Track Definition and 329 Threads

Consider two balls on an inclined track with a constant angle. Ball Q is released from rest a tthe top of the track. Ball P is given an initial velocity directed up the track. Both balls have a constant acceleration directed down the track. at the instant that the balls collide, ball Q is going...

Centripetal force -- Train on a curved track Homework Statement You have a circular arc of railroad track to lay on the line from Dubuque to Albuquerque. The arc of track is 30º and the turn radius for the arc is 425 meters. It has to keep the path steady and secure for an ALP-46 locomotive...

Homework Statement A car travels a distance of 745 m along a circular track, and the driver finds that she has traveled through an angle of 475°. What is the radius of the track? Homework Equations None that I know. The only thing I know is that the track is circular The Attempt...

This porblem has been killing me. It's the last question that I have left on my homework assignment and it is due tonight at midnight. The car in the figure below travels a distance of 745 m along the track, and the driver finds that she has traveled through an angle of 475°. What is the...

As an analogy think about telling someone the story of your childhood and growing up and organizing it in episodes that depend either on how old you were or how big you were, when whatever it was happened---your family moved to a different town, you made some new friends, you started doing...

So I am a Chemistry major, but am behind on my math (was a Biology major but switched because I decided I would rather minor in Biology so as to avoid the boring plant and evolution/ecology stuff, plus I love Chemistry lol) and so am only taking calculus II this coming semester. My adviser wants...

Last month my sister and I were driving down a Maine highway to visit relatives up North. As we were chatting, I saw a perfectly straight, narrow, luminous line appear momentarily in front of the tree line (on the order of 100 meters away). It lasted just long enough to see and then it was...

Homework Statement A car on the frictionless track starts from rest at height h. The tracks valley and hill consists of a circular-shaped segments of radius R. What is the maximum height h from which the car can start so as not to fly off the track when going over the hill? Give your...

Hi there, I'm deeply ignorant about physics, but I'm curious about what conserved quantities (if any) are transferred from a section of railroad track to a train that's rolling along the track. I take it that in many situations if the track were absent, the gravitational attraction between...

Hello everyone, I am a new member here. Nice place you have; I have been reading on here again and again and figured it would be the right place to ask you about a problem I just can't get sorted out myself. It is about bicycles and disc brakes. I have an aluminum track frame that I want a...

Homework Statement Can anyone explain the above concept in a concise manner? I am proposing that banking aids motion at maximum speed on a curved surface. I am not totally sure how to include the role of side friction and centripetal force. Any further suggestions would be appreciated...

Homework Statement Two carts 'a' and 'b' are floating on a frictionless air-track and are stationary. 'a' is three times the mass of 'b'. They are being held together and there is a spring between them. The carts are released. Describe what happens after the release. Homework Equations...

Homework Statement integrating x^3lnxdxHomework Equations The Attempt at a Solution i let u = lnx du/dx = 1/x xdu = dx x=e^u substituting that, i got e^(4u)udu then i let v = 4u dv/du = 4 1/4du = dv substituting that, i got 1/4integral e^v vdv I haven't gone beyond that step yet. I was...

Homework Statement i = 15 sin(100π.t + 0.6) a) I need to state the initial phase angel in rads and degrees. b) I also need to work out current at first maximum value.Homework Equations i=A*sin(ωτ+∅)The Attempt at a Solution a) ∅=100∏*0+0.6 ∅= 0.6 rads. ∴0.6*180/∏=34.37746771° b) first current...

I'm nearing the end of my first year and registration for fall term is in two weeks. My problem is I don't really know what (branch, field, specialty? not sure what to call it) I want to pursue. When I choose my major I picked electrical engineering with a vague idea that I liked working with...

Homework Statement A child slides down a curved playground slide that is one quadrant of a circle of radius R. If he starts from rest and there is no friction, find his speed at the bottom of the track. (the motion of this child is exactly the same as that of a child on a swing of length R...

