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Physics Puzzles Carbon And Hydrogen Riddle VideoPhysics Puzzle for Curious minds by Science Communicaor Anand Mohan
Because it always has lots of problems. What would you call a clown in jail? Silicon Silly Con. Why couldn't the moebius strip enroll at the school?
They required an orientation. What animal is made up of calcium, nickel and neon? A CaNiNe. What is the simplest way to observe the optical Doppler effect?
Go out at and look at cars. You start the car and accelerate forward very fast. Does the balloon move with respect to the car?
If so, how? No any trick and no any air from window. There are two cylindrical rods of iron, identical in size and shape. One is a permanent magnet.
The other is just non-magnetised iron — attractable by magnets, but not permanently magnetic itself. Without any instrument, how can you determine which is Magnetic?
Additional fun applications for learning physics. Fun Physics Puzzles Collection. Car Comparison - Sort the cars by their highest quality.
Engine Types Puzzle - Sort the engines on the correct vehicles. Weight Comparison - Sort the objects by order of weight magnitude.
Length Comparison - Sort the objects by order of length magnitude. Power Comparison - Sort the objects by their correct power value in Watts.
Speed Comparison - Interactive fun diagram for speed of objects. Car Parts Puzzle - Assemble the parts of the automobile.
Interactive car structure. This seems to be a great idea. But it won't work. Why not? An answer is given in the April. See also the June issue.
Which egg is boiled? This is a very old problem. Two eggs are on the table, one is fresh and one has been hard boiled. How can you determine which is boiled without breaking their shells?
Which is hollow? Two spheres have the same diameter, weigh the same, and are painted the same color. One is solid, of lightweight material. The other is a hollow shell made of denser material.
Without damaging them, how can you tell which is hollow? An attractive puzzle. This puzzle is often criticized for perceived ambiguity.
Here's a version with most of the ambiguity removed. You are given two iron bars, identical except for the fact that one bar has been magnetized, the other is not magnetized.
Using nothing other than the two bars and your hands, how can you determine which is the magnet? We will allow gravity to operate as usual on you and the bars.
Heat one of the bars very hot and let it cool. If the bars no longer attract as strongly, then the one you heated was the magnet. Drop one repeatedly on the floor.
If the attraction between the bars is reduced, then the one you dropped was the magnet. But we ruled these out by specifically requiring that you must use only the bars and your hands.
No string or wire can be used, no other metal, and nothing to heat a bar. You can't even use the magnetic field of the earth. So what is the simplest way to identify the magnetized bar?
One answer, well known, is the "T" test. Place the bars touching in a T configuration, with the end of one at the center of the other.
If they attract, then the one which is the upright of the T is the magnet, for the other has its poles at either end and no pole at its center.
But magnets of high permeability materials can be made with many poles, for example one with a [N SS N] arrangement. Such a magnet would not tend to point north when suspended and might fail the "T" test.
What's the simplest way to identify the magnet, no matter how that magnet's poles are arranged? Which is longer? Prepare two metal tubes.
Mine are cut from 1 inch diameter aluminum tubing from the hardware store. One tube is 11 inches long. Try to ensure that the tubes have no scratches or imperfections that could distinguish one from the other.
Hold them up, one in each hand, and ask if anyone can visually see that one is shorter than the other. Of course no one can. Hold them side by side, touching, and the difference is obvious.
Ask someone to take them, then turn around to hide them from your sight, choose one, and then hand it back to you.
You pretend to judge its length between your hands, touching the tube at its ends, only with your fingertips. What is your secret?
Rolling paradox. Physics textbooks define the force due to friction as a force tangent to two surfaces at their point of contact.
Consider a ball or cylinder rolling without slipping on a perfectly flat and level surface. We expect it to slow down.
We naively assume that friction is the reason it slows down, eventually stopping. Certainly the friction is opposite to the ball's velocity, and would therefore decelerate the ball's motion by Newton's second law.
But that force due to friction has a torque, and this vector torque around the center of mass of the ball is in the same direction as the ball's angular velocity vector.
This would increase the ball's angular velocity, making it roll faster and faster. When inventors first proposed railway transportation, using steel wheels on steel rails, some skeptics said "The wheels will just spin in place, and the contraption won't go anywhere.
Physics puzzles. Physics questions fall into several categories. The bootstrap principle. The tall tales of Baron Munchausen include the story of his narrow escape from a sticky situation when he was mired in a bog.
The resourceful Baron reached down and lifted himself up by pulling on his bootstraps. We know that is impossible, but can a person, using physics and a pulley system, lift himeself using only his own strength?
Consider the system shown. A lightweight chair is used, with an overhead pulley. Can this work? Are there any limitations on this system?
Show the vector analysis with free body diagrams. At rest. Rare is the physics book that doesn't say something like "The net force on a body at rest is zero" in the chapters on statics.
And it also says that if the net force is zero, the acceleration of the body is zero. Then, in the dynamics chapters, we may see "A body thrown straight upward is momentarily at rest at the highest point of its trajectory".
The student then logically concludes that at that point the net force on the body is zero at least for an instant and therefore its acceleration at that point is zero.
Can we blame students for taking textbooks at their word? Can you resolve this apparent contradiction?
Lost energy? The capacitor paradox. This capacitor paradox has been discussed on the web and in published papers, yet people still argue about it.
Obtain two identical capacitors. Charge one of them. Then connect them together so that the charge is shared equally by both. A simple calculation shows that the energy of the two charged capacitors after this operation is only half that of the single initially charged capacitor.
What happened to the lost energy? Of course, one immediately suspects that energy is lost by heating the connecting wires.
So we idealize the problem and use resistanceless connecting wires. Still, we must consider energy radiated away by the accelerating charges during the initial process of closing the switches and in the subsequent acceleration of electrons during the redistribution of charge.
