Now that we’ve seen that the change in the momentum of the cart-disk system is a decrease of just a few percent, let’s compare the kinetic energy before and after the collision as well. Calculate the percent change in kinetic energy of the cart-disk system resulting from the collision. Express your answer as a positive or negative percentage to three significant figures, to indicate either an increase or decrease in kinetic energy.

Phase changes are chemical changes. true or false

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

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