Physics - December 2007

What forces apply on diffrent parts of a roller coaster?
I know that GPE, EK, Friction, Air resistance, Normal apply on almost every part of the roller coaster, but if I want to be exact:

1) What other force applies on a roller coaster model?
2) Explain a bit more about the force of .... I don't know what it's called, but I think it has something to do with the turning around a "center" in the loops.

2007-12-17 09:54:03 · 3 answers · asked by Toczic 1

Hi, here are the questions I have, and I have no idea on how to answer them, any help would be greatly appreciated, thanks!

1.a YAG laser has a frequency of 2.8E14, what is its wavelenght?
2. What is the frequency of light that has a wavelength of 480nm
3. an object is located 1.8m from a plane mirror, how far is the image away from the object
4. what is the critical angle for dimond submerged in water?
5. what is the index of refraction of an object in wich light travells at 1.97e6

Thanks, the ansers to these questions would be really appreciated.

2007-12-17 09:53:42 · 1 answers · asked by Александр Вальтерович Литвиненко 2

Hi I found this on one of my quizzes and cant understand the question. any help is appreciated.

You can decrease the pitch of a guitar string by replacing that string with a thicker string. list two other different means of decreasing the pitch of the original guitar string.

2007-12-17 09:51:00 · 3 answers · asked by wienrshnitzel 1

What constant force is exerted on the bullet while it is traveling down the 0.9 m length of the barrel of the rifle? Answer in newtons.

2007-12-17 09:50:10 · 2 answers · asked by racecar 1

i hear many explanations, but my mind cannot seem to fathom, or grasp the concept. any help?

2007-12-17 09:49:13 · 2 answers · asked by Anonymous

2007-12-17 09:45:55 · 2 answers · asked by keke z 1

I have made a roller coaster model for my school project and for the roller coaster I need do make a VERTICAL PRIFILE/Blue Print (as it says on the project information sheet). So my Q is :

HOW Do You Make A Vertical Profile(/Blueprint) For A ROLLER COASTER?

I know a bit about the fact that it should be curved and straight line at different points and the loops need to be unwidened and measured as if it was straight with ups and downs on them, but can you explain more and accurate?

Thank You.

2007-12-17 09:45:33 · 1 answers · asked by Toczic 1

The bob of a pendulum has a mass of 2.0 kg. The bob is pulled sideways so that it is 0.25 m above the reference level.

What is the speed of the pendulum at the middle of the swing (resting position where there's only kinetic energy?)?

2007-12-17 09:44:22 · 2 answers · asked by Anonymous

suppose that the cicle is roled to the right along the line until the letter t is again in an upright position write three distances it could hav roled and explain

2007-12-17 09:44:06 · 1 answers · asked by siya 1

A pair of oppositely charged parallel plates are separated by a distance of 5 cm with a potential difference of 550V between the plates.A proton is released from rest at the positive plate at the same time that an electron is released from rest at the negative plate.Disregard any interaction between the proton and the electron.

a) how long does it take for paths of the proton and electron to cross?

b) how fast will each particle be going when their paths cross?

c) How much time will elapse before the proton reaches the positive plate?
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I DONT GET WHATS MEANT BY THE FIRST 2 QUESTIONS, CAN YOU PLEASE EXPLAIN THE QUESTION AND THEN EXPLAIN ALL YOUR ANSWERS?

I PROMISE ILL GIVE A BEST ANSWER FOR THOSE WHO KNOW AND EXPLAIN!!
THANKS VERY MUCH FOR UR TIME

2007-12-17 09:32:56 · 2 answers · asked by G3P 3

1.Suppose 200 J of work is used to compress a gas. If 125 J of heat escape in the process what is the change in internal energy of the gas?

I know it has to do with the change in internal gas equals work plus heat but I'm not too sure how to set it up.

what is the beat frequency when a 330 Hz sound and 332 Hz sound occur simultaneously?

What is the ideal efficiency of an automobile engine where fuel is heated to 700 K and outdoor air is 280 K?

A weight suspended from a spring is seen to bob up and down over a distance of 30 centimeters twice every three seconds. What is the period of oscillation? frequency? amplitude of oscillation?

Again, thanks to everyone who can help

2007-12-17 09:19:31 · 1 answers · asked by wienrshnitzel 1

We have had to build a roller coaster. Now we have to calculate force of friction but I do not know how. Here is the data that I have:

the acceleration of the ball on the initial drop= 6.4 m/s

the average speed of the drop= 1.67m/s

the average theoretical speed of drop = (speed without friction) = 1.73 m/s

theoretical instantaneous speed after drop( without friction)= 3.46 m/s

height of drop = 0.61 m

length (distance) of drop= 0.9 m

mass of marble = 5 g

2007-12-17 09:13:39 · 1 answers · asked by Caroline B 2

A beam has an angular velocity of 10 rad/s. After 40 revolutions its angular velocity has increased to 30 rad/s. Find angular acceleration. If the beam has a mass of 10 kg and a force of 10N acting on it. Find F1 which is located at the end of the 5 meter beam.

