Centripetal Definition and 1000 Threads

During revision for an exam I have tomorrow I came across a question that left me confused, and I wasn't entirely satisfied with my teacher's explanation today. I'm worried something of the sort may come up in the exam and I won't be entirely certain how to deal with it. We have a plane...

Hello everyone, I have got confused with this. Normal the friction force acts to cancel the force. If I travel with 10 N force and friction is 5N, I travel at 5N. Why is that when you make a turn they don't create a net force, but act as separate forces?

[b]1. The table below lists the average distance from each planet to the Sun and the time each planet takes to make a complete orbit around the Sun (“Orbital period”). The orbits of all of the planets are roughly circular. Your job is to determine a relationship between the radius r of a...

Centripetal accelerations with two parallel axes -- the "Scrambler" Homework Statement This should be a pretty quick and straightforward question to answer. The problem regards centripetal forces on an object rotating simultaneously around two parallel axes, like in the "Scrambler" amusement...

Homework Statement A certain spherical planet which is not rotating has a radius of 6.36 x 105 m and a mass of 1.89 x 1021 kg. At what minimum speed would a vehicle traveling along its surface just begin to leave the ground? Homework Equations FC = mv2/r FG = GMm/d The Attempt at a...

Homework Statement An airplane is flying in a horizontal circle at a speed of 141 m/s. The 94.2 kg pilot does not want his radial acceleration to exceed 8.88g What is the minimum radius of the circular path? Homework Equations v^2/r The Attempt at a Solution 141^2/.00888 kg

Homework Statement An Airplane is flying ina horizontal circle at a speed of 141 m/s. The 94.2 Kg pilot does not want his radial acceleration to exceed 8.88 g. What is the minimum radius of the circular path? Homework Equations v^2/r Fnet = M x A The Attempt at a Solution 141^2 / .00888 kg?

Homework Statement An object orbits the Earth at a constant speed in a circle of radius 6.38 x 106 m, very close to but not touching the Earth's surface. What is its centripetal acceleration? Homework Equations a = v2/r = 4\pi2v/T2 v = 2\pir/T The Attempt at a Solution I plugged in...

Homework Statement An individual standing at the equator: a)What is this individuals centripetal acceleration caused by the Earth's rotation? b)How fast would the Earth need to spin in order for the centripetal acceleration to be equal to g? T=1 day radius of Earth = 6.4x10^6 m...

Homework Statement A truck with a mass of 20000kg goes around a circular path with a speed of 50km/hr. If the radius is 105m. Calculate the centripetal force acting on the car. Homework Equations This is why I can't get the answer to this question. I don't know which equation to use. I'm...

certain neutron stars rotate at about 1.0 revolutions per second. If such a star has a raduis of 20km, what minimum mass must it have so that material on its surface doesn't fly off during the rapid rotation? ive tried working out the centripetal acceleration, being 7.89 X10^8 then subbed...

Looking on the internet, it seems to very difficult to find a simple straightforward statement of the equations for relativistic centripetal force. This is my point of view and hopefully with some feedback we can come to a consensus. Consider a test mass moving in a circle with radius r. The...

Homework Statement Suppose a string of negligible mass can support a mass of .025 kg when hanging vertically. The string is 4.23 m long (radius). If you add another weight and spin the string horizontally in a circular pattern above your head, the string will break upon reaching a tangential...

Homework Statement A satellite is orbiting the Earth in a stable orbit of which the radius is twice that of the Earth. Find the ratio of the satellites cepripetal acceleration to g on the Earth's surface. Homework Equations centripetal acceleration = (v^2)/r or (4rpi^2)/T^2 The...

Ok, here's a question I've been worrying about recently: If you were to be rotated about your waist, at what rotational rate would your body begin to tear apart, specifically decapitation? Basically, I've been doing lots of gainers (running back-flips) and I'm concerned that if I get...

Homework Statement A stone of mass 4 Kg is attached to a string , its length 10 m .it moves in a horizontal circular path. The tension force of the string becomes 160 N then calculate its velocity. The Attempt at a Solution Its quite easy to solve when supposing the tension force =...

