Physics - March 2007

2007-03-21 06:36:26 · 4 answers · asked by All This and Brains Too! 2

A man wearing a bullet proof vest stands still on roller skates. the total mass is 80kg. a bullet of mass 20g is fired at 400m/s. it is stopped by the vest and falls to the ground

1.what is the velocity of the man

2.how does this compare to what you see in TV/ films

2007-03-21 06:34:35 · 1 answers · asked by Anonymous

A heavy car A, of mass 2000kg, travelling at 10m/s, has a head-on collision with a sports car, B, of mass 500kg. iF both cars stop dead on colliding, what was the velocity of B

2007-03-21 06:18:36 · 3 answers · asked by Anonymous

In a sea battle, a cannon ball of mass 30kg was fired at 200m/s from a cannon of mass 3000kg. what was the recoil velocity of the gun?

2007-03-21 06:16:31 · 2 answers · asked by Anonymous

a truck of 2 kg travels at 8m/s towards a stationary truck of mass 6kg. after colliding, the trucks link and move off together

1. what is their velocity after the collision

2. what is the kinetic energy before and after

3. where does the missing energy go

2007-03-21 06:14:52 · 3 answers · asked by Anonymous

An object (mass 10.0kg) slides upward on a slippery vertical wall. A force of 60N acts at an angle of 60 degrees. I need to find the normal force and the objects acceleration. I understand this is hard when you cannot see the diagram that is provided, but if you can just give me an explaination on how I am suppose to answer this question I will apprciate it. Thanks so much!

2007-03-21 06:12:53 · 2 answers · asked by Anonymous

I have a few questions about the book A Short History Of Nearly Everything.
In the book, there’s this example of why we cannot travel to the outer bounds of the universe…it says that, the universe bends in such a way that we cannot adequately imagine. And because if you tried to travel outward and outward in a straight line, you would never arrive at an outer boundary, but instead that you would come back to the point at which you had started.

And then they give this an analogy as a means of better understanding what was just said. The analogy says that, if for example you bring a person from a flat-surfaced universe to Earth, and if he started to roam the planet trying to find the edge of the planet, he would never get anywhere, he would just go in circles. And that in space, we have the same problem, only we’re flummoxed by a higher dimension.

2007-03-21 06:06:42 · 4 answers · asked by Jaded 7

A 800 N man on a 70 N mountain bike rides through a mud puddle on the trail. Would he make a deeper impression in the mud than a 500 N teenager driving a 4000 N ATV through the same mud puddle? Estimate the contact area of the ATV tires and the bicycle tires, then use the pressure equation to calculate the pressure in each situation.

2007-03-21 05:54:31 · 1 answers · asked by JJ99 1

Warp Speed A Plus: Newtonian Relativistic Mechanics, the book, written by Gary Mike Colasuono, is truthful, unique, concise, scientific, and original, and also takes the form of a congressional bill after discussing speeds greater than what earth observes the speed of light to be and does this scientifically.
the test.:
If the speed of light as measured by an atomic clock on the surface of the planet mercury measures a 4.3m/s increase in the speed of light nearest the sun (fastest part of mercury's orbit in its ellipse) and measures 1.0m/s increase in the speed of light farthest from the sun (slowest part of mercury's orbit in its ellipse)., than Warp Speed A Plus: Newtonian Relativistic Mechanics is essentially correct. .... .

2007-03-21 05:54:11 · 1 answers · asked by Martha H 1

I am doing a science experiment and was just wondering if my results were correct.

2007-03-21 05:51:12 · 3 answers · asked by brianrechkemmer 1

these are the choices I have to chose from
127o
106o
53o
27o

this is the second part
In the question above, what is the angle between the incident ray and the reflected ray?
127o
106o
53o
27

2007-03-21 05:30:37 · 4 answers · asked by Sesily E 1

A molecule consists of two atoms. The atoms have masses of 21 u and 17 u and are 1.63 10-10 m apart. How far from the first atom is the center of mass of the molecule?

-----------m

2007-03-21 05:24:27 · 2 answers · asked by Foxx 1

What would a free-body diagram look like of the net and normal forces (actually all the forces) on a horizontal loop of a roller coaster which is perfectly parallel to the ground. I think the normal force is pointing directly to the inside of the circle and the force of gravity (mg) is pointing directly down to the ground, which would make the normal force at a right angle or perpendicular to the gravitational force. What would be the equation for Fnet then?

