What are the most interesting questions in physics?
What are the most interesting questions in physics?Questions about light,energy,gravity, quantum mechanics,…I want to solve problems in physics.A theory of quantum gravity is more or less the holy grail of physics.Find it and this will be the new list of great minds that unraveled gravity:Isaac Newton, Albert Einstein, Your Name HereWhat the current situation is aboutThere are four forcesgravityelectromagnetismstrong nuclear forceweak nuclear forceYou can describe the last three using Quantum theories. But gravity is fundamentally different.Newton discovered that gravity was a inverse square law of attraction between masses.Einstein refined it with his field equations: the presence of masses curves space time and the motion of particles through this space time is almost like the Newton inverse square law. Under extreme conditions it gives different results, that have been observed and confirmed Einsteins theory.Physicists know that when these extreme conditions happen on very small scales we must take into account quantum mechanics.But nobody solved the riddle how to do that. Many think the solution will come from string theory but until it happens nobody knows.
Physics question please explain?
Children Sometimes play with a homemade "telephone" by attaching a string to the bottoms of two paper cups. When the string is stretched and a child speaks into one cup, the sound can be heard at the other cup. Explain clearly how the sound wave travels from one cup to the other.
Interesting Physics question i need help with...?
Correct equations are written in one of the answers. Here I try to explain how the quations come about. Scale shows the reaction of the floor to student's legs/body. What are the real forces of interaction acting on his legs/body? One gravity due to earth. This is 836 N as measured when at rest. Another is reaction of the scale as the spring in the scale is compressed. This is measured as 936 N. In the beginning the elevator has to accelerate otherwise it cannot gain velocity. Note that 836 N act downward as it is due to earth and 936 N act upwards as it is due to compressed spring. It is the difference of these two forces which gives the student upward acceleration a. So we have 936 - 836 = m a. Now you may be wondering how to know m , it is given by the condition of rest or of uniform velocity either upward or downward. Because then the force due to earth is balanced by the reaction of the spring upward 836 = m g Also note that there has to be acceleration upward in the beginning otherwise how does it gain velocity. Now you may be wondering this is students acceleration and not of the elevator but that acceleration is common. Then the data supplied is of teh student's not elevator's
Please help with Physics question. Please explain.?
When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, with a radius of about 30 km (about the size of the San Francisco area). If a neutron star rotates once every second, what is the speed of a particle on the star's equator? What is the particle's centripetal acceleration in meters per second squared? What is the particle's centripetal acceleration in g-units (ratio to g)? If the neutron star rotates even faster, what happens, i.e. what would be the particle's centripetal acceleration in g-units if the period was 0.5 s?
What are the best and most interesting questions you can ask a physics teacher?
what would happen if hypothetically i travelled more than the speed of light?why are most objects in the universe roundishwhy do the laws of physics on macro level differ from those on the quantum level.if the momentum of the erth is used to catapult space missions towards other planets, does it mean that if there was a humongous planet, its momentum could catapult me to a larger range ?whats beyond the observable universe.why cant we use gravity of an object in space and create an artificial atmosphere. how could that be done?
EASY QUESTION FROM PHYSICS BUT please explain?
I presume MCG means moving coil galvanometer. Ideally the magnetic flux is proportional to the number of turns and hence the torque will increase by 20%, assuming the force of the return spring is linear with the angle of rotation. Psi = N * I
Please help me with this physics review question. please explain.?
since the block slide down at a constant speed, all forces are balance. the force that causes the block to slide down is sin(36.4)mg, which is equal to the friction force friction = μ cos(36.4)mg μcos(36.4)mg = sin(36.4)mg μcos(36.4) = sin(36.4) μ = 0.737 final energy = initial energy - work done by friction the final energy of the block is the potential energy initial Energy is the kinetic energy work done by friction = μcos(36.4)mg sin(36.4)/h mgh = .5mv² - μcos(36.4)mg sin(36.4)/h gh = .5v² - 0.737 cos(36.4)g sin(36.4)/h 9.8h = .5(2.6)² - 0.737 cos(36.4)(9.8) h/sin(36.4) 9.8h = 3.38 - 9.79h 19.59h = 3.38 h = 0.172m [this is the altitude] sin(36.4) = h/L L = .172 / sin(36.4) L = 0.29m <== answer hope it helps :-)
Physics Question(Simple but Explain in VERY GOOD DETAIL)?
A. There are two forces acting on the box in the x-direction. 1. The frictional force exerted by the ground in a direction opposite to motion. 2. The horizontal component of the 200 N force he applies at an angle of 30 degrees from the horizontal. Answer-1)Since the box moves at constant speed, both the above forces add up to a resultant of 0. Answer-2) Value of frictional force opposing motion= 200* cos 30 = 173.2 N B. There are three forces acting in the y- direction: 1. Normal Reaction exerted by the ground on the box. 2. Force of gravity on the box 3. Vertical component of the 200 N force. Answer-3)Since the body does not shown any sign of acceleration in the vertical direction, the sum of all the above forces is also 0. Answer-4) Normal Reaction(upwards) = 50 * 9.8 - 200* sin30 = 490 - 100 = 390N The above holds if the angle of 30 degrees is wrt to the horizontal. Else if angle with horizontal is 60 degrees Answer-1) 0 Answer-2) 200* Cos 60 = 100 N Answer-3) 0 Answer-4) 50* 9.8 - 200*sin60 = 490 - 173.2 = 316.8 N
Need help with one question in physics and explained in simple math terms please?
1.Apply Snell’s law to determine the minimum angle for which a light ray incident on the end of an optical fiber is subject to total internal reflection along the walls of the fiber. Assume an index of refraction of 1.3 for the fiber, and that the outside medium is air.