Physics - December 2006

2006-12-10 11:13:04 · 5 answers · asked by Anonymous

I asked whether mixing yellow and red light would form orange, and I got a variety of answers. One person said that there is nothing special about primary colours, and that they were only chosen because they're close to what the cones on our retnas pick up. If that's the case, it must be possible to form 'primary' colours from other colours.

For example, what could you add together to make red? I haven't found any way of doing this.

2006-12-10 10:59:40 · 4 answers · asked by Anonymous

how do you calculate it given the maximum height, range, or anything? basically how do calculate it for a projectile launched at an angle? and what is it exactly?

2006-12-10 10:46:09 · 3 answers · asked by starbucksluvrxoxo 3

Assume that a can of soda was held at a steady temperature (say 4°C) in a fridge for a long time. Then it is placed on a desk in a classroom. Describe the temperature evolution in the can. In your model, what is the temperature in the center of the can after 10 seconds, 1 minute. 5 minutes, 10 minutes, and 30 minutes, after it was taken out of the fridge? (Find the numerical values of the temperature, not just a formula!) Discuss, whether the answer obtained (and model used) is reasonable or not. Furthermore, you may want to discuss the influence of parameters of the problem (size of the can, classroom temperature, different outer shell materials, pressure in the can, drinking from the can, etc.) on the process.

2006-12-10 10:41:42 · 1 answers · asked by Pushpendra C 1

2006-12-10 10:32:38 · 3 answers · asked by j train 2

A 1.25-kg book in space has a *weight* of 8.35 Newtons. What is the value of the gravitational field at that location?

Please help me with this problem.
I'm having trouble understanding how to find the answer.

2006-12-10 10:21:23 · 3 answers · asked by vicky p 1

Here what is says:

One whimsical statement of the laws of thermodynamics - probably not one favored by gamblers - goes like this:

I. You can never win; you can only lose or break even.
II. You can only break even at absolute zero.
III. You can never get to absolute zero.

What do you mean by "win, "lose," and "break even?"
[Hint: Thank about a heat engine.]

What does this mean??? I have absolutely no clue. HELP!!!

2006-12-10 10:21:15 · 3 answers · asked by Sir Guitarist 2

physics 1: Mechanics
physics 2: Electricity and Magnetism
physics 3: Heat and Light
physics 4: Quantum Mechanics

2006-12-10 10:20:12 · 9 answers · asked by wtfitsnguyen 2

2006-12-10 10:14:34 · 11 answers · asked by kneu93 3

2006-12-10 10:10:24 · 7 answers · asked by sue m 2

2006-12-10 10:02:17 · 6 answers · asked by sue m 2

2006-12-10 10:02:08 · 1 answers · asked by j train 2

2006-12-10 09:59:28 · 1 answers · asked by Pushpendra C 1

How real are laser weapons? is it just science fiction or do they really exist..and please proivide links/explaination of laser weapons and the usage of lasers in the military, I have to write an essay on laser in weapons but i cant figure out where to start from, so any help will me appreciated.

2006-12-10 09:57:30 · 4 answers · asked by Anonymous

In a church choir loft, two parallel walls are 3.43m apart. The singers stand against the north wall. The organist faces the south wall, sitting 0.687m away from it. So that she can see the choir, a flat mirror 0.518m wide is mounted in the south wall, straight in front of the organist. What width of the north wall can she see? Answer in units of m.

2006-12-10 09:57:12 · 2 answers · asked by glorydefined 1

2006-12-10 09:56:09 · 17 answers · asked by sue m 2

an aluminum window frame has an area of 400 cm^2 and is 4.00 cm thick. find the energy loss per day due to conduction when the inside temperature is 20.0 degrees C and the outside is 0 degrees C.

How do I find the Energy Loss?

2006-12-10 09:50:26 · 1 answers · asked by Trevor M 1

label A for top, B for left hand side, C for right hand side, and D for bottom

2006-12-10 09:40:21 · 2 answers · asked by you're_a_mango 2

2006-12-10 09:36:20 · 4 answers · asked by sue m 2

2006-12-10 09:17:25 · 6 answers · asked by Cool Ramlows 1

A box weighing 70N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. Determine the force that the table exerts on the box if the weight hanging on the other side of the oulley weighs (a) 30N (b) 60N and (c) 90N.

2006-12-10 09:14:12 · 2 answers · asked by Anonymous

You remember E=mc2.But he said mass increased with velocity.
That is not correct - the potential energy increases, The energy, not the mass, the mass will always be the same but weigh differently according to the ambient gravity.

2006-12-10 09:10:57 · 14 answers · asked by Anonymous

Please help me with this problem.
It seems so easy.
But I'm having trouble setting it up.

2006-12-10 09:05:05 · 3 answers · asked by vicky p 1

Why is the sum of the forces on colliding objects zero? (momentum is conserved)

2006-12-10 09:04:00 · 2 answers · asked by coolguy0603 1

i havee nooo idea!!
helpp!!

2006-12-10 08:47:35 · 5 answers · asked by Anonymous

A string of negligible mass is wound around a uniform disk of radius R and mass M. The disk is released from rest with the string vertical and its top end tied to a fixed bar. Find the acceleration of the center of mass of the disk.

I know you have the 2 forces acting on the disc, mg acting down, and the force of the torque caused by tension of the string on the disc. I know F=ma and Sum of torques=0 and I for a disc is 1/2(MR^2). My problem is what to do next and thus solving this problem. Thank you for your help.

2006-12-10 08:41:51 · 1 answers · asked by Anonymous

2006-12-10 08:12:20 · 3 answers · asked by Anonymous

2006-12-10 08:06:34 · 2 answers · asked by babygirl2857 2

Uri is on a flight from Boston to Los Angeles. His plane is traveling 25.0 degrees south of west at 300 mph . Val is on a flight from Miami to Seattle. Her plane is traveling 35.0 degrees north of west at 300 mph. Somewhere over Kansas, Uri's plane passes 1000 ft directly over Val's plane. Uri is sitting on the right side and can see Val's plane below him after they pass. Uri notices that the fuselage of Val's plane doesn't point in the direction that her plane is moving.
What is the angle between the fuselage and the direction of motion?

2006-12-10 08:02:28 · 1 answers · asked by physicsmed22 1

A motorcycle daredevil wants to set a record for jumping over burning school buses. He has hired you to help with the design. He intends to ride off a horizontal platform at 40 m/s, cross the burning buses in a pit below him, then land on a ramp sloping down at 20 degrees. It's very important that he not bounce when he hits the landing ramp because that could cause him to lose control and crash. You immediately recognize that he won't bounce if his velocity is parallel to the ramp as he touches down. This can be accomplished if the ramp is tangent to his trajectory and if he lands right on the front edge of the ramp. There's no room for error! Your task is to determine where to place the landing ramp. That is, how far from the edge of the launching platform should the front edge of the landing ramp be horizontally and how far below it?

How far from the edge of the launching platform should the front edge of the ramp be horizontally?
How far below the launching platform should the front edge of the ramp be?

2006-12-10 07:59:52 · 1 answers · asked by physicsmed22 1