Question 19 of 20 A driver speeds along a level race track, then takes her foot off the gas pedal. Why does the car eventually come to a stop? 0 A. The car's kinetic energy is transformed into thermal energy by friction, B. The car's kinetic energy is transformed into gravitational potential energy. O c. The car's kinetic energy is eventually used up. O D. The car's kinetic energy is transformed back into chemical potential energy that is stored in the fuel.​

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Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n