**I'm not sure if you have to convert rad/s to rev/s?

2007-12-17 08:38:17 · 1 answers · asked by Anonymous

1. A coin is placed 12.5 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 36 rpm is reached, at which point the coin slides off. What is the coefficient of static friction between the coin and the turntable?

2. A 1100 kg car rounds a curve of radius 70 m banked at an angle of 12°. If the car is traveling at 90 km/h, will a friction force be required?
If so, how much force? (Enter zero if there is no friction force.)

Estimate the force a person must exert on a string attached to a 0.110 kg ball to make the ball revolve in a horizontal circle of radious 0.600 m. The ball makes 1.80 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of FT, and the angle it makes with the horizontal. [Hint: Set the horizontal component of FT equal to maR; also, since there is no vertical motion, what can you say about the vertical component of FT?]
FT = N
= °

2007-12-17 08:36:05 · 1 answers · asked by Shawn Carter 1

2007-12-17 08:34:06 · 1 answers · asked by britney♥ 2

A certain radar installation used to track airplanes transmits electromagnetic radiation of wavelength 7 cm.
a) What is the frequency of this radiation, measured in billions of hertz (GHz)? ANS: 4.2857GHz
b)What is the time required for a pulse of radar waves to reach an airplane 6 km away and return? ___s (note: it is not 2x10^-5)

2007-12-17 08:13:37 · 3 answers · asked by TheLostOne 3

yesterday??

2007-12-17 07:52:21 · 2 answers · asked by clavdivs 4

2007-12-17 07:49:24 · 3 answers · asked by Cookie A 1

after coming down a hill with a 35 degree slope, the sled with a mass of 35 kg, coasts up a long hill with a 30 degree slope that has a coefficent of friction of 0.083. How far up the second hill does the sledder go?

2007-12-17 07:36:35 · 2 answers · asked by Anonymous

How fast would a car be going if it travelled 45miles in 26minutes 44seconds?

2007-12-17 07:33:13 · 1 answers · asked by telly1989 2

My friend and I are going to do a physics project. We are making a big sling shot and using math to find out where it hits the ground. We have a scale in which will convert to how much force this sling shot will shoot with, but we dont know how to figure out the distance and all. How do you go about doing this?

2007-12-17 07:25:32 · 2 answers · asked by Anonymous

Every explanation/illustration describes them as 'holes' in spacetime, usually the familiar funnel shape. Images of trampolines with bowling balls to describe gravity seem to be a common starting point.
But since space is not a flat plane, is it therefore a 'hole' from every angle?

A collapsed star would collapse inward, and so it seems that the proper illustration of a black hole would look similar to a 3D representation of a tesseract - only spherical - rather than a funnel coming to an infinitely dense point.

Sorry if this question is missing or misusing technical terminology.

2007-12-17 07:23:18 · 2 answers · asked by Spencer H 1

a box is being pushed across an elevator floor.
the pushing force is 3.14 N
the elevator is accelerating upwards at 0.55 m/s^2
what is the coefficent of kinetic friction?

much appreciated <3

2007-12-17 06:59:10 · 2 answers · asked by Anonymous

How does electric potential aid an appliance? What would it be like without it?

2007-12-17 06:18:09 · 3 answers · asked by Anonymous

In your home, electric potential is in numerous appliances. (go ahed an name some common ones if you want.) Can you name some interesting or uncommon devices that have an intriguing electric potential? And give me its votls and amps...

Thanks

2007-12-17 06:16:20 · 2 answers · asked by Anonymous

2007-12-17 06:15:26 · 32 answers · asked by Anonymous

when i'm given ..
acceleration is 0.55 m/s^2
pushing force on a 1kg box is 3.14 N

fyi
the box is being pushed across the floor of an elevator that is moving up.

2007-12-17 05:59:45 · 4 answers · asked by mandm 2

a 75 kg man is on a surface that has a coefficent of kinetic friction with his shoe soles of .15 and a static coefficent of 0.2. A 50 kg woman is on a surface that has a coefficent of kinetic friction with her shoe soles of 0.25 and a static coefficent of 0.35. If they have a tug a war, (a) who will be the first to move and (b) what will the acceleration be if the stationary person maintains as much tension in the rope as possible without slipping?

2007-12-17 05:48:18 · 1 answers · asked by mandm 2

ok here it is ..
a car is going 40m/s sees a mosse in the roadway ahead. (a) if the coefficent of friction for rubber on asphalt is .95 how far down the road must the moose be to avoid being hit? (b) if the moose is 35 meter down the road, what will be the speed of impact?

thank you soo much

2007-12-17 05:27:11 · 4 answers · asked by mandm 2

when activated somehow. You also somehow figured out how to control it.

Would you hand it over to authorities or what?

2007-12-17 05:15:20 · 11 answers · asked by Anonymous