Energy in Nuclear Reactions: A hypothetical particle has a mass of 510 MeV/c2. If such a particle at rest decays into two gamma-ray photons, what is the wavelength of each photon? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
4.87 × 10-15 m
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Ancient philosophers and astronomers accepted without question-as first principles-that:
A) heavenly objects must move in circular paths at varying speeds. B) the planets are made of rock and gas, much like Earth. C) the Earth is motionless at the center of the Universe. D) there are many galaxies in the Universe.
Ganymede has many features that look like its history may be similar to the Earth's Moon's, but with water on Ganymede playing the role of rock on the Moon
Indicate whether the statement is true or false
Fluorescent bulbs have recently become much more efficient due to the introduction of
A) high-emission phosphor coatings on the inside of the bulb. B) new types of gases, that glow brighter, within the tube. C) lower density--i.e., lower pressure--gases within the tube. D) electronically controlled high-frequency ballasts. E) longer bulbs.
What is the gravitational force on a 20-kg satellite circling the Earth (radius = 6.4 × 10^6 m, mass = 6.0 × 10^24 kg) with a period of 5.0 h?
a. 88 N b. 55 N c. 36 N d. 98 N e. 18 N