Roller Definition and 304 Threads

A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its centripetal acceleration at this point? g downward g upward 0.5 g downward 2 g upward...

Homework Statement You have been hired to design a roller coaster and are working on two sections. The roller coaster rolls on the track, but is not attached. If the cars will have a speed of 35 m/s at the bottom of the hill, what is the radius that the circular bottom section of the...

A roller coaster starts at height (h). It goes down this hill and then goes up a second hill that is at a height of 28.5 m at a speed of 15.8 m/s. How high was the initial hill? Given equations: U=mgh KE=1/2mv^2 W=Fd P=W/T Honestly, we've never done a problem like this before and...

believe it or not, this is a totally serious question. I am currently trying to design a roller coaster. Given that it is at a slope, what equation(s) would i use to find final velocity knowing gravitational acceleration, slope, and distance of my slope? ex: my slope is 45 degrees in a downward...

So my physics class (No, it's not homework, per se, so I didn't put it in that section) decided we were going to build roller coasters. (Basically, it's a big pain. I wish we hadn't.) Anyway, here are the rules: Has to be for a golf ball, made out of recycled materials. This also means no...

Homework Statement If rolling mill is running at 10 meters per second and roller table after mill is running at 20 meters per second. Before cutting of bar, it will move at 10 meters per second. Before cutting, roller table is trying to pull the bar, but since bar is not cut, it will...

If rolling mill is running at 10 meters per second and roller table is running at 20 meters per second. Before cutting of bar, it will move at 10 meters per second. After cutting bar has to move with the speed of 20 meters per second on roller table. How much time bar will take to reach to...

Question in this link (includes diagram): http://b.imagehost.org/view/0431/photo" I am assuming it require Energy equations The attempt at solution = Fail Please HELP!

Homework Statement A boy on roller blades throws a jug of water away from himself, giving it a speed of 14m/s. The boy's mass is 38kg and the mass of he jug and the water is 7.9kg. What is the velocity gained by the lad? Homework Equations Not sure. The Attempt at a Solution Not sure.

Homework Statement A mass of 100kg is h meters high on a track that extends into a loop that has a radius of 20m. Assume track is frictionless. I need to find minimum height for the mass to make it around the loop without falling off or going backwards. Homework Equations Conservation...

Homework Statement The top of the roller coaster is 77.7m above the earth. From this height what speed can be reached when it reaches the bottom of the drop? This problem must be solved using work and energy equations not kinematic equations.. Homework Equations Wg=-(mgyf-mgyi)...

Homework Statement Suppose the vertical loop has a radius of 5.40 m. What is the apparent weight (Wap) of a rider on the roller coaster at the bottom of the loop? (Assume that friction between roller coaster and rails can be neglected. Give your answer in terms of m and g.) Homework...

Homework Statement A roller coaster goes through an inside vertical loop at the minimum speed required to just barely make it through the top of the vertical track. At the very top of the track, the magnitude of the centripetal force acting on the 'coaster is a. mg. b. 2 mg. c. 6 mg. d...

Homework Statement The roller coaster car shown below has a mass of 800 kg when fully loaded with passengers. (a) If the car has a speed of 25.0 m/s at point A, what force does the track exert on the car at that point. (b) If the car has a speed of 10.0 m/s at point B, what force does the track...

Determine the reactions at the pin A and at the roller at B of the beam. I honestly have no idea how to do this problem. It gives the answers as... Ax = 192 N Ay = 180 N By = 642 N Please help.

Homework Statement A roller coaster starts its descent with an initial speed of 4 m/s. it moves through a distance of 135 ft (41.1 m) along an incline that makes an angle of 40 degrees with the horizontal. Neglect friction and find its speed at the bottom of the incline. Homework Equations...

Homework Statement While most people like high speeds on roller coasters, it is actually the change in acceleration that thrills them. To add more thrills to a ride, a roller coaster designer has decided to make the downward descent from his first hill bumpy. The first 49 m of the track will...

