For an isotope with a half-life of one day, at the end of three days the amount that remains is
A) none.
B) one-half.
C) one-quarter.
D) one-eighth.
E) none of the above
Answer: D
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Stars X and Y have the same luminosity, but star Y is 10 times as far from Earth as star X. How much brighter will star X appear in our sky than star Y?
A) 10 times B) 100 times C) 1000 times D) 10,000 times E) 100,000 times
Because of its small size, the surface of Pluto was found by New Horizons to be old and geologically dead
Indicate whether the statement is true or false
White dwarfs are all about the same size
Indicate whether the statement is true or false
When a drag strip vehicle reaches a velocity of 65.0 m/s, it begins a negative acceleration by releasing a drag chute and applying its brakes. While reducing its velocity back to zero, its acceleration along a straight-line path is a constant ?7.10 m/s2 . What displacement does it undergo during this deceleration period?
a. 595 m b. 4.58 m c. 2 110 m d. 298 m e. 9.15 m