Which of the following is true concerning kinetic-molecular theory and heat transfer between relatively hotter object a and relatively colder object b? a. molecules of object a collide with those of object b, and the molecules in object b move faster. b. molecules of object a collide with those of object b, and the molecules in object b move at the same speed. c. molecules of object b collide with those of object a, and the molecules in object a move faster. d. molecules of object b collide with those of object a, and the molecules in object b move slower.

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?