Three boxes slide on a frictionless horizontal surface when pulled by a force of magnitude F. When we compare the tensions 
and 
with the force F, we find that
?
?
?
A.
= 
= F.B.
= F>.C.
= .D.
>.E.
<? .Answer: D
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The Palomar reflecting telescope has a parabolic mirror with an 80-m focal length. What is the magnification achieved when an eyepiece of focal length 2.5 cm is used?
a. 800 b. 1,100 c. 1,600 d. 3,200 e. 2,000
Pressure in a Liquid: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the absolute (total) pressure p on the bottom of this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
A person looks straight down into a large cube of glass. Three cm below the surface is a bubble. How far below the surface does the bubble appear to the person?
What will be an ideal response?
If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction?
(1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg) A) 0.35 kg B) 1.75 kg C) 390 kg D) 1.1 × 108 kg E) 3.3 × 108 kg