#11,12,15 and 17 please. Write in sentence with details

Express your answers to problems in this section to the correct number of significant figures and proper units. 11. Suppose that your bathroom scale reads your mass as 65 kg with a 3% uncertainty. What is the uncertainty in your mass (in kilograms)? 12. A good-quality measuring tape can be off by 0.50 cm over a distance of 20 m. What is its percent uncertainty? 13. (a) A car speedometer has a 5.0% uncertainty. What is the range of possible speeds when it reads 90 km/h ? (b) Convert this range to miles per hour. (1 km = 0.6214 mi) 14. An infant's pulse rate is measured to be 130 + 5 beats/ min. What is the percent uncertainty in this measurement? 15. (a) Suppose that a person has an average heart rate of 72.0 beats/min. How many beats does he or she have in 2.0 y? (b) In 2.00 y? (c) In 2.000 y? 16. A can contains 375 mL of soda. How much is left after 308 mL is removed? 17. State how many significant figures are proper in the results of the following calculations: (a)