Relative velocity Definition and 407 Threads

"Two balls of the same mass approach each other with a relative velocity of 10 m/s, what is their relative velocity after the collision, which is presumed elastic?" I assumed that the balls have equal and opposite velocities of 10 m/s. Should the individual velocities be 5 m/s and -5 m/s...

I guess this is going to be my worst thread. I'm so sick of this stupid concept "relative velocity" that I'm in no mood to present this thread in my "exemplary style" for which i have been included in the "best homework threads" section. I'm sorry for that, but its true. I have no problems...

I have to make up or find a problem that invovles free fall velocity AND relative velocity! Can anyone find/make up a problem for that? HELP!

The term "Relative Velocity" has a somewhat vague definition in General Relativity - perhaps it doesn't really have a definition at all! What is the relative velocity of two observers with respect to one another when the spacetime that they are moving in is curved? In SR one compares the...

c) What is the relative velocity of the two reference frames?

I can't help but think maybe there's extraneous info?? Question: A rowboat crosses a river with a velocity of 3.30 mi/h at an angle of 62.5 degrees North of west relative to the water. The river is .505 mi wide and carries an eastward current of 1.25 mi/h. how far downstream is the boat when...

Relative velocity question -- plane and wind The distance between two cities A and B is l. An airplane travels back and forth between A and B, flying in a line, with velocity V relative to the air. (a) Find the total flight time, if the wind blows with velocity v, in a direction that forms an...

Hello all! My physics teacher has been absent for about two days so i haven't been able to ask him any questions. Basically I don't understand the concept of relative velocity. I couldn't even start one problem! 1) A Jet airliner moving intially at 300 mph due east enters a...

The question is like that. Q: A ship B is steaming on a straight course south-east at a uniform speed of 15km/h. Another ship A, is a distance of 10 km due north of B and steams at a speed of 12km/h. Find the course that A must steer in order to gets as close to B as possible, and their minimum...

Here is the question...Two boats are heading away from shore. Boat 1 heads due north at a speed of 3 m/s relative to the shore. Relative to Boat 1, Boat 2 is moving 40° north of east at a speed of 1.7 m/s. A passenger on Boat 2 walks due east across the deck at a speed of 1.1 m/s relative to...

:confused: I am in desperate need of help with a certian physice question I am struggling on. here's the question: "A pilot is required to fly directly from london to rome, in 3.5hours. the displacement is 1400km [S 43degrees E]. a wind is blowing with a velocity of 75km/h [E]...

I have a few questions here, and I'm stuck/confused on some of them. Here they are: 1. The air speed of a small plane is 215 km/h.The wind is blowing at 57 km/h from the west. Determine the velocity of the plane relative to the ground if the pilot keeps the plane aimed in the direction [34...

Hi, Can someone please check my work and tell me where I am going wrong? Rain is falling vertically downward with a velocity 25m/s. A cyclist is moving from North to South vith a velocity 15m/s. What is the velocity of the rain with respect to the cyclist? What is the direction the cyclist has...

What is everyone's views on relative velocity is General Relativity? Is it useless? Is it useful, if we make specific choices about how we parallel transport? Is there a definite relative velocity? Is there relative velocity at all? Or is there a better one than all the others?

An aeroplane starts from airport A to airport B, which is 600km away. The course (N) over ground from A to B is 30°. The wind is blowing with v(W) = 40 km/h from NW. The relative velocity is 200 km/h. can somebody pls explain to me how does the vector diagram looks like?? i don't know...

Hey. I've done this question, but my answer is only partly correct according to the answer book. Heres the question: "To a bird flying at 20km/h on a bearing of 160 degrees, the wind seems to be coming from the south at 25km/h. Find the true velocity of the wind" ok. I said that B is the...

could you solve this physics problem an aeroplane is flying in a triangular course of order. the length of each side of the triangle is " a " km and the wind is blowing along its one side with velocity u km/hr . prove that the areoplane will take a*sq.rt of 3(sq.rt of 3 +1)/2u hour to complete...

