Where is the newest material in the Earth's crust found?
What will be an ideal response?
At the mid-ocean ridges, where plate tectonics constantly extrudes new lava.
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A 500-W device is connected to a 120-V ac power source. What is the peak voltage across this device?
A) 4.2 V B) 5.9 V C) 120 V D) 150 A E) 170 V
A point charge of 3.00 ?C is located on the y-axis at y = 4.0 m, another point charge of 6.0 ?C is located on the x-axis at x = 5.0 m, and a third charge of 7.2 ?C is located at (5.0 m, 4.0 m). What is the magnitude of the force on the 7.2 ?C charge?
A. 
B. 
C. 
D. 
E. 
In science, an unexpected change in a series of measurements is referred to as
A) a deviation B) bias C) an error D) an uncertainty
A sharp knife can more easily cut objects than can a dull knife because
A. sharp knives have edges that can fit between the molecules of the object. B. a greater force can be applied with a sharp knife. C. dull knives cannot apply large forces. D. a greater pressure can be applied with a sharp knife.