Answer:
One is tension force that acts on the string and the other one is gravitational force that is acting on the pen and is therefore, the one that pulls the pen towards the ground. Therefore, the pen's motion is caused by the unbalanced force acting on the pen.
The Equator is where the doldrums are found.
An ice cube when you heat it it can to water and water is liquid of course
It rises. it can steam before an after boiling point.
this equation is balanced.