(Choose all that apply.) Observatories on mountaintops can detect
A) visible light.
B) x-rays.
C) a small portion of the infrared spectrum.
D) very-long-wavelength infrared light.
E) radio waves.
A) visible light.
C) a small portion of the infrared spectrum.
E) radio waves.
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Which one of the following mineral groups exhibits a sheet-like silicate structure?
pyroxenes feldspars carbonates micas
When a nucleus in an excited state decays to the ground state, a beta particle is emitted
a. True b. False Indicate whether the statement is true or false
Each choice describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)
A) Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. B) Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month. C) Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year. D) Earth's rotation defines a day. The Saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years.
A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass of the man-board system?
A) 1.25 m B) 2.50 m C) 5.00 m D) 7.50 m E) 9.00 m