Vision Problems: A nearsighted person has a far point of 50 cm for his right eye and 150 cm for his left eye. For each eye, what power contact lens will allow the person to see gorgeous sunsets?
What will be an ideal response?
-2.0 diopters (right eye), -0.67 diopters (left eye)
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Two masses are suspended by cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 5.0 kg and the other mass,
has a mass of 3.0 kg. The acceleration of 
is
A. 3.3 
upward.
B. 3.3 upward.
C. 2.5 upward.
D. 2.5 upward.
E. 1.1 upward.
Consider the solar system as a “system” of particles. Which of the below qualify as internal interactions (A) and which as external interactions (E)?
(a) The contact interactions between the earth and a car moving on the earth’s surface (b) The gravitational interaction between the earth and the International Space Station (c) The gravitational interaction between two planets (d) The gravitational interaction between a given planet and the sun (e) The magnetic interaction between the sun and the earth (both have magnetic fields) (f) The gravitational interaction between the sun and the larger galaxy
The place in a planet's orbit that is closest to the Sun is called:
A) vernal equinox. B) aphelion. C) perihelion. D) crossing the ecliptic. E) None of these; a planet's distance from the Sun never changes.
The SI unit of pressure is __________
Fill in the blank(s) with correct word