Physics - March 2007

A block of mass m is placed in a smooth-bored spring gun at the bottom of the incline so that it compresses the spring by an amount x_c. The spring has spring constant k. The incline makes an angle (theta) with the horizontal and the coefficient of kinetic friction between the block and the incline is mu. The block is released, exits the muzzle of the gun, and slides up an incline a total distance L.

Find L, the distance traveled along the incline by the block after it exits the gun. Ignore friction when the block is inside the gun. Also, assume that the uncompressed spring is just at the top of the gun (i.e., the block moves a distance x_c while inside of the gun). Use for the magnitude of acceleration due to gravity.
Express the distance L in terms of x_c, k, m, g, mu, and (theta).

2007-03-20 11:27:45 · 5 answers · asked by ♡♥EM♡♥ 4

2007-03-20 11:26:00 · 2 answers · asked by JAMES 4

I need to know so please help me

2007-03-20 11:02:07 · 6 answers · asked by jordan 1

The temperature very high in the Earth's atmosphere can be 700 degrees Celsius. Yet an animal there would freeze to death rather than roast. Explain.


Help please!

2007-03-20 11:01:10 · 4 answers · asked by Megan M 2

If you're sitting in the back of a plane that is traveling the speed of sound, and you getup and walk to the front, are you moving faster than the speed of sound?

2007-03-20 10:53:55 · 4 answers · asked by Anonymous

all 90,180,270, and 360 degree rotations go counter clockwise...why?

2007-03-20 10:53:34 · 5 answers · asked by ASK ME 2

A wave with more amplitude has more ______ than a wave with low amplitude. Can anyone answer this?

2007-03-20 10:41:04 · 10 answers · asked by funnymonkeydance 1

would you theoretically be able to view (with a huge telescope) yourself in the past?

2007-03-20 10:38:10 · 12 answers · asked by Anonymous

A particle lives for a short time before breaking apart into other particles. Suppose it is moving at a speed of 0.984c, and an observer who is stationary in a laboratory measures the particle's lifetime to be 2.50 10-8 s.

(a) What is the lifetime according to a hypothetical person who is riding along with the particle?

(b) According to this hypothetical person, how far does the laboratory move before the particle breaks apart?

2007-03-20 10:21:22 · 1 answers · asked by christian m 2

3 point charges are located on the corners of an equilateral triangle. the sides of which being 25 cm in length. the charges are 4.50 x 10^-6 C, 2.50 x 10^-6 C, and -4.00 x 10^-6 C. calculate net electrostatic charge on the 2.50 x 10^-6 C charge.

2007-03-20 10:08:09 · 2 answers · asked by avemaria 2

a truck weighing 80000 poundsw collides with a car/suv weighing 5000 pounds at 35mph? At 65mph?

2007-03-20 10:06:22 · 3 answers · asked by HULK RULES!! 7

i kno what is it, but i do not know how to write it
can someone give my an example please....i need an example with 8 electrons or more

2007-03-20 10:02:44 · 3 answers · asked by Anonymous

2007-03-20 09:41:10 · 1 answers · asked by Loved By Someone Above 4

2007-03-20 09:29:47 · 5 answers · asked by kmm4864990 1

I would think salt and water to help rust but stuff that sinks in the ocean stays "undecayed" for decades.....

2007-03-20 09:25:33 · 2 answers · asked by Anonymous

im ok in knowing that the bigbang contraction theory, as far as a 'single' universe applies, could it be theres an infinite amount(not that infinite is an amount haha) of universies, some contracting some expanding ......and what will happen to the matter of our universe if it doesen't, and it seems it wont, slow down, could it be if the other universes or some of them spiral (as galaxies then the contracting ones could attract our matter,to use an analogy, the infinite state of universies perculate themselfs like a very thoughtful infinite brain

2007-03-20 09:16:43 · 4 answers · asked by David J 1

An engineer is designing a spring to be placed at the bottom of an elevator shaft. If the elevator cable should happen to break at a height h above the top of the spring calculate the value that the spring constant k should have so that passengers undergo an acceleration of no more than 5.0g(5*9.8) when brought to rest. Let M be the total mass of the elevator and passengers.
______________________________________________
The answer behind the book is:
12Mg/h
I'm really stuck. I have over 2 hours with this problem. PLEASE help. THx in advance.

