A beam of unpolarized light shines on a set of three polarizers as shown in the figure (imagine them stacked as a-b-c). The amount of light transmitted through them is
A. zero.
B. less than zero.
C. more than zero.
C. more than zero.
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A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotron?
A) 3.7 keV B) 7.8 keV C) 8.7 keV D) 7.8 MeV E) 8.7 MeV
A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the height of the image?
A) 0.8 cm B) 20 cm C) 4.0 cm D) -0.8 cm E) -20 cm
Which of the following best represents the energy transformations occurring in a wind-generated power plant?
A) electric ? thermal ? kinetic B) kinetic ? electric ? thermal C) thermal ? kinetic ? electric D) chemical ? thermal ? electric E) kinetic ? thermal ? electric
If VA ? VB = 50 V, how much energy is stored in the 36-?F capacitor?
a. 50 mJ
b. 28 mJ
c. 13 mJ
d. 8.9 mJ
e. 17 mJ