Author Question: Approximately how many times does an average human heart beat in a lifetime? A) 3 1011 B) 3 ... (Read 59 times)

silviawilliams41 · **on:** Jul 29, 2018

Approximately how many times does an average human heart beat in a lifetime?

A) 3 1011
B) 3 1010
C) 3 109
D) 3 108
E) 4 107

Question 2

A baseball is thrown vertically upward and feels no air resistance. As it is rising

A) both its momentum and its mechanical energy are conserved.
B) its momentum is not conserved, but its mechanical energy is conserved.
C) both its momentum and its kinetic energy are conserved.
D) its kinetic energy is conserved, but its momentum is not conserved.
E) its gravitational potential energy is not conserved, buts its momentum is conserved.