What is Physics problems: Definition and 190 Discussions

The major unsolved problems in physics are either problematic with regards to theoretically considered scientific data, meaning that existing analysis and theory seem incapable of explaining certain observed phenomenon or experimental results, or problematic with regards to experimental design, meaning that there is a difficulty in creating an experiment to test a proposed theory or investigate a phenomenon in greater detail.
There are still some questions beyond the Standard Model of physics, such as the strong CP problem, neutrino mass, matter–antimatter asymmetry, and the nature of dark matter and dark energy. Another problem lies within the mathematical framework of the Standard Model itself—the Standard Model is inconsistent with that of general relativity, to the point that one or both theories break down under certain conditions (for example within known spacetime singularities like the Big Bang and the centres of black holes beyond the event horizon).

View More On Wikipedia.org
Recent contents Top users
  1. marcus

    Smolin's list of five physics problems

    Any comment on his list? Items you would reformulate, combine, add or eliminate? Is this checklist a good schematic of the challenges facing theoretical physics at this point in history? I find it helps to have memorized so I can use it as an informal gauge of progress and relevance. One...
  2. R

    Solving Physics Problems: Tension, Speed, and Resistive Force

    Good day, ladies and gentlemen. I am a long time board reader (since my high school days) but have not posted in these forums, till now. I initially registered with plans and hopes to enter a career in physics, now I am taking my first formal college level physics course, in the summer after my...
  3. N

    Can You Solve These General Physics Problems?

    Just interested in seeing what peoples answers are to these questions. I am new to the site so this could be considered a test of how well the members of this forums acutally know physics.{I've done this problems and have answers} Interested in seeing which equations you used also. Problem...
  4. W

    Why Does Shrinking MOS Device Dimensions Increase Electric Field?

    Why does electric field in MOS device tend to increase as device dimension shrink describe the cross-section of a MOSFET with short channel showing the charge sharing phenomenon can anyone help me to find out these two problems? I could not find them out from the book thanks a lot!
  5. K

    F=maF=(59)(V-0)/3Solving Ski Slope Physics Problems

    Homework Statement A skier of mass 59.0kg starts from rest at the top of a ski slope of height 70.0m . Homework Equations The Attempt at a Solution If frictional forces do −1.08×10^4J of work on her as she descends, how fast is she going at the bottom of the slope...
  6. A

    Sunday night physics problems

    Sunday night physics problems :( Alright, so I'm supposed to find the displacement equation for a particle fired vertically under a constant gravitational field, where the resisting force is proportional to the instantaneous velocity of the particle. Here's where I'm at: Fup = ma; Fdown =...
  7. C

    Two physics problems involving collisions

    1) A 10.0-g object moving to the right at 20 cm/s makes an elastic head-on collision with a 15.0-g object moving in the opposite direction at 30.0 cm/s. Find the velocity of each object after collision. 2) A billiard ball rolling across a table at 1.50 m/s makes a head on elastic collision...
  8. T

    Some of my Winter Break physics problems

    [SOLVED] Some of my Winter Break physics problems Hey guys, I'm new to this site, and as the way things are going with my physics class, this won't be my last request for help lol. Well anyway, our teacher assigned us a few problems to do over break, and since I have a week left I decided...
  9. M

    Impossible AP Physics Problems

    I need help with some of these problems. Any kind of help will be most appreciated 1. Speed amplifier. In Fig. 10-3, block 1 of mass m1 slides along an x-axis on a frictionless floor with a speed of v1i = 2.80 m/s. Then it undergoes a one-dimensional elastic collision with stationary block 2...
  10. M

    Mastering Elastic Collisions: AP Physics Problems with Solutions

    I need help with some of these problems. Any kind of help will be most appreciated 1. Speed amplifier. In Fig. 10-3, block 1 of mass m1 slides along an x-axis on a frictionless floor with a speed of v1i = 2.80 m/s. Then it undergoes a one-dimensional elastic collision with stationary block 2...
  11. L

