Centripetal Definition and 1000 Threads

Homework Statement A 600 kg car is going over a curve with radius 120m that is banked at angle of 25 degrees with speed of 30 m/s. The coefficient of static friction between car and road is 0.3. What is the normal force?Homework Equations F(centripetal)= (mv^2)/r F(static) = Mu(normal force)The...

Homework Statement In a carnival ride, passengers stand with their backs against the wall of a cylinder. The cylinder is set into rotation and the floor is lowered away from the passengers, but they remain stuck against the wall of the cylinder. For a cylinder with 2m radius, what is the...

Homework Statement A box rests at a point 2.0m from the axis of a horizontal circular platform. The coefficient of static friction between box and platform is 0.25. As the rate of rotation of the platform is slowly increased from zero, at what frequency will the box first slide...

centripetal accel -- airplane flying in a horizontal circle... Homework Statement An airplane is flying in a horizontal circle at a speed of 116 m/s. The 77.0 kg pilot does not want his centripetal acceleration to exceed 6.00 times free-fall acceleration. (a) What is the minimum radius...

[SOLVED] "webassign" problem, CENTRIPETAL ACCEL Homework Statement The Emerald Suite, a revolving restaurant at the top of the Space Needle in Seattle, Washington, makes a complete turn once every hour. What is the magnitude of the centripetal acceleration of the customer sitting...

Homework Statement An object of mass M on a string is whirled in a horizontal circle. When the string breaks, the object has the speed v0, the circular path is radius R, and the height of the object above the ground is h. In terms of h, v0, and g, what is the time it takes for the object...

[SOLVED] help- speed Mass m_1 on the frictionless table of the figure is connected by a string through a hole in the table to a hanging mass m_2. With what speed must m_1 rotate in a circle of radius r if m_2 is to remain hanging at rest? i know i am suppose to show what i have done...

Homework Statement A race car travels at a constant speed on a circular track. The net force on the car is 1600N. What kind of force creates the acceleration? a) air resistance b) friction tangent to the circle c) friction toward the center of the circle d) friction away from the center of...

I'm doing problems modeling particles in uniform circular motion and one is about a car going over a speed bump. I figured out the problem, but then it asks "What is the max speed the car can have as it passes this highest point without losing contact with the road?" I'm not sure what this...

can some1 please explain centripical accleration? i don't get it at all

Homework Statement http://img147.imageshack.us/img147/7830/scan0001ym3.png The Attempt at a Solution A) i think force of Tension ... C) Normal Force Plz help me

Is there a way to measure centripetal acceleration independent of a force measurement? If I had just a ruler, and a ball was rolling along a circular path, could I 'measure' the centripetal acceleration itself, without resorting to finding the radius, period, etc. Someone once told me that this...

Two wires are tied to the 400 g sphere shown in figure. The sphere revolves in a horizontal circle at a constant speed of 8.30 m/s 1) What is the tension in the upper wire? 2) What is the tension in the lower wire? okay i know that m=.4 and v=8.3 i don't know r, which i thought that...

My mission: Find the force of tension in the rope supporting your flying pig. No joke. We have a pig with mass .1618 kg that is attached to a string of "negligable mass". It flies around from a supsended point in uniform circular motion. Using the radius and period I found, I got the...

Homework Statement how could one prove a relation between centripetal force and angular velocity? i have tried to find this in a search but nothing came up. Homework Equations Fc= mv^2/r The Attempt at a Solution i guess this involves some sort of substitution for velocity...

Homework Statement A centripetal-acceleration addict rides in uniform circular motion with period T = 6.12 s and radius r = 3.00 m. At one instant his acceleration is a = (1.00 m/s2) i + (-3.00 m/s2) j. At that instant, what are the following values? v.a and r x a Homework Equations T...

Homework Statement David used a sling to kill Goliath. The mass of the rock was 2.5 kg and the sling had a length of 1.2 m. If it spun horizontally 2 m above his head 7 times in 3 seconds: a. What was the launch velocity? b. What is the centripetal force and tension? c. How far is David...

