science

Progress 20

Progress 20 is a science 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 Progress 20 rather than just read about it. In short: Progress 20 (Russian: Прогресс 20) was a Soviet uncrewed Progress cargo spacecraft, which was launched in April 1984 to resupply the Salyut 7 space station. Spacecraft Progress 20 was a Progress 7K-TG spacecraft.

Key takeaways

Progress 20 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Progress 20 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Progress 20 from memory before moving on to harder problems.

Reference excerpt

Progress 20 (Russian: Прогресс 20) was a Soviet uncrewed Progress cargo spacecraft, which was launched in April 1984 to resupply the Salyut 7 space station.

Spacecraft Progress 20 was a Progress 7K-TG spacecraft. The 20th of forty three to be launched, it had the serial number 121. The Progress 7K-TG spacecraft was the first generation Progress, derived from the Soyuz 7K-T and intended for uncrewed logistics missions to space stations in support of the Salyut programme. On some missions the spacecraft were also used to adjust the orbit of the space station. The Progress spacecraft had a dry mass of 6,520 kilograms (14,370 lb), which increased to around 7,020 kilograms (15,480 lb) when fully fuelled. It measured 7.48 metres (24.5 ft) in length, and 2.72 metres (8 ft 11 in) in diameter. Each spacecraft could accommodate up to 2,500 kilograms (5,500 lb) of payload, consisting of dry cargo and propellant. The spacecraft were powered by chemical batteries, and could operate in free flight for up to three days, remaining docked to the station for up to thirty.

Launch Progress 20 launched on 15 April 1984 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U2 rocket.

Docking Progress 20 docked with the aft port of Salyut 7 on 17 April 1984 at 09:22 UTC, and was undocked on 6 May 1984 at 17:46 UTC.

Decay It remained in orbit until 7 May 1984, when it was deorbited. The deorbit burn occurred at 00:32:51 UTC, with the mission ending at around 01:15 UTC.

Illustrations

Worked examples

Example 1 — a first encounter with Progress 20

Start with the simplest possible case. Write down what Progress 20 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Progress 20 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 Progress 20 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 Progress 20

In research: Progress 20 appears in science 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 Progress 20 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: Progress 20 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1984 in the Soviet Union, Progress (spacecraft) missions, Soviet spacecraft stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Progress 20 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 Progress 20 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Progress 20 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 Progress 20 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Progress 20 in simple terms?

Progress 20 (Russian: Прогресс 20) was a Soviet uncrewed Progress cargo spacecraft, which was launched in April 1984 to resupply the Salyut 7 space station. Spacecraft Progress 20 was a Progress 7K-TG spacecraft.

Why does Progress 20 matter?

Because it connects several science 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 Progress 20?

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 Progress 20.