Questions tagged [relative-motion]

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Mechanical Work of that cases [closed]

What's the formula of mechanical work for every point ? B) mechanical work (w) = k*e What about the rest ? Much thanks
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A question on time taken in different frames of references

Let us say , a swimmer has to swim upstream and downstream a river , between two points which are at distance "L" from each other . The swimmer can swim in still-water at velocity "Vs&...
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Apparent wavelength received by observer in doppler's effect

I have a few doubts about Doppler's effect. Does the apparent wavelength received by the observer depend upon whether the observer is moving or not? $λ_{apparent}=\ \frac{v_{sound}\pm v_{source}}{f}$....
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On a rainy day, a man is running on a hilly terrain in such a way that he is always finding the rain drops hitting him vertically

It is assumed that rainfall is uniform in the whole terrain from O to E(figure attached) When the man was at rest on stretch OA, he found the rainfall at an angle of $30^o $ with the vertical. What ...
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Very basic special relativity (relative velocities)

My question involves broadly why calculating different (Einstein) relative velocities give different answers: Say we have car 1 traveling in front of car 2. Car 1 goes at velocity $3c/4$, while car 2 ...
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Relative position from two reference frames

Here, clearly $\vec{r}_{S'S} + \vec{r}_{PS'}= \vec{r}_{PS}$. Then we differentiate and double differentiate and get the standard equations of relative velocity and acceleration. Now according to my ...
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Why do we say the resultant vector as the relative motion in this case?

If a car A moves with acceleration $2m/s^2 $due east and car B moves $1m/s^2 $due north. What would be the acceleration of car B with respect to car A. Now , for this. The solution in my textbook is ...
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1answer
23 views

Velocity Gradient and Force in Air

I have experienced that when we go on a bike at a high speed, keeping our hands close to the surface of the bike is not much a problem and we feel negligible force which the air applies on us. But as ...
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Does the relative motion of the shadow of a body moving in a refrence frame change?

Does the relative motion of the shadow of a body moving in a refrence frame change? The surrounds and shadows are in motion with respect to body. But parts of the body are in rest relative to the body....
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2answers
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Do time dilation affects motion? [closed]

I know it doesn't but why not? Imagine when time dilation becomes Infinite then everything will stop or not? What will happen to a ball which hypothetically move at the speed of light so that space ...
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Does Coriolis effect change the direction of an object moving parallel to equator, say along the tropic of Cancer?

It is usually said that the Coriolis force deflects a horizontally moving object to its right in the northern hemisphere and to the left in the southern hemisphere, and an object at the equator will ...
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4answers
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What is Relative and Absolute? [closed]

I was studying about relative motion, and randomly thought about What actually is a Relative Term or a Absolute Term. So far in the school book it is written that, Quantities that depends on a ...
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Speed of one frame with respect to another in special relativity [duplicate]

To derive the Lorentz transformation we begin with the general relationship between two frames as below: $x' = Ax + Bt$ $y' = y$ $z' = z$ $t' = Cx + Dt$ If frame $S'$ is moving at speed $v$ with ...
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${}$Reference frames [duplicate]

Most of the particles have different velocity in different reference of frames but why is speed of light the same in all refrence frames? After all light is made of a photon.
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Can I apply Newton's equations of motion to relative motion?

We know that Velocity of A relative to B is $$ \vec v_{A|B} = \vec v_A - \vec v_B $$ and Acceleration of A relative to B is $$ \vec a_{A|B} = \vec a_A - \vec a_B $$ So, is it correct to do this to ...
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Question regarding relative velocity of muzzle bullet? [closed]

A police jeep is chasing with, velocity of 45 km/h a thief in another jeep moving with velocity 153 km/h. Police fires a bullet with muzzle velocity of 180 m/s. The velocity it will strike the car of ...
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Determination of the speed and angular velocity of 4 rolling cylinders between planks

According to the picture, there are four identical cylinders, with radius R, that are rolling without slipping at every contact point. The upper plank is moving with speed 2v (m/s) towards the right, ...
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1answer
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Why is direction of train like this for car?

This is an image of a train and a car. T is the train moving towards - $x$ axis and C is the car moving towards $+ y$axis. So, my teacher made a resultant velocity with $-5\hat i$ and $-20\hat j$. ...
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2answers
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Is this correct regarding velocity of train?

So many yellow T drawn are just different position of train at different instants.The person is standing still at all those instants at one place. If a train is moving at 5m/s. Then for me , can we ...
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Direction of $V_RM$ confusion

So ,please read both the questions . They have similar originate questions that I am facing difficult in. Let us say rain is falling downwards with v = -5j and a man is moving with a velocity of 2i in ...
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Confusion in relative velocity with rain man problems

My major conceptual difficulty in understand this concept is mostly the direction of velocity of man with respect to rain. Let us say rain is falling downwards with v = -5j and a man is moving with a ...
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Discretizing kinematics of moving object

I think this is a simple question, but I'm unable to find the relationship: The relative distance between two objects at any time $t$ can be written as: $x_r(t)=x_{ro}+\int_{t_0}^{t_f}v_r(t)dt$ where: ...
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What do you think of the idea of measuring macroscopic Special Relativistic-kinematic time dilation by placing atomic clocks onto moving dollies?

We first attempt to synchronize two stationary clocks placed apart, and we assume we succeed using the Einstein synchronization convention. Then, we run a third clock along a dolly at a constant speed....
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1answer
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Relative speed of satellites in different orbits [closed]

The question is "The Hubble Space Telescope is in orbit around the Earth at a height of 560km above the Earth’s surface. Take the radius and mass of the Earth to be 6.4×10^ 6m and 6.0×10^24 kg, ...
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Is this an exception to Newton's Second Law of Motion?

