Calculate the kinetic energy (in eV) of a nonrelativistic neutron that has a de Broglie wavelength of 9.9 × 10-12 m. (h = 6.626 × 10-34 J ? s, mneutron = 1.675 × 10-27 kg, 1 eV = 1.60 10-19 J)
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8.4 eV
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When a spacecraft is launched from the earth toward the sun, at what distance from center of the earth will the gravitational forces exerted on it by the sun and earth cancel?
Earth's mass is 5.97 × 1024 kg, the sun's mass is 1.99 × 1030 kg, and the Earth-sun distance is 1.5 × 1011 m. A) 1.3 × 108 m B) 2.6 × 108 m C) 1.3 × 1010 m D) 2.6 × 1010 m
Explain why relativity allows us to travel, in principle, to the center of the Milky Way, but we would never be able to tell our friends back home about it
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Thin Lenses: Two thin lenses, one a converging lens and the other a diverging lens, are separated by 1.00 m along the same principal axis, as shown in the figure. The magnitude of the focal length of the converging lens is 25 cm, while the magnitude of the focal length of the diverging lens is 40 cm. An object 8.25 cm tall is placed 35 cm to the left of the converging lens.(a) Where is the final image produced by this combination of lenses? (Give your answer relative to the diverging lens.)(b) Compared to the object, is the final image upright or inverted? Is it real or virtual?
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Observations of young stars suggest that when the Sun was young, the solar wind
A) was weaker than it is today. B) was stronger than it is today. C) was about the same strength as it is today. D) was nonexistent. E) blew outward only along the Sun's poles.