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
Question 2
Most asteroids are oblong in shape. Approximate an asteroid as being made up of two identical spheres of mass M and radius R that are just touching each other, in a figure eight.
In terms of G, M, and R, what is the escape velocity for a spaceship taking off from the top of the figure eight? A) (2GM/R)1/2
B) (4GM/3R)1/2
C) (8GM/3R)1/2
D) (3GM/R)1/2
E) (7GM/5R)1/2
1–12 Elements essential to animal life and health
The Krapina remains may provide evidence of cannibalism by some Neadertals.
palaeous life
Life cycle of Plasmodium vivax
What is the meaning of life?
An electrochemical cell is based on these two half-reactions