Homework Statement this is a three part question (this i just a general thing for equations without numbers) for an object (the same as explained on this link: https://www.physicsforums.com/showthread.php?t=167283) but the string is not quite horizontal i.e. the r will be r cos theta because...

I'm in the Rotational Motion Chapter. After torque is applied to rotate an object,how do I go about breaking down the tangent vector and the centripetal force vector? What I want to know is how the torque is being divided between the tangent direction and the radius direction.

Homework Statement On your first day at work for an appliance manufacturer, you are told to figure out what to do to the period of rotation during a washer spin cycle to triple the centripetal acceleration. You impress your boss by answering immediately. Express your answer in terms of T...

Homework Statement A bicyclist travels in a circle of radius 25.0m at a constant speed of 9.00 m/s. The bicycle-rider mass is 85.0 kg. Calculate the magnitudes of a) the force of friction on the bicycle from the road and b) the net force on the bicycle from the road. Homework Equations...

The question is: "In an automatic clothes dryer, a hollow cylinder moves the clothes on a vertical circle (radius r=0.32m). The appliance is designed so that the clothes tumble as they dry. This means that when a piece of clothing reaches an angle of \theta above the horizontal, it loses...

Hi can someone help me on this problem. a cat dozes around merry go round at radius 5.4 meters. the ride turns on and brought up to turning rate of 7.2 seconds in one complete rotation. how do i find the least static friction coefficient between the cat and the merry go round that will...

Homework Statement In a test of a “g -suit,” a volunteer is rotated in a horizontal circle of radius 7.7m. What must the period of rotation be so that the centripetal acceleration has a magnitude of 3.7g ? What must the period of rotation be so that the centripetal acceleration has a...

I derived the (magnitude of ) relativistic centripetal force mv^{2}/R[1-(v/c)^{2}]^{3/2} but my few books don't even mention relativistic centripetal force. Can someone corroborate this?

Car negotiating a banked curve -- centripetal force We were asked to calculate the optimum (no friction), maximum, and minimum speeds alowed for a car making a banked curve. I calculated the optimum and maximum velocities using the provided angle, radius, and coefficient of static firction...

Homework Statement (a) What is the magnitude of the centripetal acceleration of an object on Earth's equator owing to the rotation of Earth? (b) What would the period of rotation of Earth (in minutes) have to be for objects on the equator to have a centripetal acceleration with a magnitude of...

A ball on the end of a string is whirled around in a horizontal circle of radius .487 m. The plane of the circle is 1.06 m above the ground. The string breaks and the ball lands 2.26 m away from the point on the ground directly beneath the ball's location when the string breaks. The...

Homework Statement A computer is reading data from a rotating CD-ROM. At a point that is 0.0244 m from the center of the disk, the centripetal acceleration is 283 m/s2. What is the centripetal acceleration at a point that is 0.0856 m from the center of the disc? Homework Equations Ac =...

I have to explain the argument, why the centripetal force must be radial and towards the centre, rather than away. I have just started circular motion and have no idea how to explain this sort of thing, I don't even understand the question!

Homework Statement An amusement park ride consits of a rotating vertical cylinder with rough canvas walls. After the rider has entered and the cylinder is rotating sufficiently fast, the floor is dropped down, yet the rider does not slide down, The rider has a mass of 50 kilograms, the radius...

What is the centripetal foce for the rotation on one's own axis? Take an example of a ball, you spinned it and left it in an isolated condition. It keeps on spinning. While each of its atom is doing circular motion around a fixed point. What is the centripetal force causing it to circulate...

I am thoroughly confused about centripetal force. I was doing this problem myself and when looked at the solution i was fairly confused. The problem was like this. There is a thread which is hinged to a pole and the pole is rotating with an angular velocity of 'w'. The rope has got...

Hey guys. Heard about this forum from a friend and decided to join up. Just so you guys know, some of my questions are pretty random and weird , hope i don't annoy you fellas... Alright, first question i got. http://img170.imageshack.us/img170/5953/00000000zd3.png say you have 2 arms...

