Balls Definition and 541 Threads

Homework Statement Ball 1 (B1) and Ball 2 (B2) are located at (x,y)=(0,0) and (x,y)=(d,h). At t=0, B1 is sent towards the initial location of B2 with a speed vi. At the same instant that B1 is launched, B2 falls towards the ground with zero initial velocity. Assume there is no air...

Homework Statement An urn contains 3 white and 4 red balls. A ball is chosen at random ( in a frequency sense) and replaced. What is the probability of the first 5 balls chosen exactly 2 will be white. Homework Equations The Attempt at a Solution Really I haven't made much...

Homework Statement Two ball are dropped from 5m high, Use 10 m/s^2 for the magnitude of the acceleration due to gravity. Homework Equations How do i start? The Attempt at a Solution not sure on how to start so i haven't attempted:(

The President is going to a ping-pong match in Tokyo. He is taking 8 balls with him. A terrorist has implanted one of the balls with explosives, but they add such a small amount that no one can tell the difference. The CIA has only enough time for TWO weighings before the match. I...

1. A spelunker (cave explorer) drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 1.64 s after the stone is dropped. How deep is the hole? 2. A ball is thrown upward from the top of a 25.0-m-tall building. The...

Homework Statement A ball is thrown straight up from the ground with speed v_o . At the same instant, a second ball is dropped from rest from height H - there's no air resistance. Find the time when the two balls collide. The Attempt at a Solution The path of the ball which is...

Homework Statement There are two questions. 1) A baseball, m=0.045 kg, moves in +y-direction with v = 5 m/s. a tennisball is moving in the -x direction with speed of 2m/s. Wat is the magnitude and direction of total momentum in the system? 2) A 0.01 kg rifle bullet is fired with v = 500...

Homework Statement Two balls, Ball A on the left, and Ball B on the right, are moving towards each other. Ball A is much bigger and heavier than Ball B. Ball A is moving with speed x, and Ball B is moving with speed y. They collide, and an elastic collision occurs, sending Ball B rebounding...

Everybody knows that if a ball hits an equal mass ball the one that was moving will stop and the other on which was stopped will move, this is the funtioning of Newtons craddles. My question is rather simple: If a 1kg billiard ball at a speed of 1 m/s hits a 2kg still ball, with what...

My friend asks me this problem, and i fail. It seems unsolvable. Can anyone help You have to use the scales 3 times to identify 4 balls which look identical but with different weights: 1; 2; 3 and 4kg each. Thanks.

Homework Statement A ball is thrown vertically upwards with a speed of 10m/s from a point of 2m above the horiztonal ground. a) Calculate the length of time for which the ball is 3m or more above the ground. Homework Equations v^2=u^2 + 2as v=u+at The Attempt at a Solution So there's...

pool balls grade 12 please help issue resolved tyvm to Trajan22

Homework Statement i'm retaking a test question for half credit and this is the 3rd part to the question. i know the velocities are correct because the teacher gave us the answers. this SHOULD be simple... but okay.. (velocity) V1 = 20ft/s, V2 = 0ft/s. after the collision V1` = 16ft/s...

Homework Statement Two identical balls, A and B, of uniform composition and initially at the same temperature, each absorb exactly the same amount of heat. A is hanging down from the ceiling while B rests on the horizontal floor in the same room. Assuming no subsequent heat loss by the...

Two identical steel balls, each of mass 1.4 kg, are suspended from strings of length 36 cm so that they touch when in their equilibrium position. We pull one of the balls back until its string makes an angle q = 36° with the vertical and let it go. It collides elastically with the other ball...

Homework Statement 3 balls are on a ?string?/line?. Each are equally displaced, 72cm. Ball A has a charge of -50e5c, Ball B a charge of +25e2, Ball C -10e10. 1. What is the net force applied on the middle ball (Ball B)? 2. Assuming a force to the right(ungiven name of Ball D?) (of Ball C)...

