Physics - March 2007

1.Calculate the velocity of a satellite moving in a stable circular orbit about the earth at a height of 3600km...
During an Apollo lunar landing mission, the command module continued to orbit the moon at an altitude of about 100km. How long did it take to go around the moon once?

2007-03-05 08:47:54 · 1 answers · asked by arsenal g 1

The Doppler Shift involves a shift in the __. List all that apply
A. the loudness of a sound observed by a listener
B. the perceived pitch of a sound observed by a listener
C. actual frequency produced by the source of sound
D. actual intensity produced by the source of sound
E. none of these

2007-03-05 08:45:06 · 7 answers · asked by "G" 1

if i jump on an open top bus then i will land further back on the bus if it is moving forward, if i am inside the bus and do the same will i land in the same position as i jumped from or will i land further back on the bus?

2007-03-05 08:33:32 · 10 answers · asked by Jesusreloaded 2

9 ev
12 ev
3ev
27ev
please tell me how u got the answered

2007-03-05 08:25:00 · 2 answers · asked by Anonymous

An atom with a neutral charge has the same number of ____________ and _________.

protons, electrons, neutrons?

2007-03-05 08:17:20 · 10 answers · asked by Anonymous

Please science answers. I don't need to here there's less shade or something

2007-03-05 08:14:02 · 2 answers · asked by chrisbaronwimmer 1

A 9 kg mass on a frictionless incline surface is connected to a 2.6 kg mass. the pully is massless and frictionless, and the connecting string is massless and does not stretch. the 2.6 kg mass is acted upon by an upward force of 4.1 N and thus has a downward acceleration of only 5.7 m/s/s. the acceleration og gravity is 9.8 m/s/s.

2007-03-05 07:49:28 · 1 answers · asked by Anonymous

If you were floating with your head in the precise center of a perfect featureless sphere twenty feet in diameter, with a perfectly reflective inner coating.

2007-03-05 07:44:34 · 1 answers · asked by juicy_wishun 6

The law of the conservation of energy states that energy can't be created or destroyed. All energy that we have now was there at the big bang. We are using energy to exist. Since it can't be destroyed where is it going? We are using stored energy from oil and coal which is being depleted but energy can't be destroyed. Where is it? I don't think that it is becoming part of the mass of the planet.

At some point everything will collapse back to the initial state before the big bang with all the original energy. How? Have we existed without using anything?

Is all energy that we have used just sitting in space in some form?

2007-03-05 07:34:14 · 4 answers · asked by Barkley Hound 7

Ok i am doing my Science homework and my teacher said we need to do work ourselves because he doesn't like the modern way of teaching, where he tells us... anyway. Can anyone explain what happens to the nucleus during radioactive decay caused by emission of a beta particle? Thanks for any help

2007-03-05 07:33:22 · 2 answers · asked by Anonymous

I mean aside from his recanting of quantuam theory. Also, aside from his most famous equation (E=mc2; I can't get this computer to express "squared" but that's what I mean), how are his theories put down mathmetically? What are the equations? Any sites would be good.

2007-03-05 07:28:51 · 5 answers · asked by Mr_Sageseer 2

has anyone ever tried thinking diadectically about state vector collapse and noticed any effects?

2007-03-05 07:16:04 · 1 answers · asked by kuiper 2

The puck slides along inclined plane. Initial velocity of the puck
is in horizontal direction (i.e. at right angle to plane inclination)
and has absolute value v0 = 1m/s.

http://alexandersemenov.tripod.com/puck/...

The angle of inclination is adjusted so, that coefficient
of kinetic friction is exactly equal to tan(a).


What is terminal velocity v1 of the puck?

2007-03-05 07:02:45 · 1 answers · asked by Alexander 6

If altitude is just few meters then the answer is T = √2h/g.
But what if an object is released on very high altitude, h >> Rearth?

2007-03-05 06:54:39 · 6 answers · asked by Alexander 6

I need this for my Chemistry class and my teacher said it had something to do with physics.
Please help! Thanks.

2007-03-05 06:53:22 · 11 answers · asked by ? 2

Either as one competing theory has been proven without a doubt to be the correct theory, or simply as evidence has come out to destroy the general foundation of the theory in question.

