The following graph shows the rates of decay for four parent isotopes. based on the graph, which parent isotope most likely has a half-life of 13 billion years?
a
b
c
d

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final