If a ball in an experiment is dropped from two different heights, 6 feet and 12 feet, why would we need to exert more force when we catch the ball that is dropped from the height of 12 feet? According ...
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Why is relative motion at constant velocity the same as being at rest?

If I am a passenger who plays catching-the-ball game inside a vehicle that moves with a constant velocity in a straight road, why can I catch the ball repeatedly that as if the vehicle is at rest? How ...
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Not able to understand relative velocity in 2dimension?

I have a body A = 4j and B = -3i Their relative velocity = -3i-4j. But the position is somewhere they both don’t even meet. It should be from B to A but it form C to A or B.Not able to understand what ...
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How does the orbital motion of reduced mass tell us how the individual planets/stars move?

To give context to my question, here is Kepler's first Law restated in terms of reduced mass. Here, $\vec{r}$ is the position vector of the reduced mass whose origin lies at the centre of mass of the ...
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4answers
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I want to know the difference in two methods I have solved [closed]

A thief is driving away on a straight road in jeep moving with a speed of 9 m/s. A police man chases him on a motorcycle moving at a speed of 10 m/s. If the instantaneous separation of the jeep from ...
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1answer
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Time dilatation - relative movement

Sorry for eventual factual errors, I am just hobbyist. A spaceship flies with nearly speed of light away from earth and back. Time on board were going slower than on earth during flight, so back on ...
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Does the magnitude of heat energy given or taken the same in any reference frame

So the question consists of two parts- The random motion of the particles is equivalent the amount of heat energy. The velocity of collective motion does not result in heat energy. For example take ...
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Simple Harmonic Motion example [closed]

https://en.wikipedia.org/wiki/Escalator https://en.wikipedia.org/wiki/Simple_harmonic_motion Can we classify escalator device as a Simple Harmonic motion example?
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3answers
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What really pushes a rocket up?

To launch a rocket, fuel is burnt and is released in opposite direction relative to rocket and it pushes the rocket upwards because of third law of motion but the fuel molecules are not actually ...
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How does motional EMF emerge from Jefimenko's Equations?

I have been using Jefimenko's Equations for determining the electric and magnetic fields of a conductive coil with a (possibly changing) current. For most situations of interest this can be done to ...
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To measure its absolute rotation, wheel rotation stopped while oriented North-South and then orientation just changed to East-West

If there is no influence of Earth rotation on a highly balanced wheel positioned freely to rotate with no friction on a firm construction and perpendicular to the ground and while changing its ...
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Coriolis force and liquid on a rotating space station?

On a rotating wheel space station crewed by humans with sea-level conditions (temperature above the freezing point), if liquid was spilled on the floor am I correct in understanding that the Coriolis ...
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Questions About Highly Coupled Magnetic Resonance

This is one of very few in-depth sources of information I can find online about Highly Coupled Magnetic Resonance: The last sentence of the third-to-last paragraph says that research is underway that ...
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2answers
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Can we prove the Earth rotation with a disk mounted in its center on a frictionless axis?

Can somebody prove the rotation of Earth if it places an uniform disk with a hole in its the center on an axis and orient it paralelly to Sun ecliptical disk?Just assure himself that the disk on the ...
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Swing in moving truck

I was just thinking about a situation in which a big truck is moving in high speed say ( $80 \ miles/hr$). There is a swing attached with the ceiling of the truck container which can move freely in ...
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Calculating unknown Relative Velocity from Given 2 Known Relative Velocities for speeds comparable to speed of Light

Dear fellow physics lovers, Given 3 objects A, B and C, travelling with relative velocities such that $\vec{v_{AB}}$ = Velocity of Object A with respect to Object B $\vec{v_{BC}}$ = Velocity of Object ...
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Kinematics in moving reference frames

Assume we have an object moving along a path $p_W(t)$ that is described in some fixed reference frame $W$. If we now have a second reference frame $B$ which differs from $W$ by some time varying ...
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Why does the relative motion go wrong here?

Question statement: A rocket is moving in a gravity free space with a constant acceleration of 2ms−2, along + x direction (see figure). The length of a chamber inside the rocket is 4 m. A ball is ...
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Doesn't this experiment signify that inertial frames are not equivalent? [duplicate]

When we talk about kinetic energy of a body, it is actually the combined kinetic energies of all the atoms in that body. Now suppose a body is at rest. So its atoms would have some internal random ...
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Relative Motion in Two Dimensions

There's a problem that I've been working on in physics for a couple of days now, and I'm just wondering if my thinking is wrong here. Say you're given the velocity of an object (with an x- and y-...
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Relativistic or non relativiistic mechanics?

Question: A train of length $l=350 metres$ starts moving rectilinearly with the constant acceleration $a=3×10^-² ms^-²$; $t=30s$ after the start the locomotive headlight is switched on $(event 1)$, ...
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Motion of Points around a Triangle [closed]

I came across this problem in the book "Problems in General Physics by IE Irodov"- Three points are located at the vertices of an equilateral triangle whose side equals s. They all start ...
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Velocity Question from grandparent

My Grandparent asked me this question a few years ago, and I am getting around to giving him an answer, but I don't know the answer. Can anyone help? "A pickup truck is speeding along a highway ...
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Relative motions, between inertial and non-inertial frames or bodies

I had no other way to put my problem to you guys thus I am taking an example.... Here, ...
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3answers
135 views

Coriolis effect vs preservation of angular momentum on merry-go-round, sniper's bullet, hovering helicopter and high altitude rockets

I understand that how helicopter hovers at the same position or a thrown ball falls to the same position even though earth is spinning. This is due to the preservation of angular momentum and my ...
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4answers
108 views

Why motion is not absolute or relative to space?

We say that motion isn't absolute.but why?if we measure motion relative to "space" it will be absolute for all observers. isn't it? Is space also relative like motion? If space has no "...

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