Projectile Motion: For general projectile motion with no air resistance, the vertical component of a projectile's acceleration
A. is always zero.
B. remains a non-zero constant.
C. continuously increases.
D. continuously decreases.
E. first decreases and then increases.
Answer: B
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Indicate whether the statement is true or false
Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the force
the floor exerts on the first person to the force 
the rope exerts on the second person. Which statement is correct?
a.
They are equal and opposite in direction.
b.
They are equal and have the same direction.
c. is greater than but they have the same direction.
d. is greater than they have opposite directions.
e. is less than , but they have the same direction.
Microtechnology began
A) about 60 years ago with the invention of solid state transistors. B) in the 1990s with the use of computers. C) with the development of micron chemistry in the early 1800s. D) at the close of World War II.
If the energy of n = 6 is –0.378 eV and that of n = 4 is –0.850 eV in a hydrogen atom, a transition from n = 6 to n = 4 will emit a photon of what energy?