3. In so-called "natural units" (which is just a sneaky way to let us ignore a bunch of constants), the relativistic kinetic energy of a rigid body is given by the formula 1 ΚΕ m V1– v2 where m is the rest mass of the body and v is its relative speed. Alien scientists on a space station are observing an object falling into a black hole. As the object falls, it is disintegrating, losing mass at a rate of 3 (so its mass is changing at a rate of -3). How fast is the kinetic energy of the main part of the object changing when its mass is 20, its velocity is .7, and it is accelerating at a rate of .1 (remember that acceleration is the derivative of velocity with respect to time: a = )?
3. In so-called "natural units" (which is just a sneaky way to let us ignore a bunch of constants), the relativistic kinetic energy of a rigid body is given by the formula 1 ΚΕ m V1– v2 where m is the rest mass of the body and v is its relative speed. Alien scientists on a space station are observing an object falling into a black hole. As the object falls, it is disintegrating, losing mass at a rate of 3 (so its mass is changing at a rate of -3). How fast is the kinetic energy of the main part of the object changing when its mass is 20, its velocity is .7, and it is accelerating at a rate of .1 (remember that acceleration is the derivative of velocity with respect to time: a = )?
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
Transcribed Image Text:dx
4x
3.
In so-called "natural units" (which is just a sneaky way to let
us ignore a bunch of constants), the relativistic kinetic energy of a rigid
body is given by the formula
1
КЕ — т
V1 – v2
where m is the rest mass of the body and v is its relative speed.
Alien scientists on a space station are observing an object falling into a
black hole. As the object falls, it is disintegrating, losing mass at a rate of
3 (so its mass is changing at a rate of -3). How fast is the kinetic energy
of the main part of the object changing when its mass is 20, its velocity
is .7, and it is accelerating at a rate of .1 (remember that acceleration is
the derivative of velocity with respect to time: a =
dt
1Note that this formula does not make sense when v > 1. That is because in natural units,
a speed of 1 corresponds to the speed of light, and nothing with positive rest mass can go that
fast.
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