A hot air balloon pilot wants the balloon to quickly rise several feet higher so it will be above some trees in the distance. Which best explains how the pilot can make the balloon rise? The pilot can adjust the temperature inside the balloon so it is equal to the temperature of the surrounding air.
The pilot can adjust the density of the air inside the balloon so it is equal to the density of the surrounding air.
The pilot can decrease the temperature inside the balloon so it is cooler than the surrounding air.
The pilot can increase the temperature inside the balloon so it is warmer than the surrounding air.

temperature inside the balloon so it is warmer than the surrounding air

Explanation:

For the balloon to get an uplift , it should be lighter than air . That means the density of the gas inside should be less than the density of air outside . only then ,  weight of the balloon plus the weight of the air inside balloon  will become less than the weight of displaced air outside . This can be achieved by warming up the air inside. Its temperature must exceed that of outside air.

we need to know the time interval during which the force acts. impulse of force = momentum change

the journeys of marquette, joliet and la salle a) new france expand.

all three of these explorers explored the midwest and the area around the great lakes, which they subsequently claimed for france.

this was a big portion of territory and expanded new france which before then only consisted of quebec province in northeastern canada