The time rate of change of the position of an object

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-1
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3answers
71 views

Are all conserved scalars proportional to relativistic mass? [closed]

I have read in Rindler's relativity book that all scalars depend only on the magnitude of velocity of a particle and that are conserved are proportional to relativistic mass. ...
0
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1answer
51 views

Empty space and velocity

If there was a universe without anything in it except you in a space rocket how you would you know what your velocity if you kept the engine on?
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1answer
66 views

Objective velocity (Relativity theory) [closed]

Suppose that I have a velocity of (approximately) $c$. Then I decelerate with $c$ per hour for exactly one hour. Then I would know that I would be standing still in the end, because the decelleration ...
0
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0answers
37 views

Calculating electricity used for weights on an elevator

Given an elevator with a motor driven by a power supply, torque ability and a pulley does it take more electricity to lift more people? I have some of the calculations but do elevators lift at a set ...
0
votes
1answer
36 views

Finding acceleration using components method

The problem I am working on gives me an initial velocity of 2[E15N] m/s and a final velocity of 4[E35N] m/s after 30s. I need to find acceleration so I create a right angle triange for both of these ...
0
votes
1answer
47 views

Having trouble understanding projectile motion [closed]

So, I learned about projectile motion in class a fe days ago, and am having trouble understanding. I main problem is seeing how velocity works in projectile motion. For example, why is the velocity in ...
1
vote
0answers
25 views

How can a net force of 0 still lead to movement and how is movement possible with interaction pairs? [duplicate]

So I always thought of movement as interaction pairs. For example, I thought that a rocket moves by applying a force of hot exhaust gases, which then apply a reaction force back on the rocket ...
2
votes
1answer
54 views

Difference between escape velocity and speed [duplicate]

What is the difference between escape velocity and escape speed , is their any error if we use them interchangeably?
0
votes
1answer
98 views

Question about acceleration & deceleration in real world?

have searched the net and am not satisfied with any answer I have found to calculate the following:- Here is an example just for reference. Suppose I can accelerate my car from 0-100km/h in 10s. That ...
1
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1answer
45 views

At what velocity was this car traveling? [closed]

Throughout schooling we are given problems in which we are to solve for velocity, force, mass, etc. I have a real life situation in which I would love to solve these exact things. Please consider: Car ...
5
votes
5answers
476 views

Why is rapidity additive?

With the rapidity $\phi$ defined so that $\frac{v}{c}=\tanh{\phi}$, say you have 3 parallel moving reference frames $S$, $S'$ and $S''$ with a constant but different velocity/rapidity. If the ...
0
votes
2answers
59 views

motion with constant acceleration question! [closed]

Consider a motorboat maneuvering on the surface of a lake, Is it possible for the boat to have accelerated motion in the x axis and unaccelerated motion in y direction?
0
votes
1answer
58 views

Velocity of a liquid jet, coming out of a container

Think of a container which has a hole beneath it. And we have filled the container in height $h$ with a liquid of density $\rho$ and cross section of the hole $a$. (look at the pic) Then what is the ...
1
vote
0answers
24 views

How does a bikerider turn by leaning on one side? [duplicate]

I am trying to understand the following image: Could someone please help me understnding it. What I understood so far: Your angular velocity mutyplied by the impulse gives you the impulsemoment. By ...
2
votes
1answer
48 views

Why is the potential independent of the generalized velocity?

In Goldstein, Classical Mechanics, Chap. 1.4 we derive Lagrange's equations from D'Alembert's Principle. My question is regarding the last part of the derivation, specifically the part where he ...
0
votes
2answers
86 views

Calculate velocity with acceleration caused by drag

Maybe someone can help me with calculating the velocity of a sphere falling down. Initial: Acceleration is $10 ~\rm \mathrm{m/s^2}$. Timestep is $1 ~\rm s$. Approximation of drag = ...
0
votes
1answer
569 views

Jumping from a moving train

If you were to jump from a moving train at 20 km/h, would it be better to run in the direction of movement before jumping to maintain inertia or in the opposite direction of the train ?
0
votes
0answers
30 views

