Zhi X 1

A metal sphere of radius R = 23 cm carries a total charge Q = 0.3 μC. What is the magnitude of the electric field (in N/C) just outside the sphere?

2007-09-07 14:10:35 · 1 answers · asked by Anonymous

Find the electric field (in N/C) at a point r =1.3 m above a point charge of magnitude Q= -43 μC. Take upwards to be positive.

2007-09-07 14:09:33 · 1 answers · asked by Anonymous

I have slightly confused with this Physics problem!.....i cannot figure out how to do it

Two vectors A and B have magnitude A=3.06 and B=3.09. Their vector product is A x B = -5.09 k + 1.91 i. What is the angle between vectors A and B?

2007-09-07 13:23:19 · 3 answers · asked by xxx 1

Let the car's initial velocity be +16.0 m/s, and the acceleration be -1.6 m/s2. What is the total distance traveled 20 s?

2007-09-07 13:11:06 · 2 answers · asked by Anonymous

MEDIUM - hard baseballs
1. What are the characteristics of this medium(i.e.density, elasticity, compressibility, and bulk modulus)?


2. What would happen to your hand on the other end of a group of baseballs after they were struck with a hammer? Did you feel more pressure when compared to the water balloons? why?


3. Is this medium good for energy propagation, prove it through supporting references.

2007-09-07 12:39:32 · 1 answers · asked by jamal12pk 1

A basketball player who is 2.00 m tall is standing on the floor L = 13.0 m from the basket, as in Figure P4.52. If he shoots the ball at a 38.0° angle with the horizontal, at what initial speed must he throw so that it goes through the hoop without striking the backboard? The basket height is 3.05 m

2007-09-07 11:32:56 · 2 answers · asked by ひいらぎ 5

2) A tennis ball with a speed of 12.6 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 10 m/s. If the ball is in contact with the wall for 0.014 s, what is the average acceleration of the ball while it is contact with the wall?
I thought the answer was 1614.29 m/s^2 but it wasn't right. Could somebody please help me!!

2007-09-07 11:24:12 · 3 answers · asked by lola 1

2007-09-07 10:40:59 · 7 answers · asked by RogerDodger 1

2007-09-07 09:34:08 · 8 answers · asked by Anonymous

Even if and only "if" it was possible I think it would take years to the possibility of doing it....What are your thoughts...
serious answers please..

2007-09-07 09:25:12 · 15 answers · asked by calm x 1

Yes, this is homework help. The question is as poses,

"What is the direction of the acceleration vector of a person on the spinning Earth if a person is (a) at the equator? (b) at some other latitude? (c) at the poles?"

2007-09-07 09:23:04 · 3 answers · asked by sugar_and_spice 2

Convert the following quantities. Be sure to show all work with units.

a) 285 cm to m

b) 0.85 kg to g

c) 42.2 in to cm (1 in=2.54 cm)


can you explain how to do these problems, not just the answers, im having trouble i dont really know how to do this, thanks

2007-09-07 09:22:50 · 3 answers · asked by Anonymous

2007-09-07 09:18:52 · 4 answers · asked by Wanda S 4

I am very lost with this question can someone please help me.:) and please explain what u do in detail because i have no idea what to do. thanks please take ur time and make sure it is correct thanks

Two students walk in the same direction along a straight path, at a constant speed-one at 0.90m/s and the other at 1.90m/s.

a. Assuming that they start at the same point and the same time, how much sooner does the faster student arrive at a destination 780m away???

b. How far would the students have to walk so that the faster student arrives 5.50min before the slower student ???

2007-09-07 09:10:49 · 6 answers · asked by bubblebee 2

I know the largest nuclear bomb ever exploded was the Tzar Bomba, that I believe was 50 megatons and could create 100 square miles or more of complete or near complete destruction. But lets say now, the USA or other superpower tried to create real strong nuke, theoritically, how strong could they make it, and how much destruction could it cause? Like for example, how large would the blast be?

I'm thinking we could make a much stronger bomb than Tzar Bomba, since it was made 50 years ago, and we must be more advanced now.

2007-09-07 09:05:11 · 6 answers · asked by THE HAMSTER 1

1) An electron, starting from rest and moving with a constant acceleration, travels 1.9 cm in 3.8 ms. What is the magnitude of this acceleration is km/s^2.
I got 5 x 10^-4 km/s^2. Is this correct????

2) A tennis ball with a speed of 12.6 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 10 m/s. If the ball is in contact with the wall for 0.014 s, what is the average acceleration of the ball while it is contact with the wall?
I got the answer 1614.29 m/s^2. Is this right???

2007-09-07 08:05:43 · 1 answers · asked by lola 1

2007-09-07 07:48:05 · 2 answers · asked by Anonymous

This question is not as stupid as it sounds: it relates to a law I half-remember in Physics, about the preservation of Energy.

2007-09-07 07:47:21 · 6 answers · asked by Anonymous

x(t) = v0/k * ( 1 - e^(-kt) ), where v0 and k are constants.

a) If k = 2, how long does it take the velocity to slow to 1/100 of its original velocity?

b) Show that the acceleration is directed opposite to the velocity and has a magnitude proportional to the speed.

Thanks in advance.

2007-09-07 07:32:46 · 3 answers · asked by MathGuy 6

why must you never just turn off the switch instead of tripping the circuit breaker or removing the fuse.

2007-09-07 07:27:39 · 2 answers · asked by princess 2

just curious!

2007-09-07 07:09:21 · 4 answers · asked by Anonymous

The first several digits of pi are known to be = 3.14159265358979....

A.)What is pi to 2 significant figures?
B.)What is pi to 9 significant figures?
C.)What is pi to 12 significant figures?

Question B: How many significant figures are there in the following two numbers?

(a) 0.00043

(b) 7.3650 10^2?

Thanks for your help! :)

2007-09-07 06:53:52 · 8 answers · asked by PaNaSoNiCeDgE 1

space ship is 300m and my speed is .86...Then I know the length observed by a stationary observer is: 153meters. However, what would the length be for the person inside the space ship and why? Would it appear longer than the 300m? And if so how do you find the exact number?

2007-09-07 06:49:42 · 4 answers · asked by shellyeliz 2