Physics problems Definition and 190 Threads

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).

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  1. RadiationX

    Improving Problem Solving Skills in Physics: Tips for Aspiring Engineers

    I love math and physics. The mechanical things that calculus requires to be successful i do with ease. Solving problems in physics is another matter though. I am struggling with the problem solving that physics requires. Physics is definitely not math, math is a tool of physics. I'm solving...
  2. U

    A couple of basic physics problems

    a couple of "basic" physics problems i am stuck on a couple of my homework problems for my "basic" physics class. any help with either of them would be greatly appreciated. 1. a window washer pulls herself up in a bucket-pulley apparatus (single massless, frictionless pulley). how hard must...
  3. P

    Two Physics problems Work and Electricity

    Here're three problems I have trouble solving, can someone please point out what formula I should be using? 1) An adult pulls a child across the ice on a sled. The combined weight of the sled and the child is 26N, and the adult pulls on a rope that joins the sled at an angle of 30deg (Pi/6 Rad)...
  4. H

    Understanding Precision and Uncertainty in Physics Problem Calculations

    Hi. I was wondering how do you calcultate physics problems when you must also note the error of measurement. I mean if you have a weight-scale that has a percison of 20 g, and let's say that the scale shows 0,7 kg. Does that mean you have 0,7 kg +- 0,02 kg or 0,7 +- 0,01 kg. Or what. And...
  5. S

    Challenge Accepted: 3 Hard Physics Problems for You to Solve!

    Can three people here post one hard physics problem for me to solve??! (That's one person per problem)
  6. M

    Understanding Polarization: Exploring Grade 12 Physics Problems

    Grade 12 physics problems :( One question: Because of absorption, a Polaroid will actually transmit 40% of nonpolarized light incident on it. Two such Polaroids with their axes aligned will transmit a. 16%. b. 24%. c. 30%. d. 32%. e. 40%. The answer is 32% and I have no cue...
  7. S

    Solving Two Physics Problems: Weighing Rocks and Steel Barbells

    Alright, these two problems are driving me nuts: 1. ---To verify her suspicion that a rock specimen is hollow, a geologist weighs the specimen in air and in water. She finds that the specimen weighs twice as much in air as it does in water. The solid part of the specimen has a density of...
  8. S

    Solving Physics Problems: 25N Force, 2.5 kg Block, and 35deg Incline

    anyone physics experts know how to do this questions? A force of 25 N parallel to a 35degrees inclined plane pulls a 2.5 kg block 5 m up the plane at constant speed. (a) How much work has been done by the 25 N force? (b) much work has been done by friction? (c) How much work has been done...
  9. C

    How Does Acceleration Impact the Period of a Pendulum's Simple Harmonic Motion?

    1a)A simple pendulum is 4.35 m long. What is the period of simple harmonic motion for this pendulum if it is hanging in an elevator that is accelerating upward at 5.90 m/s2? b)What is the period of simple harmonic motion for this pendulum if it is placed in a truck that is accelerating...
  10. B

    How Do You Solve These Introductory Physics Problems?

    Hello I have 2 problem for homework. I just started physics so these problems are probably quite easy however i was not at school today and was not taught how to do them. I don't even know wher to begin so any help would be great. Anyway the problems are: 1) Train A leaves Atlanta, heading...
  11. J

    Stuck on Physics Problems? Let's Solve Them!

    okay well spent all day today working on these problems so my brain is now fried, I got about 2 left out of the 100 I had to do so it's not that bad I guess, but I'm stuck on these two and got no idea where to go. lets start with the one I got farthest in first (collision question): 1). A...
  12. P

    Why Am I Struggling with Newtonian Physics Concepts?

    :confused: I need more help please. I am moving along slowly in my physics quest to understand. The readings are more difficult and my understanding comes in and out. Please review, see how I did (answers marked with *) and make comments to help me learn. Thanks. 1. Which of the...
  13. M

    Physics Problems: Block Acceleration & Friction | Solve with Variables

    1) A block is placed agains the vertical front of a cart. What acceleration must the cart have in order for the block to not fall? The coefficient of static friction between the block and the cart is Us (mu s). How would an observer on the cart describe the behavior of the block? (Solve with...
  14. M

    How Do Torque and Work Relate in Physical Systems?

