Physics - March 2007

2007-03-12 13:39:22 · 5 answers · asked by ^MomentaryInsanity^ 3

any differences between them.

2007-03-12 13:14:55 · 3 answers · asked by Diarra B.K.A Sexiiladii*~*~1 1

I don't get it. How come I will have two answer for each problem?

A 5 kg body moving in the +X directionat 5.5 m/s collides head-on with a 3.4 kg body moving in the -X direction at 4 m/s. Find the final velocity of each mass for each of the following situations. (Take the positive direction to be +X.)

(a) The bodies stick together.
m/s (5 kg mass)
m/s (3.4 kg mass)


(B) the collision is elastic
m/s (5 kg mass)
m/s (3.4 kg mass)

(c) the 5.0 kg body is at rest after the collision
m/s (5 kg mass)
m/s (3.4 kg mass)

(d) The 3.4 kg body is at rest after the collision.
m/s (5 kg mass)
m/s (3.4 kg mass)

(e) The 5 kg body has a velocity of 4 m/s in the -X direction after the collision.
m/s (5 kg mass)
m/s (3.4 kg mass)

2007-03-12 13:07:14 · 3 answers · asked by beast 1

That's why no one from the future has visited us yet.

2007-03-12 12:54:13 · 4 answers · asked by PT109 1

If you had a box made out of Mirrors and if you where able to get a very small light source to project into the box. Would it completely light up or just kinda stay the same brightness. Hope this makes sense?

2007-03-12 12:43:40 · 2 answers · asked by Ezz 6

refection, resonance, reverberation, or refraction??

2) electric field lines are drawn
a) toward the positive test charge
b) away from the positive test charge
c) in such a way as to show the direction of the field
d) radiating outward like spokes on a wheel

3) which one of the following does not have the same units as others?
a) kinetic energy
b momentum
c) potential energy
d) work

2007-03-12 12:35:49 · 2 answers · asked by Stacey lynn 2

My sister needs to know how to carry out this investigation for part of her exams.... any help? It's a physics experiment but needs to be simple

2007-03-12 12:18:57 · 9 answers · asked by Shirley R 1

Will clear, red, blue, or yellow water get the hottest under a lamp?

2007-03-12 12:03:17 · 9 answers · asked by Isabella 2

iM NOT ALLOWED TO EXCEED MORE THAN FiVE DOLLARS...HELP ME... :[

2007-03-12 11:49:04 · 2 answers · asked by EUNiCE. 1

A spaceship ferrying workers to Moon Base I takes a straight-line path from the earth
to the moon, a distance of 384,000 km. Suppose it accelerates at 20.0 m/s2 for the
first 15.0 min. of the trip, then travels at constant speed until the last 15.0 min. when
it accelerates at –20 m/s2, just coming to rest as it reaches the moon.
(a) What is the maximum speed attained?
(b) What fraction of the total distance is traveled at constant speed?
(c) What total time is required for the trip?

2007-03-12 11:45:39 · 3 answers · asked by Anonymous

Everybody knows about the argument whether mobile (cell) phones can cause brain damage or not with prolonged use. It worries me when you think of all the different signals that are floating around these days (TV, Radio, Satelite, Mobile Phone, Wi-Fi, Bluetooth just to name a few). I wonder how many signals our bodies absorb and how dangerous this could be to humans?

2007-03-12 11:44:14 · 10 answers · asked by Anonymous

And try to explain that gravity creates the observable universe. Plasma physics models in cosmology show that everything in the observable universe can be created in a lab. Hence, the misconception about gravity has created theories from the big bang to black holes and dark matter, all based upon made up bizzarre theories to make them even theoretical, let alone testable!

2007-03-12 11:29:51 · 6 answers · asked by Anonymous

2007-03-12 11:19:56 · 5 answers · asked by peterneillsr 1

(A 40 kilogram barrel is rolled up a 10 meter long ramp to a height of 5 meters.) How much does the barrel weigh?

40 Kilograms right?? or if you can see any other way to figure out this problem please explain!! thanks!

2007-03-12 11:00:38 · 13 answers · asked by xJessa Gurlx 1

ok i just need some answers but if you can explain that would be great!

1.how fast would a 4kg mass have to be going to get to a height of 20 meters?

