Centripetal Definition and 1000 Threads

It seems that centripetal acceleration should be in the same direction as the velocity vector. Why is it directed into the center of the circle. I remember walter lewin talking about a marble inside a glass test tube. Imagine the marble inside of it and I swing the test tube like a baseball...

Homework Statement I did a lab where there was a glass tube with a rubber ball attached and a string hanging from the glass tube with metal washers attached at the bottom. My question is if the ball were to hang too low why would the centripetal force be less accurate is it because there...

when we travel around a circular path we exert force on the path(ground)can be considered centrifugal force and petal which acts inwards,as a reaction to it...it violates the rule that force of centrifugal is pseudo force... then what exactly is centrifugal force who gave this concept??seeing...

Hi, I'm working on a paper about the problems with standardized testing. On a recent test that I took there was one problem that I thought could demonstrate one of the problems with standardized testing, multiple answers to a single question based on interpretation, and I thought I might use it...

Homework Statement A small block of mass m = 5kg slides along the frictionless loop-the-loop track shown in the figure. R = 2m a) If it starts from rest at P, what is the resultant centripetal force acting on it at Q? b) At what height from the bottom of the loop should the block be...

I need to find the average centripetal acceleration, I know the equation is aR= v^2/r but I am not given the radius only speed and time

Homework Statement prob1) For a car traveling with a speed v around a curve of radius r, determine a formula for the angle at which a road should be banked so that no friction is required. prob2)Calculate the frictional force needed for a 900kg car traveling around a 500m radius curve at...

Homework Statement So I'm doing a lab of examining circular motion and centripetal force. My results came out to be that as Fg increases, Fc decreases. My question is if this relationship between Fg and Fc is logical and why? The experiment was conducted in a way that a ball was attached to a...

Homework Statement A particle moves in a circular path of radius r with speed v. It then increases its speed to 19v while traveling along the same circular path. By what factor has the centripetal acceleration of the particle changed? Homework Equations ac=v^2/r The Attempt at a...

Hi I've been working through some examples from the course material we use in physics class, but one thing keeps confusing me: What is the difference between centripetal and radial acceleration? For instance, when we have a particle traveling in a circular path, the acceleration towards...

1. In a certain binary-star system, each star has the a mass of 1.36e30 kg, and they revolve about their center of mass. The distance between them is 1.1e8 km. What is their period of revolution in Earth years? 2. gravity = centripetal force (g*m*m)/d^2 = (mv^2)/r 3. I've tried plugging in...

Homework Statement The international space station(iss) is in orbit about 487KM above the surface of the earth,completing one lap(orbit) around the planet every 92 minutes. Determine the mass of the ISS in tonnes(103kg) The diameter of the Earth is 12756.32 km at the equator. Homework...

Considering Earth spins there is a centripetal force acting on us. How much force is acting on us? Say a 1Kg weight? Can someone give me an equation? Is it significant? I was wondering if land racer would be noticeably lighter or heavier if traveling in one direction or another at 700mph due to...

My question is how can Ac (centripetal acceleration) be both inversely related to radius and directly related in two equations: 1) Ac = V2/r 2) Ac = 4pi2r/T2 In the first equation Ac is inversely proportional to radius in the second one Ac is directly proportional to radius. Why and how is...

I'm having trouble grasping the concept of centripetal acceleration on circular motion. I understand angular velocity. From there what my books gives me is the centripetal accel formula. a[SIZE="1"]c=(v^2)/R I don't notice any acceleration in a circular motion. Nothing's accelerating. What...

Homework Statement A car traveling on a flat (unbanked), circular track accelerates uniformly from rest with a tangential acceleration of a. The car makes it one quarter of the way around the circle before it skids off the track. From these data, determine the coefficient of static friction...

Homework Statement Two 4.40 kg blocks of negligible size are attached to the middle and end of a thin, massless, wire that is 260 cm long. The blocks are rotating horizontally on a frictionless horizontal surface. The free-end of the wire is attached to a pivot, and the system is rotated in...

As a homework question, it asks, "...if the Earth were rotating so fast that the objects at the equator were apparently weightless?" Somewhere, someone said that, quote: In order for the rotation of the Earth to cancel weight, the gravitational field strength should equal the centripetal...

First of all, the situation is as follows : A girl is swinging a bucket filled with water, and she is whirling it around in a vertical motion. When the bucket is at any other position on the circumference of the circle, everything seems fine and intuitive. But an interesting thing...

I'm having trouble solving the following problem: An 80cm string with a mass attached to the end is rotated at a rate of one revolution per second. Assuming the force of gravity is 9.8 m/s^2, what is the angle made with the vertical by the string? [My words, but these were all the variables...

Hi my name is Daniel and i am very much interested in the many different concepts of physical science. I have been studying entry level physics at my local university for about 6 months now, however i am looking for a definitive answer to a question i have about centripetal acceleration...

Homework Statement What is the magnitude of the centripetal acceleration of a point on the circumference of a 0.32m radius bicycle wheel rotating at 22 rad/s ? Give your answer in metres per second squared Homework Equations To be honest I am stumped I have no idea The Attempt at...

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 I'm having a hard problem conceptualizing this. It states that an object with a certain Mass M is being spun in a vertical circle. The object attached to a rope, and the object moving in circular path with constant radius. It also give you the velocity of the object. It asks...

Homework Statement A 2500 kg car starts from rest and travels along a circular track with a radius of 55.0 meters. The car starts out at a position due East of the center of the track, heading due North initially around the track, which is counterclockwise. The car increases its speed by 105...

Homework Statement What is the centripetal acceleration of the Moon? The period of the Moon's orbit about the Earth is 27.3 days, measured with respect to the fixed stars. The radius of the Moon's orbit is RM = 3.85 · 108 m. Homework Equations a = V^2/R V = 2*pi*R/P The Attempt...