    The Secrets of Simple Physics: 2 Problem Solutions Explained

    I have 2 problems. 1) When you run you do not keep your legs striaght, but rather bend them. What is the reason? 2) Assume you are an athelte, and you believe you can tear paper with just one hand? what is the best stragety? list the components of your strategy stated in terms of physics...
  12. ~christina~

    Solving Spring Gun Physics Problems: Acceleration, Speed & Height

    Homework Statement The spring constant of a experimental spring gun is 350N/m. The spring is compresed a distance of 80cm from it's equillibrium position and a 1.5kg musket ball is placed in the barrel against the compressed spring. When the gun is fired the spring extends the length of the...
  13. A

    Solving Physics Problems: Gravitation, Upthrust & Buoyancy

    [SOLVED] Physics Probs HI there!:cool: Can u just give some more ideas and explanation on Gravitation,Upthrust, Buoyancy?:confused: Some numericals to explain n to add on would b better.:smile:
  14. F

    Solving Enigmatic Physics Problems: Acceleration and Frictional Force Examples

    What is the acceleration of a 20Kg pail of cement that is pulled upward by a rope that applies a force of 208 n to the pail? A 10kg box is shoved across a floor at an initial speed of 9m/s. It comes to a rest in 3 seconds after it is shoved. Find the frictional force. Problem begins after...
  15. B

    Hi all, me with a few physics problems.

    Homework Statement A dirt bike rider needs to complete a course that includes a "triple", a jump over three small hills that are speerated by a distance of 50 meters. The incline for the takeoff point is 37 degrees. How fast must the dirt bike rider travel to land 2.5 meters on the down side...
  16. P

    Sig Figs in Physics Problems: Explanation for Two Calculations

    I need an explanation for these two problems How many sig figs should be retained in the result of the following calculation? 12.00000 x 0.9893 + 13.00335 x 0.0107 and (11.13-2.6) x 10^4 / (103.05 + 16.9) x 10 ^-6
  17. S

    Solving Three Physics Problems: SIL and Sound Intensity Calculations

    Three homework questions. I didn't post them in the homework section because I can't even attempt them because my professor didn't even explain them well enough for me to be able to do that. I'm not looking for specific answers, but more just a simple explanation of how to do the type of...
  18. B

    Why Are These Physics Problems So Challenging?

    **I've done various steps to theses problems and can't seem to figure them out. If someone can either give me steps how to do them or just work them out for me I'd greatly appreciate it. Thanks! 1) An electron with initial velocity v0 = 2.6x10^5m/s enters a region 1.0 cm long where it is...
  19. H

    Solving Physics Problems: Max Height, Velocity & Horizontal Dist.

    Homework Statement A man stands on the roof of a building of height 14.1 m and throws a rock with a velocity of magnitude 31.6 m/s at an angle of 25.0 above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock. Calculate the magnitude...
  20. S

    Solving Physics Problems: Dropped Stones, Thrown Balls, and Falling Tiles

    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...
  21. E

    Solving Physics Problems with the Box and Banana

    Homework Statement A box of bananas weighing 40.0N rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.40 and the coefficient of kinetic friction is 0.20. a) If no horizontal force is applied to the box and the box is at rest, how large...
  22. A

    Drawing illustrations (schemes) for Physics problems

    What program should I use for drawing schemes (illustrations) in physics problems and how can I draw sin, cos, sin^2 e.t.c. graphs for my notes? Thank's in advance.
  23. D

    Solving Physics Problems: Tips & Formulas

    Hi there, I'd like some help with the formulas of these following problems. I just need some tips on how to go about answering them -- I'd like to solve them on my own though. 1. Two rods of equal lengths and cross-sectional areas but of different materials are placed in thermal...
  24. G

    How Can Ambidextrous People Improve Their Drawing Skills in Physics Problems?

    In physics problems is very important to draw, sketch up the problem well. I am what is a not right-hander nor left-hander, I do some activities with my left hand (writing, for exemple) and other with my right hand (play tennis...) I have more force on the right hand, but more accuracy in my...
  25. P

    Solving Physics Problems with "Conceptual Physics" 10th Ed.

