Physics - June 2007

in terms of ease of assembly, heat transfer effiency, heat losses, etc....

2007-06-20 16:42:58 · 2 answers · asked by Anonymous

The ITER is being built in France. Fusion is the biggest renewable energy source that can be developed in the future. It will probably solve the energy crisis of electricity, and maybe even global warming.

2007-06-20 16:34:04 · 1 answers · asked by zheng89120 2

http://www.nysedregents.org/testing/scire/sciarch/psphysicstestja04.pdf
#37 answer and how ! THANK YOU!!!

2007-06-20 15:47:04 · 2 answers · asked by Vivian H 1

Explain Quantum Mechanics in a clear precise paragraph or two the delves into most aspects of it. Appericiate it.

2007-06-20 15:23:15 · 7 answers · asked by symperl 2

2007-06-20 15:07:41 · 7 answers · asked by princy j 1

A railroad car of mass 3.50 x10^ 4 kg moving at 2.00 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s.

(a) What is the speed of the three coupled cars after the collision in m/s

(b) How much kinetic energy is lost in the collision in J

2007-06-20 15:07:11 · 2 answers · asked by Idaly M 2

Which direction will the energy transfer occur in and why?

2007-06-20 14:41:52 · 7 answers · asked by Answer Champion 3

I see it in the dark or low light, very similar to the way cameras capture it. If you're unfamilar: take a picture of a lit cigarette, and the cherry will appear pale blue. Or a spot next to it will. I see the cherry itself, but just as bright, there's an opaque pale blue streak behind it if it's in motion or a blue dot if it jerks slightly.

I also see a purple haze around red lights. Sometimes, if the light is very small, the purple takes the form of a figure 8 with pointy ends. Like a lens-flare.

My boyfriend doesn't see these things at all, or only if he squints. My theory is that it's a defect of my poor vision. Like, the lense of my eye is mal-formed or something. I'm not on drugs or anything. I need glasses but don't wear them - when I do, these things are very hard to spot. I've also noted that without glasses, the halo around lights is much, much larger and appears in seperated rings of color.

So. Is it possible that fuzzy vision can affect my color perception?

2007-06-20 14:39:57 · 5 answers · asked by skyeblack3 2

2007-06-20 14:02:13 · 5 answers · asked by Anonymous

The whole question is:
"An 80.0kg box is pushed at a constant velocity along a frictionless incline as shown in the diagram. (sorry no diagram, I'm gonna describe it) How much work is done on the box in moving it from the bottom to the top of the incline?

Diagram: it would be easier if you drew this out from that im saying.
right angle triangle
7.0m height
10.0m hypotenuse

I know that you use W=Fd(cos x), but how do I figure out F when they say constant velocity?

2007-06-20 14:01:13 · 5 answers · asked by Tony L 3

three objects lie in the x, y plane. each rotates about the z axis with an angular speed of 6.00 rad/s. the mass (m) of each object and its perpendicular distance (r) from the z axis are as follows: (1) m1= 6.00 kg and r1= 2.00m, (2) m2= 4.00kg and r2=1.50m, (3) m3= 3.00kg and r3= 3.00m.

(a) find the tangential speed of each object.
(b) determine the totale kinectic engery of this system
(c) obtain the moment of inertia of the system
(d) find the rotational kinetic energy of the system

confused..anyone know who to work this?

2007-06-20 13:59:27 · 2 answers · asked by Anonymous

A bungee jumper makes a jump into the Gorge du Verdon in southern France from a platform 182 m above the bottom of the gorge. The jumper weighs 770 N and comes within 68 m of the bottom of the gorge. The cord's unstretched length is 30.0 m.

Assuming that the bungee cord follows Hooke's law when it stretches, find its spring constant. [Hint: The cord does not begin to stretch until the jumper has fallen 30.0 m.]

At what speed is the jumper falling when he reaches a height of 95 m above the bottom of the gorge?

2007-06-20 13:49:36 · 1 answers · asked by terra_flare_aqua_ciel 1

A 700 N man stands in the middle of a frozen pond of radius 6.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore at a speed of 6.0 m/s. How long does it take him to reach the south shore?

