_l. A car drives around a corner in a radius of lo mi Passengers experience a centripetal acceleration of\") mfsz. What is the car's speed expressed in kilometres per hour? a. 42 d. 12 b. 32 e. 2 c. 22 . A rock is tied to the end of a string and whirled around in a circle that describes a vertical plane At which position is the tension in the string the least? a. at the top of the circle b. at the bottom of the circle c. on the ascending side ofthc circle d. on the descending side of the circle e. The tension in the string is the same at all places on the circle. 3. Assume the objects in the following diagrams have equal mass and the strings holding them in place are identical. In which case would the string be most likely to break? In all cases, the string is attached at two ends to the ceiling, and the hanger is hung [ not tied}. r _ D. All would be J B Y equallylikelyto break l\" 3 _ 4' The orbital radius ofa satellite circling the Earth a. depends only on its mass and orbital Speed b. depends only on its mass e. depends on its orbital speed d. is the same for all satellites e. is directly proportional to its orbital speed