    1. Four horses together pull an old-fashioned drill of the type used to make big guns. It has four levers mounted horizontally on a revolving central axes. Assuming each horse pulls at the same angle of 45 degress to the radial lever of the drill, and pulls with a given force, T, how much...
  15. S

    Help With Physics problems i'm having trouble

    1)Find the stopping distance of that same car when it is traveling up a 17.1° slope, and it locks its wheels while traveling at 34.9 m/s (78.2 mi/hr). Assume that mu_k does not depend on the speed. 2)A mass of 4.100 kg is suspended from a 1.430 m long string. It revolves in a horizontal...
  16. B

    How Do You Solve Complex Physics Problems Involving Newton's Laws?

    These problems are really giving me fits, I would really appreciate some help. A 12200 kg sailboat experiences an eastward force of 27400 N due to tide pushing its hull while the wind pushes the sails with a force of 56200 N directed toward the northwest (45± westward of North or 45±...
  17. S

    HELP 3 physics problems that i am stuck on

    HELP! 3 physics problems that i am stuck on Help me out guys. I am in a college physics class and a week and a half into the class i am stuck. 1.) A bullet is moving at 244m/s. It hits a tree and penetrates 8.34mm. (A)What is the average acceleration as it slows? (B) Assuming constant...
  18. L

    Solve Physics Problems: Oil Slick Diameter & Bowling Ball Speed

    I'm having trouble figuring these 2 problems out: 4000cm^3 (.004m^3) of oil is spilled onto a smooth lake. If the oil spreads out uniformly until it makes an oil slick 3 molecules thick, with adjecent modlecules just touching, estimate the diameter of oil slick. Assume the oil molecues have...
  19. D

    Another quick physics problems (wave motion)

    A 30.0 m steel wire and a 20.0 m copper wire, both with 1.00-mm diameters are connected end to end and stretched to a tension of 150 N. How long does it take a transverse wave to travel the entire length of the two wires? I really don't need an answer but rather something to get me going.
  20. 1

    Solving Physics Problems: Forces and Acceleration

    i'm trying to finish up my online homework before the due date tonite at midnite. i have the rest perfect, just these three got me stumped. 7. [CJ6 4.P.038.] A cup of coffee is sitting on a table in an airplane that is flying at a constant altitude and a constant velocity. The coefficient of...
  21. F

    Solving 2 Physics Problems: Work and Force Calculations

    k few questions I am stuck on... 1) A student with a mass of 80.0 kg runs up three flights of stairs in 12.0 sec. The student has gone a vertical distance of 8.0 m. Determind the amount of work done by the student to elevate his body to this height. (constant speed) and.. 2) Bob is...
  22. M

    What is the final temperature of the soup after the ice has melted?

    Problem 9. A student drops metallic objects into a 224 g steel container holding 325 g of water at 28±C. One object is a 472 g cube of copper that is initially at 87 degrees C, and the other is a chunk of aluminum that is initially at 9 degreesC. To the students's surprise, the water...
  23. I

    Physics Problems: Modules 2-7, 9 - Solving with Calculations and Explanations

    i took physics class by correspondance so i can get a better grade, now i have a few few per module (modules consists of over 50 odd questions), please just point me in the right direction and i'll do the rest, thx, some may seem pathetic though, but i want to get good marks so i don't want any...
  24. M

    How Do Interference Patterns and Diffraction Determine Angles in Physics?

    Problem 6. A sodium-vapor street lamp produces light that is nearly monochromatic. If the light shines on a wooden door in which there are two straight, parallel cracks, an interfernece pattern will form on a distant wall behind the door. The slits have a separation of 0.3740mm, and the...
  25. P

    Physics Problems: Energy, Angular Momentum, and Acceleration Calculations

    A cylinder of mass 12.0 kg rolls without slipping on a horizontal surface. At the instant its center of mass has a speed of 12.0 m/s, determine the following energies. ROTATIONAL KE, and toltal energy. #2: The position vector of a particle of mass 3.50 kg is given as a function of time...
  26. S

    Solve Two Physics Problems: Ebonite Rod & Electroscope

    Hey everyone! I was wondering if someone could help me with these two physics problems i have to turn in tomorrow. Here's the first: An ebonite rod with an excess of 6.4 X 10^8 electrons shares its charge equally with a pith ball when they touch. What is the charge on the pith ball, in...
  27. D

    Looking for More Advanced Physics Problem Books?

    On Mechanics,Waves,Oscillations,Heat and Thermo etc etc. I have been doing Problems In Physics by Irodov. But i want some more.
  28. L

    Struggling with Physics Problems? Get Expert Help Now!

