برخی مشکلات عمده و حل نشده در فیزیک نظری وجود دارد و چنین به نظر می رسد که نظریه های موجود قادر به حل آنها نیستند، به این معنی که پدیده ای خاص یا نتایج مشاهدات تجربی با نظریه های موجود قابل توضیح نیستند. Revision books, based on , for each chapter as well as notes of each chapter are available to download in pdf format. These issues are divided into two categories: A: The questions that modern physics does not have answers for, and the physicists believe that it is due to the inability of theories. Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. No Subject 12th Standard 11th Standard 1.
Also, by preventing the wheels from locking up you have greater control of the vehicle. During a turn, do the rear wheels necessarily trace out the same arcs as the front wheels? Therefore, θ can be differentiated with respect to time. In standard model, photon does not experience time. We can definitely say that the best way for explain this process is using color charge conce pt from photon properties. At each junction the current will divide with more taking the path with less resistance and less taking the path with more resistance. Assume there is no friction between merry-go-round and ball. In this paper, I have tried to answer this question.
As a result, the object cannot remain completely submerged and it floats. Some new theories suggest that time does not exist at the quantum level. Objective questions are best for concept building. These questions are designed to challenge and inspire you to think about physics at a deeper level. The electromagnetic field generated by a photon is much stronger than the associated gravitational field.
The pin joints O 1 and O 2 are attached to a stationary base and are separated by a distance b. So, to date there is no way to explain the process that describes how particles as photon absorb gravitons. The right side of the pump casing is located at a horizontal distance c from the vertical line passing though point P. Problem 2 An engine uses compression springs to open and close valves, using cams. Problem 14 A quality test has determined that a pump impeller is too heavy on one side by an amount equal to 0.
This sets us up to get the current in all the different segments of the circuit. Extra study material covering the whole syllabus divided into 10 units will help the students in revising the complete course. These questions go beyond the typical problems you can expect to find in a physics textbook. This reduces the braking force and the car takes longer to stop. Graviton carries gravity force, so it is absorbable by other gravitons; in general; gravitons absorb each other and combine.
Problem 19 In an astronaut training exercise, an airplane at high altitude travels along a circular arc in order to simulate weightlessness for its passengers. The passengers would feel as if they are experiencing a force. A motor turns the top roller at a constant speed, and the remaining rollers are allowed to spin freely. If an object is heavier the force of gravity is greater, but since it has greater mass the acceleration is the same, so it moves at the same speed if we neglect air resistance. The macroscopic and microscopic divisions of physics will be introduced. The bow can be treated as a type of spring. Problem 7 Two identical cars collide head on.
Here's how it looks when the graph is superimposed on the circuit. All linkages are pin jointed and allow for rotation. Problem 10 A child on a horizontal merry-go-round gives an initial velocity V rel to a ball. The container is then given an initial pure rotation w, with no initial translational motion. Find the maximum cable tension during the lift, which includes the part of the lift before the pump casing loses contact with the ground, and after the pump casing loses contact with the ground lift off. In general relativity, gravity is a consequence of curves in space and time that works perfectly for describing gravity on the macroscopic scale.
This is defined as centrifugal force. During half a rotation the flywheel has to absorb 1000 J of energy. The massless particle is an assumption, also a long series of very different experiments lead to the current experimental upper bound on the photon mass greater than zero. The distance from the pivot to the center of the front face of the spinning gyroscope wheel is L, and the radius of the wheel is r. There are concepts and equations in physics classical mechanics, relativity and quantum mechanics that we can use to reach an understanding that is able to be experienced and by which we can review relativistic Newton's second law. I created solutions for the 20 physics questions given above. Problem 2 Why do objects float in liquids denser than themselves? A variable torque T is applied to the flywheel such that it rotates at a constant angular velocity.