The element lithium has two common isotopes: Li–6 and Li–7 If the average atomic mass of lithium is 6.94004 u, determine its percent isotopic abundances. Step by step and explain.

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg