Centripetal force Definition and 558 Threads

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 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...

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...

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...

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.

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 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 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...

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...

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...

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...

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 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?

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...

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...

"A plumb bob does not hang exactly along a line directed to the centre of the Earth's rotation. How much does the plumb bob deviate from a radial line at 35 degrees north latitude? Assume the Earth is spherical." I found the radius of the Earth and rotational velocity at the equator via...

Homework Statement http://img.skitch.com/20091201-pxecs3d574itggpejybhdbp3qr.jpg Essentially, as an experiment, our physics class whirled a stopper attached to a string that went through a tube that was finally attached to a weight on the bottom of the string. The Attempt at a Solution...

Homework Statement A body can move in a circle at a constant speed if a. there is an unbalanced radial force directed inwards. b. inward and outward forces are equal in magnitude c. the net radial forces equal the net tangential forces d. all the statements above are correct e. none of...

Homework Statement We had an experiment where you have two masses on either side of a string and you swing one in a circle,while the other hangs vertically down(providing Fg). "When you swing the mass in a circle, your hand most likely moved in a small circle. What effect does this have on...

Homework Statement A ball of mass M is attached to a string of length R and negligible mass. The ball moves clockwise in a vertical circle. When the ball is at point P, the string is horizontal. point Q is at the bottom of the circle and point Z is at the top of the circle. Air resistance is...

I'm having trouble with circular motion, for the simple reason that my instructor taught it differently than my book explains and how I see it done online. He explains that centripetal force moves towards the outside of the circle, and is an independent force. Meaning, he explains it as a force...

Sorry if this is posted in the wrong area, I am relatively new. Circular Motion Lab is set up like this to study circular motion...

What is the relationship between the mass and velocity of a whirling object? base of graph relationship What is the relationship between the radius of revolution and the velocity of a whirling object? What is the relationship between the velocity of a whirling object and the centripetal...

Homework Statement How do I find the direction of the centripetal force and acceleration? Homework Equations mv^2/r - centripetal force v^2/r - centripetal acceleration The Attempt at a Solution Would it be inward or outward the radius?

If I swing around a mass attached to a string, and then suddenly let go, the mass will fly off in a direction tangent to the circle it was swinging around. My question is, what will happen to the string? I know it will follow the mass on its tangental path, but how do we explain the behavior of...

Homework Statement Two identical twins, Jena and Jackie, are playing one December on a large merry-go-round (a disk mounted parallel to the ground on a vertical axle through its center) in their school playground in northern Minnesota. Each twin has a mass of 29.0 kg. The icy coating on the...

Homework Statement A swing ride at a carnival consist of chairs that are swung in a circle by 15.0 meter cable that makes a 60 degree angle with a verticle pole. The mass of the chair and the occupant is 179 kg. Determine the tension in the cable. Find the speed of the chair Homework...

Homework Statement hi guys i need help solvign the following problem. A mass 1kg on a frictionless table is attached to a hanging mass 4kg by a cord through a hole in the table. Find the frequency with which 1KG mass must move for 4kg to stay at rest, if the radius of the circle is 75m...

Homework Statement a. Draw a free body diagram for mass Mb while in motion (fig. 2a). Identify the centripetal force. assume that the mass hangs vertically b. Calculate the magnitude of the force exerted by the spring on mass Mb = 402g, moving in a circle of radius r=18cm (fig. 2a). The...

I have my own concept question. Ignoring air friction and mass of string, and only considering the motion of the bottom right quarter of a circle, where only gravity acts on the mass. Lets say I have a mass attached to a rope with length R. I hold the string in my left hand and the mass...

Homework Statement A roller-coaster vehicle has a mass of 510 kg when fully loaded with passengers (Fig. P7.28). http://www.webassign.net/sf/p7_28.gif (b) What is the maximum speed the vehicle can have at point B in order for gravity to hold it on the track? Homework Equations...

Homework Statement Consider the rear view of a bus turning right. If the driver turned the bus while traveling too fast, the bus could topple over. If the bus did topple would the bus fall to the left or to the right? Explain. Since the bus was turning to the right, the centripetal force...

Homework Statement A skater holds her arms outstretched as she spins at 225 rpm. What is the speed of her hands if they are 152 cm apart? The Attempt at a Solution I converted 225 rpm to 3.57 rps and found the angular velocity (23.56 rad/s) to plug into the equation v=wr, but it didn't...

Homework Statement A) An amusement park ride consists of a rotating circular platform 10.8 m in diameter from which 10 kg seats are suspended at the end of 2.34 m massless chains. When the system rotates, the chains make an angle of 29.4◦ with the vertical...

Hi, thanks in advance for any help and info. Have two conditions. The first condition is a mass of water spinning as a fixed mass. Say we have a rectangular mass .25 inches tall, 2 inches long and .50 thick spinning at 3000 RPM with its center of mass at R = 2.00 inches. (Please see first...

Homework Statement I never thought I would have this kind of elementary problem consider a string closed-loop spinning around an axis, and its shape is a circle, I wanted to find the centripital force at each point. (uniform density is assumed). I have problem expressing the mass...

Centripetal Force / Tension / Speed (HELP!) Homework Statement A 100 g bead is free to slide along an 80 cm long piece of string ABC. The ends of the string are attached to a vertical pole at A and C, which are 40 cm apart. When the pole is rotated about its axis, AB becomes horizontal...