The Sun is a fairly normal star
Indicate whether the statement is true or false
TRUE
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Kepler made a major break from ancient beliefs when he
A) decided to look for a system that could explain actual observations B) realized that gravity holds the planets in their orbits C) abandoned circular orbits in favor of elliptical orbits
Why are optical fibers important for communication?
a. They can carry thousands of times the information that wires can. b. Light goes faster than electricity. c. They carry digital information. Wires can't carry digital information. d. all of the above
Silicon is FCC with an atom at 0,0,0 and an atom at 1/4,1/4,1/4 and a lattice parameter of 0.543 nm.
(a) How many atoms are there in this FCC unit cell? (b) Calculate the number of atoms per unit volume based upon the unit cell. (c) Calculate the number of atoms per unit volume based upon the density of 2.33 × 103 kg/m3.
An object has a volume of 4.0 m3 and weighs 40,000 N. What will its apparent weight be in water of density 1000 kg/m3?
A) 40,000 N B) 39,200 N C) 9,800 N D) 800 N