Physics - November 2007

2007-11-18 18:26:04 · 3 answers · asked by Anonymous

How is it possible that if u exceed light speed you go back in time? Like In The 1800s we may have said if we exceed mach 5 we would find ourself back in time. Einstein clearly was a genius But im finding it hard to believe that part.A theory that i beleive in is hyperspace.If u exceed the speed of light you enter into hyperspace

2007-11-18 18:11:02 · 6 answers · asked by youngfranchi 2

equilibrium

2007-11-18 17:43:03 · 9 answers · asked by dgIII 1

2007-11-18 17:07:37 · 1 answers · asked by epa51starnet 1

Hint: Consider the wheel's energy. Consider a wheel of radius 1:15 m, mass 8:7 kg and moment of inertia I = (MR^2)/2 (it's a solid disk). The wheel rolls without slipping in a straight line in an uphill direction 17 degree above the horizontal. The wheel
starts at angular speed 18:3 rad/s but the rotation slows down as the wheel rolls uphill, and eventually the wheel comes to a stop and rolls back downhill. The acceleration of gravity is 9:8 m/s^2. How far does the wheel roll in the uphill direction before it stops? Answer in units of m

2007-11-18 15:21:46 · 3 answers · asked by Captain Jack is Back 1

experss this speed in meters per second?
what is this speed in miles per hour
what is this speed in light year per year

can you please show the solutions thanks

2007-11-18 14:54:21 · 2 answers · asked by Anonymous

A spring has a force constant of 4000 n/m. The spring is initially streched by 2 CM beyond its equilibrium config. Then the spring is compressed until its length is 6 cm less than the relaxed length. What is the net ammount of work done by the spring AND the person moving the spring?

2007-11-18 14:52:19 · 1 answers · asked by Anonymous

express this speed in meters per second. fathom is precisely 6 ft
what is this speed in miles per hour?
what is this speed in light year per year?

2007-11-18 14:39:41 · 1 answers · asked by tobi 1

A pendulum clock has a period of 0.690 s on Earth. It is taken to another planet and found to have a period of 0.802 s. The change in the pendulum's length is negligible.

Find the gravitational field strength on the other planet.
____m/s2


I already know that the gravitational strength on the other planet is going to be less than that on earth but i cant figure out what the strength is. Thanx for the help!

2007-11-18 14:29:30 · 1 answers · asked by Anonymous

I don't want you to answer the question, just help me!
1. The speed of light is 3 x 10(to the) 8 (th power~ scientific notation) meters/sec. How long does it take light to travel the 149 x 10 (to the) 9 (th power) meters distance from the sun to the earth?

2. A driver starts his parked car and within 5 seconds reaches a velocity of 54 km/hr as he travels east. What is the acceleration?

thanx!

2007-11-18 14:21:41 · 5 answers · asked by Anonymous

how do u use the center of gravity approach to Determine the optimal location (latitude and longitude) to minimize driving distance per week given constraints.

2007-11-18 14:03:44 · 1 answers · asked by Na la 3

(since the Earth is fatter at the equator than at the poles) Explain how the Mississippi can flow "uphill". I have no idea how to answer this problem, please help if you can! Thank you!

2007-11-18 13:56:25 · 3 answers · asked by Kiwikahuna 2

The standard heat of formation of CaBr2 is -675 KJ/mol. The first ionization energy of Ca is 590KJ/Mol and its second ionization energy is 1145KJ/Mol. The heat of sublimation of Ca[Ca(s)---->Ca(g)] is 178 KJ/Mol. The bond energy of Br2(l) is 31 Kj/Mol, and the electron affinity of Br is -325 Kj/Mol.

Calculate the lattice energy of CaBr2??

E=? kj/mol

2007-11-18 13:31:02 · 2 answers · asked by FANTASY 2

A 7500kg truck traveling at 5 m/s east collides with a 1500kg car moving at 20 m/s direction south of west. After the collision, the two vehicles remain tangled together. A) With what speed and direction does the entangled wreckage move immediately after the collision? B) If the coefficient of friction between the sliding wreckage and the road is .85, how far will the wreckage go before it slides to a stop?

