The angular resolution of the eye is about 5 × 10-4 rad. The Moon is about 400,000 km from the earth and has a diameter of about 3500 km. What is the smallest feature on the Moon that can be resolved with the unaided eye?
A)
400 km
B)
1000 km
C)
100 km
D)
1.8 km
E)
200 km
E
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In the accompanying figure, which region represents approximately 80 percent of normal stars? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.
3.0 × 10^5 times 1.5 × 10^9 is equal to
a. 4.5 × 10^45. b. 4.5 × 10^14. c. 2.0 × 10^4. d. 2.0 × 10^14. e. 2.0 × 10^45.
A positron and its antiparticle, the electron, can annihilate each other and produce
A. high-energy photons. B. green electrons and anti-green electrons. C. protons and antiprotons. D. quarks and antiquarks.
Energy is released during a nuclear reaction due to a conversion between mass and energy. Mass is not conserved. The initial and final amounts are different. If a total of 1.0 gram of mass is "missing", how much energy has been released?
a. 9.0 × 10^11 J b. 9.0 × 10^17 J c. 9.0 × 10^15 J d. 9.0 × 10^13 J e. 9.0 × 10^16 J