What is Physic: Definition and 221 Discussions

Hello enlighted people of this forum. I'm an undergraduate from a university in Colombia, my subject of study is software engineering but I have a class which is named "Physics 2", this class introduces the subjects of simple harmonic motion(pendulum, sound waves, etc), electric fields, Gauss's...

Hello, new to the forum. I am currently in high school taking a full load of college classes through dual enrollment. I will graduate high school with an Associates of Science degree. I really enjoy math. It has always been my favorite subject. At the moment I am in Calculus 1 and it isn't so...

Hi I'm 16 years old, the physics and maths in school is really easy and it quickly becomes boring. So I wish to study outside of school, can you please recommend me some good books on calculus? I am a beginner in the subject and only know the big picture of what calculus actually is, so...

A string that is 6m long is vibrating with 3 loops in it. The frequency of the source is 16.5Hz. What is the fundamental frequency of the string? For the life of me I can't figure out how to solve this question. I found out that the wavelength is 4.8m but that's about it. If I use the equation...

Hello Community! Hope I've finally found a forum which could help me with this question :) Currently I'm preparing for a rather big software project in college. For this, I need a 3D Physics Environment/engine which supports more or less realistic air friction. What I want to achieve is to...

Hello, I'm looking for some book of common (real) life or interesting problems, which are presented and scientifically sloved. I don't preffer any problem, but I mean some from real life, fridge, gyroscope, atc. Do you know any book of these problems and solution?

Homework Statement Refer to the decay scheme of 137Cs What is the value of the internal‐conversion coefficient Homework Equations α = Ne/Nγ Ne=number of conversion electrons Nr=number of competing gamma photons for that transition The Attempt at a Solution α = Ne/Nγ =2/1 a=2 The correct...

1. Homework Statement The wing of an insect is 1.7 mm long. When viewed through a microscope, the image is 1.4 m long and is located 5.9 m away. Determine the angular magnification. Homework Equations di/do=hi/ho M=beta/alpha alpha=object size/object distance beta=image size/image distance...

Hello all, i need your help. And thank you forward for those who will. Im looking for a computer program, that would simulate physic...most important would be simulation of magnetism , gravity and mass. Simple form of what i am looking for: Make cube in 3D world, set its mass, set its material...

Homework Statement Two particles A and B, of masses 2m kg and m kg respectively, are connected by a light inextensible string which passes over a fixed smooth pulley. The system is released from rest, with both portions of the string vertical and taut, while A and B are at the same height. Find...

Hi! I need to prove that: (∂U/∂V)P = TCV/V For a perfect gas. But I don't know start. Can you help me please?

Hi everyone, Is there a simple formula/equation for calculating the mass of a star simply by measuring it's redshift. I know there is a way to do it, but have been unable to find any clues on the web.. Thanks for your help! :)

Hello, I'm currently in college and getting a bachelors degree in physics and engineering, I also might get a bachelors in math too. I was wondering how much money I would start off getting with those degrees together? I've seen how much engineers get and physicist but what if you have both? Thanks

Hey all, I am currently a freshman double majoring in Physics and Math at Purdue University. I have been recently creating a schedule that orders all of the courses I need to take and those that I want to take for the rest of my undergraduate endeavors. I know that it's rather early to do...

Hello there, My name is Sara and I have an electrical engineering degree from an American university and a physics degree in the field of nanophysics from a United Kingdom university. I would like to move to the field of astronomy and astrophysics. I joined this forum to learn, share...

PROBLEM: As the solar nebula cooled, grains of dust achieved thermal equilibrium with the young sun. We can assume the young Sun had a luminosity of 75% of the present day value, find the distance from the sun at which grains of water ice first become stable; known as the snow line. Assume...

1) A projectile is launched with a speed of vo at an angle of θo with respect to the horizontal. Derive an equation for the max height it reaches above its starting point in terms of g, θo, vo I set Vox = vo and Voy = (V) sin θ, I tried everything and have no idea how the answer is H = (vo^2...