A jet airliner moving initially at 300 mi/h due east enters a region where the wind is blowing at 100 mi/h in a direction 27 degress north of east. What is the new velocity of the aircraft to the ground? This is how i did it: Vag=Vaw + Vwg Vag=? Vaw(aircraft relative to wind)= 300...

I have been pulling my hair out over this one. Here is the question: Assume that a river has straight and parallel banks and that the current is 0.75 m/s. Drifiting down the river, you fall out of your boat and immediately grab on to a log. You hold on for 40 seconds, and then swim after...

ok i have tried to draw this problem several times and i get different answers every time...my answers range from 804-880km/h and i can't get the degree down either...please help... an airplane pilot tries to fly directly east of the velocity of 800.0km/h if a wind comes from the southwest at...

A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 10 m/s. The student throws a ball along a path that he judges to make an initial angle of 60° with the horizontal and to be in line with the track. The student’s professor, who...

A plane can fly 100km/h in still air. It flies into a 10 km/h headwind. What is its groundspeed? Would this answer be 100 - 10 = 90km/h? Just making sure i didn't overlook something.

Pretty easy relative velocity question but I suck at Physics. I wanted to check my diagram and if it is not right than ask for help on a mathematical approach because mine is not working. The question is: An airplane, who air speed is 600 km/h, is supposed to fly in a straight path 35.0...

I have a problem that I cannot get the correct answer. An Astronomer observes electromagnetic waves emmitted by oxygen atoms in a distant galaxy that have a frequency of 5.71 *10^14 Hz. On earth, oxygen atoms emit waves that have a freq. of 5.841 *10^14. What is the relative velocity of the...

A boat is traveling 3 m/s relative to the water due north. A current is flowing 4 m/s due east. What is the velocity of the boat relative to the earth? The length of the river is 1000 m. Ok so I used pythogorean theorem and got 5 m/s. Then how would you find the time it takes for the boat to...

You row a boat perpendicular to the shore of a river that flows at 3.0 m/s. The velocity of your boat is 4.0 m/s relative to the water. a. What is your velocity of your boat relative to the shore? b. What is the component of your velocity parallel to the shore? Perpendicular to it? A was...

I have a couple of problems.. I'll show all my work... A swimmer wants to swim due east in a stream that flows due south. In which direction should the swimmer swim? The choices are east, north, northeast, south, southeast, and west... I chose Northeast. Here's another question... use...

You exercise by walking for 15 minutes on a treadmill that has a level track that moves at a velocity of -4km/h. What is your velocity relative to the treadmill? What is your velocity relative to the floor? What is your total displacement relative to the treadmill when you finish...

I'm not sure how to do this problem.. please help.. A river flows toward the east. Because of your knowledge of physics, you head your boat 53 degrees west of north and have a velocity of 6.0 m/s due north relative to the shore. a. What is the velocity of the current. b. What is your speed...

Relative Velocity? OK - I'm having problems visualizing a relative velocity problem. Please let me know if I am on the right track... problem involves a jet with initial V of 300 mi/h due east that encounters winds at 100 mi/h in a direction 30 degrees north of east. I need to calculate new...

"A helicopter is flying horizontally at 8.1 m/s and an altitude of 16 m when a package of emergency medical supplies is ejected horizontally backward with a speed of 13 m/s relative to the helicopter. Ignoring air resistance, what is the horizontal distance between the package and the helicopter...

Adding & Subtracting Vectors And Relative Velocity Hey everyone, I am so confused with this it's not funny. This is my first time accessing a site like thisss, but I am desperate seeing as though it's school holidays atm where I am and I can't talk to my physics teacher for help. Anyhow, I hope...

I want to measure the rotational speed of Io using a spectrograph, using the doppler formula. Since it is rotating around Jupiter, i have to take the velocity relative to jupiter, but I wonder tough how this is possible when Io is not rotating at an right angle to my observation point. Is there...

Hello I am new to this forum and I am desperate, I cannot figure this out, my professor gives us four assignments a year, on subjects that she will not lecture on at all and we have to read and find out on our own and right a report on it and then do four problems she chooses, well in theory I...