Homework Statement An athlete swings a 5 kg ball horizontally on the end of a rope. the ball moves in a circle of a radius .800m at an angular speed of .500rev/second. if the maximum tension the rope can withstand before breaking is 100N, what is the maximum tangential speed the ball can...

I had to do an experiment where you manipulate and change different variables (mass providing centripetal force, radius etc.) and then further invesigate the effects on centripetal force that these changes had. My problem is that it says that by keeping the mass providing the centripetal force...

A 2.5 kg object moves at a constant speed of 8.0 m/s in a 5.0 m radius circle. What is the object's acceleration? I'm quite sure the answer to the problem is 32 m/s^2, but apparently the right answer is 13 m/s^2. Unless I'm missing a detail about the "constant velocity" part of the problem...

Centripetal Acceleration ! Homework Statement An Engineer wishes to design a curved exit ramp for a toll road in such a way that a car will not have to rely on friction to round the curve without skidding. He does so by banking the road in such a way that the force causing the centripetal...

I need help with this lab I'm doing involving swinging a mass in a circle (I'm sure you guys have heard of it). I have to plot a graph of Radius vs. FT^2 and then compare the value of the slope to its theoretical value. A couple questions: Which goes on the y axis? Radius or FT^2? How do I...

Homework Statement A 33kg child stands at the rim of a merry-go-round of radius 3.66m, rotating with an angular speed of 1.2 rad/s. Find the minimum force between his feet and the floor of the carousel that is required to keep him in the circular path. Homework Equations I drew out...

Homework Statement A hawk flies in a horizontal arc of radius 13.5 m with a speed of 3.9 m/s. What is its centripetal acceleration? (I correctly found this to be 1.1267 m/s².) Next question is: If it continues to fly along the same horizontal arc but increases its speed at a rate of...

Homework Statement One method for determing masses of heavy ions involves timing their orbital period in a known magnetic field. What is the mass of a singly charged ion that makes 7.0 revolutions in 1.3 x 10^-3 seconds in a 4.5 x 10^-2 T field. a) 2.1x10^-25 kg b) 1.3x10^-24 kg c)...

Homework Statement Calculate the centripetal acceleration, in units of m/s2, of the Earth in its orbit around the Sun. Assume that the Earth's orbit is a circle of radius 148,022 thousand km. Homework Equations v= 2 pi r/ T Ac = V^2/ r The Attempt at a Solution I solve for V and...

Hi, I'm currently studying Physics for my GCSEs and I'm revising for them but the textbooks only explain what happens but not why. I know that centripetal force is the force requirement for an object to move round in a circle. But I don't see why this is the case for satellites orbitting the...

Centripetal force?? Does centripetal force actually act on a body? I have a question regarding the same here. If the satellite is attrated to the Earth by the gravitational force F and simultaneously a centripetal force F also acts on the Body. Then the net force acting on the body is: a)F...

Homework Statement A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 34 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 120 m), the block swings toward the outside of the...

Here is the homework question... According to the Guinness Book of World Records, the highest rotary speed ever attained was 2010m/s(4500mph). The rotating rod was 15.3cm(6in.) long. Assume the speed quoted is that of the end of the rod. What is the centripetal acceleration of the end of the...

Homework Statement An object orbits the Earth at a constant speed in a circle of radius 6.38x10^6m, very close to but not touching the Earth's surface. What is its centripetal acceleraion? Homework Equations The Attempt at a Solution Quick question, when would GM/r^2 equal to the...

Estimate the time it takes a satellite in “near-earth” orbit to go once around the earth. To do this, assume that it is close enough to the earth’s surface that the gravitational force acting on it is about equal to its weight on earth, mg. Proceed as follows: a. Find the centripetal...

Homework Statement Determine how long it would take for the satellite to make 1 complete revolution around earth A 500 kg satellite is orbiting earth, radius of Earth is 6.38 x 10^3 km, and acceleration of gravity as the orbital altitude of 160km is the same as Earth basically 9.8.Homework...