Time Dilation: Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year). Relative to a frame of reference that is fixed with respect to Earth, how long does it take Rob to complete the trip?
A. 14.4 years
B. 15.0 years
C. 10.8 years
D. 4.20 years
E. 22.7 years
Answer: B
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Answer the following statement true (T) or false (F)
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Atoms of nonmetallic elements form covalent bonds, but they can also form ionic bonds. How is this possible?
A) This happens when one of the bonded nonmetallic elements has a strong electronegativity. B) It happens when one of the nonmetallic elements loses an electron to become a positive ion. C) An ionic bond results when a nonmetallic elements loses an electron to a metallic element. D) An ionic bond results when a nonmetallic elements gains an electron from a metallic element.
What form of convection causes the offshore sea breeze in the evening?
A. natural convection of air falling over the cooling land B. forced convection air or force convection of water C. forced convection of water D. natural convection of air rising over the warming land