What is Accelaration: Definition and 137 Discussions

Weight is defines as the force exerted by the ground on you. F=ma, and m and a are constant. But the weighing machine does not show the same value when you simply stand on it and when you jump on it. So basically my question is, even though force exerted is same, why is there a difference in...

Are the accelaration and forces in different inertial referance frame equal ?

Homework Statement A uniform flexible chain of length L ,with weight per unit length λ , passes over a small frictionless peg..It is released from a rest position with a length of chain x hanging from one side and a length L-x from the other side .Find the accelaration a as a function of x...

Question A point charge q_{1}=15\muF is held fixed in space. From a horizontal distance of 4.00cm , a small sphere with mass 4.00\times10^{-3}kg and charge q_{2}=2.00\muF is fired toward the fixed charge with an initial speed of 43.0m/s. Gravity can be neglected. What is the acceleration...

A ball is attached to an inextensible string of negligable mass and hangs vertically under gravity. At time t=0, it is given a horizontal velocity u and begins to move in a vertical circle of radius r. At any time t>0, the ball is at an angle θ to the vertical and has a velocity v tangential to...

Homework Statement A body moving in a straight line with constant accelaration takes 3 seconds and 5 seconds to cover two successive distances of 1m.Find the accelaration? Homework Equations The Attempt at a Solution

Homework Statement English is not my first language from the beginning I apologize for any mistakes in scientific terms, anyhow. Car with 500kg. No initial velocity, and from origin or the referential. Circular track, 50m radius. The module of the velocity increases in 2m/s Homework...

Homework Statement Two go-carts, A and B, race each other around a 1.0km track. Go cart A travels at a constant speed at 20.0m/s . Go cart B accelerates uniformly from rest at a rate of 0.333m/s2. Which go-cart wins the race ? and by how much ? EDIT: When it says around it means they raced...

circular accelaration with increasing velocity? Homework Statement Object starts at rest at an angle of 0 degree's. the object is accelerated along a 45 degree arc with a radius of 2 meters to a speed of 7m/s at which point it is released. the object has a mass of .3 Kg. What is the equation...

I am in year 10 and I am very interested in physics, but I came up researching on this topic of acceleration due to gravity, but when I looked this question 'accelaration due to gravity is 9.81ms-2. what is the value in imperial units (ft.s-2)' I really wanted to work it out so badly. Could...

Homework Statement I took this right out of the text, it is not home work just me trying to get better. The acceleration of a particle is defined by the relation a = -8 m/s^2 Knowing that x = 20 m when t= 4 m, and that x = 4 m when v = 16 m/s (a) determine the time when velocity is zero and...

H. Young (page 319) says g=GM/R^2. This means g(R)=GM/R^2. So, g(t)=?

if a beaker is placed on the disk(both are moving with uniform angular velocity).let droplet of water are fallen into the beaker.what would be the effect on uniform angular velocity if it will be angularly accelating.

Hi, I have the following question. What is: A. Positive accelaration. B. Negative accelaration. C. Positive decelaration. D. Negative decelaration. If I am not wrong then: A is just getting faster. B is getting slower(Not sure about that) C is just getting slower. D is going...

I'm sorry if I put this question to the wrong question. But I have problems to understand why is the angular acceleration [omega]^2/time. I know that I get it when I do the derivation, but it kinda seems that if the angular acceleration is eg. 4rad/s^2, that in the time 1s the angular...

Homework Statement A ball is thrown horizontal out of a window 18m above the ground. it is thrown horizontally at 5.0ms. show that it takes about 2 seconds to drop. Homework Equations S=ut+1/2at^2 The Attempt at a Solution u=0 a=9.8 s=18 18=0t+1/2*9.8t^2 36=9.8t^2...

Homework Statement A camero runs a red light and hits an suv directly behind where a tv news crew is filming. from the sound of the dqueling tires recorded on film, the police can tell that the driver applied his breaks for exactly 1.69 secs. a csi team review the clip and determines the care...

Angular Accelaration = Angular Velocity^2 ? Homework Statement Can we always says angular accelaration is equal to angular velocity^2? My friend said that i was wrong when think like that to solve question? Homework Equations Accelaration = -(angular velocity)^2 X Radius Acceleration...