Why do we feel terrified in roller coasters, especially when we sit in the first car in the edge?

Roller Coasters--help a writer out? I'm a freelance writer working on an article about how roller coasters work. It's to be a fairly short article for a children's Web site, so I don't need massive amounts of information (and I am doing research of my own as well), but I thought it might be fun...

Homework Statement Consider a frictionless roller coaster. The acceleration due to gravity is 9.8 ms-2. Passenger cars start at point A with zero initial speed, accelerate as they go down to a point B, swing around the vertical circular loop B-C-B of radius 15m, then go on towards further...

Homework Statement 1. Assume the mass of the roller coaster is 750 kg. Answer the following. a) If the height of the first hill is 35 meters (measured from the ground), calculate the potential and kinetic energies at this highest position on the track. b) When the riders are at the first...

Homework Statement A roller coaster ride lasts only 60 seconds. What is the total distance traveled during the 60 seconds, given the position of the roller as a function of time is s(t) = 4cos(t)sin(t). Homework Equations Position as a function of time S(t) = 4cos(t)sin(t) The...

Homework Statement In one roller coaster car, a small 0.10 kilogram ball is suspended from a safety bar by a short length of light, inextensible string. The car is then accelerated horizontally, goes up a 30 degree incline, goes down a 30 degree incline, and then goes around a vertical...

Homework Statement Homework Equations a=(v2-v1)/t The Attempt at a Solution I used the vector between the point before A and A as my v2. I used the vector between the point two before A and the point before A as my v1. I put them tail to tail and he resultant vector looks like (E) in the...

There is this cone that rolls uphill by itself, by shifting its centre of gravity. http://plus.maths.org/issue40/features/uphill/index-gifd.html" I wouldn't have looked up the mathematics of the issue if I hadn't seen it working with my own 2 eyes at a friend of mine's university physics...

Hi, I am trying to make a conveyor that has a roller expension mechanism. Please take a look at this drawing. http://www.flickr.com/photos/46279408@N06/4251882419/sizes/o/ As the drawing shows, you can imagin two supporting beam on each side of rollers as rollers will need to be fixed or...

Hi everyone. I was wondering about the equation of a roller coaster loop. Most people do not realize this, but a roller coaster loop is not a circle.. but rather a 'clothoid loop' shape.. the reason for this being, with a circular loop, the 'G force' varies quite a lot, and is uncomfortable...

I am working on a new 45kW centrifugal water pump, which is >70C at the roller bearing pedestal. I wonder what' s causing such high temperature. The vibration measured at the bearing pedestal is indeed very small. The pump seems to be well balanced and lubricated.

Homework Statement A roller coaster moves through a vertical loop at a constant speed and suspends its passengers upside down. In what direction is the force that causes the coaster and its passengers to move in a circle? What provides this force? The Attempt at a Solution We started this...

Homework Statement Gravitational roller coaster makes a circular loop of radius 8 m. - What should the minimum height be for the roller coaster to make the loop without falling at the top? - What is the velocity of the cart in the point B, after it finishes the loop? (See picture) - What is...

Homework Statement A rollercoaster car and passengers have a combined mass of 1620 kgm, and they descend the first hill at an angle of 45o to the horizontal. With what force is the roller coaster pulled down the hill? Homework Equations The Attempt at a Solution Vertical force =...

Homework Statement A roller coaster goes around a vertical loop of 20.0m. a) What is the minimum speed the cars must be moving so that the passengers do not fall out at the top? b) Assuming that the car maintains the same constant speed what is th effective weight of the passengers at the...

Homework Statement http://img198.imageshack.us/img198/374/20856431.jpg Homework Equations Moment = R cross F Couple moments?The Attempt at a Solution I think I have to sum the moments from A, B and L all about C but I am not sure about the relationships between them.

Homework Statement http://img32.imageshack.us/img32/6505/p450.gif [SIZE="1"]Cam mechanisms are used in many machines. For example, cams open and close the valves in your car engine to admit gasoline vapor to each cylinder and to allow the escape of exhaust. The principle is illustrated in...

