When a meteoroid enters Earth's atmosphere, it is called a(n) ______________
Fill in the blank(s) with correct word
meteor, or "shooting star"
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The rotation curve method works:
A) only for galaxies near enough to be well resolved. B) only for distant spiral galaxies. C) only for elliptical galaxies. D) for all galaxies, irrespective of their distance from Earth.
The escape velocity from the Moon is 2.4 km/s. If an astronaut hits a golf ball such that it just reaches this speed, the ball will ________.
A. follow a very elliptical orbit around the Moon B. continue moving away from the Moon, never to return C. move away from the Moon, but return some time later D. either orbit the Moon or escape its gravitational pull, depending on the direction the ball is hit
A single slit is illuminated at normal incidence with a parallel beam of light having a wavelength of The entire central band of the diffraction pattern is observed at ±90°
The illumination is now replaced by a nonrelativistic beam of electrons, each having a kinetic energy of 980 eV. When this beam hits the slit at normal incidence, at what angle will the first minimum of the electron diffraction pattern occur? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J) A) 0.095 mrad B) 0.071 mrad C) 0.046 mrad D) 0.12 mrad E) 0.14 mrad
Denmark is the world leader in installed percentage of renewable energy
What will be an ideal response?