What is the resultant of a horizontal 4-unit vector combined with a horizontal 3-unit vector?
A. 1 unit.
B. 7 units.
C. more than 7 units.
D. 5 units.
Answer: B
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Indicate whether this statement is true or false
A tsunami breached the 40-foot seawall at the Daiichi nuclear power plant in Honshu, Japan in 2011. What was the disastrous result?
A) a leak of radioactivity from the power plant B) a nuclear explosion C) thermal pollution D) a tidal wave that washed away buildings along the shore
The depth beneath the surface of the ocean below which passing waves do not disturb the water
column is called:a. thermocline. b. wave base. c. fetch. d. wave depth. e. the ocean floor
How much energy, in kilojoules, is released or absorbed from the reaction of one mole of nitrogen, N2, with three moles of molecular hydrogen, H2, to form two moles of ammonia, NH3? H-N (bond energy: 389 kJ/mol)H-H (bond energy: 436 kJ/mol)N 
N (bond energy: 946 kJ/mol) N N + H-H + H-H ? NH3 + NH3
A. ?80 kJ/mol released B. +80 kJ/mol absorbed C. +899 kJ/mol absorbed D. ?993 kJ/mol released