A car has a kinetic energy of 1.9 × 103 joules. If the velocity of the car is decreased by half, what is its kinetic energy? A. 2.2 × 10^2 joules B. 4.7 × 10^2 joules C. 5.2 × 10^2 joules D. 5.8 × 10^3 joules

Hydrogen and helium are both members of?

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created