You just do the calculations.
The answer to fill in the blank in the question above is "make sure that your phone is a hands-free system" based on the paragraph' content<span>. A hands-free system means that a person does not have to use his/her hand for operating the system. A person must use this system if he/she is in the driving situation to avoid a distraction to his/her focus.</span>
The correct answer is physical weathering, also known as mechanical weathering. An example of this would be when water falls into the cracks of a rock. It freezes during cold times and expands in size, which causes the rock to crack even more. When it melts, the crack is bigger and new water goes inside and cracks it even more, and so on and so forth.
The centripetal acceleration is given by:
a = 4π²R/T²
Using this formula,
47.82T² = 4π² x (0.76/2)
T = 0.56 s
The answer is B.
Average oceanic crust thickness = (3+6)/2 = 4.5 mi
Average continental crust thickness = (20+30)/2 = 25 mi
Average Earth's crust thickness = (4.5+25)/2 = 14.75 mi