Hello guys, It is hard for me to explain my question so I'll use a diagram Consider plane velocity - As centripetal force Wind velocity- As the velocity of object at the start R- As the resultant velocity So in the centripetal force objects this resultant velocity seems constant...

Hello, I would like to know how to calculate the velocity of an object in a circular path, accounting for friction. I know that in a frictionless environment, the equation for the velocity is v2=F*R/M.

Homework Statement A washing machine's two spin cycles are 328 rev/min and 542 rev/min. The diameter of the drum is 0.43 m. What is the ratio of the centripetal accelerations for the fast and slow spin cycles? Homework Equations ac=v2/r linear velocity: v=rw (w is really omega) angular...

Hey guys, I could not understand this question. There weren't enough givens for myself to understand how to get the period. 1. Earth and the Moon are separated at their centres by a distance of 3.4x10^8m. Determine the period of the Moon's rotation about Earth. 2. mv^2/r=Fc 3. I...

Hello guys, I wasn't interested in these stuff those days and I never got it. Now when you do a car turn the friction from the tires provide the centripetal force right. I have few quick questions. How does the friction from tires give a force in the centripetal direction, how come it...

Homework Statement what are the units of the slope of a velocity^2 vs. centripetal force plot? and why should the line pass through the origin?Homework Equations The Attempt at a Solution I'm getting m/km for units but I'm not sure what that actually means so I don't know why it should go...

A 2.4 x 103 N force is necessary to keep a car and driver moving at a speed of 100 km/h through the middle of a highway curve that has a radius of 350 m. What is the mass of the car and driver? Im really confused on this question, I was told the formula should be something like FC=MV^2...

Homework Statement A certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 32.0 m/s. With what maximum speed can it go around a curve having a radius of 75.0 m? Homework Equations Fc = m(v^2/r) Fc = net centripetal force m = mass v = tangenital speed r...

Homework Statement I had to do a lab, the diagram of which is shown. The radius (r) of the string was 50.0 cm, and our first mass was 29.0 g. The time for 20 trials was 15.75 s. We repeated the process with five other masses and recorded all the same information. Then, we had to plot the...

Homework Statement http://www.screencast.com/users/trinhn812/folders/Jing/media/e79a7b88-f71e-4790-a35c-7bc0c3e03ec8 Answer key is marked Homework Equations F=gMm/r^2 =ma=mv^2/R The Attempt at a Solution So does gMm/r^2 also measure centripetal acceleration?

http://img517.imageshack.us/img517/4817/aholelol.png http://img532.imageshack.us/img532/881/bridgelol.png There are 2 images. Let a[SIZE="1"]c be the centripetal acceleration vector and v the speed vector. Now are my drawing right or have I gotten this whole thing wrong? My teacher...

Homework Statement A 0.10 kilogram solid rubber ball is attached to the end of an 0.0 meter length of light thread. The ball is swung in a vertical circle. point P, the lowest point of the circle, is 0.20 meter above the floor. The speed of the ball at the top of the circle is 6.0 meters per...

Homework Statement A race car starts from rest on a circular track. The car increases its speed at a constant rate at as it goes 2.25 times around the track. Find the angle that the total acceleration of the car makes with the radius connecting the center of the track and the car at the moment...

Here is the problem and the choices: Calculate the centripetal force exerted on the Earth by the Sun. Assume that the period of revolution for the Earth is 365.25 days, the average distance is 1.5 × 10^8 km and the Earth’s mass is 6 × 10^24 kg. The choices are: 1. 3.56775 × 10^22 N 2...

http://cache.rcdb.com/pictures/picmax/p5740.jpg I am doing an analysis on a roller coaster that is represented on the diagram attached. However, I am having trouble analysing the curve. The radius is 36.9m and it is 160km/hr going up and then it free falls back down from 115m for about three...

can someone justify why centripetal acceleration = v^2/r? And I'm not asking about algebraic proof.

so when we light 2 candles and put them on the edge of a bike tire and we spin the bike tire the candle flames lean in towards the center. And we put a glass chimney around the candles to protect the flames but the top is open . like seen here around the 4.5 minute mark in this video. . I...

