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
Life on Earth
W. A. Rogers’s engraving, “Out of the Game,” showed one injured boy tending to another. It appeared
In pretend play, toy figures and animals “come to life” and interact with each other.
The chemical structure of the water molecule facilitates life
What is the isotopic atomic mass of an isotope if 9.7023 1022 atoms weighs 4.0256 g?