    I got these problems from my teacher, my physics teacher of course, they're about angular momentum, conservation of momentum etc. The problem is that i have no ideea how to even begin solving them. If there is anyone out there who thinks that he/she is good in physics can u give me a hand. I...
  29. H

    Solving Christmas Tree, Ocean, and Triangle Physics Problems

    1)The silhouette of a Christmas tree is an isosceles triangle. The angle at the top of the triangle is 10.2 degrees, and the base measures 1.67 m across. How tall is the tree? 2) A person is standing at the edge of the water and looking out at the ocean (see figure). The height of the...
  30. B

    How Can I Boost Creativity in Solving Physics Problems?

    I feel like I am just plugging into equations when I solve physics problems and I don't know how to be creative in my solution methods. Does anyone have any suggestions to help me improve my problem solving? I am a going to be a first year grad student soon and I didnt do that well in my JD...
  31. tandoorichicken

    Why Are These Physics Problems So Challenging?

    I hate to be taking up so much board space today, but all my problems are so freakin difficult. 1. a) show that the kinetic energy of a satellite in circular orbit r about the Earth is one half the magnitude of its gravitational potential energy. b) what is its total mechanical energy? 2...
  32. M

    Solve Physics Problem 12a: Net Electric Field at y=2.1m

    Problem 12a. Given:k_e=8.98755*10^9Nm^2/C^2. A 5u_C point charge is on the x-axis at x=2.3m, and a 4u_C point charge is on the x-axis at x=3.3m. Determine the magnitude of the net electric field at the point on the y-axis where y=2.1 m. In N/C. Note: I been getting wrong answers from...
  33. G

    Solve Physics Problems: Moon, Sun, Springs & Conical Mound

    Someone please help me how to do these problems below. Thanks a lot for your help. 1) On the surface of the moon the acceleration due to gravity is approximately 1/6 the sun at the surface of the earth, and on the surface of the sun it is approximately 29 times as great as at the surface of the...
  34. M

    Solving Physics Problems: Problem 3 & 5

    Problem 3. A dog sits 1.4 m from the center of a merry-go-round. The dog undergoes a 1.7 m/s^2 centripetal acceleration. What is the angular speed of the merry-go-round? Answer in units of rad/s. Problem 5. A girl sits on a tire that is attached to an overhanging tree limb by a rope 2.30 m...
  35. M

    Calculating Jupiter's Orbital Period Around the Sun: A Physics Problem

    The Earth orbits the Sun once a year at a distance of 1.50x1011 m. Jupiter orbits the Sun at distance of 7.78 x 1011 m. These distances are between the centre of the planet and the sun. How long ( in Earth days ) does it take for Jupiter to make one orbit around the Sun? T(period = 8.64E4...
  36. A

    Challenging physics problems uniform circular motion, centripetal force

    challenging physics problems...uniform circular motion, centripetal force here is the setup, we had a lab in class, in which a string was strung through a plastic tube. On on end, rubber stoppers were attached and in this case acted as a mass. On the other end, metal masses were hooked on to...
  37. E

    Solving Physics Problems: Sleds, Trucks, Bullets & Cars

    1. A 16-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 24 N. Starting from rest, the sled attains a speed of 2 m/s in 8 m. Find the coefficient of kinetic friction between the runners of the sled and the snow. 2. A dump truck of 2500 kg is being...
  38. M

    How Do I Solve These Advanced Physics Problems for My Engineering Class?

    Plz help - # 1 and #2 are due tomorrow Im in an engineering physics honors class and I am having trouble figuring out how to go about solving a few of the problems that I have encountered. 1) A system has 2 blocks m1 and m2 ( on a flat frictionless plane), connected by a massless spring...
  39. P

    Solve Physics Problem: Jet Aircraft Launch from Carrier

    Hello, I'm doing this problem; a jet aircraft bein launch from an aircraft carrier acceleration from the rest along a 94m track for 2.5sec? The problem is my answer is different from book I am using the equation V=V 0 + at V=94m T=2.5sec V=0+94m(2.5sec)=235m/s I know this...
  40. S

    Are Ramp Length and Angle Key to Reducing Work in Physics Problems?

    Problematic Physics Problems (please help) Hi, I recently received a couple of grade 11 physics problems that I'm having a tough time with. I found this forum, and I hope that I can get some hints on how to go about solving these problems. The problems are all regarding work/energy/power. I...
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