So I am building this program for fun. I thought I would combine some different elements of basic physics into it. I am letting people place in numbers to create a custom planet (radius, gravitational acceleration, rotation speed (tangential velocity?). Anyway, I ran into an issue. I want...

1. A roller-coaster car has a mass of 1290 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 20 m, its speed is not changing. (a) At the top of the hill, what is the normal force (using the negative sign for the downward direction) FN on the car...

Hi there, sorry if this is not in the right section, but i have to do an investigation, i have chosen to prove f=mrw2. I will be using a rotational air table, and this the handheld whirly string and mass experiment - sorry to be vague. basically i am not the best physicist so i would very much...

Homework Statement A special electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop at an amusement park. The sensor measures the magnitude of the normal force that the seat exerts on a rider. The loop-the-loop ride is in the vertical plane and...

I have questions about the deduction of law of centripetal force http://img42.imageshack.us/img42/5841/centripetalforce.gif Why do we assume that the change in direction of velocity of the object is V(t+dt) And similarly the change in direction of radius? Also what is the triangle of...

hello to all, first post on this side of the web, maybe some of you folks can give me an opinion on something I've been running in my head ok, so this stemmed from thinking about how to overcome lenz law with gravity i thought of a magnet on the end of a lever, with a free standing...

Mass on a string undergoing uniform circular motion by hand: I was taught that the centripetal force F = mV^2/R is a resultant force, and in this case was due to the tension force by the wire on the mass. I am trying to understand what is causing the tension and what causes the string to break...

Hello, I was trying to do this problem and then I looked at the solution manual and found something that confused me. I am having trouble distinguishing between centripetal and radial acceleration. According to the equation in the book a_r=-a_c, which kind of confuses me. Isn't a centripetal...

Homework Statement You are designing a centrifuge to spin at a rate of 15,300 rev/min. (a) Calculate the maximum centripetal acceleration that a test-tube sample held in the centrifuge arm 14.7 cm from the rotation axis must withstand. 377361.36 m/s2 (b) It takes 1 min, 16 s for the...

Just had a question in an exam asking me to find the centripetal force of a capsule on a ride like this: It gave the mass of a capsule, its velocity and radius etc. Would I have had to multiply by the number of capsules, because it did state the number. I didn't do this, but someone told me...

Hi, I understand how centripetal force works and all. But I still don't understand, when looking at a satellite orbiting the Earth, the only force acting is its weight, which is in the direction of the Earth. How does its circular motion start in the first place? If the only force there is is...

The centripetal acceleration of a person standing at the equator is about 0.03 m s–2. (Radius of the Earth = 6.4 × 106 m.) The size of the force R provides a measure of the apparent strength of the gravitational field. Show that the apparent field strength g at the equator differs from...

The centripetal force is caused by: Friction between seat & person or push of capsule wall on person. How come the answer is not the Tension in the cable?

A ceiling fan is turning at a rate of 100 revolutions per minute. A spider is clinging to a blade. If he experiences a centripetal acc greater than 0.3g, he wil lose his grip and be flung off. How far from the centre can he safely go? I used: T = 60/100 = 0.6 angular velocity = 2pi/T =...

Homework Statement A 2.0 kg stone is whirled in a horizontal circle on the end of a 2.1 m long rope. The stone travels around the circle 50 times each minute. What centripetal force is exerted by the rope on the stone? Homework Equations The Attempt at a Solution I've tried to...

Homework Statement Tetherball is seen on playgrounds across the globe. It consists of a vertical pole with a ball attached to the top with a rope. The ball has a mass of 1kg and is sent around the pole in a horizontal circular path. If the rope has a length of 2.25 meters and makes an...

Heres the question "A ball with a mass of 250 g has a centripetal acceleration of 5 m/s2. What is the centripetal force acting on this ball? " Since radius depends on the string length I have no idea how to derive it from these 2 variables. The only formula I know for getting centripetal...