In each case, you should demonstrate how you worked out your answer, as well as giving the answer.
you must show your working to gain full marks. in each case, about 50% of the marks are awarded for a clear explanation of your working.
a. a sinewave has a period (duration of one cycle) of 6.5ms. what is its corresponding frequency expressed to 3 significant figures?
if the frequency of this sinewave is increased by a factor of 3, calculate the new period value, expressing your answer again to 3 significant figures. clearly, show all your working.

Aflask with vinegar in it has a mass of 160 grams. a balloon with baking soda in it has a mass of 40 grams. the balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. the balloon inflates to a large volume. what will the total mass of the balloon and flask be after the balloon inflates? explain. a) less than 200 grams because the solid baking soda disappears. b) 200 grams, because all the atoms remain in the balloon or flask. c) more than 200 grams because the size of the balloon is so much larger. d) less than 200 grams because gases such as the one in the balloon are lighter than solids and liquids.