Aresearcher measures the value of the acceleration due to gravity several times and obtains the following results (all in m/s? units): 9.95, 10.10,9.97,9.99, and 10.02 the accepted value for the acceleration due to gravity on earth is 9.81 m/s? questions 1. determine the uncertainty range for this set of data, using any calculation tool at your disposal. record the uncertainty range here with appropriate significant figures and units as discussed in the above pages

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.