An Earth observer sees a spaceship at an altitude of 920 m moving downward toward the Earth at a speed of 0.690c. What is the spaceship's altitude as measured by an observer in the spaceship?
a. 1270 m
b. 512 m
c. 1650 m
d. 666 m
e. 635 m
d
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What is the peak (maximum) power dissipated by a 150 W light bulb attached to a 120 V rms ac line?
A. 301 W B. 212 W C. 150 W D. 106 W E. 75.0 W
The graph above shows 4 models for how the average distance between galaxies could change with time, from the past (left) to now (middle) to the future (right-hand side). The graph also shows real data, based on white dwarf supernovae. Which model(s) predict(s) that galaxies will eventually get closer together?
A) accelerating B) coasting C) critical D) recollapsing E) all of them
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
Given two non-zero vectors, 
and 
, such that
, the sum 
satisfies
?
A.
.B.
.C.
.D.
.E.
.The proper abbreviation for ‘grams' is ‘g.'
a. True b. False Indicate whether the statement is true or false