## Why do we use helium instead of hydrogen in balloons?

Helium is used to fill balloons rather than hydrogen, as helium is comparatively lighter than hydrogen and would make balloons fly higher and easier.

### Why dont we fill balloons with hydrogen?

While hydrogen is less dense than helium, it’s not particularly the “safest” option to fill balloons with. That’s because hydrogen is flammable. Helium is monatomic (He), meaning the atoms are not bonded to each other to form a compound.

#### How is hydrogen used in hot air balloons?

In the United States, pilots fly with helium or hydrogen as the lifting gas. Both gases are lighter than air. Gas balloons get their initial lift from the helium or hydrogen pumped into their envelopes.

**Can hydrogen be used to fill balloons?**

Hydrogen is another gas lighter than air; it’s even lighter than helium. Hydrogen, however, is not used in balloons and this demonstration shows why. Helium is a special gas called a Noble Gas, which means it doesn’t burn. When a match is held near a helium-filled balloon, the balloon pops.

**Who made the first hot air balloon?**

Montgolfier brothers

## What is the height of the balloon after 1 second?

24.5 m high

### What is the height of the balloon after 30 seconds?

%3D What is the height of the balloon after 30 seconds? 60 ft.

#### What is the maximum height in feet the balloon will reach?

While no one can ever guarantee a weather balloon will soar to a specific height, the balloons typically reach between 60,000 and 105,000 feet. However, the highest recorded weather balloon flight on record was launched in 2002 and soared to an incredible height of 173,000 feet.

**How long will it take the rocket to hit its maximum height?**

The maximum height is 144 feet because the y-coordinate of the turning point is 144. It will take 1 second to first rise to a height of 128 feet. However, 2 seconds later (3 seconds after the launch), it will fall to a height of 128 ft once more.

**What is the maximum height your feet will be above the ground?**

2.25 feet

## How many seconds will the rocket be 112 feet above the ground?

Answer: The rocket will take 9.25 seconds to return to ground .

### How do you find maximum height?

How to find the maximum height of a projectile?

- if α = 90°, then the formula simplifies to: hmax = h + V₀² / (2 * g) and the time of flight is the longest.
- if α = 45°, then the equation may be written as:
- if α = 0°, then vertical velocity is equal to 0 (Vy = 0), and that’s the case of horizontal projectile motion.