Question A: This one is easy but my answer is coming out wrong, maybe my signs are wrong. The question is as follows: A ball is launched directly upward from ground level with an initial speed of 19 m/s. How many seconds after launch is the ball 8 m above the release point? I set...

Question A: This one is easy but my answer is coming out wrong, maybe my signs are wrong. The question is as follows: A ball is launched directly upward from ground level with an initial speed of 19 m/s. How many seconds after launch is the ball 8 m above the release point? I set...

The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.7m, measured from its tip to the center of the circle. find the ration of the centripetal accelaration at the end of the blade to that which exists at a point located 3.0m from the center of the...

HI all We know that Force = Mass * Acceleration An object moving at constant velocity will have zero acceleration. So when it impact an object or a person, a force is felt. Equation above suggests that force is zero. Please explain why this equation fails for this case, and a...

A penny rests on a record at a radius r=0.200m. The record player is turned on and the record steadily accelerates with angular acceleration alpha=20.0 rad/s^2. The coefficient of static friction between the record and the penny is 0.500. At what time will the penny begin to slip?

Homework Statement When a chameleon captures an insect, its tongue extends 18 cm in 0.10 s. (a) Find the acceleration of the chameleon's tongue, assuming it to be constant. m/s2 (b) Let Δx be the amount that the chameleon's tongue moves during the first 0.050 s. Compare Δx with 9 cm...

Homework Statement Two solid bodies rotate about mutually perpendicular intersecting axes with constant angular velocities \omega_1 and \omega_2 . Find the angular velocity and angular accelartion of one body relative to the other.

Hello. Why is it so that the accelaration of free fall on a unit mass on equator = Gravitational force -Centripetel Force? Answer ample for a level purposes is required...

Homework Statement can we measure time and accelaration at the same time? what exactly acceleration operator is? Homework Equations heisenberg's uncertainity principle The Attempt at a Solution I guess acc. operator is dp/dt i.e. \frac{\partial^2 }{\partial t \partial...

Homework Statement A particle moves along a circular path having a radius of 2.0 m. At an instant when the speed of the particle is equal to 3.0 m/s and changing at the rate of 5.0 m/s2, what is the magnitude of the total acceleration of the particle? Homework Equations magitude=...

1. how would you set up an experiment to show angular velocity and angular accelaration that can be done in a classroom with classroom equipment?

If an object were discovered oriting at a radius of 3*10^6 m, what would be the time that it would take to complete one orbit around the sun? So I know I need to use the following equation: T^2/R^3 = 4pie^2/GM but do I use the radius they gave me or do I have to add that radius to the the...

I'm having many a woes with angular accelaration in my DE Physics class. Could you guys explain to me how to do these 3 problems. (If I can get one of them by logical deduction from the other problems don't go out of your way.) Thanks. A merry-go-round accelerating uniformly from rest...

The owners of a fun-park are designing a new ride. This will have a section in the form of a helix whose central axis is directed horizontally. Patrons will travel along the helical path in carriages whose speed is a fixed value, u. The carriages will be upside down when they are at a high point...

I was on my way to school this morning and i suddenly thought of somthing about relativity that has been bugging me ever since. Would i be right in saying that one of Einsteins theories or relativity (cant remember which) says that accelaration is equal to gravity and that the force felt from...

Just need some help with the following questions which are probably very easy to you guys. Here are the 2 questions I need help with. 1). A boat sails 150m due south and 150m due east. This takes a total time of 45s. Calculate (i). the boat's average speed and (ii) the boats average velocity...

A simple problem but i can't seem to get the answer i am told. I am thinking that i have mixed up my equations of motion The question i have to answer is this. A boy throws 2 stones verticly downward from a 50meter high cliff inot a calm pool of water.The 2 stones are thrown 1 second apart...

How can ý calculate the gravity accelaration where ý live? ýf you answer me will be very happy..

Hi guys I really want to find someone who can tell me to calculate the gravity accelaration where ý live . ý hope you will help me!