Balls Definition and 541 Threads

A ball of mass 0.200 kg has a velocity of 1.50i m/s; a ball of mass 0.300 kg has a velocity of -0.400i m/s (where "i" is supposed to be that unit vector along x-axis). They meet in a head-on elastic collision. (a) Find their velocities after the collision. I know I can use the conservation of...

try this, there are eight bags. each bag contains 10 balls. one of those bags contains balls weighing 2 kg(all balls weigh the same). All the other balls weigh 1 kg. you have a weighing machine (not a balance). in one weighing u have to find out which bag contains the faulty balls.

have been trying to make me own workig Newton cradle. I know some physics. the problem is that my balls don´ta completely stop moving after the coalition, they rather continua their movement but with a reduced violocity. This typ of movement increases and grows with the number of coalitions. At...

A novelty toy has two spheres of equal mass suspended by strings of equal length and negligible mass, and arranged so that the spheres can collide head-on at the bottom of each string’s swing. One sphere is given an initial velocity u towards the other, which is at rest hanging vertically. A...

If there is a box which has 7 red balls, 4 white balls and 9 black ball and you take 3 balls out what is the probability of the three balls being red and the probability of the balls being 2 white and 1 red

It is time for my HS Physics Class final project. I have about a month to design and build a piece of equipment to show my knowledge of any topic we have covered this year. My idea was to have a basic small magnetic linear accelerator ( just basic type for shooting steel balls such as this...

Hi, I am having trouble recalling my concepts in momentum. I just remember its conserved :rolleyes: Plus, I am horrible with directions, so need help understanding this problem, as well as the underlying concepts. Two pool balls are rolling along a pool table. The orange pool ball has...

A system consists of 10 0.50-kg balls, each moving radially outward from a common center in a symmetrical pattern, all at a speed of 12 m/s. What is the kinetic energy of the system? My instinct is to say 0, since it it symmetrical and every ball moving one direction will be canceled by a...

this is no doubt older than dirt, but it just popped into my head when trying to think of how to convince my beginning linear algebra class that every linear isometry of R^3 has an eigenvector: i.e. it follows from the theorem that one cannot comb the hair on a billiard ball. do you see how...

A 0.308 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. What is the mass of the second ball? so i used the formula m1v1initial + m2v2initial = m1v1final + m2v2final v2initial=0...

In the figure, two tiny conducting balls of identical mass m and identical charge q hang from nonconducting threads of length L. Assume that q is so small that tanq can be replaced by its approximate equal, sinq. First find an expression for x in terms of L, q, m, k and g. Then, given L...

The balls are released from rest at a height of 5.0m at time t=0s. How long t_g does it take for the balls to reach the ground? Use 10 m/s^2 for the magnitude of the acceleration due to gravity. i'll use the position formula for this problem: y = y_0 + V_{y_0}*t - 1/2*g*t^2 well i know...

Two identical small insulating balls are suspended by separate 0.25-m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0×10–4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a result, spread...

There are two balls which are apart from each other but there is a line going from the balls diagonally up and these two join. The topic is electricity so I have said the two balls have like charges as they are repelling. See [PLAIN]www.kgmm.co.uk/balls.GIF[/URL] for diagram. The question...

Hello one and all. I could use a little guidance here on a probability problem. Box #1 contains a black balls and b white balls while box #2 contains c black balls and d white balls. A ball is chosen randomly from box #1 and placed in box #2. A ball is then randomly chosen from box #2 and...

If the first ball in problem 7) has a mass of 10 kg and the second ball is traveling at it with a speed of 14 m/s, what is the velocity, to one decimal place, of the first ball after collision? Problem (7) says A 9.8 kg steel ball, traveling left to right at 12 m/s, undergoes an elastic...

i kinda need help. okay I am posting my question: Two pith balls have a mass of 1.0g and have equal charges. One pith ball is suspended by an insulating thread. The other is attached to a static insulator and is brought close to the suspended ball so that they are 5 cm apart when repulsion...

Hi, I think I understand so so why golf balls aren't made smooth (is there a name for those circular dips). I assume it allows a better (laminar?) airflow, with less turbulence and higher pressure on the backside. I would appreciate if someone could confirm this or give a clear and concise...

How does a plasma ball work? http://www.iwantoneofthose.com/PLABAL_GADG.htm

A tennis player swings her 1000 g racket with a speed of 8.00 m/s. She hits a 60 g tennis ball that was approaching her at a speed of 11.0 m/s. The ball rebounds at 36.0 m/s. 1)How fast is her racket moving immediately after the impact? You can ignore the interaction of the racket with her...

