The concept of hydrostatic equilibrium is critical to understanding how the Sun has remained stable long enough for life to evolve here
Indicate whether the statement is true or false
TRUE
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Optical SETI is useful for
A) focused communication over short distances and in particular directions B) communication over wide areas and large distances C) communication over large distances in directions where interstellar dust is not present D) communication with civilizations which surround similar stars to our Sun and hence have evolved to see visible radiation
Find the frequency of X-rays of wavelength 1 Å = 10?10 m
a. 3 × 10^18 Hz b. 3 × 10^10 MHz c. 6 × 10^9 Hz d. 3 × 10^8 Hz e. 3 × 10^20 Hz
What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?
A) reflection B) refraction C) polarization D) dispersion E) interference
A 70-kg stunt artist rides in a rocket sled which slides along a flat inclined surface. At an instant when the sled's acceleration has a horizontal component of 6.0 m/s2 and a downward component of 2.8 m/s2, what is the magnitude of the force on the rider by the sled?
a. 0.83 kN b. 0.98 kN c. 0.65 kN d. 0.68 kN e. 0.72 kN