Homework Statement Three balls, with charges of +4q, -2q, -q, are equally spaced along a line. The spacing between the balls is r. We can arrange the balls in three different ways: (1) +4q, -2q, -q; (2) -2q, +4q, -q; (3) +4q, -q, -2q. (a) Which ball experiences the largest magnitude net force...

Here's the situation: We have a ruler, inclined slightly with a strong ceramic magnet at the end. Now, we put two identical ferromagnetic (steel, for example) balls on the top of the ramp, touching each other. We let the balls roll down the ramp, and, perhaps against intuition, the balls...

hi all I'm doing an experimental investigation for a school project on bouncing basketballs. I've linked this project with kinetic and potential energy (i.e I've written how kinetic and potential play a role in the resultant rebound height) and I'm wondering if anyone knows any other...

hello i would really like to figure out the amount of energy one would reuqire to throw a tennis ball into space hypothetically speaking? i understand that this is impossible but i would like to find out anyway. i would be very grateful if anybody could help me with this. thankyou

Here is the question: Three identical small Styrofoam balls (m = 1.93 g) are suspended from a fixed point by three nonconducting threads, each with a length of 49.0 cm and with negligible mass. At equilibrium the three balls form an equilateral triangle with sides of 29.2 cm. What is the common...

You might or might not have seen the astro blaster. But if you drop two soccer balls (stacked together) you'll notice that the smaller top soccer ball lifts up to great heights. I am researching this phenomenon for my extended essay and would really appreciate it if you guys could provide me...

I need to find a complete metric space and a sequence of nested, closed balls such that their infinite intersection is empty. How is this possible?

Hi, I have got a bit stuck on some basic principles to do with the motion of a billiard ball, and was hoping someone could point me in the right direction! Assuming I have the linear velocity and angular velocity of a uniform billiard ball (with the centre of mass exactly in the middle), how...

Can anybody tell me if there is a technical name for the balls that are used to float on a liquid surface to stop evaporation and heat loss? Thanks

Can somone please walk me through how to do this problem. I've been going at it for wat too long: A ball is thrown upward from the ground at an inital velocity of 25 m/s; at the same instant, a ball is dropped from rest from a building 15 m high. After how long will the balls be at the same...

When is a Planet a planet...? and when is it just a ball of gas..? My personal belief is that Jupiter, Saturn, Neptune and Uranus...should NOT be considered planets. How can you call a spheroid ball of rotating gases a planet ? Surely, if you can't step on it, land on it or float on it...its...

Here's the problem: "Two steel balls are suspended on (massless) wires so that their centers align. One ball, with mass 2.30 kg, is pulled up and to the side so that it is 0.0110 m above its original position. Then it is released and strikes the other ball in an elastic collision. If the...

Consider a set box boxes. Say we have 30 boxes. And then we have x number of black balls and y number of white balls And these balls are stacked in the boxes. The total nuber of ways of stacking them is easy to find, but a much harder problem is to find the probability that for anyone of...

# Two identical spherical balls A and B are given equal amount of positive and negative charge. What is the ratio of the masses A and B now? a)Equal to one b)Greater than one c)Less than one d)May be Greater than or Less than one depending on their sizes

Is there exist a program that I just give the (x,y,z) coordinates, and the program draw me a 3D ball where I asked. I will use it to draw a crystall consisting of balls. I need the program to help me visualize the structure of a crystal, and to draw a picture of a crystall, and identify the...

an urn contains 4 red balls and 4 white balls an experiment consists of selecting at random a sample of 4 balls and recording the number of red balls in the sample setup the probability distribution and compute its mean and variance i know what a probablity distribution is. can someone please...

I think this is a fairly basic question, but I have been out of physics since high school. Let's assume that I have two identical bowling balls, except that one is 15 lbs and the other is 16 lbs. If we avoid discussion about ball rotation and friction on the lane, how much additional speed...