One problem 1.) Two bowling balls each have a mass of 15.8 kg. They are located next to one another with their centers 1.8 cm apart. What gravitational force do they exert on each other? (Use G = 6.670 10-11 N · m 2/kg2.)

hi, if anyone knows how to do this question, could you please get me started? A ball is thrown upward from the ground with an initial speed of 23.2 m/s; at the same instant, a ball is dropped from a building 16.1 m high. After how long will the balls be at the same height? thanks...

I have been working on this alllll night PLEASE SOMEONE HELP! I never ask for help with this stuff but i really need help with this. I don't understand how to do these problems and i have 5 others. They all go something like this: Two students are on a balcony 19.6 meters above the street...

I ran across an interesting problem in quantum uncertainty today. I'm working out the details right now, but I thought I would share. This might belong in brain teasers or something like that, but I know some people love problems like these (others consider them a complete waste of time)...

I have no idea why I can't do it.. I must have done it a million times before: Two cork balls of mass .2g hang from the same support point by massless insulating threads of length 20cm. A total positive charge of 3.0x10^-8 C is added to the system. Half of this charge is taken up by each...

We have 12 red snooker balls and a scale balance. One of the snooker balls has a different weight but we do not know whether it is heavier or lighter. The scale balance may be only used three times by putting an equal number of balls on each side and noting the balancing result. What 3...

Ok i don't know if you ppl know these http://storeforknowledge.com/stores/163/images/lightning%20ball%20large.jpg How do these work?

You have 3 indistinguishable boxes, containing each one, 2 colored balls: black+black, black+white & white+white. You open one box and, whithout seeing its interior, you take one white ball. What is the probability of taking a second white ball from the same box?

If I cut a ball of mercury with a knife it forms into other balls why is this

Suppose there is an infinite number of small balls, all of which have been uniquely numbered from 1 upwards. Furthermore, you have an infinitely large bucket. That is to say, it can be made as large as necessary. You decide to fill the bucket by throwing in all the balls, in order. Starting from...

:confused: I was wondering if someone can help me with this problem: Two biilard balls of equal mass undergo a perfectly elastic head-on collison. If the speed of one ball was initially 2.00 m/s and of the other 3.00 m/s in the opposite direction, what will be their speeds after the...

Give yourself a minute or two to solve this : You have 2 boxes and 20 balls, 10 black and 10 white. How would you distribute the balls in the boxes (any number in each box so long as the total is 20) to maximize the odds of picking 2 whites on a random selection of 1 ball from each box ...

If a ball at 5m/s struck two stationary balls and it is repelled back at -3m/s at an angle of 15 degrees, what would be the velocity of ball #2 if ball #1 traveled at 1m/s and 10 degrees from the normal?

hi, I am a grade 12 student and am stuck on this question. could somebody help me solve it or solve it for me. the question is: A 1 kg tether ball is suspended by a string .8 m long from a nail a point X, .5 m vertically above a horizontal rob at Y. when the ball is released from Z, it swings...

Two balls hit each other. One ball with a mass of 2m standing still relative to the earth. The other ball has a mass of 1m and hits the ball of 2m at a certain speed. The collision is elastic. Could you calculate the proportion of Linear Momentum between both balls after the collision with...

Two equally charged insulating balls each weigh 0.1 g and hang from a common point by identical threads 30 cm long. The balls repel each other so that the separation between their centers is 8.0 cm. What is the magnitude of the charge on each ball?

The chromoelectric field, which acts on the color charge, is attributed to the strong nuclear force. Discrete quanta of this field are called gluons, gluons also have a color charge. Therefore the chromoelectric field interacts with itself and it can form tiny bundles of gluons that form bound...

a billiard ball traveling 4.0m/s has an elastic head on collision witha billiard ball of equal mass that is initially at rest. the first ball is at rest after the collision. What is the the speed of the second ball after the collision? [b(] Kim

***EPR Experiment with Pool Balls*** First of all sorry if what I am going to ask seems crazy stupid, but it is an idea that rounds my mind since I started reading about EPR subject. As far as I've read, you can imagine EPR with photon polarization or with particle spin. So, I have imagined...

Ok guys. I've just come back from Thanksgiving holidays and I just can't seem to grasp this concept. I have an X, Y, and t from the experiment that we did in lab today. I have a Vy of 91.2cm. I now need to calculate a VyFinal ( Vyf ). From what I have gathered the equation should come out...

Ok, here is a good riddle (waiting for a Riddles thread to be made). You have 9 balls that look totally identical. They all weight the same, except for one of them (that weight either less or more, we don't know). You are supposed to get the odd one out by using a two-sided weight scale only...