5 factors that explain why achieving gender equality is important for contemporary African studies ​

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.