I got:
A) (7500kg)*(5m/s) + (1500kg)*(20m/s) = )7500kg+1500kg)V
V= 7.5 m/s
is that right?

2007-11-18 13:28:36 · 1 answers · asked by Anonymous

can someone explain to me what the higgs boson is? i read something about it being the reason particles have mass, would that be true?

2007-11-18 13:26:50 · 2 answers · asked by Anonymous

Imagine you are lost in the wilderness and need a campfire to cook your food. Would it be better to have a convex or concave mirror to start a fire using sunlight? Where would you position the mirror relative to some dry leaves in order that they would catch fire?

2007-11-18 13:07:10 · 1 answers · asked by Anonymous

float it in a glass bowl full of water. The needle is align itself with the horizontal component of the Earth's magnetic field. Since the north pole of this compass is attracted northward, will the needle float toward the north side of the bowl? Defend your answer.

2007-11-18 13:03:41 · 7 answers · asked by Anonymous

I have four questions.

At least the first three are about particle physics!

Why is gravity so weak?

Are there extra space-time dimensions?

What is the nature of dark matter?

What is propelling the universe to spread so quickly?

I don't believe a "big bang" explains it. Do you???

2007-11-18 13:00:10 · 2 answers · asked by Anonymous

but not always in a magnetic field. Do you agree? Why or why not?

2007-11-18 12:57:25 · 1 answers · asked by nancy c 1

A pot with 50 kg of water is on the stove at an initial temperature of 25C. When the burner is turned on, 800KJ are transferred to the water but 100kJ are transferred from the water to the surroundings. What is the change in internal energy of the water?

2007-11-18 12:56:04 · 1 answers · asked by Chris 2

..the ring may be hot to your touch. Why?

2007-11-18 12:55:45 · 1 answers · asked by nancy c 1

2007-11-18 12:55:11 · 1 answers · asked by Anonymous

I need to know this for 8th grade physics - also, what are ways to find out when you are given limited information?

2007-11-18 12:52:29 · 1 answers · asked by piano man 1

aln elctron is moving 5x10^6 m/s parallel to a 1mm diameter wire carrying a current of 20 A. If the elctron is 2 mm from the center of the wire, w/ its velocity in the same direction as the current. what is the force that the electron experiences?

i know that F= qVB

and B= (U I) / (2 pi r)

but i duno....plz help

2007-11-18 12:42:36 · 1 answers · asked by Anonymous

An astronaut in a rocket moving at 0.4c toward the Sun finds himself halfway between Earth and the Sun. According to the astronaut, how far is he from Earth? In the frame of the Sun, the distance from Earth to the Sun is 1.5 1011 m.

2007-11-18 12:03:04 · 1 answers · asked by Anonymous

What must the separation be between a 6.2 kg particle and a 1.1 kg particle in order for their gravitational attraction to be 2.7*10^-12 N?

if you set the problem up, i should be able to finsih it and get the answer.

thank you so much!!!

2007-11-18 11:48:22 · 1 answers · asked by Elizabeth 3

Elastic potential energy is the potential energy in an object because it has been stretched or compressed. I'm pretty sure the answer is no but I haven't been able to find anything to back me up on the internet. Help me out plz!

2007-11-18 11:43:28 · 2 answers · asked by Anonymous

2007-11-18 11:40:30 · 3 answers · asked by Anonymous

an object of mass m is moving with speed v0 to the right on a horizontal frictionless surface. it explodes into two peices.

one piece with mass (20/23)m moves to the left at velocity v0/5. second piece with mass (3/23)m moves to the right at what velocity?

2007-11-18 11:34:42 · 1 answers · asked by Joanna H 1

Please help me...Im hopeless with physics

2007-11-18 11:34:14 · 2 answers · asked by XAIPE 1