Mechanics Question :) Hi. Two small balls A and B have masses 0.5kg and 0.2 kg respectively. They are moving towards each other in opposite directions on a smooth horizontal table when they collide directly. Immediately before the collission, the speed of A is 3m/s and the speed of B is 2...

Hey guys I know you're probably going to laugh at me for this question, but what is the name of the pendulum thing with five balls suspended on strings? You know, the thing that every boss has on his desk in every movie? I have been trying to figure it out for a while now.

a 5g balls fall dropped from 3m bounces up 1m. if 100 such balls fall on an area of 2m^2 every second what is the average pressure exerted by the balls? ive tried to solve this problem 100 different ways and i can't get the answer (3Pa).

Two balls, of masses mA = 32 g and mB = 80 g are suspended as shown in Figure 7-44. The lighter ball is pulled away to a 60° angle with the vertical and released.a) What is the velocity of the lighter ball before impact? (Take the right to be positive.) a) What is the velocity of the...

Ýou have 12 balls. All of them have the same mass. Except one. You don't know if it weighs more or less than the other 11 balls. Your mission is to find the odd one out, and say if it weighs more or less than the 11 others. You have a balancescale. You may use it for three weighings. The...

I have a golf ball that I want to cut open. How do I go about doing this? Just use a knife? I don't want to cut my finger open! What do I do!?

Okay, I got another problem for you guys that I have been trying to figure out. Here first is the diagram: I have been experimenting with different weights of balls and different weights of cars, also different ramp lengths. 5 balls are supposed to be used. Nothing seems to work at...

(Resolved)Calculating moment of inertia of a system of balls I have a bit hard time calculating moment of inertia of a a system of balls. The system is defined as follows: 3 balls that are the same are connected with thin rods soo that the center of each ball is in the corners of a equilateral...

Is there a technology available that would let me paint some small dots of a reflective coating on a golf ball, and then use a radar-type device to detect it? I know that a company called Radar Golf has developed a gps system that uses a chip inside a golf ball and a scanner to locate it, but...

The problem first gives conditions: given that an urn contains n orange balls and n yellow balls, and two are selected at random. The question was to determine the probability of getting two balls of different colors. I did (1)*(n)/(2n-1) Where 1 represented the...

Help Needed Asap! Please! Hi! I need to solve the following problem before tomorrow.. otherwise I'll be in big trouble. :rolleyes: I've already discussed it with classmates, but they also don't know how to handle it. Please help me! Ok this is the question: A ball A is thrown off a...

The question is: - Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Ball A is moving upwards along the y-axis at 2.0 m/s, and ball B is moving to the right along the x-axis with speed 3.7m/s. After the collision, assume elastic, ball B is...

The question is: - Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Ball A is moving upwards along the y-axis at 2.0 m/s, and ball B is moving to the right along the x-axis with speed 3.7m/s. After the collision, assume elastic...

I've recently found my old plasma ball, so decided to waste a couple of hours becoming entranced with it. I noticed that if I touched it with anything other than my hand, the streams didn't seem to be attracted to it. I did a bit of reading on it and found that it has to be something which will...

No, I'm not crazy, nor will use them in an unethical manner. I simply want a novel subject to photograph for Advanced Photography (The judges probably haven't ever seen such a thing.) and to use on the 4th etc. I've tried setting bouncing balls on fire, doesn't work. How can I make them, or one...

Suppose r red balls and g green balls are mapped randomly among b bins. Calculate the expected number of bins where red balls are in majority. My attempt, Let x_ijk = 1 (when kth bin contains i red balls and j green balls) = 0 otherwise Then, F = \sum_{k=1}^{b} \sum_{i=1}^{r}...

Identical balls are rolled down 2 inclined planes of the same height but different inclines. Do they reach the bottom at the same time. Neglect friction and air resistance. Do the balls have the same speed upon reaching the bottom of the incline? :rolleyes: