Physic Definition and 211 Threads

Homework Statement I reckon that we only apply conservation of linear momentum for object which has total net force acting on equal zero but in this case , the gravity force still exist , total net force is mg Thank in advance Homework Equations The Attempt at a Solution

Homework Statement Two train cars are on a straight, horizontal track. One car starts at rest and is put in motion with a constant acceleration of 2.4 m/s2. This car moves toward a second car that is 29 m away and moving at a constant speed of 4.0 m/s. a.) where will they collide b.)...

Homework Statement Now, consider the relativistic velocity addition formula: speed= (v+u)/(1+vu/c2. If v = u = 0.01c = 1 % of c, what is the relativistic sum of the two speeds? Express your answer as a percentage of the speed of light to five significant figures. Homework Equations the...

hello people i would like to say that i am just 18 years old i am from greece i was always really interested in physics but unfortunately my school didnt give us the knowldges we should have i really love physics and especially quantum physic so i know the basics but i would love to earn more...

Here I have a question which I'm unfamilar with. I'm not sure how to answer the question by explaining what is involved with the diagram. Discuss the following pictures in terms of work and power outlining any assumptions that you make.

1. Greater sound energy forms larger waves. Larger waves have: a) higher frequency b) greater amplitude c) more compressions and rarefactions d)slower speed 2.Vibrations with a frequency below 16Hz are called: a) audible b) supersonic c)infrasonic d) Ultrasonic 3.If you shorten a...

I have a problem, I am a video game programmer. I have a car that bump into objects. At a given time I want it to stop to rotate in any direction. But the angular velocity still continue. Any idea how to conter the angular velocity?

Homework Statement Find the components of the vector \vec{C} with length c = 1.00 and angle \phi = 30.0^{\circ} as shown. Homework Equations opp=hypcos(\theta) adj=hypcos(\theta) The Attempt at a Solution tried to use the above equations to answer the question, however when i...

Hey all, I've just started grade 11 and started studying Physics for the first time, so I have very little knowledge in Physics and find it very difficult to understand things that are given to me during class and reading them off the internet. Some of my main questions that I have trouble...

A Toyota Vios (m = 1700 kg) is parked on a road that rises 15° above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires?

Hi, I am a computational science major and I am interested to learn physic. Could anyone please recommend me some physics websites that teach me or a book for beginner? Any help please! Thank you

I’m not quite sure what I’m doing on this forum. I was sent a gift subscription to a science magazine and was so delighted with it; I gave a grandson a subscription to the same magazine. We get into lively discussions regarding the contents of the various issues. He challenged me to read Stephen...

Homework Statement A block of mass M hangs from a rubber cord. The block is supported so that the cord is not stretched. The unstretched length of the cord is L0 and its mass is m, much less than M. The "spring constant" for the cord is k. The block is released and stops at the lowest point...

Homework Statement Note that am a beginner in physics,hardy know any,so be gentle (: There are three particles in a line below. The question is where must we put Q3 so it will get 0 total power. Q1=6 mC Q2=15 mC Q3= -8 mC In a line of 2 meters like this...

Homework Statement http://img163.imageshack.us/img163/7010/78614537.jpg o= student The position of the teacher is (d) from the mirror. mirror is 6m a) Calculate the maximum distance(d) of the corridor from the mirror b) Trace the diagram. Draw the ray diagram to support your calculation...

Hey! So basically the problem is I was put in a physics class because all the others were full! I'm terrible at it and as a result I am not a big fan of the subject! so anyway i have to write about how physics applies to the job of a forensic physicist! i know they use ballistics , blood spatter...

Homework Statement Assume 50 W of power is used to perform each of the following tasks (one at a time). a. Lifting 1000kg (1 ton) by one meter. b. Lifting 1 g (0.001kg) by one meter. (Hint: What is the potential energy gain by the object?) How long would it take to complete the first...

Homework Statement A model rocket is launched straight upward with an initial speed of 46.7 m/s. It accelerates with a constant upward acceleration of 2.16 m/s2 until its engines stop at an altitude of 138 m. What is the maximum height reached by the rocket? How long after lift off does...

I want to learn these books by myself,but I don't know the sequence. Walter Greiner course of Physics - 14 Books Summary: 1 Quantum Mechanics: An Introduction 2 Quantum Mechanics. Special Chapters 3. Quantum Mechanics: Symmetries 4. Relativistic Quantum Mechanics. Wave Equations 5. Field...

Homework Statement Hello, i am in physics 30 and my teacher gave our class a worksheet for homework and I am stuck on the last question. Could anyone help me out please? Thanks. Here is the question: Show that the units of 2\pim/ qB are equivalent to seconds. How can I get the unit...

https://www.youtube.com/watch?v= I have a little problem with a formula, that I think it's not ok. It gives to me the result of units of electric potential (\vec A ) and velocity \vec v . The result seems to be volts per velocity, and I don't know it there exists this unit, or is a mistake...

1st of all please give me some guidance since I am a new here and please remind me if I am do wrong in term of my wrongly area of posting, i just want to make some freinds and to share the knowledge wif all of u guys, thanks for supporting and thanks for all ur help and guide thanks agains...

When we hit brakes on a forward moving car, the front of the car moves down and the rear moves up. Why?

please help me,, Mastering physic.. rounding number :( A photon of wavelength 4.38×10^−2 nm strikes a free electron and is scattered at an angle of 38.0 degree from its original direction. Find the wavelength of the scattered light. and my answer is this 4.43×10−2 nm (correct answer) Find...

