Car batteries are rated by the following two numbers: (1) cranking amps=current the battery can produce for 30.0 seconds while maintaining a terminal voltage of at least 7.2 v and (2) reserve capacity=number of minutes the battery can produce a 25-a current while maintaining a terminal voltage of at least 10.5 v. one particular battery is advertised as having 905 cranking amps and a 155-minute reserve capacity. part a which of these two ratings represents the greater amount of energy delivered by the battery?

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