Real and relative velocity formula

What i need is a thing more complicated than the usual relative velocity formula. Imagine a radar. You are at the center, moving at some angle, but lets make it clear, you are always at the center. ...
0
votes
2answers
400 views

Velocity time graph for a ball thrown vertically upwards and falling back down to be caught again by a person

I am currently studying AS level physics and having some difficulty understanding the shape of a velocity time graph that represents the motion of a ball being thrown upwards and falling back down to ...
-1
votes
3answers
81 views

Velocity of water from a certain depth

I was curious to know does water come out of a certain depth when there is a difference in pressure, and also if it does come out of a certain depth, at what velocity does it travel at? So, ...
0
votes
0answers
17 views

Do we have the potential technology to harness the energy the Earth is constantly giving us? [duplicate]

Messing around with fun physics, and it got me thinking. I probably am not the only or the first one to think of it. I am wondering what more experienced physicists on this site can contribute to this ...
0
votes
0answers
50 views

Elastic Collision of Infinitely Large Body and an Infinitely Small Body

So I guess this is a somewhat conceptual question. There are two bodies, one with a mass $m$ that is so light it is massless and at rest so $v_{_i1} = 0$ And the other with mass $M$ that is almost ...
0
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0answers
14 views

Representing variable velocity in cellular automata

I've read through some of the more non-physicist accessible material on cellular automaton, touching on digital physics etc and I am somewhat confused about methods to reason with variable velocity in ...
-3
votes
1answer
153 views

If an object's acceleration is zero, can its velocity be non zero?

Question: If an object's acceleration is zero, can it's velocity be non-zero? Explain by giving an example. My Attempt: This doesn't make any sense at all. Via my teacher's solution ...
0
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0answers
13 views

Calculate distance with variable acceleration [duplicate]

I know the time and I know the force that acts horizontally on a particle. The problem is that the force is F=k(D-V), where k and D are constants. So at the beginning where the particle has zero ...
0
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0answers
46 views

What's the formula to determine how fast a magnet can travel and still hold objects in it's magnetic field?

If an object (an iron ball) is locked (suspended) in the magnetic field being produced by a magnetic bar, what is the maximum velocity at which the bar can be moved before the iron ball is disturbed ...
1
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1answer
79 views

Tachyons and Lorentz velocity transformation

In general, is it possible to apply the Lorentz velocity transformation to a tachyon? I have tried to do so but the results seemed very illogical. Here's my attempt: suppose an evil spaceship named ...
0
votes
3answers
347 views

How to prove the average velocity formula without calculus

I often see the formula: $$ \overline v = \frac {v + v_0}{2} $$ in physics textbooks, to describe the average velocity for an object moving with constant acceleration. This formula is often ...
1
vote
1answer
62 views

Can 3 objects be collinear?

Suppose there are 3 objects floating in some space, without anything else besides this 3 objects. Is there any way for them to end up collinear at any given moment (assuming they start at completely ...
1
vote
2answers
150 views

Elastic collision between two circles [duplicate]

I am trying to calculate the final velocities of two equal mass 2-dimensional circles after an elastic collision. I have tried to figure it out using formulas I know from high school physics, but ...
1
vote
1answer
39 views

Find the height and the velocity of the object [closed]

A bolt is detached from the lower part of an elevator cabin that is ascending with velocity 6meters/second and for 3 seconds comes to the point from where the elevator started to ascend. Find: in ...
2
votes
2answers
286 views

What is the relationship between rolling resistance and velocity?

I'm a games programmer, trying to write a simple car physics simulation. I'm aware that a car travelling in a straight line will exert a traction force that drives it forwards (by turning the wheels ...
1
vote
3answers
144 views

Can a particle have no instantaneous velocity at all points of the path taken but a finite average velocity?