A 0.5 kg ball initially at rest is subject to three forces: 1. F1 has a magnitude equal to 5.0 N and points 36.9 degrees above the horizontal direction (relative to the positive x direction), 2. F2 has a magnitude equal to 2.0 N and points to the left (negative x direction), 3. F3 has a...

consider a circular clock face of radius= 50cm.a charge of 3nC is placed at the 3 o'clockpoint (a distane of 50cm from the center of the face). a charge of 6nC is placed at the 6 o'clockpoint.9nC is placed at the 9 o'clockpoint and 12nC is placed at the 12 o'clockpoint. what is the electric...

the angular velocity of the satellite to be equal to the rotation rate of the earth.given that the radius of the Earth is 6380km and the mass Earth 5.98 * 10^24.how high the surface of Earth should satellite be placed

I am considering changing my major to Philosophy and Physics with a astrophysics minor, since my school doesn't offer astronomy and astrophysics as a major. My current major is biotechnology. I was reading some article that was a little scary, it is about how the job market for physicist isn't...

Hi I'm new to physic. "What does 'traverse' mean?" So like I am a junior in high school taking Physic. In my book, it uses words that I don't understand. For example, the word 'traverse.' what does it mean?

Homework Statement In a Beams ultracentrifuge, a 20.3 cm long rotor is suspended magnetically in a vacuum. Since there is no mechanical connection to the rotor, the only friction is the air resistance due to the few air molecules in the vacuum. If the rotor is spinning with an angular speed of...

[SOLVED] Physic Question Homework Statement Calculate the location of the center of mass of the Earth-Moon-Sun system during a full Moon. A full Moon occurs when the Earth, Moon, and Sun are lined up as shown in the figure. Use a coordinate system in which the center of the sun is at x=0 and...

Plz help me For these physics problems! Plz help me For these physics problems! Plz give me the solutions. Thank you. 1. Vertically polarized light is passed through three successive polaroid filters. The transmission axes are at 30, 60, and 30 degrees to the vertical. What percentage of the...

Homework Statement Find all possible values of L, Lz, and θ for an electron in a 3d state of hydrogen. I confuse it long time.. explain me please..

Homework Statement heres the question: An island is located 900km (North 30 degrees east). The weather office informs him of a prevailing wind from the west of 80km/h. If the pilot wasnt to maintain and air speed of 300km/h, how long will the flight take? Homework Equations The...

I'm at chemical engineering as beginner.I will have my first physics exam on 17 November and I can't decide how I should study.Exam includes these subjects: Physics and Measurement, Motion in one Dimension, Vectors, Motion in Two Dimensions, The Laws of Motion, Circular Motion and...

Hi.. I am a keen student in physics 12 under the bc corric.. right now were doing static equillibrium.. and I am looking for sites, texts etc.. with loads of sample problems that can help me nail this unit and upcoming ones as well.. any help would be great thanks

a general physics q please help! A bob rotates clockwise in a vertical circle at the end of a 1 m long rope. In the pint, where the rope makes the horizontal to the right, the acceleration of the bob is (-2i+3j)m/s^2. At that instant -sketch the acceleration vector and find its magnitude...

Pls help on this problem that I can not solve it. a room measures 3.0 m by 4.5 m by 6.0 m. The heating and air conditioning ducts to and from the room are circular with diameter 0.30 m, and the air in the room is to be exchanged every 12 minutes. What is the necessary flow speed in the duct...

Hi, I have an problem that I can not get the answer, any help would be greatly appreciated. An archer shoots an arrow with a velocity of 45m/s at an angle of 50 degrees with the horizontal. What is the height of the arrow at a point 150 meters downrange?

Roller coaster physic? what is the optimal angle for a banked curve on a roller coaster?

Hey guys, I'm really sorry if this is the wrong place to post but didn't know where else to post. I was wondering if anyone out there could give me questions so I can practise for gr 11 physics. Preferably: 1 Force Motion Question 1 Sound Question 1 Light (SALT) Question 1 Light...

Can someone help explain the idea behind solving this roller support question. I have the answer, couldn't figure how to solve it. I would greatly appreciate the detail explanation...:rolleyes:

Hi everybody. My physics final is right around the corner and i was just wondering if there was any good way to help prepare and study. Physics isn't the easiet subjects for me, i tend to over think problems and get myself all nervous. Please let me know if there are any problem solving...

Homework Statement The information was posted as an image http://img300.imageshack.us/img300/5259/question01em4.jpg Homework Equations The Attempt at a Solution This question is confused, I very much appreciate if some one can help. It is NOT a homework question, it was a problem in...

At school we have a problem to solve but i don't know how to solve this problem. Here is the condition:"Ball is throw vertical upward with inceptive speed v0.Of what height h the kinetic energy of the ball decrease two times? Resistance of the air is ignored." I am sorry if don't write it right...

What is the background physics of "bouncing a ball? Momentum and impulse are the background physics but is there any thing else?

What is the best way to study this subject?

A coal fired plant generates 700 MW of electrical power. The plant uses 5.8 * 10^6 kg of coal each day. The heat combustion of cal is 3.3 * 10^7 J/kg. The steam that drives the turbines is at a temperature of 320 C, and the exhaust water is at 45 C. Note: 700 MW= 7.0 * 10^8 J/s = 6.0 * 10^13...

1st year physics help - hot air balloons... see next post...

below are my posts on my homemade RPG i was planning, after endless disagreement for help because of the exploding part i have subsided to a normal model rocket, seeing as how i bought a d-class rocket engine anyway. so, I would just like some certain equations that would help me in my launch...