So I have been a "sheep" for most of my adult life, working whatever jobs were available straight out of high school. I never had any interest in the sciences or most anything else because I didn't think it was a practical goal to achieve. I always thought that to be a Physicist, you had to be a...

Homework Statement A block of mass m is initially held in place on the left side of a track at a distance h above the bottom of the track. The track is completely frictionless, with the exception of a rough horizontal section of track of length h which has a coefficient of kinetic friction μ...

Homework Statement So there are 2 questions i need help with. 1. Divide the room (for the rest of this valdation) into four (4) quadrants labeled Top Left (TL), Top Right (TR), Bottom Left (BL), and Bottom Right (BR). Which of the four particle tracks indicates that the B field in the TL and...

Homework Statement Let a(1)=a(2)=5 and a(n+1)=a(n)+6a(n-1), n≥2 Use induction to prove that a(n)=(3^n)-(-2)^n for n≥1 Homework Equations Not applicable The Attempt at a Solution I have check that a(3) = 5+6·5 = 35 = 3^3-(-2)^3 so it holds for n = 3. The cases n = 1 and n = 2...

Homework Statement Three boxcars are rolling along a virtually frictionless track at 20m/s when they strike another boxcar sitting motionless on the track. what is the new speed of the 4 coupled bovcars? all the boxcars have the same massHomework Equations 3rd or 2nd Newton lawThe Attempt at a...

Homework Statement From point A, the marble rests at the height of 0.895 m. Then, it is released up to point B which has a height of 0.665 m. From point B to point C, the marble falls in a projectile motion. Calculate the Kinetic Energy on position B and the work done by friction from...

I'm trying to understand a problem someone gave me recently. there is a frictionless track that initially starts flat then there is an incline of 20 degrees then it levels out again at the bottom of the incline. you have two masses, 1 is .4 kg and is located at the top of the hill and has an...

Hi all--Thanks for any help you might be able to provide, I've been lurking in the forum for a while and find everyone's comments to be extraordinarily helpful. Homework Statement The spring with a constant 103N/m launches a marble (m=5 g, r=.5cm) on a horizontal track with a loop (like a...

Homework Statement there are 13,200 components that must be regularly maintained or else they fail. At the end of month “t”, there are is a state vector describing the components given by Vt = [ft, mt, at]T where ft is the number of failed components, mt is the number of components out...

Small block on a track - Finding Normal forces and... Homework Statement Here is the question. Can someone please help, since I missed the section of class that went over this, any my textbook does not cover this well. Look below at question 1, a) and b) Homework Equations...

The problem statement A race-car is driving on a circular track, and above a particular speed, the race-car may flip over towards the outside track (inward wheels lift). Frictional force is present. The distance of the center of mass from the ground is L, the distance between the wheels is 2d...

Homework Statement A circular automobile racetrack is banked at an angle X, to the horizontal, such that no friction between the road and tires are required when a car travels at 30.0 m/s. The radius of the track is 400m. What is the angle? The problem i have is setting up the problem. I...

I need to experimentally find gravity using information from a lab we finished last week. Should I not be getting 9.8 m/s² at each angle or am I doing something wrong? And if I should indeed be getting ≈9.8 m/s² as my y-acceleration, can you point me in the right direction?

Homework Statement A runner travels 1,5 laps around a circular trackin a time of 50s. The diameter of the track is 40m and its circumference is 126m. Homework Equations a) Find the average speed of the runner b) Find the magnitude of the runner's average velocity. The Attempt at a...

1. I need to set up a lab. The goal is to find the force of friction between a track and a ball. The track is flexible and tilted so that it slopes down. Looking at it from the side, the track looks like half of a U. The ball is released from the top of the track and somehow I have to figure out...

Say I launch an object (a cart) up a frictionless inclined plane at an angle of 'theta' to the horizontal. Question: What would be the acceleration of the cart right after it is launched? My guess at the answer: 9.81*cos(theta) since the cart is launched at an angle. BUT I'm not sure...