    INTRODUCTION: This is a problem from my Introduction to Physical Science class using "Conceptual Physics" 10th Ed.by Paul G. Hewitt EXACT PROBLEM: "A 500 kg load is suspended from the end of the horizontal boom, as depicted in the diagram. The angle between the boom and the cable...
  26. A

    How Do You Calculate the Depth of an Object Using Sonar Echoes?

    Homework Statement A submarine on the ocean surface gets a sonar echo indicating an underwater object. The echo comes back at an angle of 20* above the horizontal and the echo took 2.32s to get back to the submarine. What is the object's depth? Homework Equations delta of theta =...
  27. A

    Solving Physics Problems: Strategies & Practice

    How do you guys go about solving a Physics problem. Is there a specific method which most of you follow? I think this is a part of Physics that isn't really dealt with at universities and schools but is very important. When you have a multistep problem, in which a path to the solution is not...
  28. O

    How Do You Solve These Challenging Physics Problems?

    Two Physics Problems .. plsss help ??! Q1 : The figure shows a mass M inside a tube bent in a circle of radius R=1.20 m. M can slide with negligible friction inside the tube. The tube rotates about a vertical axis passing through the center. The mass is in equilibrium at q =56.5 degrees...
  29. A

    Generally, how do you solve physics problems?

    Generally, how do you solve physics problems?? This is for all the physics B problems in general. How do you guys solve the problems? Do you find equations and plug all the known values in? or do you keep all of the variables and solve for the one variable that you are missing without...
  30. K

    Physics Problems Books for IIT JAM Exam Preparation

    hai pleas give me good physics problems book for iit jam
  31. D

    Solving Physics Problems: Finding Speed and Displacement

    i am finding these hard. Any help appreciated A 1.0 103 kg Rover collides into the rear end of a 2.2 103 kg BMW stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.1 m before stopping. The police officer, knowing that the coefficient of kinetic...
  32. M

    Help with a couple physics problems

    I am having some trouble with a couple of physics h/w problems and would appreciate any help you can give me.. Julie pulls a 61.5 N bag a distance of 278 m at a constant velocity. The force she exerts is 48.4 N at an angle of 66.8 degrees above the horizontal. I found the work julie does on...
  33. D

    Solving 3 Physics Problems with Neeraj

    Hello guys, I'm taking my first physics class in College and wanted to cross reference my homework. So here goes :) here's question 1: A particle moves according to the equatio x=10t^2 where x is in meters and t is in seconds. a) find the average velocity for the time interval from...
  34. C

    Solving Physics Problems: A Newbie's Guide

    Okay, I am new to physics and for some reason I am not connecting the dots. I would appreciate if a combination of anyone could explain these solutions. I know the 4 kinematics equations but am really unsure if I need to know other things...like the rate at which objects will always fall or...
  35. M

    Physics Problems: Seeking Help to Get Started

    I would like to inquire the help with a few physics problems : THERES NO WORK BECAUSE I HAVE NO CLUE WHERE TO START. SOMEONE TELL ME WHERE TO BEGIN PLEASE. : 1. A grappling hook, attached to a 1.5m-rope, is whirled in a circle that lies in the vertical plane. The lowers point on this circle...
  36. A

    How Does Star Characteristics Influence Luminosity and Visibility?

    Physics Problems: Help Please! 1.) If a star has a temperature only 7/10 that of our Sun but a radius 10 times our Sun's, how would its luminosity compare to our Sun? The only equation I have for luminosity involves mass and apparent magnitude, so I'm not really sure what to do here. 2.)...
  37. J

    Help Needed: Solving Two Tough Physics Problems

    A bodybuilder is holding a 35-kg steel barbell above her head. How much force would she have to exert if the barbell were lifted underwater? In the hydraulic press used in a trash compactor, the radii of the input piston and the output plunger are 6.1 10-3 m and 4.5 10-2, respectively. If...
  38. D

    Collections of physics problems - good idea?

