Some Seyfert nuclei emit more energy than the energy emitted by the entire Milky Way Galaxy
Indicate whether the statement is true or false
True
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A length of piano wire is used to hang a mass from the ceiling. If the total mass of the string is 0.72 g and the mass hung from it is 1850 g, what is the length of the wire, assuming the fundamental frequency when plucked in these circumstances is 1280 Hz?
A. 2.48 cm B. 6.15 cm C. 3.08 cm D. 1.54 cm
The volume of a sphere is 8.00 m3 . The radius of the sphere is
A. 1.24 m. B. 2.00 m. C. 2.65 m. D. 3.00 m.
Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20)
This fact relates to the organization of the periodic table in that strontium and calcium are both A) metals. B) in group 2 of the periodic table. C) made of relatively large atoms. D) soluble in water.
An electron has a kinetic energy that is twice its rest energy. Determine its speed
a. 0.76c b. 0.81c c. 0.94c d. 0.54c e. 0.87c