Barometer for altitude in Drone Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Calculate altitude from pressure reading

Given the barometric pressure reading in Pascals, what is the altitude in meters calculated by the formula?

Altitude = 44330 * (1 - (pressure / 101325)^(1/5.255))

What is the output of this code snippet?

Drone Programming

pressure = 90000
altitude = 44330 * (1 - (pressure / 101325) ** (1/5.255))
print(round(altitude))

A 1000

B 1115

C 900

D 1200

💡 Hint

Use the formula carefully and round the result to the nearest integer.

The formula calculates altitude based on pressure ratio raised to the power 1/5.255. Plugging 90000 Pa gives approximately 1115 meters.

🧠 Conceptual

intermediate

Understanding barometer altitude calculation assumptions

Which assumption is NOT true when using a barometer to calculate altitude from pressure?

A Temperature is constant in the air column

B Pressure decreases exponentially with altitude

C Humidity has no effect on pressure readings

D Sea level pressure is known and constant

💡 Hint

Think about what environmental factors affect air pressure.

Humidity affects air density and pressure readings, so assuming it has no effect is incorrect.

🔧 Debug

advanced

Fix the altitude calculation code with wrong operator

This code is intended to calculate altitude from pressure but produces a wrong result. What is the error?

Drone Programming

pressure = 85000
altitude = 44330 * (1 - pressure / 101325) ** (1/5.255)
print(round(altitude))

A The pressure value is too low, causing negative altitude

B The print statement is missing parentheses

C The formula uses addition instead of subtraction

D The exponentiation applies only to the division, not the whole expression; parentheses are missing

💡 Hint

Check operator precedence and grouping in the formula.

Without parentheses around (pressure / 101325), the exponent applies only to the division, not the entire term inside the parentheses, causing wrong altitude.

📝 Syntax

advanced

Identify the syntax error in altitude calculation snippet

Which option contains a syntax error that prevents the altitude calculation code from running?

Drone Programming

pressure = 95000
altitude = 44330 * (1 - (pressure / 101325) ** (1/5.255))
print(round(altitude))

A altitude = 44330 * (1 - (pressure / 101325) ** 1/5.255)

B altitude = 44330 * (1 - (pressure / 101325) ** (1/5.255))

C ))552.5/1( ** )523101 / erusserp( - 1( * 03344 = edutitla

D altitude = 44330 * (1 - (pressure / 101325) ** (1//5.255))

💡 Hint

Look carefully at operator precedence and parentheses.

Option A lacks parentheses around the exponent, so ** has higher precedence than /, causing a wrong calculation (not a syntax error).

🚀 Application

expert

Calculate altitude difference from two pressure readings

You have two pressure readings from a drone's barometer at two different points:
Pressure1 = 101325 Pa (sea level)
Pressure2 = 90000 Pa (higher altitude)

Using the formula:
Altitude = 44330 * (1 - (pressure / 101325)^(1/5.255))

What is the altitude difference between the two points?

A 1115 meters

B 0 meters

C 900 meters

D 1500 meters

💡 Hint

Calculate altitude for each pressure then subtract.

Altitude at sea level is 0. Altitude at 90000 Pa is about 1115 meters. Difference is 1115 meters.