Physics - December 2006

2006-12-11 14:30:19 · 14 answers · asked by andrew a 1

2006-12-11 14:30:18 · 9 answers · asked by bhangraking777 1

Say you are Christams shopping and bought shoes and a hat. If you want to see you whole self in a verticle full length mirror, is there a minimum size you need and a specific height you hang it? Or, does any size work depending upon how close you stand?

2006-12-11 13:58:05 · 1 answers · asked by traxx10 2

I am into gravity. I want to know how the opposite force of gravity manifests itself.

2006-12-11 13:40:47 · 7 answers · asked by edfinite2005 2

Whats your thought. Just jump in there I really dont know.
thank you.

2006-12-11 13:39:47 · 7 answers · asked by Anonymous

20 cm of a stick are to the left of a fulcrum and 60 cm of the stick are to the right of the fulcrum. The stick is balnced by the hanging of two identical balls. One ball is at the end of the 20 cm to the left of the fulcrum, and the other ball is 10 cm to the right of the fulcrum. What is the ratio of the weight of the stick: weight of one ball.

2006-12-11 13:35:35 · 1 answers · asked by Justin F 1

I have a test tommorow over energy, work, and power, and was wondering if you could tell me if what have below is correct and maybe give me any more tips or information??

Energy- ability to do work
Work- must make something move to do work
W=Fd
Measured in Joules
Kinectic Energy- energy of motion
KE=.5mv^2
Measured in Joules
Potential Energy- Energy of position
PE=mgh
Measured in Joules
Power- rate at which work is done
P=W/t
measured in watts

Law of conservation of energy- energy can't be created nor destroyed in closed isolated system
Work-energy Theorem- work applied to object will equal change in energy of object (Still a little confused on this)

What happens to energies in closed isolated sstem?

Be able to calculate work done when force applied isn't exactly in direction of motion (Confused)

also is a kilowatt a watt with kilo (as in times by 1000?)

Thanks so Much

2006-12-11 13:32:35 · 3 answers · asked by Anonymous

If not why not?

2006-12-11 13:20:17 · 13 answers · asked by Anonymous

What is the effect of the force of gravity on an object thrown upward?

2006-12-11 13:14:26 · 9 answers · asked by Fatima 1

Do equations for accelerated motion apply to freely falling bodies?

2006-12-11 13:13:53 · 3 answers · asked by Fatima 1

2006-12-11 13:11:14 · 3 answers · asked by satvik 1

2006-12-11 13:09:01 · 8 answers · asked by james G 1

2006-12-11 13:07:32 · 5 answers · asked by james G 1

Can anyone answer this? A spacecraft in outer space increases its velocity by firing its rockets. How can hot gases escaping from its rocket engine change the velocity of the craft when there is nothing in space for the gases to push against?

2006-12-11 13:00:56 · 5 answers · asked by Shygirl 2

2006-12-11 12:44:48 · 4 answers · asked by laya 1

2006-12-11 12:37:05 · 9 answers · asked by sparky111 1

Here is the problem.

A man is driving a car, hits a pedestrian, and then applies the brakes. The skid mark left on the road is 280 ft long, and the coefficiant of kinetic friction is .30. How fast was the man going before applying the brakes.

I know the answer to this problem is 50 mph according to the back of the book, but i dont know how to get to the answer

2006-12-11 12:27:27 · 5 answers · asked by mcgee8144 2

for extra credit in my science class we can do research on an atom....any one we want
and wat atom is an interesting one to do it on....but i want it to be kinda easy

2006-12-11 12:22:23 · 5 answers · asked by Anonymous

Ok my hypothesis is this: I assume that in the situation of a fire erupting, the most suitable liquid to use to extinguish the fire would be water. What could be corrected, and how can i make it longer and more professional, BTW i'm in 9nth grade high school....

2006-12-11 12:18:40 · 3 answers · asked by Fritz J 3

i need to use a formula

2006-12-11 12:15:20 · 3 answers · asked by Sid R 2

4.60×10^23 nitrogen molecules collide with a 14.0 cm^2 wall each second. Assume that the molecules all travel with a speed of 410 m/s and strike the wall head on.
What is the pressure on the wall? In Pa

2006-12-11 12:12:52 · 1 answers · asked by physicsmed22 1

During Alpha decay, an alpha particle is emitted from a nucleus at v velocity. Explain why the velocity of the alpha particle is greater if the daughter nucleus is not free to move.

If conservation of momentum is applied, the initial momentum is 0 and the final must be zero, but because only the alpha particle has momentum, it has no other "momentum" to counter it to total zero. I can't get it to work out so the alpha particle moves faster if the daughter nucleus cannot move. Please help.

2006-12-11 12:12:36 · 1 answers · asked by JohnnyWash1 2

From what height ( in meters) must an oxygen molecule fall in a vacuum so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 300 K?

2006-12-11 12:08:03 · 1 answers · asked by physicsmed22 1

.....left become right and right becomes left. So why isn't the top and bottom reversed as well?

2006-12-11 12:05:46 · 4 answers · asked by Up your Maslow 4

Could this be the cause of the magnetic effects in the Bermuda triangle? Even though it takes thousands of years to complete couldthis be one of the starting places?

2006-12-11 12:05:21 · 2 answers · asked by ChaliQ 4

A lottery machine uses blowing air to keep 2000 Ping-Pong balls bouncing around inside a 1.0m x 1.0m x 1.0m box. The diameter of a Ping-Pong ball is 3.0 cm. What is the mean free path between collisions?
Give your answer in cm.

2006-12-11 11:57:11 · 2 answers · asked by MattS 1

A 60 g ball is tied to the end of a 50-cm-long string and swung in a vertical circle. The center of the circle is 150 cm above the floor. The ball is swung at the minimum speed necessary to make it over the top without the string going slack.
If the string is released at the instant the ball is at the top of the loop, where does the ball hit the ground?

2006-12-11 11:48:46 · 2 answers · asked by MattS 1

which color of light has the greatest energy? why? plz be simple. im in eighth grade.

2006-12-11 11:46:27 · 7 answers · asked by swtbabe2000 2

A 100 kg basketball player can leap straight up in the air to a height of 80 cm. You can understand how by analyzing the situation as follows: The player starts solid on the ground, with his knees bend ready to jump. THe instant he leaves the ground his head has moved vertically 60 cm, but remember his knees were bent to begin with. The max height from his feet to the ground is 80 cm
With what speed must the player leave the ground to reach a height of 80 cm?
m/s

What was his acceleration, assumed to be constant, as he jumped?

2006-12-11 11:36:33 · 3 answers · asked by MattS 1

Four 9.0 kg spheres are located at the corners of a square of side 0.64 m. Calculate the magnitude and direction of the total gravitational force exerted on one sphere by the other three.

2006-12-11 11:36:01 · 1 answers · asked by Anonymous