
PHY 240 FINAL REVIEW
Authored by Angel Flowers
Physics
University
NGSS covered
Used 3+ times

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33 questions
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1.
OPEN ENDED QUESTION
15 mins • 1 pt
2-D Velocity Transforms: So I’m sitting in
my space station minding my own business with my
alien friend, Yalgrae when all of a sudden the alarm goes
off! We are being attacked by the evil Druqon! We hop
in our space pods and leave the station. I travel in (what
I am calling) a positive x-direction at 0.825c, whereas
Yalgrae leaves in the direction shown at 0.750c. As I
look back, (a) what is the x-component of Yalgrae’s
velocity that I observe? (b) What is the y-component of
Yalgrae’s velocity as observed by me, and (c) in what
direction do I see Yalgrae’s moving? (d) In what direction
does Yalgrae see me moving?
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2.
OPEN ENDED QUESTION
15 mins • 1 pt
Work and Energy: (a) What is the electric
potential at the origin in the picture shown? (b) Determine the
work done in moving a charge, q4= +5.0e from infinitely far
away to the origin in the picture shown. (in eV and J)
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Tags
NGSS.HS-PS2-4
NGSS.HS-PS3-5
3.
OPEN ENDED QUESTION
15 mins • 1 pt
Find the momentum, kinetic energy, and total energy of a Pfeileon (rest mass=425
MeV/c2) moving at a speed of 0.742c
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Tags
NGSS.HS-PS2-2
NGSS.HS-PS3-2
4.
OPEN ENDED QUESTION
15 mins • 1 pt
Relativistic Energy: The figure to the right shows the relativity
mnemonic triangle for six particles; the hypotenuses 2 and 4 have the same
length. Rank the particles according to (a) rest mass, (b) momentum
magnitude, and (c) Lorentz factor, γ, greatest first. (d) Identify which two
particles have the same total energy. (e) Rank the three lowest-mass particles
according to kinetic energy, greatest first.
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Tags
NGSS.HS-PS3-2
NGSS.HS-PS3-1
5.
OPEN ENDED QUESTION
15 mins • 1 pt
What is an “inertial” reference frame? Is this classroom an inertial reference frame?
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Tags
NGSS.HS-PS2-2
NGSS.HS-PS2-1
6.
OPEN ENDED QUESTION
15 mins • 1 pt
Our Good Friend Al: Please state, or explain, Einstein’s two fundamental
postulates of special relativity.
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7.
OPEN ENDED QUESTION
15 mins • 1 pt
What is the “correspondence principle” Does it hold for the special relativity we have
been working with in class?
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