Hey You may have seen the mosquito killing laser system from the intellectual ventures lab. In the description of the system they say the zoom camera identifies an object (mosquito) and from that they are able to direct a green laser on it and track it. What I am wondering is how the...

Homework Statement A runner completes 6 1/2 laps around a 400m track during 12min reun test. What is the runners displacement at the end of the 12 min? Homework Equations The Attempt at a Solution Well the distance covered is 2.6km or 2600m in 720s, avg speed = 3.61m/s So I...

Homework Statement I know this is basic but I'm stumped Homework Equations a runner runs 6.5 laps around a 400m track, what's the displacement. I thought it would be 200m but the answer provided says 160m and I just can't work out how to get to this answer The Attempt at a Solution

So I applied for the engineering college and they rejected me even though I have a 3.9 gpa and all the classes required for admission. They made it sound like the college is full because they can't even accept me as a undecided engineering major. I'm freaking out a little bit because next...

Do most wrecks in automobile racing start at the singularities of the track - e.g., where the straight path becomes circular? Might this likewise be true of road driving?

Homework Statement A toy car of mass 0.300 kg is shot out of a compressed horizontal spring (A), and then travels around a loop-the-loop along a frictionless track. The spring has a spring constant k = 900 N/m, and 3.50 J of energy was stored in the spring by compressing it. (1) How far was...

Why is it often a faster way around a dirt track to slide around turns? The simplistic view that I got from Physics 101 says that the static friction coefficient is always higher than the sliding friction coefficient. So, that view would imply that a vehicle would be able to go around a turn...

Homework Statement The sequence a0 -> n is defined by ai = b+i*c. Prove by induction on n that the sum of the terms in the sequence is (n+1)(a0 + an)/2.Homework Equations The Attempt at a Solution I defined predicate P(n) as (n+1)(a0+an)/2. My goal is P(n+1), which is (n+2)(a0+an+1)/2. I...

Homework Statement A toy train rolls around a horizontal 1.8 m diameter track. The coefficient of rolling friction is 0.11. What is the magnitude of the train's angular acceleration after it is released? How long does it take the train to stop if it's released with an angular speed of 31 ...

1. The problem statement A 10 kg block is released from point A on a track ABCD. The track is frictionless except for the portion BC, of length 6 m. The block travels down the track and hits a spring of force constant k = 2250 N/m and compresses it a distance of 0.3 m from its equilibrium...

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...

I am working on a design that requires a slider that is heavily loaded in track. The slider must be able to translate along the track while loaded. The track is not extremely stiff therefore there will be some deflections. Does anyone know of any design guidelines for designing such a joint...

Determine mass of a glider on an air track [solved] [SIZE="1"]Homework Statement A 20.0 g mass is stringed to a glider on an air track through a pulley (https://www.physicsforums.com/attachment.php?attachmentid=30478&stc=1&d=1291794499"). I'm supposed to find the mass of said glider...

We have a force which changes according to what point you're at, e.g: f=(4x²,3z-2y,2z), we need to calculate the work done by this force from point (0,0,0) to (2,1,3) on different curves I don't want an answer I just want an explanation for how this is done, this is what I understand so far...

Homework Statement A car traveling on a flat circular track of radius 5m accelerates uniformly from rest with a tangential acceleration of 1.7m/s^2. The car makes it 0.2 of the way around the track before skidding off. Acceleration of gravity=9.8m/s^s. What is the coefficient of static...

Homework Statement What is the minimum speed of the car must have at the top of the loop? There are three methods. I would like to know which method or answer is correct. Please see attached file. Homework Equations Please see attached file. The Attempt at a Solution Please...

Homework Statement If the speed of a roller coaster at the bottom of the loop is 25 m/s, what is the normal force exerted by the car by the track in terms of the car's weight mg? Homework Equations N - mg =mv^2/r The Attempt at a Solution N=mv^2/r + mg N=m(v^2/r+ g) N=m (31.25...

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...