Hi, I have many questions to ask you. Due to financial crisis in my family, I am unable to continue studying in Canada. However, I insist on studying Physic in Germany. Therefore, I want to come back to my homeland, Vietnam, and spend a year to study German. Do you think it necessary...

Physic is my major and there are some electives of math units now...I am in trouble with choosing one pair from these two options: 【MATLAB】+【Advanced ordinary differential equations】 or 【Algebra and number theory】+【Real analysis】 can anyone tell me which one is better for me if I plain to...

A rocket hits the ground at an angel of 60° from the horizontal at a speed of 300 m/s. a. Draw the vector representing the rocket's impact and show the westward and eastward components of it's velocity. b. Calculate the horizontal and vertical components of the rocket's impact velocity.

A rocket heads at an angel of 40° West of North at a speed of 150 m/s. A Draw the vector representing the planes flight and show the westward and northward components of it's velocity. b. Calculate the westward and northward components of the plane's velocity. Please i really need help...

Homework Statement A car traveling 100 km/h is 200m away from a truck traveling 50 km/h (in the same direction) . Assuming constant braking acceleration, what is the minimum deceleration the car must have if it is not to hit the truck? Homework Equations I know acceleration is a = (Vf -...

Homework Statement Consider a bar of length as measured in frame S. Show that the bar has the same length in frame S’, that is, show that lengths are invariant under Galilean transformations. Homework Equations x'=x-vt The Attempt at a Solution I know that t'=t y'=y z'=z so...

Math is able to prove and disprove things while science can only disprove. The reason we can't prove much about the actual world is because unlike in mathematics we don't have enough starting axioms. If the math world isn't real and is just an object of the mind it would make sense that us...

I am signing up for my third quarter of college classes soon and I have to choose if I am going to take Differential Equations or Matrix Algebra this quarter. I am given the option to take either of them and I do not know if I will be able to take the other one anytime soon. Which of the two...

Homework Statement We have an ideal Bose gas in gravitational field. Show that the critical temperature( the temperature in which the condensation is starting is: T_c = T^0_c( 1 + \frac{8}{9} \frac{1}{ζ(3/2)} (\frac{\pi mgh}{kT^0_c})^{1/2} ) Attempt Lege artis; Firstly I want to...

How do they get from the Rsinθ the value I have found the one I search: Rθ (extra string length) I know that sinθ = θ when θ is small but there Rsinθ is the extra height the mass gain when we push it from initial position to a θ angle with vertical, I don't see how it could be the extra...

Hi, Currently i am doing a physics major(first semester) and even though i hated it the experimental courses, I loved the dynamics part with a touch on the relativity. Right now, i am not planning to be a physicst, i am doing this for educational and interest purpose only. When one asks...

Hi I am an 1 year engineering student at the University of British Columbia. I am thinking about going to engineering physics but I want to know what kind of career possibility awaits me if I do go down this path. Is engineering physics worth the trouble?

Homework Statement The binary star system Krell consists of two stars, Krell A and Krell B, orbiting each other, with no other ojects nearby. Assume Krell A, the smaller star of mass mA, moves in a circle of radius rA at speed vA. Krell B, the larger star of mass mB = 2.51mA), moves in a...

Homework Statement A bullet of mass m = 17.6 g traveling horizontally at speed vo = 565 m/s strikes a block of mass M = 678 g sitting on a frictionless, horizontal table. This time, however, it comes out the other side of the block at speed v = 524 m/s. Calculate J, the magnitude of the...

Can you please help with the following problems? Formulas would be greatly appreciated or talking me through a problem. Thank you! 1.) A mass of 40 kg suspended from a 48-cm long light string forms a simple pendulum. The mass swings through the lowest point of its trajectory with a speed of 2...

Homework Statement The handle of a floor mop makes an angle θ = 28.6o with the horizontal. Assume the handle is massless, and the mop has mass M = 1.4 kg. The coefficient of kinetic friction between the mop and the floor is μk = 0.386. Find F, the magnitude of the force, exerted downward...

