biology

Pac-car II

Pac-car II is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Pac-car II rather than just read about it. In short: Pac-Car II was developed as a student project at ETH Zürich (Swiss Federal Institute of Technology). Based on a group of students and an experienced team leader, the goal was to build a vehicle that uses as little fuel as possible.

Key takeaways

Pac-car II belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Pac-car II to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pac-car II from memory before moving on to harder problems.

Reference excerpt

Pac-Car II was developed as a student project at ETH Zürich (Swiss Federal Institute of Technology). Based on a group of students and an experienced team leader, the goal was to build a vehicle that uses as little fuel as possible. By using hydrogen fuel-cell, developed at ETH/PSI (Paul Scherrer Institute), as power source, pure water is the car's only emission. Clean mobility completed therefore the educational and energy saving aspects of the project.

Features Aerodynamic (drag coefficient of Cd=0.075, Af=0.254 m²) A lightweight body (total mass of 29 kg, carbon fibre materials) Low rolling resistance of Michelin's Radial Tyres (Cr=0.0008) Efficient powertrain (almost 50%) Use of simulation and optimization tools (CFD, FEM, MATLAB and Simulink, GESOP)

World record In 2005 on June 26, the PAC-Car II set a new world record in fuel-economy of 5385 km/L gasoline equivalence during the Shell Eco-Marathon in Ladoux, France. During its third race over 20.6 km the car consumed approximately 1 g of Hydrogen driving at an average speed of 30 km/h (roughly 18.6 mph). This corresponds to 0.0186 L/100 km (15,200 mpg‑imp; 12,600 mpg‑US) gasoline equivalence. This record is certified by the Guinness Book of World Records.

References

External links Pac-Car II Website

Illustrations

Worked examples

Example 1 — a first encounter with Pac-car II

Start with the simplest possible case. Write down what Pac-car II claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Pac-car II before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Pac-car II ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Pac-car II

In research: Pac-car II appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Pac-car II in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Pac-car II is common in secondary-school and first-year university syllabi. It links to neighbouring topics Concept cars, Fuel cell vehicles, Shell Eco-marathon challengers, so understanding it makes those chapters shorter.
In everyday life: Look for Pac-car II outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Pac-car II in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pac-car II means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Pac-car II out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pac-car II in simple terms?

Why does Pac-car II matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Pac-car II?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Pac-car II.