2007-03-05 06:53:19 · 12 answers · asked by whitehorse456 5

Two parallel conductors carry currents in opposite directions, as shown in Figure P19.56. One conductor carries a current of 10.0 A. Point A is the midpoint between the wires, and point C is 5.00 cm to the right of the 10.0 A current. I is adjusted so that the magnetic field at C is zero.

Figure P19.56
http://www.webassign.net/sf5/p19_52.gif

(a) Find the value of the current I.
A
(b) Find the value of the magnetic field at A.
T

2007-03-05 06:50:53 · 2 answers · asked by guitarx313 1

A 0.220 kg metal rod carrying a current of 10.0 A glides on two horizontal rails 0.520 m apart. What vertical magnetic field is required to keep the rod moving at a constant speed if the coefficient of kinetic friction between the rod and rails is 0.100?
T

2007-03-05 06:50:17 · 1 answers · asked by guitarx313 1

A single-turn square loop of wire, 2.00 cm on a side, carries a counterclockwise current of 0.200 A. The loop is inside a solenoid, with the plane of the loop perpendicular to the magnetic field of the solenoid. The solenoid has 30 turns per centimeter and carries a counterclockwise current of 10.0 A. Find the force on each side of the loop and the torque acting on the loop.
N (top side)
N (bottom side)
N (left side)
N (right side)
Nm (torque)

2007-03-05 06:49:47 · 2 answers · asked by guitarx313 1

What is the purpose of the liquid nitrogen in a scanning electron microscope with EDX system?

2007-03-05 06:48:34 · 1 answers · asked by Mark N 2

please refer to the website or book as well. i need the figure for coursework.

2007-03-05 06:46:52 · 2 answers · asked by amandac 3

Two blocks are fastened to the ceiling of an elevator. The elevator accelerates upward at 2.00 m/s2. The blocks both have a mass of 14.0 kg. Find the tension in each rope.

The blocks are arranged, rope 1 then block 1, then rope 2 starts at the bottom of block 1 then block 2 is at the bottom of rope 2.

Can someone show me how to do this, im not sure what equations to even use. Thanks

2007-03-05 06:42:01 · 2 answers · asked by ? 1

A 0.220 kg metal rod carrying a current of 10.0 A glides on two horizontal rails 0.520 m apart. What vertical magnetic field is required to keep the rod moving at a constant speed if the coefficient of kinetic friction between the rod and rails is 0.100?
T

2007-03-05 06:30:52 · 1 answers · asked by Anonymous

Please help me :)

2007-03-05 06:12:10 · 1 answers · asked by jeremy 1

2007-03-05 05:44:08 · 12 answers · asked by ankurd_6 1

Of what use is knowing the center of mass of an object when making calculations?

2007-03-05 05:41:55 · 9 answers · asked by angelgirl 2

Take the equation for velocity. Velocity is a vector, meaning it is based on magnitude and direction.

Velocity = Change in Distance / Change in Time

Cross multiply to get:

Velocity * Change in Time = Change in Distance

Divide by Velocity to get:

Change in Time = Change in Distance / Velocity

Now, we want time to go backwards, so let's make the Change in Time negative. But to do so, we'll have to multiply the other side by -1 as well.

-Change in Time = -Change in Distance / Velocity

So what this is saying, is that to make time go back, we'll need to have a velocity in one direction while the distance changed from this velocity is in the other direction. This is an impossible feat.

Please tell me if there is something wrong with my logic here. I know that time travel is illogical anyway, but please tell me if I've done something wrong here.

2007-03-05 05:40:57 · 2 answers · asked by rickpetralia 1

ahhhhhhh homework

2007-03-05 05:37:46 · 7 answers · asked by Emma 1

Is it even possible? and if so what is the reaction it has? and if two atoms can not touch what is our sense of touch based on? Perception?Vibrations?

2007-03-05 05:28:01 · 7 answers · asked by someoneelse 2

A 0.220 kg metal rod carrying a current of 10.0 A glides on two horizontal rails 0.520 m apart. What vertical magnetic field is required to keep the rod moving at a constant speed if the coefficient of kinetic friction between the rod and rails is 0.100?
T

2007-03-05 05:27:24 · 1 answers · asked by Anonymous