Homework Statement A rock is tossed straight up with a velocity of When it returns, it falls into a hole deep. What is the rock's velocity as it hits the bottom of the hole? Homework Equations The Attempt at a Solution

1. The problem statement, variables and given/known data A tourist being chased by an angry bear is running in straight line toward his car at a speed of 4.0m/s. The car is a distance d away. The bear is 26m behind the tourist and running at 6.0m/s. The tourist reaches the car safely. What is...

Homework Statement B. Torque Due to Perpendicular Component of F 4. The tension in string 1 (on the left) is not known, so we will calculate the torques about this point (10.0 cm). (That way, there is no torque due to the unknown string 1.) Calculate the torque due to the weight of the meter...

My brother asked me this question and i completely have no idea how to do cause it is a very long time. Can anyone help, or give me an idea on how to do A rectangular insulating sheet carrying a negative charge Q evenly distributed over its surface is formed into a cylinder, producing a...

Homework Statement Hi guys. Recently, my physics' teacher told my class to make an experiment from any of the themes which are covered in the period. I need some ideas in which I can make something, somewhat good and not easy looking, but at the same time not very budget consuming...

Homework Statement What will be the equilibrium temperature when a 245-g block of copper at 285° c is placed in a 145 g aluminium calorimeter cup containing 825 g of water at 12°c? Homework Equations q=mcΔt qlost+qgained=0 -qlost=qgained -m1c1t1=m2c2t2 The Attempt at a Solution...

Homework Statement A student of weight 656 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitude of the normal force N on the student from the seat is 581 N. (a) What is the magnitude of N at the lowest point? If the wheel's speed is...

please i need help. i need help in getting a physics fair project idea for middle school students and another for high school senior which will be interest and will catch attention.

Homework Statement At a distance of 45 meters from a traffic light, a car traveling 15 m/s is brought to a stop at a constant deceleration a) What is the value of Deceleration (-5m/s) b) How far has the car moved when its speed has been reduced to 3 m/s c) How many seconds would the car...

Hello Physics Forums! I am new to this forum but have definitely been browsing through here for a while now. I am just wondering how hard is it to get an A in physics? I am talking about the beginning general physics with calculus. From what I have seen, students at my school seem to have a...

Hi Guys, I'm just a bit confused, or at least I think I am, with the physics relating to panpipes. From my current understanding, panpipes work like this; Air jet is created that enters the pipe, this pressure then forces the undisturbed column of air inside the pipe to oscillate at its...

I start to learn about matrices and their algebra, but I am wondering what physical application they have. I know that matrices have application in optics, which is called “Matrix Optics”, but do they have other applications? Can you give different and real physical examples with matrix algebra...

Hello, i am reading on the Bohr Model. There are some parts i just do not understand. in classical mechanics, an object, such as an electron, revolving ina circle may assume an infinite number of values for its radius and velocity. Why is this? Therefore the angular momentum (L= mvr) (...

Hi everyone, I have a question that is very important for me and I really need your recommendation. I am a technologist or in another meaning radiographer who has BSc in this field. I applied to more than medical physics master programs and I was accepted in two of them. My question is...

Homework Statement The position r-> of a particle moving in an xy plane is given by r->=(2t^3-2t)i+(3-2t^4)j with r in meters and t in seconds. What is the angle between the positive direction of the x-axis and a line tangent to the particle's path at t = 3 s? Give your answer in the range...

Physic Problem. Please Help! Homework Statement Upon spotting an insect on a twig overhanging water, an archer fish squirts water drops at the insect to knock it into the water. Although the fish sees the insect along a straight-line path at angle φ and distance d, a drop must be launched at a...

Homework Statement I 'm having a struggle on my A2 level physics course work. I need to carry out the experiment which is rolling a metal ball down a slope and with a different materials at the end of the slope to stop the ball such as elastic band, folded paper and balloon, the difficult part...