An alpha particle (mass = 6.68 × 10^-27 kg) is emitted from a radioactive nucleus with an energy of 6.22 MeV. How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10^-13 J)
a. 3.70 × 10^6 m/s
c. 1.55 × 10^7 m/s
b. 1.73 × 10^7 m/s
d. 1.85 × 10^6 m/s
B
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Kepler's Laws: Halley's Comet is in a highly elliptical orbit around the sun. Therefore the orbital speed of Halley's Comet, while traveling around the sun,
A. is constant. B. increases as it nears the Sun. C. decreases as it nears the Sun. D. is zero at two points in the orbit.
Kepler's Laws: Two moons orbit a planet in circular orbits. Moon A has orbital radius R, and moon B has orbital radius 4R. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A. 20 days B. 80 days C. 160 days D. 320 days E. 5 days
Which of these numbers is closest to the number of barbers in the US?
1.10,000 2.300 million 3.1000 4.200,000
Two small forward-facing speakers are 2.50 m apart. They are both emitting, in phase with each other, a sound of frequency 1100 Hz in a room where the speed of sound is 344 m/s
A woman is standing opposite the midpoint between the speakers and is initially 35.0 m from the midpoint. As she slowly walks parallel to the line connecting the speakers, at what angle ? (relative to the centerline coming outward from the midpoint between the speakers) will she first hear no sound? A) 1.8° B) 7.2° C) 3.6° D) 11° E) 0.063°