23. A board for a shelf is 2.31 m long and 33.4 cm wide. to. What is the area of ​​the shelf in square meters? b. What is the perimeter of the shelf in centimeters? c. Which will reduce the area of ​​the shelf more: (1) cutting 3.4 cm from its width, or (2) cutting 0.31 m from its length?

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r