Thank you for your help!

2007-03-21 05:10:59 · 1 answers · asked by pawnee_lakota 1

what will be the maximum stretch of the line at the instant he comes to rest, assuming it remains Hookean.

2007-03-21 04:56:58 · 3 answers · asked by t c 1

2007-03-21 04:52:56 · 2 answers · asked by milliepoo 1

I knoe the cost per therm of gas which is needed to heat the water. 1) form x to y degree, and 2) from x to boil for staem. The volume of water heated is different, it could be 500 gallons, or less or more. The temps normally is 75 to 180, and 75 to staem. Please provide the method of how this is done for future calcs.

Thanks

2007-03-21 04:46:48 · 6 answers · asked by A K 1

I knoe the cost per therm of gas which is needed to heat the water. 1) form x to y degree, and 2) from x to boil for staem. The volume of water heated is different, it could be 500 gallons, or less or more. The temps normally is 75 to 180, and 75 to staem. Please provide the method of how this is done for future calcs.

Thanks

2007-03-21 04:46:21 · 1 answers · asked by A K 1

I knoe the cost per therm of gas which is needed to heat the water. 1) form x to y degree, and 2) from x to boil for staem. The volume of water heated is different, it could be 500 gallons, or less or more. The temps normally is 75 to 180, and 75 to staem. Please provide the method of how this is done for future calcs.

Thanks

2007-03-21 04:45:45 · 4 answers · asked by A K 1

Find the voltage drop across every resistor. Show your work

R1 =1
R2 = 3
R3 =5
R4 =1
R5 =7
R6 =2
R7 =4


---R5----R6----
I
---R2----(R3 and R4 in parallel)----
I
---R1---10V----R7----

This is the diagram of the circuit, I drew it as clear as possible I could. R5 and R6 is in series and below, R2 is in series with R3 and R4 that are in parallel, and below there are R1, Voltage, and R7 in series. Both left and right ends are connected vertically but I only drew on left side in thediagram. Hope you get the picture.. Thank you for your help!

2007-03-21 04:31:45 · 3 answers · asked by Anonymous

2007-03-21 04:07:16 · 7 answers · asked by Joe S 1

People say that our future engery sourse may depend on the succes of nuclear fusion experiment.When these experiments can be use in the real world.

2007-03-21 04:07:10 · 2 answers · asked by brother3 4

Show that the magnetic dipole moment (M) of an electron orbiting the proton nucleus of a hydrogen atom is related to the orbital angular momentum (L) of the electron by:

M= (e/(2m))(L)

thank you so much in advance!

2007-03-21 03:17:48 · 2 answers · asked by Billie 1

2007-03-21 03:09:16 · 3 answers · asked by socrplyr 1

2007-03-21 03:04:01 · 2 answers · asked by AsiH 3

When i draw current through a load from my DC battery, a voltmeter shows a drop across the battery terminals when compared to a 'no load' condition. The more the current drawn, the greater the voltage drop. why is this?

2007-03-21 02:56:26 · 4 answers · asked by aswan k 1

Isn't the convention of stating that is "coefficient of restitution"?

2007-03-21 02:55:58 · 1 answers · asked by Anonymous

In addition if you are familiar with the personage of Richard Feynman, how do you think he would teach the new electron precluded theory based on your experience with the famous Feynman lectures of the 60's called "Six Easy Pieces".

2007-03-21 02:53:41 · 1 answers · asked by andrew l 1

If I am on a train travelling at 1000kph and I shoot a gun having a bullet speed of 1000kph out the window in a direction directly opposite to that which the train is travelling, would the bullet simply fall to the ground theoretically speaking? Please refrain from discussing issues of wind ripping my arm off etc.

2007-03-21 02:29:39 · 22 answers · asked by cormelmat 3

What wil happen when any electron of an atom starts revolving in a opposite direction then its original direction?

2007-03-21 02:23:28 · 12 answers · asked by rajesh bhowmick 2

2007-03-21 02:07:21 · 3 answers · asked by Anonymous