I have a question on kinematics. Say the path traced by a particle is given by a Koch curve or Koch snowflake. Now consider the particle starts from some arbitrary point $A$ on the curve and ...
1
vote
0answers
27 views

Escape speed or Escape Velocity? [duplicate]

Which one should be the correct term escape speed or escape velocity? In one book it is given Speed whereas in another its velocity.
0
votes
1answer
79 views

Cumulative distance formula

I am working with position recordings over time. Basically, I record the position of animals in a treadmill. They can go forwards or backwards. Hence, position can increase or decrease. However, I am ...
1
vote
0answers
44 views

Lining up fans in a row

Im new to this website, and not extremely educated in the world of physics. I have a very basic (mostly high school, some college) understanding of physics. That being said, I work for the fire ...
0
votes
1answer
61 views

Why do objects change its direction when their velocity reaches 0?

When you throw an object into the air, the object will decelerate by 10 or 9.8 meters per second per second due to gravity. When the object reaches its highest point, the objects velocity would be ...
0
votes
1answer
42 views

Calculating constant velocity from friction [closed]

I'm unsure if my Book is wrong. Either way, we send a pinball through a cylinder filled with oil, the forces that apply are. Fpinball = 15,8 ∙ 10^−6 ∙ 9,82 = 5,69 ∙ 10^−5N Foil = 𝜌 ∙ 𝑔 ∙ 𝑉 = ...
-1
votes
1answer
33 views

Velocity and acceleration (as vectors) in a straight line

A student is trying to determine the acceleration of a feather as she drops it to the ground. If the student is looking to achieve a positive velocity and positive acceleration, what is the most ...
0
votes
2answers
44 views

How can I calculate the change in velocity? [closed]

"A runner runs at 4 m/s on a circular track constantly. A and B are opposite points on the track, so A is the starting point and B is halfway around the track. Calculate his change in velocity from A ...
0
votes
1answer
23 views

Equation for Turning Projectile

I'm trying to cook up an equation that will give me position for a projectile which operates in the Newtonian Domain. So a the fall equation is: $$\mathbf{p_t} = \frac{\mathbf gt^2}{2} + ...
0
votes
1answer
84 views

How to determine when to decelerate to reach a destination at 0 velocity?

(Sorry, not sure whether this belongs here on the Physics StackExchange or the Math StackExchange.) I'm creating a computer game in which there is a computer-controlled car that needs to travel along ...
0
votes
0answers
25 views

Help with a problem in magnetism, kinetic energy

I couldn't fully understand how the author solved the problem c). Here's what was done: At first I thought he changed $v$ for $\sqrt{\frac{2K}{m}}$ in the equation $r=\frac{mv}{|q|B}$, but ...
1
vote
1answer
219 views

Understanding rotational motion on a rough surface

I am having trouble gaining an intuitive understanding of rotational motion for an object rolling on rough surface, and I have a few questions regarding it. Let's say that there's a cylinder that ...
0
votes
1answer
18 views

Need to find module of magnetic field

I have a post-lab problem During the experiments I have a U magnet on a scale. Inside the U magnet there is a conductor with a steady current. The conductor is made so that the magnetic field is ...
0
votes
1answer
40 views

Calculating position of a particle at time $t$ in a gravitational field

I'm working on a piece of code that is supposed to visualize a particle bouncing up and down from the ground (somehow magically we can give it velocity upwards when it is on the ground). I figured ...
0
votes
2answers
84 views

Obtaining Velocity from Acceleration

I'm following a research paper (PDF via RG), part of which is about using the accelerometer of a smartphone to assist the user's positioning via WLAN. Accelerometer is used to determine if the user ...
1
vote
1answer
80 views

Relativity: easy spaceship scenario. easy questions [duplicate]

Your spaceship is traveling at 1/2*c and you approach Bob's spaceship going -1/2*c in the opposite direction. Relative to you, Bob is going the speed of light, and of course he has a giant ticking ...
1
vote
2answers
199 views

Terminal Velocity of 100lb Hail [closed]

In the Apocalypse there is meant to be hail weighing 100 pounds or 45 kg. What would the terminal velocity be, assuming the hailstones are perfect spheres of solid ice? Also, is there a way to guess ...
0
votes
0answers
58 views

Position from acceleration, or acceleration from position, to track an object moving the speed of sound

I'm working on a project that involves tracing the motion of a fast-moving object (approx the speed of sound) through a fairly defined trajectory. Would it be more accurate to measure the position of ...