When you view the pendulums swing, it shows that at the very top of the swing KE=0.what does that tell you about the pendulums motion at that point

In the first law of thermodynamics, triangle e=q-w, what does q stand for

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.

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