2.a car can start from rest and accelerate to a speed of 65miles per hour. there is nothing pushing it from outside where does the energy come from?what type of potential energy did the car start with-

3.an object is in the top of a 100meter building. what are the values for kinetic energy and potential energy at the various heights if its total energy is 500joules?
at the top of the building?
1/4 way down the face of the building?
1/2 way down the face of the building?
3/4 way down the face of the building?
at the bottom right befor it hits the ground



thanks these are the only ones i dont get help

2007-03-12 11:00:31 · 2 answers · asked by Anonymous

2007-03-12 10:47:58 · 6 answers · asked by Ronnie C 1

2007-03-12 10:32:43 · 3 answers · asked by JAMES 4

A miniature spring-loaded, radio-controlled gun is mounted on an air
puck. The gun's bullet has a mass of 5.00 g, and the gun and puck have
a combined mass of 120 g. With the system initially at rest, the radio
controlled trigger releases the bullet causing the puck and empty gun
to move with a speed of 0.500 m/s. What is the bullet's speed?



F 4.80 m/s
G 11.5 m/s
H 48.0 m/s
J 12.0 m/s
K 23.0 m/s

2007-03-12 10:28:11 · 2 answers · asked by Lakers 1

No Homework. No Religion. Many Thanks!

2007-03-12 10:17:15 · 13 answers · asked by Dovey 7

When will time travel become possible? Will it be possible to travel freely to the past, or future, or will travel only be possible to the future? Could this be why no one has traveled back yet? What are the current obstacles to time travel?

2007-03-12 10:11:32 · 42 answers · asked by Packer Smacker 4

a 2200 gram mass starts from rest and slides a distance L down a frictionless 40 degree incline, where it contacts an unstressed 60 cm long spring of negligible mass. the mass slides an additional 20 cm as it is brought momentarily to rest by compressing the spring of force constant 13 n/cm. the acceleration of gravity is 9.8 m/s^2. note: the spring lies along the surface of the ramp. the ramp is frictionless. the external force is rapidly removed so that the compressed spring can push up the mass. find the initial separation L between mass and spring ?

2007-03-12 10:11:14 · 3 answers · asked by Anonymous

2007-03-12 10:06:48 · 17 answers · asked by Anonymous

First, there's a diagram of a mass on an inclined plane. Attached to the mass is a rope that runs through the pulley at the top. The plane is essentially a right triangle.

The plane has is inclined at a 30-degree angle. The coefficient of kinetic friction between the mass and the plane is 0.1. The mass is 100 kg. If the mass is moving up the inclined plane at a velocity of 2 m/s, what tension should be applied to the rope in order to make the mass reverse directions in exactly 1 s?

a. 213 N
b. 387 N
c. 613 N
d. 787 N

I don't quite understand the question so please explain your reasoning. Thank you.

2007-03-12 10:04:04 · 1 answers · asked by Philippe 3

If you want to throw a disc far, should you throw it into the wind, or with the wind behind it?

2007-03-12 09:52:30 · 4 answers · asked by Anonymous

There are three known degrees of radiation; light, radio waves and x-rays, denoted by the greek letters alpha, beta and gamma.
The fourth letter is Delta. What I'm asking is, do you think that there is another type (degree) of ultraviolent radiation that exists within earth's atmosphere that we simply haven't detected yet or simply don't have the means to? Would it be called delta radiation?

2007-03-12 09:42:51 · 6 answers · asked by Ammy 6

A mail bag with mass 120kg is suspended by a vertical rope 6.0 m long. What horizontal force is necessary to hold the bag in a position displaced sideways 3.0 m from its initial position?

so far, i have come up with the equation of F=mgsin(x) but that is wrong, no angle is in the problem.

thanks for any help!

2007-03-12 09:33:21 · 2 answers · asked by Anonymous

None of the websites tell me about it. i cant find the freakin answer! Please help me i need the answer!

2007-03-12 09:28:35 · 3 answers · asked by Han N 1

If we have 2 masses both moving towards the right along the x axis, and mass 1 (1kg) has a velocity of 4m/s and to its right is mass 2 (2kg) with a velocity of 1m/s. After the two masses collide elastically, what are their velocities afterwards? Also compute the velocity of the center of mass for both before and after the collision. (Hint they should be the same).

2007-03-12 09:27:09 · 2 answers · asked by GSU 1

If a rocket ship (mass = M) is moving along through space and it gets hit on the side by a meteor (mass=m) (meteor’s velocity is perpendicular to that of the ship’s). Which of the two following scenarios will cause the ship to be deflected off course the most? Case 1: The meteor bounces elastically off of the ship – the meteor travels back in a direction from where it came. Case 2: The meteor sticks to the ship. Use conservation of linear momentum for each case and then compare the results.

2007-03-12 09:26:47 · 2 answers · asked by GSU 1

If a bobsled with driver (combined mass =300kg) starts at the top of the track with an initial velocity of 2m/s and at the end of the run, the sled is speeding along at 30m/s. Assume the track’s friction consumes 10 percent of the total gravitational energy, what is the total vertical drop of the track?

2007-03-12 09:25:22 · 2 answers · asked by GSU 1