What are similarities and differences between a falling object and a pendulum?

Ineed with a, b, c, d, and e on the long answer

How many moles are in 7.2 x 10^23 carbon molecules?

What is the temperature in kelvin of a gas if it is allowed to expand from 1.50 l to 4.50 l? the initial temperature is 10.0°c and pressure is constant throughout the change. which equation should you use? t2= v2/v1 t1 what is the final temperature? ⇒ 849 k these are the answers.