2007-06-20 13:37:06 · 2 answers · asked by Idaly M 2

A rowboat holding a large rock is floating at equilibrium in a swimming pool. If the rock is tossed out of the rowboat and sinks to the bottom of the pool will the water level of the pool rise, fall or remain the same?

2007-06-20 12:44:24 · 9 answers · asked by MT 1

two disks are rotating about the same axis. disk A has a moment of inertia of 3.4 kg m^2 and an angular velocity of +7.2 rad/s. disk B is rotating with an angular velocity of -9.8 rad/s. the two disks are then linked together without the aid of any external torques, so that they rotate as a single unit with an angular velocity of -2.4 rad/s. the axis or rotation for this unit is the same as that for the seperate disks. what is the moment of inertia of disk B?

2007-06-20 12:43:27 · 3 answers · asked by chly1459 1

I think it is one of Newtons laws? I forgot what it was..

2007-06-20 12:38:09 · 2 answers · asked by Jon Hutchison 3

My understanding of particle accelerators is that electromagnets are used to accelerate an ion to a very high percentage of light-speed before smashing it into another particle. The higher the energy of the particle, the more dramatic the collision (in terms of subatomic particles "liberated").
Could a high-intensity laser be used to increase the speed or thermal energy of the particle during its pre-collision acceleration?
Or would the particle be too small for a large number of photons to affect it?
If the laser could be utilized, would it be best positioned in front of or behind the particle with respect to the direction of travel?
Any other problems or benefits that come to mind?

2007-06-20 12:11:48 · 4 answers · asked by Eric 5

2007-06-20 11:33:29 · 11 answers · asked by Sheriff of R&S 4

kph or mph are both acceptable

2007-06-20 11:32:29 · 3 answers · asked by urafrigginidi0t 1

A supertanker of mass 1.0 x 10^8 kg travels 3.5 km, reaching a speed of 4.1 km/h from rest. What was the magnitude of the unbalanced force acting on it?

2007-06-20 10:50:00 · 5 answers · asked by Chess 2

ive alwasy wondered how to do it..i kno several people who can but noone will tell me..its the whole magicians never reveal there secrets..does anyone kno how to do it

2007-06-20 10:42:00 · 5 answers · asked by metallicarocks772 1

2007-06-20 10:10:42 · 10 answers · asked by Stop Sine 3

This is just a puzzle offered just for the fun of it to solve.

Suppose that both an elephant and a feather fall from a high tree. Which encounters the greatest force of air resistance in falling to the ground?

a) The elephant

b) The feather

c) Both the same

2007-06-20 10:00:31 · 4 answers · asked by ? 6

Hi. I was just wondering about work when ex. a rollercoaster is going along a loop .the work done by friction would that be 2Pi * r * Ff? and why is this? Because I thought work in circular motion was 0 ...what about anything going in a curve ..If I were to push a pall in a curved path with a force .


I have one more ques that ties into this:
How do you know what forces doing the work are important? like when I push a car along the floor, the force I exert is the only one considered to change the energy ...
I understand this cause it's an external force. And what ABout other forces?.but isn't friction an internal force and it changes the total energy?? How do I determine this for all cases?

2007-06-20 09:50:27 · 2 answers · asked by Anonymous

Do they lose their air in a few days even though I tied them tightly...?

2007-06-20 09:36:12 · 8 answers · asked by Smoky 3

19.76 torr

1976 torr

12.66 torr

1.97 torr

179 torr

2007-06-20 09:25:48 · 3 answers · asked by n r 1

2007-06-20 09:22:28 · 5 answers · asked by ko 1

when you travel in a vehicle with the speed of light and you look in your rear-view mirror, would the objects appear smaller then they are?

homework sucks!
never mind turning your lights on to see what they do.

2007-06-20 09:02:11 · 6 answers · asked by Anonymous

to clarify what if the force that keeps the universe together and spinning is not gravity but some sort of magnetic force acting upon each body....i mean each planet has poles , each planet has a magnetic field, opposite repel perhaps thats why the planets orbit...could this be possible?

2007-06-20 08:52:41 · 9 answers · asked by dreamerchacho 2

Town A and Town B are 100 meters apart. A car travels from Town A to Town B in 2 hours. Then , the car travels back to Town A from Town B in 3 hours.

What is the velocity of this trip after 5 hours?

2007-06-20 08:34:09 · 15 answers · asked by Pure 2