Yet published papers argue about the details of these processes. So what's going on? Is circuit theory and classical electromagnetic theory wrong?
Can you resolve this simply? Grasping straws. We have all done this demonstration, using a drinking straw and a glass of water. Insert the straw in the water A , close off the top of the straw with your finger, then raise the straw, keeping the top closed.
This lifts a column of water inside the straw B in spite of the open end. What physics is being demonstrated?
We do not normally look at details of this simple demonstration, but what about the lower end of the straw? There's a surface of water there, exposed to the air.
What is its shape? It bulges downward. It bulges upward. It is nearly flat. Support your guess with a valid physical argument.
Now let's make it more interesting. Make a hole in the drinking straw at about two inches from the bottom. Make the hole as large as the end openings of the straw.
Now immerse the straw in the water glass. The side hole must be below water level. Now close the upper end of the straw with your finger. Lift the straw until it is entirely out of the water C.
What do you predict will happen? Support your answer by an argument based on physical laws. Specifically discuss what's going on at the side hole.
Now try it. A slippery slope. If you are descending a slippery slope in a car, would you retain better steering control if your front wheels or your rear wheels locked up?
Powerful magnets? One often hears strong magnets described as "powerful". But are they a source of power?
I often hear people argue that magnets must be an inexhaustable source of power. They cite the lowly refrigerator magnet, saying "It supports its own weight on the wall of the refrigerator forever, or at least for many years.
So magnets must be a source of considerable energy. What is wrong with their argument? Gravity enhancement. He used a sensitive torsion suspension to measure such a small force.
Suppose we have a liquid in a U-tube, in equilibrium, and then place a heavy lead ball red just under the left side of the tube. How will this affect the liquid levels in the tube?
Negative reaction? Usually when we pull on something it moves toward us in the direction of the applied force unless it is nailed down.
Can you think of, or devise, a simple system that moves away from you when you try to pull it toward you? Foucault's pendulum.
It was feet long with a 62 pound bob. When set swinging it slowly precessed because it maintained its initial plane of swing while the earth rotated underneath it.
This was easily observed over the course of a day as its plane of swing changed with respect to the floor underneath it. Science museums around the world have such pendulums, and some university physics buildings do also.
But why does the pendulum maintain its motion in the original plane? After all, its suspension wire is attached at the top, and surely the rotation of the building will exert a twisting torque on the wire.
Wouldn't this cause the pendulum's motion to follow that of the building it is in? Some explanation is needed. Then there's the question of initial conditions.
When the pendulum bob is pulled back in the morning and released, this process is done in an already rotating reference frame—the building itself.
Shouldn't this initial motion bias the pendulum to retain that motion for the rest of the day, so its plane of motion wouldn't change at all with respect to the building?
Therefore no apparent precession would be observed. As a university student I was once given some good advice about physics. Textbooks and professors avoid this by seldom raising such questions.
Going around in circles. Mankind, sometimes called "a crawling disease on the face of the earth", affects the earth in many ways.
But one effect of human activity is seldom mentioned. In most countries automobiles travel on the right side of the road.
Traffic circles are traversed counterclockwise. Most automobiles and trucks return home after they take a trip, so their motion is net counterclockwise.
In the USA carnival carousels merry go-rounds also turn counterclockwise, and races, human, horse, dog and auto, are run counterclockwise.
One exception is Great Britain and a few other countries , where all these go clockwise, including auto traffic and roundabouts.
Does this rotational motion on earth's surface alter the rotation speed of the earth, if only just a smidgen? Might this speed up or slow down the earth's rotation?
Should we be concerned? And what is the effect of all those earth satellites we have put into orbit, most of them launched toward the east?
Illustrating centripetal force. A circular argument. A ball is on the end of a string. Holding the other end of the string you swing the ball in a large circle.
But is the tension really equal to the centripetal force? Due to air resistance the ball will slow down.
To keep it going something else must supply energy in the form of work. But if the string is radial, and the ball's motion is tangential to its circular path, the force and displacement are perpendiclar to each other.
So how can the string do any work on the ball to sustain its motion? Pendulum perplexity. Every physics textbook tells us that the period of a simple pendulum does not depend on the mass of the bob.
But these books rarely address the question "Why is the period independent of mass? But there's an easy and insightful way to prove this without even doing mathematics.
Can you? Leaning ball. A uniform sphere of mass m and radius r hangs from a string against a smooth, vertical wall, the line of the string passing through the ball's center.
What is the tension T in the string, and the force F exerted by the ball on the wall? Action and reaction.
Textbooks often tell us that Newton's law is somthing like "For every action there is an equal and opposite reaction. How can any two things be equal and opposite?
One should say: "For every action there is an equal size and oppositely directed reaction. One might argue that "reaction" is a negative "action".PrimaryGames is the fun place to learn and play! Is the pressure Spiele FГјr Jungs the milk on Mittwoch Lottozahlen Am Mittwoch bottom of the bottle now the same, greater, or less than before? Six of the abandoned cycles and epicycles had, in Ptolemy's system, one important thing in common. Silicon Silly Con. Disregard relativistic effects and stick to classial physics. Bells and their clappers are Hells Angels Amerika of nearly elastic metals, and both preserve their shape after many collisions. Textbook end-of-chapter problems Slots Heaven Review usually of this sort. We will allow gravity to operate as usual on you and the bars. Of course, it sags, in the Physics Puzzles of a curve called a catenary. A solid cube rests on a level surface. Seen from above the earth's north pole, the earth revolves around the sun Lambang Dewa Keberuntungan. This lifts a column of water inside the straw B in spite of the open end. Imagine that Coutinho Wechsel new process can produce perfectly frictionless solid materials. Physics Puzzles 1 - Water flowing puzzle.