All Questions
10
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Conceptual meaning of frame of reference for kinetic energy
what does the statement
The speed, and thus the kinetic energy of a single object is frame-dependent (relative)
even mean? does the impact of a collision of moving bodies and henceforth transfer of ...
5
votes
2
answers
850
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Does kinetic energy rely on the observer mass too since velocity is relative?
There is no 'correct' inertial reference frame according to relativity. Objects are only 'in motion' relative to an arbitrary inertial reference frame. So let us take the following example. A person ...
- 1,009
2
votes
3
answers
553
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If I accelerate through space, can I say all stars gain kinetic energy?
Suppose I accelerate through empty space. Say all stars are small heavy marbles I can use to do work with by means of their velocity. Say I can let them smash into some generator that turns their ...
0
votes
1
answer
31
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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 ...
- 2,797
0
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3
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125
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Kinetic energy of an object
We know that motion is relative. So let an object(o) be moving with a certain velocity with respect to an object (A).If another object (B) is moving with respect to (A) at a given moment and they ...
- 182
35
votes
5
answers
8k
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How am I able to stand up and walk down the aisle of a flying passenger jet?
The energy of a moving object is $E = mv^2\;.$ That is it increases with velocity squared.
I walk at say 3 miles per hour, or lets round that down to 1 meter per second for a slow walk. I weigh less ...
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1
vote
1
answer
129
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Reference frame and conservation of energy [duplicate]
Say spaceship $\alpha$ burns a portion of its fuel to leave planet A and is cruising through space at 10 m/s relative to the surface from which it launched. Spaceship $\alpha$ is being observed by ...
- 23
4
votes
2
answers
302
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Kinetics energy with different reference frame (a fighter plane shoots a bullet)?
Suppose a plane flies at 1km/s and shoots a 2kg projectile at 1km/s, so to the Earth the projectile flies at 2km/s with 2*2*2/2 = 4MJ.
The same gun, when fixed on Earth, shoots the same 2kg ...
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6
votes
2
answers
805
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Kinetic energy question
Thought experiment: I am starting to walk on a corridor. From the corridor's perspective I have a certain increase of kinetic energy. From my perspective the whole universe is gaining kinetic energy ...
- 309
1
vote
2
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368
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Perspective and changes in kinetic energy [duplicate]
Say you have two planes flying next to each other at the same speed and one decides to pick up speed by burning a tank of rocket fuel.
If someone on the ground wanted to know that plane's new speed ...
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