What is relative velocity? I have solved a lot of questions relating to it but I'm still confused what EXACTLY is it? Its in my maths book so my mathematics teacher was not able describe this in detail. One more thing: I'll be much pleased if someone also explains what is relative path. Thanks...

suppose there are 2 starships, A and B, moving towards each other wuth a relative velocity of 0.999c. they pass each other at time t=t0. after moving a certian distance (relative), they stop(relative to each other), turn around and again statr moving towards each other with the same velocity, of...

An object is thrown directly up (positive direction) with a velocity (vo) of 20 m/s and do= 0. How high does it rise (v = 0 cm/s at top of rise). Remember, acceleration is -9.8 m/s2. d =_______________m this is the problem I was given I think I am to use d= do + vot + 1/2atsquared...

Hmm... This is a chp in a-maths... I appear to be having a mental block regarding the vector diagram thingy... Help me please ? Thx... :cry: :cry:

I just found this site, AWESOME. Im having a problem this problem dealing with vectors: An airplane has a veloctiy of 300mph going North of East, and the wind is blowing eastward at a velocity of 100mph at an angle of 45 degrees from east, what is the plane's new velocity? is V naught=...

Before I get to the problem, Id just like to say a big thank you to all of you who help out and answer all of our questions. While many of them appear basic, to us they are daunting. It's nice to have a place to turn to when your professor barely speaks english and isn't a whole lot of help...

A man walks with a velocity of 2m/s due North on a ship, which moves due East at 3m/s. Find the relative velocity of the man to the Earth, in magnitude and direction. I do it this way: rel. vel. of man to ship = Vm -Vs Vm = rel. vel. of man to ship + Vs...

Ship A travels at 3m/s due NE, ship B travels at 2.6 m/s in direction S30E. a. What are the magnitude and direction of the velocity of ship A relative to ship B? b. After what time will they be 140m apart? I have found the answer to be 4.45m/s But I don't know whether it is true...and I...

I think I'm thinking to hard for this one, so I'll wait till tomorrow before checking up with you guys. I'll let my brain freshen up first. Yes, I have a "thing" for figuring it out on my own. Anyways, it's a question from David Hogg's book, so it is NOT my homework. Problem 2-8 Two...

I am having difficulty with Problem 49 of Chapter 3 from Physics for Scientists and Engineers by Paul A. Tipler, 4th Edition: Airports A and B are on the same meridian, with B 624 km south of A. Plane P departs airport A for B at the same time that an identical plane, Q, departs airport B...

The dispute over the truth of SR or not is passionately described in the context of relativity and the measurement of the speed of light. SR theorists impose the impossible physical consideration that in measuring the relative velocity of frame and photon that the frame is considered...

Anyone attempting to argue the Special Theory of Relativity needs to understand the basics of how light travels, and how we perceive it. Einstein wrote that the speed of light does not depend on the speed of the object emitting the light. To prove this, Einstein referred to De Sitter’s...

Hi there, i am a cambridge student studying in the first year of O levels. Though relative velocity isn't in my syllabus, ihave inerest in gaining knowledge about it. I studied the topic, but was unable to do some of the exercise questions. One question which i foind difficult is as...

Hey i would appreciate if some1 is able to help me out here... this is the question: A pilot wants to fly her plane to a lake that is 250.0km [N30.0'E] from her starting point. The plane has an air speed of 210.0km/h, and a wind is blowing from the west at 40km/h. a) Calaculate in what...

From the reference point of a photon, at what velocity are the photons around it traveling at? I'm asking it because doesn't light ALWAYS travel at light speed, no matter what the reference point? Does that principle only apply to things that are not photons or gravitational disturbances, or...

Hey I’m just having a bit of trouble with this relative velocity question: This is what I've got so far: Work so far. I think I've gotten a part a right, and I've made a start on a part b, but I am pretty much lost on part b (i) and (ii). Any help would be appreciated. (v =...