PHYS 2101 Lecture : Lecture2 2110
Document Summary
Please make sure to sign up for wileyplus. Deadline for initial assessment test is next friday. Today finish units (mass, density), begin 1-dimensional motion. Reasoning strategy: converting between units: in all calculations, write down the units explicitly, treat all units as algebraic quantities. Let"s say a mouse"s top speed is 7. 0 mi/hr, and i want to calculate its speed in m/s. Thus, i need to convert mi to m and h to s. 2. 54 cm 1 m 1 h 1 min. We only know the mouse"s top speed, 7. 0 mi/h, to an accuracy of 2 significant digits. In general, when numbers are multiplied or divided, the number of significant digits in the answer should be equal to the smallest number of significant digits in any of the original factors. Paris, france, has the standard mass of 1 kg. Another unit of mass is used for atomic mass measurements.