2007-03-20 09:12:19 · 3 answers · asked by Anonymous

I know the total amount of energy in the universe is constant, but why isn't the total amount of force constant. I know those with superior intellects will probably not understand this question, but my mind can not understand for the life of me the concept of force.

For one thing how can a stationary object exert a force?

Also:

if for every action there is an equal an opposite reaction, does this mean net force in the universe is always zero?

Thanks a lot to the altruistic physics minds that help a lesser mortal such as myself.

2007-03-20 09:10:25 · 2 answers · asked by kmm4864990 1

2007-03-20 08:35:36 · 10 answers · asked by drammogan 1

2007-03-20 08:35:24 · 6 answers · asked by satouqi 3

The Persian calendar system is the most accurate one, as far as I know NASA needs very very very exact calculations so are they using Persian calendar?

2007-03-20 08:12:48 · 2 answers · asked by Anonymous

You see i am confused in this case because I know that within any situation in which an object accelerates from a stop to a velocity, a force must have acted upon it.

At the same time though, The cue ball is in fact being decelerated by the friction of the felt table when it first collides with the 8ball. So how can the cue ball exert a forward force on the 8ball if the cue ball has no forward force itself?

I absolutely realize that what occurs is a transfer of momentum and that momentum is always conserved. But I still don't understand if a force is exerted by the cue ball. If no force is exerted, how can one rectify this position since the 8 ball accelerates from stationary to having the velocity that the cue approached it with. Does anyone else agree that this is a fair question?

2007-03-20 08:08:29 · 10 answers · asked by kmm4864990 1

horizontal axis. Initially, the line joining the support point and center is horizontal.

http://www.webassign.net/tipler/9-49.gif

(a) If the ring is released from rest, what is its maximum angular velocity?
rad/s
(b) What minimum initial angular velocity must it be given if it is to rotate a full 360°?
rad/s

2007-03-20 08:03:18 · 1 answers · asked by Anonymous

A constant external torque of +52 Nm is applied to the wheel for 22 s, giving the wheel an angular velocity of +530 rev/min. The external torque is then removed, and the wheel comes to rest 120 s later. (Include the sign in your answers.)

(a) Find the moment of inertia of the wheel.
kg x m^2
(b) Find the frictional torque, which is assumed to be constant.
N x m

2007-03-20 08:01:48 · 2 answers · asked by Anonymous

????????? DEFINE IT PLEASE. I CAN'T TELL THE DIFFERENCE BETWEEN PHYSICS AND SCIENCE!!!!!

2007-03-20 07:50:53 · 6 answers · asked by Lefty 3

if the constant expansion of mass, and the constant velocity of light, are linked in any way--- then how can a constant light to matter ratio exist?


Just a question....ya know!

2007-03-20 07:49:21 · 1 answers · asked by cornflakes 1

Im doing a physics project and am finding it very hard to explain why increasing pressure increases temprature as the energy of the particals surley would not change.

Can anyone help?

2007-03-20 07:44:21 · 6 answers · asked by Cutoff 2

Three blocks are in contact with each other on a frictionless surface, horizontal surface. A horizontal Force F is applied to block 1, or m1. M1 is 2.00kg,m2 is3.00kg,m3 is 4.00kg anf the Force is 18.0N.
(a)Find aceeleration of blocks
(b)find the resultant force on each of the blocks
(c)the magnitudes of the contact force between the blocks

Any help would be great I am in the military and had reserve duty so I miss a few classes and need to get caught up

2007-03-20 07:36:53 · 2 answers · asked by Anonymous

2007-03-20 07:32:38 · 1 answers · asked by cornflakes 1

-sorry 'bout that!-


if e=mc x mc then how can a space time ratio exist, i mean you have to keep in mind that the closer you get to the speed of light-ect... but if the speed of light is constant, and the speed of thought fluctuates, then... well you get the picture!!!

2007-03-20 07:20:19 · 5 answers · asked by cornflakes 1