    I'll be starting grad school next year, and I'm already starting to worry about the qualifier ;) While poking around on Barnes & Noble's site I noticed that there are whole books which are just collections of problems in physics, with and without solutions. I thought that these might be a...
  39. L

    Physics problems (gravitational acceleration and work)

    Need help with my physics homework. 1. Consider three masses that lie in the X,Y plane. The first mass, m1 lies at the origin, second mass, m2 lies at (0, Y2) and let the third mass, m3 lies at (X3, 0). Find an expression for the net gravitational acceleratoin at an arbitrary point in pace...
  40. P

    Solve Physics Problems: Inclined Slide & Dart Gun Spring Compression

    1. Mass M is sliding down the inclined part of a slide at a speed of 1.93 m/s. The mass stops a distance of S2= 2.1 m along the level part of the slide. The distance S1= 1.22 m and the angle theta= 34.70 deg. Calculate the coefficient of kinetic friction for the mass on the surface. I used...
  41. S

    Physics problems Classical Mechanics and Gravitation

    Hi i was wondering if anyone could help me with the following problems please,I'm a bit confused! Q1. A 9.4 kg projectile is fired vertically upwards. Air drag dissipates 68 kJ during its ascent. How much higher would it have gone were air drag negligible? Here I used the formula mgh and...
  42. P

    3 physics problems concerning inductance and rlc circuit

    physics problems concerninginductance and rlc circuit -------------------------------------------------------------------------------- 1. "The resistance of a superconductor." In an experiment carried out by S. C. Collins between 1955 and 1958, a current was maintained in a...
  43. L

    How Do You Calculate Uncertainty in Physics Measurements?

    Can anyone help me how to find uncertainty in values? I did a lab on position-time graph. And I have to find uncertainty in soem of the values. My teacher showed me a shortcut on how to find uncertainty of average velocity. But I did not understand that? I graphed a position-time graph by the...
  44. C

    How Do You Calculate Work Between Protons and Solve Capacitor Charge Problems?

    ive looked at both of these for about an hour and can't figure them out the first one: How much work is required to bring three protons initially infinitely apart, to a configuration where each proton is 1.5x10^-13 m from the other two? (This is a typical separation for protons in a...
  45. G

    Physics Problems: Rainfall Power, Gravitational Force, and Lever Efficiency

    Problem 1: I need you to check the first problem. The answer makes me think I may have done something wrong. 1) A quantity of water equal to 2.5 x 10^10 cc falls from a rain cloud that is 1000 m high. If this rain falls in just 1 hour, how much power is generated? The formula I used...
  46. M

    Anyone know of good sites that teach you tricks to solving physics problems?

    With equations or facts that are not given in textbooks? Just things that can help you solve problems faster with general basic physics for example, the acceleration of a block on a frictionless incline is gsin(theta) the volume displaced by a block in a water is (volume of block) *...
  47. L

    How Do You Solve Basic Physics Problems Using Textbook Formulas?

    Nevermind... I was able to figure both problems out with some notes and problems from the textbook. :smile:
  48. O

    Solve 2 Physics Problems: Air-Track Glider & Planet X Gravity

    An air-track glider is attached to a spring. The glider is pulled to the right and released from rest at t=0 s. It then oscillates with a period of 2.05 s and a maximum speed of 58.0 cm/s. i found the amplitude to be 18.92. they want the gliders position at time 24 seconds. my answer of 5.35...
  49. K

    Help Needed: Solving Physics Problems Involving Work and Energy

    K. if anyone is able to help me with this problem, that would be great. A student carries a 1.0 kg physics book 3.0 m across the room, then lifts it 1.5 m to put it on a shelf. The entire task takes 20 s. a) what is the total work done on the book? b) what is the change in...
  50. O

    Calculate Force and Period of Asteroid Orbit Around Sun | Physics Help ASAP!

    HElp Physics problems...ASAP! Four 1,000,000- kg masses are arranged in a square, 74meters on a side. To the nearest ten thousandth of a Newton, what is the magnitude of the force the mass in the lower left hand corner? If the Earth's period is 365.25 days and its distance to the (center of...
Back
Top