A roller coaster moves 201 ft horizontally, then rises 150 ft at an angle of 27.5o above the horizontal. It then travels 150 ft at an angle of 38.2o below the horizontal. What is the magnitude of its displacement from the starting point at the end of this movement? What is the angle relative to...

Homework Statement A roller coaster car is on a track that forms a circular loop of radius R in the vertical plane. (a) If the car is to maintain contact with the track at the top of the loop, what is the minimum speed v that the car must have at the bottom of the loop? Ignore air...

Anyone have fear of them? I'm 21 years old and I still won't go on one.

Homework Statement A small cube (m=0.450 kg) is at a height of 393 cm up a frictionless track which has a loop of radius, R = 58.95 cm at the bottom. The cube starts from rest and slides freely down the ramp and around the loop. Find the speed of the block when it is at the top of the loop...

Homework Statement A 4.0X104 (or 40,000) Kg roller coaster starts from rest at point A. Neglecting friction, calculate its potential energy relative to the ground, its kinetic energy and speed at points B, C, and D. http://img189.imageshack.us/img189/6162/1234q.png (scanned Image, if you...

Homework Statement A roller coaster car on the frictionless track shown in the figure below starts from rest at height h. The track's valley and hill consist of circular-shaped segments of radius R. Find the formula for the maximum height h_max for the car to start so as to not fly off the...

http://img13.imageshack.us/img13/9297/masteringphysicsq1.jpg At the bottom it's 510N, Top 666N, at bottom Fnormal=netforce= mv^2/r + mg http://img13.imageshack.us/img13/8244/masteringphysicsq1g.jpg -my attempt I'm not sure how to figure out the acceleration or determine the...

I have two questions. when a car or roller coaster travels in a loop. At the top of the loop the forces that acts on the car are all downwards i.e. W and normal , so the net force is acting downward. I can't figure our any other force acting upward, so what actually will keep the car sticked to...

Homework Statement The figure shows a roller coaster car mass m= 3,000kg, on a portion of a roller coaster ride. The height difference between points A and B is 35m. The height difference between B and C is 23m. The car starts from rest at point A. Take y=0 point to be point B. For parts...

hello, I'm trying to study for the mcat, and I have a conceptual question about normal force, mg, and centripetal force during a loop-de-loop on a roller coaster. Could you validate these force equations? 1. At the very bottom of the loop: N - mg = ma = mv^2 / r N = mg + ma 2. At the...

Homework Statement A 900 kg roller-coaster car is initially at the top of a rise, at point A. It then moves 165 ft, at an angle of 40.0° below the horizontal, to a lower point B. Choose the car at point B to be the zero configuration for gravitational potential energy of the roller...

Homework Statement Show that on a roller coaster with a circular vertical loop, the difference in your apparent weight at the top of the circular loop and the bottom of the loop is 6 g's--that is six times your weight. Ignore friction. Show also that as long as your speed is above the minimum...

Homework Statement A 350kg roller coaster starts from rest at point A and slides down the frictionless loop-the-loop shown in the accompanying figure. http://session.masteringphysics.com/problemAsset/1027487/5/1027487.jpg 1. How fast is this roller coaster moving at point B? 2. How hard...

Homework Statement http://img57.imageshack.us/my.php?image=fullscreencapture322009.jpg Part of the track of an amusement park roller coaster is shaped as shown below. A safety bar is oriented length-wise along the top of each car. In one roller coaster car, a small 0.10 kilogram ball is...

Homework Statement The normal force equals the magnitude of the gravitational force as a roller coaster car crosses the top of a 60m diameter loop-the-loop. Homework Equations What is the car's speed at the top? The Attempt at a Solution hello, this problem doesn't give much...

Homework Statement The diagram below shows a roller coaster ride which contains a circular loop of radius r. A car of mass m begins at rest from point A and moves down the frictionless track from A to B where it then enters the vertical loop (also frictionless), traveling once around the...