How is Pluto now classified by astronomers?
A. as a planet
B. as a comet
C. as a dwarf planet
D. as a star
E. as an asteroid
Ans: C. as a dwarf planet
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A person looking through eyeglasses sees
a. real images b. virtual images c. erect images d. inverted images e. polarized images
An electron and a positron, each having kinetic energy 1.843 GeV, annihilate, producing a proton and antiproton pair (M = 938.3 MeV/c2). What is the kinetic energy of the antiproton produced in this way?
A. 0.938 GeV B. 0.905 GeV C. 1.586 GeV D. 1.843 GeV
A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = 1.60 × 10-19 C)
A) 13 × 10-16 N B) 6.7 × 10-16 N C) 0 N D) 3.4 × 10-16 N E) 4.2 × 10-16 N
Thin Lenses: An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm. What is the magnification?
A. -0.10 B. 0.10 C. 0.15 D. 0.20 E. -0.20