Unit Conversion and Significant Figures Practice: Mechanics for Students!

An ore loader moves 1,200 tons/h from a mine to the surface. Convert this rate to pounds per second, using 1 ton = 2,000 lb. How many significant figures are in the following numbers? (a) 78.9 +/- 0.2 (b) 3.788 · 10 -9 (c) 2.46 · 10 -6 (d) 0.0053 The tropical year, the time interval from one vernal equinox to the next vernal equinox, is the basis for our calendar. It contains 365.242199 days. Find the number of seconds in a tropical year. I hope this helps! If you have any recommendations for future problems, or have suggestion for tutorials in the future, feel free to leave a comment!