Roller skating is traveling on surfaces with roller skates. It is a recreational activity, a sport, and a form of transportation. Roller rinks and skate parks are built for roller skating, though it also takes place on streets, sidewalks, and bike paths.
Roller skating originated in the performing arts in the 18th century. It gained widespread popularity starting in the 1880s. Roller skating was very popular in United States from the 1930s to 1950s, then again in the 1970s when it was associated with disco music and roller discos. During the 1990s, inline outdoor roller skating became popular. Roller skating has often been a part of Black and LGBT history in particular.
Sport roller skating includes speed skating, roller hockey, roller derby, figure skating and aggressive quad skate. It is also widespread as a hobby.
Homework Statement
I performed an experiment with a plastic tube and a ball. The tube was shaped into a roller coaster track with a circular vertical loop of diameter 0.12 m. I have to calculate the centripetal acceleration of the ball while in motion within the loop. I have only studied...
Homework Statement
Imagine there is a piece of sine-shaped rollercoaster track. We compare trains of different length which all have the same average speed riding over the track. If all friction is neglected, is the difference between the maximum and minimum speed:
A. bigger for longer trains...
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
A roller coaster moves 200 ft horizontally and then rises 135 ft at an angle of 30(degrees) above the horizontal. Next, it travels 135 ft at an angle of 40(degrees) below the horizontal. Use graphical techniques to find the roller coaster's displacement from its starting...
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...
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...
Hallo.
I have a problem
i want to know why my Invertor is burn.
the Object speed 0.5 m/s in 3 seconds then constant 0.5 m/s
that mean acceleration = 0.167
for Object
use F=ma = 5000*.167= 835 N
and Torque= F*r = 835 * 0.20 = 167 N.m
for Motor
Omega W=n * 2pi/60 =...
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...
I am doing an analysis on an actual roller coaster and have Altitude graphs as well as Y and Z acceleration graphs. I am just having trouble with a few things:
1.
With the altitude graph (height vs. time), there is a bit with an incline. Is it possible to find the velocity (it is uniform...
Hi Guys,
I have been scouring books and the internet for a while as well as my university notes but I really can't find any information on why a roller can be used as a replacement for a gear. The situation is that I have to design a test rig to simulate two gears running together to...
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
Homework Equations
The Attempt at a Solution
Ride Designer
A local carnival owner wants you to design a ride for him. Riders are strapped inside a rolling car which rolls down the track shown below. (sorry i can't copy the diagram)
H=50m with 2 loops and...
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
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 Figure P5.66...
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...
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...