Arocket with its thruster on is speeding up towards the moon. therefore, what type of force is acting on the rocket? a. zero net force b. frictional force c. balanced force d. unbalanced force

Explanation:

If a rocket is at rest or moving at a constant velocity, the forces on it are balanced.

If the engines are ignited in flight, the thrust from the propellant gases unbalances the forces, and the rocket speeds up.

A is wrong. There can't be zero net force if the rocket is accelerating.

B is wrong. There is no friction in space.

C is wrong. The forces can't be balanced if the rocket is accelerating.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.