Which of the following expressions is correct for the transmitted intensity of an unpolarized beam of light with an intensity Ii passing through a polarizer?
A) It = Ii
B) It = (1/2 ) Ii
C) It = (1/4 ) Ii
D) It = 2 Ii
E) It = 4 Ii
B
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A tractor T is pulling two trailers, 
and 
with a constant acceleration. T has a mass of 200 kg, 
has a mass of 100 kg, and 
has a mass of 150 kg. If the forward acceleration is 0.60 
then the horizontal force on the tractor due to the ground is
A. 270 N backward.
B. 270 N forward.
C. 150 N backward.
D. 150 N forward.
E. 90 N forward.
Future space stations will create an artificial gravity by rotating. Consider a cylindrical space station of 380 m diameter rotating about its axis. Astronauts walk on the inside surface of the space station
What rotation period will provide "normal" gravity? A) 28 s B) 39 s C) 6.2 s D) 4.4 s
vx is the velocity of a particle moving along the x axis as shown. If x = 2.0 m at t = 1.0 s, what is the position of the particle at t = 6.0 s?
?
?
A. ?2.0 m B. +2.0 m C. +1.0 m D. ?1.0 m E. 6.0 m
Both the refrigerator and the heat pump take in heat and expel it at a higher temperature. Why don't they have the same Coefficient of Performances?
What will be an ideal response?