Homework Statement There is a loop-the-loop, thing, and a dude on a bicycle is going to ride around the loop. Total mass is 1 kg (I'm aware that isn't realistic at all...) and radius is 10 meters. a) what is the minimum speed that the cyclist must have to make it over the top of the loop...

Homework Statement #1 The drawing shows a baggage carousel at an airport. Your suitcase has not slid all the way down the slope and is going around at a constant speed on a circle (r = 14.0 m) as the carousel turns. The coefficient of static friction between the suitcase and the carousel is...

Homework Statement Hi. I have this problem: A particle of mass m, rests on top of a frictionless sphere of radius R. Admitting that part from the rest for the position indicated in the figure along a path contained in a vertical plane. Get the value of the angular coordinate at the instant...

Homework Statement A 2.1 kg mass is connected to a spring with spring constant k=150 N/m and unstretched length 0.18 m. The pair are mounted on a frictionless air table, with the free end of the spring attached to a frictionless pivot. The mass is set into circular motion at 1.4 m/s. Find...

Hello everyone When do you use -v^2/R instead of positive v^2/R for the acceleration in circular motion? Thanks. Stephen

Homework Statement When a car is speeding over a curved surface e.g a bridge, it sometimes loses contact with the ground. We have seen this many times in high speed chases and rally driving. In this scenario, the textbook wrote this equation: S-mg =Mv^2/r The RHS side is obviously the...

Homework Statement Okay, so the problem is I need to find the radius of curvature for a proton moving through a uniform magnetic field with initial velocity v for some distance d and exiting at angle θ. I was able to get the correct answer; however, I think the apparent assumption made by the...

Homework Statement I)The mass of the moon is 7.35*10^22 kg. In inertial coordinates, the moon orbits the Earth in 27.3 days at an average distance of 3.84*10^5 kg. Calculate the centripetal force on the moon. II)The mass of the moon is .0123 times that of earth. Since the Earth is...

Hi, how can I determine the tangental acceleration of a circle needed to produce a given centripetal acceleration from a range of radii? For example, I would like to produce 9.81 m/s/s centripetal acceleration with a range of radii from 5km to 100km? All I really need is to figure out the...

1. The astronaut orbiting the Earth in Figure P4.30 is preparing to dock with a Westar VI satellite. The satellite is in a circular orbit 600 km above the Earth's surface, where the free-fall acceleration is 8.21 m/s2. The radius of the Earth is 6400 km. a) Determine the speed of the...

Good afternoon, For a body in a curvilinear motion moving with velocity \vec{v}, velocity can be divided into two components (see http://en.wikipedia.org/wiki/Angular_velocity#Two_dimensions" Wikipedia article): a component parallel to the position vector (the radius), which changes the...

1. (a)The speed of the tip of the minute hand on a town clock is 0.00136 m/s. What is the speed of the tip of the second hand of the same length? Answer in units of m/s. (b)What is the centripetal acceleration of the tip of the second hand? Answer in units of m/s2. Homework...

A car starts from rest and travels along a circular path of radius 200 m. The magnitude of its velocity increases at a rate of 2 m/s After 10 s, what is the magnitude of the acceleration of the car (in m/s my attempt: v = 10*2 = 20m/s would the acceleration that the car's...

Homework Statement You plan to throw stones by using a sling of length 1.6 m which you whirl over your head. Suppose you wish to throw a stone a distance of 32 m. What must be the centripetal acceleration of the stone just before its release if it is to reach this distance? Assume that the...

I'm not getting very far with these problems. Don't know what my problem is. Given a circular orbit, the centripetal acceleration is given by the gravitational force between the two stars. I chose the center to be halfway between the stars d/2...

[b]1. The aim of the lab is to verify the centripetal acceleration law which states that acceleration is equal to the velocity squared divided by the radius. During the lab, we spun a string powered whirligig. There was a ball at the top, attached to string, the string was threaded through a...

Homework Statement From Tipler's Physics for Scientists and Engineers(the latest edition) 71.Human blood contains plasma, platelets, and blood cells. To separate the plasma from other components, centrifugation is used. Effective centrifugation requires subjecting blood to an acceleration...

Homework Statement A 25 kg child is on a swing, which has a radius of 2.00 m. If the child is moving 4.0 m/s at the bottom of one swing, what is the centripetal force exerted by the ropes of the swing on the child? What is the total force exerted by the ropes when the swing is at its lowest...

Homework Statement A particle starts from rest at t=0 s. It moves along a circular path of radius 18m and has an acceleration component along its path of 4.3m/s^2. What is the magnitude of the acceleration when t=3 s? Homework Equations N/A The Attempt at a Solution I am...

Homework Statement A 55.5 kg ice skater is moving at 4.02 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.807 m around the pole. (a) Determine the force exerted by the horizontal rope on her arms. (b) Compare this...

Homework Statement (a) What is the tangential acceleration of a bug on the rim of a 8.0 in. diameter disk if the disk moves from rest to an angular speed of 77 rev/min in 3.0 s? (b) When the disk is at its final speed, what is the tangential velocity of the bug? (c) One second after the bug...

find ω given centripetal acceleration Homework Statement It has been suggested that rotating cylinders about 9.0 mi long and 6.4 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the...

A highway curves to the left with radius of curvature R = 46 m. The highway’s surface is banked at θ = 26 so that the cars can take this curve at higher speeds. Consider a car of mass 1018 kg whose tires have static friction coefficient µ = 0.57 against the pavement. The acceleration...

Homework Statement a 1000kg car negotiates a banked friction free track or radius 25m with speed 30m/s to what angle to the horizontal is the road banked? Homework Equations The Attempt at a Solution tried to calculate the normal force of the car, to find the angle between the...